Re: [PATCH v2 6/6] drm/vs: Add hdmi driver

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On 2023/10/26 6:23, Dmitry Baryshkov wrote:
> On 25/10/2023 13:39, Keith Zhao wrote:
>> add hdmi driver as encoder and connect
>>
>> Signed-off-by: Keith Zhao <keith.zhao@xxxxxxxxxxxxxxxx>
>> ---
>>   drivers/gpu/drm/verisilicon/Kconfig         |   8 +-
>>   drivers/gpu/drm/verisilicon/Makefile        |   1 +
>>   drivers/gpu/drm/verisilicon/starfive_hdmi.c | 949 ++++++++++++++++++++
>>   drivers/gpu/drm/verisilicon/starfive_hdmi.h | 295 ++++++
>>   drivers/gpu/drm/verisilicon/vs_drv.c        |   5 +
>>   drivers/gpu/drm/verisilicon/vs_drv.h        |   4 +
>>   6 files changed, 1261 insertions(+), 1 deletion(-)
>>   create mode 100644 drivers/gpu/drm/verisilicon/starfive_hdmi.c
>>   create mode 100644 drivers/gpu/drm/verisilicon/starfive_hdmi.h
>>
>> diff --git a/drivers/gpu/drm/verisilicon/Kconfig b/drivers/gpu/drm/verisilicon/Kconfig
>> index 3a361f8c8..122c786e3 100644
>> --- a/drivers/gpu/drm/verisilicon/Kconfig
>> +++ b/drivers/gpu/drm/verisilicon/Kconfig
>> @@ -12,4 +12,10 @@ config DRM_VERISILICON
>>         setting and buffer management. It does not
>>         provide 2D or 3D acceleration.
>>   -
>> +config DRM_VERISILICON_STARFIVE_HDMI
>> +    bool "Starfive HDMI extensions"
>> +    depends on DRM_VERISILICON
>> +    help
>> +       This selects support for StarFive soc specific extensions
>> +       for the Innosilicon HDMI driver. If you want to enable
>> +       HDMI on JH7110 based soc, you should select this option.
>> diff --git a/drivers/gpu/drm/verisilicon/Makefile b/drivers/gpu/drm/verisilicon/Makefile
>> index 1d48016ca..08350f25b 100644
>> --- a/drivers/gpu/drm/verisilicon/Makefile
>> +++ b/drivers/gpu/drm/verisilicon/Makefile
>> @@ -7,5 +7,6 @@ vs_drm-objs := vs_dc_hw.o \
>>           vs_modeset.o \
>>           vs_plane.o
>>   +vs_drm-$(CONFIG_DRM_VERISILICON_STARFIVE_HDMI) += starfive_hdmi.o
>>   obj-$(CONFIG_DRM_VERISILICON) += vs_drm.o
>>   diff --git a/drivers/gpu/drm/verisilicon/starfive_hdmi.c b/drivers/gpu/drm/verisilicon/starfive_hdmi.c
>> new file mode 100644
>> index 000000000..d296c4b71
>> --- /dev/null
>> +++ b/drivers/gpu/drm/verisilicon/starfive_hdmi.c
>> @@ -0,0 +1,949 @@
>> +// SPDX-License-Identifier: GPL-2.0-only
>> +/*
>> + * Copyright (C) 2023 StarFive Technology Co., Ltd.
>> + */
>> +
>> +#include <linux/clk.h>
>> +#include <linux/component.h>
>> +#include <linux/delay.h>
>> +#include <linux/err.h>
>> +#include <linux/hdmi.h>
>> +#include <linux/i2c.h>
>> +#include <linux/irq.h>
>> +#include <linux/media-bus-format.h>
>> +#include <linux/mfd/syscon.h>
>> +#include <linux/module.h>
>> +#include <linux/mutex.h>
>> +#include <linux/of_device.h>
>> +#include <linux/pm_runtime.h>
>> +#include <linux/reset.h>
>> +
>> +#include <drm/bridge/dw_hdmi.h>
>> +#include <drm/drm_atomic_helper.h>
>> +#include <drm/drm_edid.h>
>> +#include <drm/drm_managed.h>
>> +#include <drm/drm_of.h>
>> +#include <drm/drm_probe_helper.h>
>> +#include <drm/drm_simple_kms_helper.h>
>> +
>> +#include "starfive_hdmi.h"
>> +#include "vs_drv.h"
>> +#include "vs_crtc.h"
>> +
>> +static struct starfive_hdmi *encoder_to_hdmi(struct drm_encoder *encoder)
>> +{
>> +    return container_of(encoder, struct starfive_hdmi, encoder);
>> +}
>> +
>> +static struct starfive_hdmi *connector_to_hdmi(struct drm_connector *connector)
>> +{
>> +    return container_of(connector, struct starfive_hdmi, connector);
>> +}
>> +
>> +struct starfive_hdmi_i2c {
>> +    struct i2c_adapter adap;
>> +
>> +    u8 ddc_addr;
>> +    u8 segment_addr;
>> +    /* protects the edid data when use i2c cmd to read edid */
>> +    struct mutex lock;
>> +    struct completion cmp;
>> +};
>> +
>> +static const struct pre_pll_config pre_pll_cfg_table[] = {
>> +    { 25175000,  25175000, 1,  100, 2, 3, 3, 12, 3, 3, 4, 0, 0xf55555},
>> +    { 25200000,  25200000, 1,  100, 2, 3, 3, 12, 3, 3, 4, 0, 0},
>> +    { 27000000,  27000000, 1,  90, 3, 2, 2, 10, 3, 3, 4, 0, 0},
> 
> Such data structures are usually pretyt limited and hard to handle. Could you please replace it with the runtime calculations of
> 
>> +    { 27027000,  27027000, 1,  90, 3, 2, 2, 10, 3, 3, 4, 0, 0x170a3d},
>> +    { 28320000,  28320000, 1,  28, 2, 1, 1,  3, 0, 3, 4, 0, 0x51eb85},
>> +    { 30240000,  30240000, 1,  30, 2, 1, 1,  3, 0, 3, 4, 0, 0x3d70a3},
>> +    { 31500000,  31500000, 1,  31, 2, 1, 1,  3, 0, 3, 4, 0, 0x7fffff},
>> +    { 33750000,  33750000, 1,  33, 2, 1, 1,  3, 0, 3, 4, 0, 0xcfffff},
>> +    { 36000000,  36000000, 1,  36, 2, 1, 1,  3, 0, 3, 4, 0, 0},
>> +    { 40000000,  40000000, 1,  80, 2, 2, 2, 12, 2, 2, 2, 0, 0},
>> +    { 46970000,  46970000, 1,  46, 2, 1, 1,  3, 0, 3, 4, 0, 0xf851eb},
>> +    { 49500000,  49500000, 1,  49, 2, 1, 1,  3, 0, 3, 4, 0, 0x7fffff},
>> +    { 49000000,  49000000, 1,  49, 2, 1, 1,  3, 0, 3, 4, 0, 0},
>> +    { 50000000,  50000000, 1,  50, 2, 1, 1,  3, 0, 3, 4, 0, 0},
>> +    { 54000000,  54000000, 1,  54, 2, 1, 1,  3, 0, 3, 4, 0, 0},
>> +    { 54054000,  54054000, 1,  54, 2, 1, 1,  3, 0, 3, 4, 0, 0x0dd2f1},
>> +    { 57284000,  57284000, 1,  57, 2, 1, 1,  3, 0, 3, 4, 0, 0x48b439},
>> +    { 58230000,  58230000, 1,  58, 2, 1, 1,  3, 0, 3, 4, 0, 0x3ae147},
>> +    { 59341000,  59341000, 1,  59, 2, 1, 1,  3, 0, 3, 4, 0, 0x574bc6},
>> +    { 59400000,  59400000, 1,  99, 3, 1, 1,  1, 3, 3, 4, 0, 0},
>> +    { 65000000,  65000000, 1, 130, 2, 2, 2,  12, 0, 2, 2, 0, 0},
>> +    { 68250000,  68250000, 1, 68,  2, 1, 1,  3,  0, 3, 4, 0, 0x3fffff},
>> +    { 71000000,  71000000, 1,  71, 2, 1, 1,  3, 0, 3,  4, 0, 0},
>> +    { 74176000,  74176000, 1,  98, 1, 2, 2,  1, 2, 3, 4, 0, 0xe6ae6b},
>> +    { 74250000,  74250000, 1,  99, 1, 2, 2,  1, 2, 3, 4, 0, 0},
>> +    { 75000000,  75000000, 1,  75, 2, 1, 1,  3, 0, 3, 4, 0, 0},
>> +    { 78750000,  78750000, 1,  78, 2, 1, 1,  3, 0, 3, 4, 0, 0xcfffff},
>> +    { 79500000,  79500000, 1,  79, 2, 1, 1,  3, 0, 3, 4, 0, 0x7fffff},
>> +    { 83500000,  83500000, 2, 167, 2, 1, 1,  1, 0, 0,  6, 0, 0},
>> +    { 83500000, 104375000, 1, 104, 2, 1, 1,  1, 1, 0,  5, 0, 0x600000},
>> +    { 84858000,  84858000, 1,  85, 2, 1, 1,  3, 0, 3,  4, 0, 0xdba5e2},
>> +    { 85500000,  85500000, 1,  85, 2, 1, 1,  3, 0, 3,  4, 0, 0x7fffff},
>> +    { 85750000,  85750000, 1,  85, 2, 1, 1,  3, 0, 3,  4, 0, 0xcfffff},
>> +    { 85800000,  85800000, 1,  85, 2, 1, 1,  3, 0, 3,  4, 0, 0xcccccc},
>> +    { 88750000,  88750000, 1,  88, 2, 1, 1,  3, 0, 3,  4, 0, 0xcfffff},
>> +    { 89910000,  89910000, 1,  89, 2, 1, 1,  3, 0, 3, 4, 0, 0xe8f5c1},
>> +    { 90000000,  90000000, 1,  90, 2, 1, 1,  3, 0, 3, 4, 0, 0},
>> +    {101000000, 101000000, 1, 101, 2, 1, 1,  3, 0, 3, 4, 0, 0},
>> +    {102250000, 102250000, 1, 102, 2, 1, 1,  3, 0, 3, 4, 0, 0x3fffff},
>> +    {106500000, 106500000, 1, 106, 2, 1, 1,  3, 0, 3, 4, 0, 0x7fffff},
>> +    {108000000, 108000000, 1,  90, 3, 0, 0,  5, 0, 2,  2, 0, 0},
>> +    {119000000, 119000000, 1, 119, 2, 1, 1,  3, 0, 3,  4, 0, 0},
>> +    {131481000, 131481000, 1,  131, 2, 1, 1,  3, 0, 3,  4, 0, 0x7b22d1},
>> +    {135000000, 135000000, 1,  135, 2, 1, 1,  3, 0, 3, 4, 0, 0},
>> +    {136750000, 136750000, 1,  136, 2, 1, 1,  3, 0, 3, 4, 0, 0xcfffff},
>> +    {147180000, 147180000, 1,  147, 2, 1, 1,  3, 0, 3, 4, 0, 0x2e147a},
>> +    {148352000, 148352000, 1,  98, 1, 1, 1,  1, 2, 2, 2, 0, 0xe6ae6b},
>> +    {148500000, 148500000, 1,  99, 1, 1, 1,  1, 2, 2, 2, 0, 0},
>> +    {154000000, 154000000, 1, 154, 2, 1, 1,  3, 0, 3, 4, 0, 0},
>> +    {156000000, 156000000, 1, 156, 2, 1, 1,  3, 0, 3, 4, 0, 0},
>> +    {157000000, 157000000, 1, 157, 2, 1, 1,  3, 0, 3, 4, 0, 0},
>> +    {162000000, 162000000, 1, 162, 2, 1, 1,  3, 0, 3, 4, 0, 0},
>> +    {174250000, 174250000, 1, 145, 3, 0, 0,  5, 0, 2, 2, 0, 0x355555},
>> +    {174500000, 174500000, 1, 174, 2, 1, 1,  3, 0, 3, 4, 0, 0x7fffff},
>> +    {174570000, 174570000, 1, 174, 2, 1, 1,  3, 0, 3, 4, 0, 0x91eb84},
>> +    {175500000, 175500000, 1, 175, 2, 1, 1,  3, 0, 3, 4, 0, 0x7fffff},
>> +    {185590000, 185590000, 1, 185, 2, 1, 1,  3, 0, 3, 4, 0, 0x970a3c},
>> +    {187000000, 187000000, 1, 187, 2, 1, 1,  3, 0, 3, 4, 0, 0},
>> +    {241500000, 241500000, 1, 161, 1, 1, 1,  4, 0, 2,  2, 0, 0},
>> +    {241700000, 241700000, 1, 241, 2, 1, 1,  3, 0, 3,  4, 0, 0xb33332},
>> +    {262750000, 262750000, 1, 262, 2, 1, 1,  3, 0, 3,  4, 0, 0xcfffff},
>> +    {296500000, 296500000, 1, 296, 2, 1, 1,  3, 0, 3,  4, 0, 0x7fffff},
>> +    {296703000, 296703000, 1,  98, 0, 1, 1,  1, 0, 2,  2, 0, 0xe6ae6b},
>> +    {297000000, 297000000, 1,  99, 0, 1, 1,  1, 0, 2,  2, 0, 0},
>> +    {594000000, 594000000, 1,  99, 0, 2, 0,  1, 0, 1,  1, 0, 0},
>> +    {0, 0, 0,  0, 0, 0, 0,  0, 0, 0,  0, 0, 0},
>> +};
>> +
>> +static const struct post_pll_config post_pll_cfg_table[] = {
>> +    {25200000,    1, 80, 13, 3, 1},
>> +    {27000000,    1, 40, 11, 3, 1},
>> +    {33750000,    1, 40, 11, 3, 1},
>> +    {49000000,    1, 20, 1, 3, 3},
>> +    {241700000, 1, 20, 1, 3, 3},
>> +    {297000000, 4, 20, 0, 0, 3},
>> +    {594000000, 4, 20, 0, 0, 0},
>> +    { /* sentinel */ }
>> +};
>> +
>> +inline u8 hdmi_readb(struct starfive_hdmi *hdmi, u16 offset)
>> +{
>> +    return readl_relaxed(hdmi->regs + (offset) * 0x04);
>> +}
>> +
>> +inline void hdmi_writeb(struct starfive_hdmi *hdmi, u16 offset, u32 val)
>> +{
>> +    writel_relaxed(val, hdmi->regs + (offset) * 0x04);
>> +}
>> +
>> +inline void hdmi_modb(struct starfive_hdmi *hdmi, u16 offset,
>> +                 u32 msk, u32 val)
>> +{
>> +    u8 temp = hdmi_readb(hdmi, offset) & ~msk;
>> +
>> +    temp |= val & msk;
>> +    hdmi_writeb(hdmi, offset, temp);
>> +}
>> +
>> +static int starfive_hdmi_enable_clk_deassert_rst(struct device *dev, struct starfive_hdmi *hdmi)
>> +{
>> +    int ret;
>> +
>> +    ret = clk_prepare_enable(hdmi->sys_clk);
>> +    if (ret) {
>> +        dev_err(dev, "Cannot enable HDMI sys clock: %d\n", ret);
>> +        return ret;
>> +    }
>> +
>> +    ret = clk_prepare_enable(hdmi->mclk);
>> +    if (ret) {
>> +        dev_err(dev, "Cannot enable HDMI mclk clock: %d\n", ret);
>> +        goto err_mclk;
>> +    }
>> +    ret = clk_prepare_enable(hdmi->bclk);
> 
> This code begs to use clk_bulk instead.
> 
>> +    if (ret) {
>> +        dev_err(dev, "Cannot enable HDMI bclk clock: %d\n", ret);
>> +        goto err_bclk;
>> +    }
>> +    ret = reset_control_deassert(hdmi->tx_rst);
>> +    if (ret < 0) {
>> +        dev_err(dev, "failed to deassert tx_rst\n");
>> +        goto err_rst;
>> +    }
>> +    return 0;
>> +
>> +err_rst:
>> +    clk_disable_unprepare(hdmi->bclk);
>> +err_bclk:
>> +    clk_disable_unprepare(hdmi->mclk);
>> +err_mclk:
>> +    clk_disable_unprepare(hdmi->sys_clk);
>> +    return ret;
>> +}
>> +
>> +static void starfive_hdmi_disable_clk_assert_rst(struct device *dev, struct starfive_hdmi *hdmi)
>> +{
>> +    int ret;
>> +
>> +    ret = reset_control_assert(hdmi->tx_rst);
>> +    if (ret < 0)
>> +        dev_err(dev, "failed to assert tx_rst\n");
>> +
>> +    clk_disable_unprepare(hdmi->sys_clk);
>> +    clk_disable_unprepare(hdmi->mclk);
>> +    clk_disable_unprepare(hdmi->bclk);
>> +}
>> +
>> +#ifdef CONFIG_PM_SLEEP
>> +static int hdmi_system_pm_suspend(struct device *dev)
>> +{
>> +    return pm_runtime_force_suspend(dev);
>> +}
>> +
>> +static int hdmi_system_pm_resume(struct device *dev)
>> +{
>> +    return pm_runtime_force_resume(dev);
>> +}
>> +#endif
>> +
>> +#ifdef CONFIG_PM
>> +static int hdmi_runtime_suspend(struct device *dev)
>> +{
>> +    struct starfive_hdmi *hdmi = dev_get_drvdata(dev);
>> +
>> +    starfive_hdmi_disable_clk_assert_rst(dev, hdmi);
>> +
>> +    return 0;
>> +}
>> +
>> +static int hdmi_runtime_resume(struct device *dev)
>> +{
>> +    struct starfive_hdmi *hdmi = dev_get_drvdata(dev);
>> +
>> +    return starfive_hdmi_enable_clk_deassert_rst(dev, hdmi);
>> +}
>> +#endif
>> +
>> +static void starfive_hdmi_tx_phy_power_down(struct starfive_hdmi *hdmi)
>> +{
>> +    hdmi_modb(hdmi, HDMI_SYS_CTRL, m_POWER, v_PWR_OFF);
>> +}
>> +
>> +static void starfive_hdmi_tx_phy_power_on(struct starfive_hdmi *hdmi)
>> +{
>> +    hdmi_modb(hdmi, HDMI_SYS_CTRL, m_POWER, v_PWR_ON);
> 
> It looks like one can inline these two helpers w/o too much troubles.
> 
>> +}
>> +
>> +static void starfive_hdmi_config_pll(struct starfive_hdmi *hdmi)
>> +{
>> +    u32 val;
>> +    u8 reg_1ad_value = hdmi->post_cfg->post_div_en ?
>> +         hdmi->post_cfg->postdiv : 0x00;
>> +    u8 reg_1aa_value = hdmi->post_cfg->post_div_en ?
>> +         0x0e : 0x02;
>> +
>> +    hdmi_writeb(hdmi, STARFIVE_PRE_PLL_CONTROL, STARFIVE_PRE_PLL_POWER_DOWN);
>> +    hdmi_writeb(hdmi, STARFIVE_POST_PLL_DIV_1,
>> +            STARFIVE_POST_PLL_POST_DIV_ENABLE |
>> +            STARFIVE_POST_PLL_REFCLK_SEL_TMDS |
>> +            STARFIVE_POST_PLL_POWER_DOWN);
>> +    hdmi_writeb(hdmi, STARFIVE_PRE_PLL_DIV_1, STARFIVE_PRE_PLL_PRE_DIV(hdmi->pre_cfg->prediv));
>> +
>> +    val = STARFIVE_SPREAD_SPECTRUM_MOD_DISABLE | STARFIVE_SPREAD_SPECTRUM_MOD_DOWN;
>> +    if (!hdmi->pre_cfg->fracdiv)
>> +        val |= STARFIVE_PRE_PLL_FRAC_DIV_DISABLE;
>> +    hdmi_writeb(hdmi, STARFIVE_PRE_PLL_DIV_2,
>> +            STARFIVE_PRE_PLL_FB_DIV_11_8(hdmi->pre_cfg->fbdiv) | val);
>> +    hdmi_writeb(hdmi, STARFIVE_PRE_PLL_DIV_3,
>> +            STARFIVE_PRE_PLL_FB_DIV_7_0(hdmi->pre_cfg->fbdiv));
>> +    hdmi_writeb(hdmi, STARFIVE_PRE_PLL_DIV_4,
>> +            STARFIVE_PRE_PLL_TMDSCLK_DIV_C(hdmi->pre_cfg->tmds_div_c) |
>> +            STARFIVE_PRE_PLL_TMDSCLK_DIV_A(hdmi->pre_cfg->tmds_div_a) |
>> +            STARFIVE_PRE_PLL_TMDSCLK_DIV_B(hdmi->pre_cfg->tmds_div_b));
>> +
>> +    if (hdmi->pre_cfg->fracdiv) {
>> +        hdmi_writeb(hdmi, STARFIVE_PRE_PLL_FRAC_DIV_L,
>> +                STARFIVE_PRE_PLL_FRAC_DIV_7_0(hdmi->pre_cfg->fracdiv));
>> +        hdmi_writeb(hdmi, STARFIVE_PRE_PLL_FRAC_DIV_M,
>> +                STARFIVE_PRE_PLL_FRAC_DIV_15_8(hdmi->pre_cfg->fracdiv));
>> +        hdmi_writeb(hdmi, STARFIVE_PRE_PLL_FRAC_DIV_H,
>> +                STARFIVE_PRE_PLL_FRAC_DIV_23_16(hdmi->pre_cfg->fracdiv));
>> +    }
>> +
>> +    hdmi_writeb(hdmi, STARFIVE_PRE_PLL_DIV_5,
>> +            STARFIVE_PRE_PLL_PCLK_DIV_A(hdmi->pre_cfg->pclk_div_a) |
>> +            STARFIVE_PRE_PLL_PCLK_DIV_B(hdmi->pre_cfg->pclk_div_b));
>> +    hdmi_writeb(hdmi, STARFIVE_PRE_PLL_DIV_6,
>> +            STARFIVE_PRE_PLL_PCLK_DIV_C(hdmi->pre_cfg->pclk_div_c) |
>> +            STARFIVE_PRE_PLL_PCLK_DIV_D(hdmi->pre_cfg->pclk_div_d));
>> +
>> +    /*pre-pll power down*/
>> +    hdmi_modb(hdmi, STARFIVE_PRE_PLL_CONTROL, STARFIVE_PRE_PLL_POWER_DOWN, 0);
>> +
>> +    hdmi_modb(hdmi, STARFIVE_POST_PLL_DIV_2, STARFIVE_POST_PLL_Pre_DIV_MASK,
>> +          STARFIVE_POST_PLL_PRE_DIV(hdmi->post_cfg->prediv));
>> +    hdmi_writeb(hdmi, STARFIVE_POST_PLL_DIV_3, hdmi->post_cfg->fbdiv & 0xff);
>> +    hdmi_writeb(hdmi, STARFIVE_POST_PLL_DIV_4, reg_1ad_value);
>> +    hdmi_writeb(hdmi, STARFIVE_POST_PLL_DIV_1, reg_1aa_value);
>> +}
>> +
>> +static void starfive_hdmi_tmds_driver_on(struct starfive_hdmi *hdmi)
>> +{
>> +    hdmi_modb(hdmi, STARFIVE_TMDS_CONTROL,
>> +          STARFIVE_TMDS_DRIVER_ENABLE, STARFIVE_TMDS_DRIVER_ENABLE);
>> +}
>> +
>> +static void starfive_hdmi_sync_tmds(struct starfive_hdmi *hdmi)
>> +{
>> +    /*first send 0 to this bit, then send 1 and keep 1 into this bit*/
>> +    hdmi_writeb(hdmi, HDMI_SYNC, 0x0);
>> +    hdmi_writeb(hdmi, HDMI_SYNC, 0x1);
>> +}
>> +
>> +static void starfive_hdmi_i2c_init(struct starfive_hdmi *hdmi)
>> +{
>> +    int ddc_bus_freq;
>> +
>> +    ddc_bus_freq = (clk_get_rate(hdmi->sys_clk) >> 2) / HDMI_SCL_RATE;
>> +
>> +    hdmi_writeb(hdmi, DDC_BUS_FREQ_L, ddc_bus_freq & 0xFF);
>> +    hdmi_writeb(hdmi, DDC_BUS_FREQ_H, (ddc_bus_freq >> 8) & 0xFF);
>> +
>> +    /* Clear the EDID interrupt flag and mute the interrupt */
>> +    hdmi_writeb(hdmi, HDMI_INTERRUPT_MASK1, 0);
>> +    hdmi_writeb(hdmi, HDMI_INTERRUPT_STATUS1, m_INT_EDID_READY);
>> +}
>> +
>> +static const
>> +struct pre_pll_config *starfive_hdmi_phy_get_pre_pll_cfg(struct starfive_hdmi *hdmi,
>> +                             unsigned long rate)
>> +{
>> +    const struct pre_pll_config *cfg = pre_pll_cfg_table;
>> +
>> +    rate = (rate / 1000) * 1000;
>> +    for (; cfg->pixclock != 0; cfg++)
>> +        if (cfg->tmdsclock == rate && cfg->pixclock == rate)
>> +            break;
>> +
>> +    if (cfg->pixclock == 0)
>> +        return ERR_PTR(-EINVAL);
>> +
>> +    return cfg;
>> +}
>> +
>> +static int starfive_hdmi_phy_clk_set_rate(struct starfive_hdmi *hdmi)
>> +{
>> +    hdmi->post_cfg = post_pll_cfg_table;
>> +
>> +    hdmi->pre_cfg = starfive_hdmi_phy_get_pre_pll_cfg(hdmi, hdmi->tmds_rate);
>> +    if (IS_ERR(hdmi->pre_cfg))
>> +        return PTR_ERR(hdmi->pre_cfg);
>> +
>> +    for (; hdmi->post_cfg->tmdsclock != 0; hdmi->post_cfg++)
>> +        if (hdmi->tmds_rate <= hdmi->post_cfg->tmdsclock)
>> +            break;
>> +
>> +    starfive_hdmi_config_pll(hdmi);
>> +
>> +    return 0;
>> +}
>> +
>> +static int starfive_hdmi_config_video_timing(struct starfive_hdmi *hdmi,
>> +                         struct drm_display_mode *mode)
>> +{
>> +    int value;
>> +    /* Set detail external video timing */
>> +    value = mode->htotal;
>> +    hdmi_writeb(hdmi, HDMI_VIDEO_EXT_HTOTAL_L, value & 0xFF);
>> +    hdmi_writeb(hdmi, HDMI_VIDEO_EXT_HTOTAL_H, (value >> 8) & 0xFF);
> 
> As you have hdmi_writeb already, adding hdmi_writew will help here.
> 
>> +
>> +    value = mode->htotal - mode->hdisplay;
>> +    hdmi_writeb(hdmi, HDMI_VIDEO_EXT_HBLANK_L, value & 0xFF);
>> +    hdmi_writeb(hdmi, HDMI_VIDEO_EXT_HBLANK_H, (value >> 8) & 0xFF);
>> +
>> +    value = mode->htotal - mode->hsync_start;
>> +    hdmi_writeb(hdmi, HDMI_VIDEO_EXT_HDELAY_L, value & 0xFF);
>> +    hdmi_writeb(hdmi, HDMI_VIDEO_EXT_HDELAY_H, (value >> 8) & 0xFF);
>> +
>> +    value = mode->hsync_end - mode->hsync_start;
>> +    hdmi_writeb(hdmi, HDMI_VIDEO_EXT_HDURATION_L, value & 0xFF);
>> +    hdmi_writeb(hdmi, HDMI_VIDEO_EXT_HDURATION_H, (value >> 8) & 0xFF);
>> +
>> +    value = mode->vtotal;
>> +    hdmi_writeb(hdmi, HDMI_VIDEO_EXT_VTOTAL_L, value & 0xFF);
>> +    hdmi_writeb(hdmi, HDMI_VIDEO_EXT_VTOTAL_H, (value >> 8) & 0xFF);
>> +
>> +    value = mode->vtotal - mode->vdisplay;
>> +    hdmi_writeb(hdmi, HDMI_VIDEO_EXT_VBLANK, value & 0xFF);
>> +
>> +    value = mode->vtotal - mode->vsync_start;
>> +    hdmi_writeb(hdmi, HDMI_VIDEO_EXT_VDELAY, value & 0xFF);
>> +
>> +    value = mode->vsync_end - mode->vsync_start;
>> +    hdmi_writeb(hdmi, HDMI_VIDEO_EXT_VDURATION, value & 0xFF);
>> +
>> +    /* Set detail external video timing polarity and interlace mode */
>> +    value = v_EXTERANL_VIDEO(1);
>> +    value |= mode->flags & DRM_MODE_FLAG_PHSYNC ?
>> +        v_HSYNC_POLARITY(1) : v_HSYNC_POLARITY(0);
>> +    value |= mode->flags & DRM_MODE_FLAG_PVSYNC ?
>> +        v_VSYNC_POLARITY(1) : v_VSYNC_POLARITY(0);
>> +    value |= mode->flags & DRM_MODE_FLAG_INTERLACE ?
>> +        v_INETLACE(1) : v_INETLACE(0);
>> +
>> +    hdmi_writeb(hdmi, HDMI_VIDEO_TIMING_CTL, value);
>> +    return 0;
>> +}
>> +
>> +static int starfive_hdmi_setup(struct starfive_hdmi *hdmi,
>> +                   struct drm_display_mode *mode)
>> +{
>> +    hdmi_modb(hdmi, STARFIVE_BIAS_CONTROL, STARFIVE_BIAS_ENABLE, STARFIVE_BIAS_ENABLE);
>> +    hdmi_writeb(hdmi, STARFIVE_RX_CONTROL, STARFIVE_RX_ENABLE);
>> +    hdmi->hdmi_data.vic = drm_match_cea_mode(mode);
>> +
>> +    hdmi->tmds_rate = mode->clock * 1000;
>> +    starfive_hdmi_phy_clk_set_rate(hdmi);
>> +
>> +    while (!(hdmi_readb(hdmi, STARFIVE_PRE_PLL_LOCK_STATUS) & 0x1))
>> +        continue;
>> +    while (!(hdmi_readb(hdmi, STARFIVE_POST_PLL_LOCK_STATUS) & 0x1))
>> +        continue;
> 
> Please use read_iopoll_timeout here.
> 
>> +
>> +    /*turn on LDO*/
>> +    hdmi_writeb(hdmi, STARFIVE_LDO_CONTROL, STARFIVE_LDO_ENABLE);
>> +    /*turn on serializer*/
>> +    hdmi_writeb(hdmi, STARFIVE_SERIALIER_CONTROL, STARFIVE_SERIALIER_ENABLE);
>> +
>> +    starfive_hdmi_tx_phy_power_down(hdmi);
>> +    starfive_hdmi_config_video_timing(hdmi, mode);
>> +    starfive_hdmi_tx_phy_power_on(hdmi);
>> +
>> +    starfive_hdmi_tmds_driver_on(hdmi);
>> +    starfive_hdmi_sync_tmds(hdmi);
>> +
>> +    return 0;
>> +}
>> +
>> +static void starfive_hdmi_encoder_mode_set(struct drm_encoder *encoder,
>> +                       struct drm_display_mode *mode,
>> +                       struct drm_display_mode *adj_mode)
>> +{
>> +    struct starfive_hdmi *hdmi = encoder_to_hdmi(encoder);
>> +
>> +    drm_mode_copy(&hdmi->previous_mode, adj_mode);
> 
> Why do you need it?
> 
>> +}
>> +
>> +static void starfive_hdmi_encoder_enable(struct drm_encoder *encoder)
>> +{
>> +    struct starfive_hdmi *hdmi = encoder_to_hdmi(encoder);
>> +    struct drm_display_mode *mode = &encoder->crtc->state->adjusted_mode;
>> +    int ret, idx;
>> +    struct drm_device *drm = hdmi->connector.dev;
>> +
>> +    if (drm && !drm_dev_enter(drm, &idx))
>> +        return;
>> +
>> +    ret = pm_runtime_get_sync(hdmi->dev);
>> +    if (ret < 0)
>> +        return;
>> +    mdelay(10);
>> +    starfive_hdmi_setup(hdmi, mode);
>> +
>> +    if (drm)
>> +        drm_dev_exit(idx);
>> +}
>> +
>> +static void starfive_hdmi_encoder_disable(struct drm_encoder *encoder)
>> +{
>> +    struct starfive_hdmi *hdmi = encoder_to_hdmi(encoder);
>> +
>> +    int idx;
>> +    struct drm_device *drm = hdmi->connector.dev;
>> +
>> +    if (drm && !drm_dev_enter(drm, &idx))
>> +        return;
>> +
>> +    pm_runtime_put(hdmi->dev);
>> +
>> +    if (drm)
>> +        drm_dev_exit(idx);
>> +}
>> +
>> +static int
>> +starfive_hdmi_encoder_atomic_check(struct drm_encoder *encoder,
>> +                   struct drm_crtc_state *crtc_state,
>> +                   struct drm_connector_state *conn_state)
>> +{
>> +    bool valid = false;
>> +    struct drm_display_mode *mode = &crtc_state->adjusted_mode;
>> +    struct vs_crtc_state *vs_crtc_state = to_vs_crtc_state(crtc_state);
>> +
>> +    vs_crtc_state->encoder_type = encoder->encoder_type;
>> +    vs_crtc_state->output_fmt = MEDIA_BUS_FMT_RGB888_1X24;
>> +
>> +    const struct pre_pll_config *cfg = pre_pll_cfg_table;
>> +    int pclk = mode->clock * 1000;
>> +
>> +    for (; cfg->pixclock != 0; cfg++) {
>> +        if (pclk == cfg->pixclock) {
>> +            if (pclk > 297000000)
> 
> Magic value.
> 
>> +                continue;
>> +
>> +            valid = true;
>> +            break;
>> +        }
>> +    }
>> +
>> +    return (valid) ? 0 : -EINVAL;
>> +}
>> +
>> +static const struct drm_encoder_helper_funcs starfive_hdmi_encoder_helper_funcs = {
>> +    .enable     = starfive_hdmi_encoder_enable,
>> +    .disable    = starfive_hdmi_encoder_disable,
>> +    .mode_set   = starfive_hdmi_encoder_mode_set,
>> +    .atomic_check = starfive_hdmi_encoder_atomic_check,
>> +};
>> +
>> +static enum drm_connector_status
>> +starfive_hdmi_connector_detect(struct drm_connector *connector, bool force)
>> +{
>> +    struct starfive_hdmi *hdmi = connector_to_hdmi(connector);
>> +    struct drm_device *drm = hdmi->connector.dev;
>> +    int ret;
>> +    int idx;
>> +
>> +    if (drm && !drm_dev_enter(drm, &idx))
>> +        return connector_status_disconnected;
>> +
>> +    ret = pm_runtime_get_sync(hdmi->dev);
>> +    if (ret < 0)
>> +        return ret;
>> +
>> +    ret = (hdmi_readb(hdmi, HDMI_STATUS) & m_HOTPLUG) ?
>> +        connector_status_connected : connector_status_disconnected;
>> +    pm_runtime_put(hdmi->dev);
>> +
>> +    if (drm)
>> +        drm_dev_exit(idx);
>> +
>> +    return ret;
>> +}
>> +
>> +static int starfive_hdmi_connector_get_modes(struct drm_connector *connector)
>> +{
>> +    struct starfive_hdmi *hdmi = connector_to_hdmi(connector);
>> +    struct edid *edid;
>> +    int ret = 0;
>> +
>> +    if (!hdmi->ddc)
>> +        return 0;
>> +    ret = pm_runtime_get_sync(hdmi->dev);
>> +    if (ret < 0)
>> +        return ret;
>> +
>> +    edid = drm_get_edid(connector, hdmi->ddc);
>> +    if (edid) {
>> +        hdmi->hdmi_data.sink_is_hdmi = drm_detect_hdmi_monitor(edid);
>> +        hdmi->hdmi_data.sink_has_audio = drm_detect_monitor_audio(edid);
>> +        drm_connector_update_edid_property(connector, edid);
>> +        ret = drm_add_edid_modes(connector, edid);
>> +        kfree(edid);
>> +    }
>> +    pm_runtime_put(hdmi->dev);
> 
> Can you use drm_connector_helper_get_modes_from_ddc() here? And then drm_display_info.is_hdmi and .has_audio.
> 
>> +
>> +    return ret;
>> +}
>> +
>> +static enum drm_mode_status
>> +starfive_hdmi_connector_mode_valid(struct drm_connector *connector,
>> +                   struct drm_display_mode *mode)
>> +{
>> +    const struct pre_pll_config *cfg = pre_pll_cfg_table;
>> +    int pclk = mode->clock * 1000;
>> +    bool valid = false;
>> +
>> +    for (; cfg->pixclock != 0; cfg++) {
>> +        if (pclk == cfg->pixclock) {
>> +            if (pclk > 297000000)
> 
> magic value
> 
>> +                continue;
>> +
>> +            valid = true;
>> +            break;
>> +        }
>> +    }
>> +
>> +    return (valid) ? MODE_OK : MODE_BAD;
>> +}
>> +
>> +static int
>> +starfive_hdmi_probe_single_connector_modes(struct drm_connector *connector,
>> +                       u32 maxX, u32 maxY)
>> +{
>> +    return drm_helper_probe_single_connector_modes(connector, 3840, 2160);
>> +}
>> +
>> +static const struct drm_connector_funcs starfive_hdmi_connector_funcs = {
>> +    .fill_modes = starfive_hdmi_probe_single_connector_modes,
>> +    .detect = starfive_hdmi_connector_detect,
>> +    .reset = drm_atomic_helper_connector_reset,
>> +    .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
>> +    .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
>> +};
>> +
>> +static struct drm_connector_helper_funcs starfive_hdmi_connector_helper_funcs = {
>> +    .get_modes = starfive_hdmi_connector_get_modes,
>> +    .mode_valid = starfive_hdmi_connector_mode_valid,
>> +};
>> +
>> +static int starfive_hdmi_register(struct drm_device *drm, struct starfive_hdmi *hdmi)
>> +{
>> +    struct drm_encoder *encoder = &hdmi->encoder;
>> +    struct device *dev = hdmi->dev;
>> +
>> +    encoder->possible_crtcs = drm_of_find_possible_crtcs(drm, dev->of_node);
>> +
>> +    /*
>> +     * If we failed to find the CRTC(s) which this encoder is
>> +     * supposed to be connected to, it's because the CRTC has
>> +     * not been registered yet.  Defer probing, and hope that
>> +     * the required CRTC is added later.
>> +     */
>> +    if (encoder->possible_crtcs == 0)
>> +        return -EPROBE_DEFER;
>> +
>> +    drm_encoder_helper_add(encoder, &starfive_hdmi_encoder_helper_funcs);
>> +
>> +    hdmi->connector.polled = DRM_CONNECTOR_POLL_HPD;
>> +
>> +    drm_connector_helper_add(&hdmi->connector,
>> +                 &starfive_hdmi_connector_helper_funcs);
>> +    drmm_connector_init(drm, &hdmi->connector,
>> +                &starfive_hdmi_connector_funcs,
>> +                DRM_MODE_CONNECTOR_HDMIA,
> 
> On an embedded device one can not be so sure. There can be MHL or HDMI Alternative Mode. Usually we use drm_bridge here and drm_bridge_connector.
> 
>> +                hdmi->ddc);
>> +
>> +    drm_connector_attach_encoder(&hdmi->connector, encoder);
>> +
>> +    return 0;
>> +}
>> +
>> +static irqreturn_t starfive_hdmi_i2c_irq(struct starfive_hdmi *hdmi)
>> +{
>> +    struct starfive_hdmi_i2c *i2c = hdmi->i2c;
>> +    u8 stat;
>> +
>> +    stat = hdmi_readb(hdmi, HDMI_INTERRUPT_STATUS1);
>> +    if (!(stat & m_INT_EDID_READY))
>> +        return IRQ_NONE;
>> +
>> +    /* Clear HDMI EDID interrupt flag */
>> +    hdmi_writeb(hdmi, HDMI_INTERRUPT_STATUS1, m_INT_EDID_READY);
>> +
>> +    complete(&i2c->cmp);
>> +
>> +    return IRQ_HANDLED;
>> +}
>> +
>> +static irqreturn_t starfive_hdmi_hardirq(int irq, void *dev_id)
>> +{
>> +    struct starfive_hdmi *hdmi = dev_id;
>> +    irqreturn_t ret = IRQ_NONE;
>> +    u8 interrupt;
>> +
>> +    if (hdmi->i2c)
>> +        ret = starfive_hdmi_i2c_irq(hdmi);
>> +
>> +    interrupt = hdmi_readb(hdmi, HDMI_STATUS);
>> +    if (interrupt & m_INT_HOTPLUG) {
>> +        hdmi_modb(hdmi, HDMI_STATUS, m_INT_HOTPLUG, m_INT_HOTPLUG);
>> +        ret = IRQ_WAKE_THREAD;
>> +    }
>> +
>> +    return ret;
>> +}
>> +
>> +static irqreturn_t starfive_hdmi_irq(int irq, void *dev_id)
>> +{
>> +    struct starfive_hdmi *hdmi = dev_id;
>> +
>> +    drm_connector_helper_hpd_irq_event(&hdmi->connector);
>> +
>> +    return IRQ_HANDLED;
>> +}
>> +
>> +static int starfive_hdmi_i2c_read(struct starfive_hdmi *hdmi, struct i2c_msg *msgs)
>> +{
>> +    int length = msgs->len;
>> +    u8 *buf = msgs->buf;
>> +    int ret;
>> +
>> +    ret = wait_for_completion_timeout(&hdmi->i2c->cmp, HZ / 10);
> 
> read_poll_timeout
Hi Dmitry:
I think using wait_for_completion_timeout here is a bit clearer than read_poll_timeout logic
I2c_read has hardware interrupt dependency. so need wait the interrupt completion.
also it comes with timeout detection.

> 
>> +    if (!ret)
>> +        return -EAGAIN;
>> +
>> +    while (length--)
>> +        *buf++ = hdmi_readb(hdmi, HDMI_EDID_FIFO_ADDR);
>> +
>> +    return 0;
>> +}
>> +
>> +static int starfive_hdmi_i2c_write(struct starfive_hdmi *hdmi, struct i2c_msg *msgs)
>> +{
>> +    /*
>> +     * The DDC module only support read EDID message, so
>> +     * we assume that each word write to this i2c adapter
>> +     * should be the offset of EDID word address.
>> +     */
>> +    if (msgs->len != 1 ||
>> +        (msgs->addr != DDC_ADDR && msgs->addr != DDC_SEGMENT_ADDR))
>> +        return -EINVAL;
>> +
>> +    reinit_completion(&hdmi->i2c->cmp);
>> +
>> +    if (msgs->addr == DDC_SEGMENT_ADDR)
>> +        hdmi->i2c->segment_addr = msgs->buf[0];
>> +    if (msgs->addr == DDC_ADDR)
>> +        hdmi->i2c->ddc_addr = msgs->buf[0];
>> +
>> +    /* Set edid fifo first addr */
>> +    hdmi_writeb(hdmi, HDMI_EDID_FIFO_OFFSET, 0x00);
>> +
>> +    /* Set edid word address 0x00/0x80 */
>> +    hdmi_writeb(hdmi, HDMI_EDID_WORD_ADDR, hdmi->i2c->ddc_addr);
>> +
>> +    /* Set edid segment pointer */
>> +    hdmi_writeb(hdmi, HDMI_EDID_SEGMENT_POINTER, hdmi->i2c->segment_addr);
>> +
>> +    return 0;
>> +}
>> +
>> +static int starfive_hdmi_i2c_xfer(struct i2c_adapter *adap,
>> +                  struct i2c_msg *msgs, int num)
>> +{
>> +    struct starfive_hdmi *hdmi = i2c_get_adapdata(adap);
>> +    struct starfive_hdmi_i2c *i2c = hdmi->i2c;
>> +    int i, ret = 0;
>> +
>> +    mutex_lock(&i2c->lock);
>> +
>> +    /* Clear the EDID interrupt flag and unmute the interrupt */
>> +    hdmi_writeb(hdmi, HDMI_INTERRUPT_MASK1, m_INT_EDID_READY);
>> +    hdmi_writeb(hdmi, HDMI_INTERRUPT_STATUS1, m_INT_EDID_READY);
>> +
>> +    for (i = 0; i < num; i++) {
>> +        DRM_DEV_DEBUG(hdmi->dev,
>> +                  "xfer: num: %d/%d, len: %d, flags: %#x\n",
>> +                  i + 1, num, msgs[i].len, msgs[i].flags);
>> +
>> +        if (msgs[i].flags & I2C_M_RD)
>> +            ret = starfive_hdmi_i2c_read(hdmi, &msgs[i]);
>> +        else
>> +            ret = starfive_hdmi_i2c_write(hdmi, &msgs[i]);
>> +
>> +        if (ret < 0)
>> +            break;
>> +    }
>> +
>> +    if (!ret)
>> +        ret = num;
>> +
>> +    /* Mute HDMI EDID interrupt */
>> +    hdmi_writeb(hdmi, HDMI_INTERRUPT_MASK1, 0);
>> +
>> +    mutex_unlock(&i2c->lock);
>> +
>> +    return ret;
>> +}
>> +
>> +static u32 starfive_hdmi_i2c_func(struct i2c_adapter *adapter)
>> +{
>> +    return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
>> +}
>> +
>> +static const struct i2c_algorithm starfive_hdmi_algorithm = {
>> +    .master_xfer    = starfive_hdmi_i2c_xfer,
>> +    .functionality    = starfive_hdmi_i2c_func,
>> +};
>> +
>> +static struct i2c_adapter *starfive_hdmi_i2c_adapter(struct starfive_hdmi *hdmi)
>> +{
>> +    struct i2c_adapter *adap;
>> +    struct starfive_hdmi_i2c *i2c;
>> +    int ret;
>> +
>> +    i2c = drmm_kzalloc(hdmi->drm_dev, sizeof(*i2c), GFP_KERNEL);
>> +    if (!i2c)
>> +        return ERR_PTR(-ENOMEM);
>> +
>> +    mutex_init(&i2c->lock);
>> +    init_completion(&i2c->cmp);
>> +
>> +    adap = &i2c->adap;
>> +    adap->class = I2C_CLASS_DDC;
>> +    adap->owner = THIS_MODULE;
>> +    adap->dev.parent = hdmi->dev;
>> +    adap->algo = &starfive_hdmi_algorithm;
>> +    strscpy(adap->name, "Starfive HDMI", sizeof(adap->name));
>> +    i2c_set_adapdata(adap, hdmi);
>> +
>> +    ret = devm_i2c_add_adapter(hdmi->dev, adap);
>> +    if (ret) {
>> +        drm_warn(hdmi->drm_dev, "cannot add %s I2C adapter\n", adap->name);
>> +        return ERR_PTR(ret);
>> +    }
>> +
>> +    hdmi->i2c = i2c;
>> +
>> +    drm_info(hdmi->drm_dev, "registered %s I2C bus driver success\n", adap->name);
>> +
>> +    return adap;
>> +}
>> +
>> +static int starfive_hdmi_get_clk_rst(struct device *dev, struct starfive_hdmi *hdmi)
>> +{
>> +    hdmi->sys_clk = devm_clk_get(dev, "sysclk");
>> +    if (IS_ERR(hdmi->sys_clk)) {
>> +        dev_err(dev, "Unable to get HDMI sysclk clk\n");
>> +        return PTR_ERR(hdmi->sys_clk);
>> +    }
>> +    hdmi->mclk = devm_clk_get(dev, "mclk");
>> +    if (IS_ERR(hdmi->mclk)) {
>> +        dev_err(dev, "Unable to get HDMI mclk clk\n");
>> +        return PTR_ERR(hdmi->mclk);
>> +    }
>> +    hdmi->bclk = devm_clk_get(dev, "bclk");
>> +    if (IS_ERR(hdmi->bclk)) {
>> +        dev_err(dev, "Unable to get HDMI bclk clk\n");
>> +        return PTR_ERR(hdmi->bclk);
>> +    }
>> +    hdmi->tx_rst = devm_reset_control_get_by_index(dev, 0);
>> +    if (IS_ERR(hdmi->tx_rst)) {
>> +        dev_err(dev, "failed to get tx_rst reset\n");
>> +        return PTR_ERR(hdmi->tx_rst);
>> +    }
>> +
>> +    return 0;
>> +}
>> +
>> +static int starfive_hdmi_bind(struct device *dev, struct device *master,
>> +                  void *data)
>> +{
>> +    struct platform_device *pdev = to_platform_device(dev);
>> +    struct drm_device *drm = dev_get_drvdata(master);
>> +    struct starfive_hdmi *hdmi;
>> +    struct resource *iores;
>> +    int irq;
>> +    int ret;
>> +
>> +    hdmi = drmm_kzalloc(drm, sizeof(*hdmi), GFP_KERNEL);
>> +    if (!hdmi)
>> +        return -ENOMEM;
>> +
>> +    hdmi = drmm_simple_encoder_alloc(drm, struct starfive_hdmi,
>> +                     encoder, DRM_MODE_ENCODER_TMDS);
>> +
>> +    hdmi->dev = dev;
>> +    hdmi->drm_dev = drm;
>> +    dev_set_drvdata(dev, hdmi);
>> +
>> +    iores = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>> +    hdmi->regs = devm_ioremap_resource(dev, iores);
> 
> This should go to probe
> 
>> +    if (IS_ERR(hdmi->regs))
>> +        return PTR_ERR(hdmi->regs);
>> +
>> +    ret = starfive_hdmi_get_clk_rst(dev, hdmi);
>> +    if (ret < 0)
>> +        return ret;
> 
> And this
> 
>> +
>> +    ret = devm_pm_runtime_enable(dev);
>> +    if (ret)
>> +        return ret;
>> +
>> +    ret = pm_runtime_resume_and_get(dev);
>> +    if (ret)
>> +        return ret;
>> +
>> +    irq = platform_get_irq(pdev, 0);
> 
> And this
> 
>> +    if (irq < 0) {
>> +        ret = irq;
>> +        goto err_put_runtime_pm;
>> +    }
>> +
>> +    hdmi->ddc = starfive_hdmi_i2c_adapter(hdmi);
>> +    if (IS_ERR(hdmi->ddc)) {
>> +        ret = PTR_ERR(hdmi->ddc);
>> +        hdmi->ddc = NULL;
>> +        goto err_put_runtime_pm;
>> +    }
>> +
>> +    starfive_hdmi_i2c_init(hdmi);
>> +
>> +    ret = starfive_hdmi_register(drm, hdmi);
>> +    if (ret)
>> +        goto err_put_adapter;
>> +
>> +    /* Unmute hotplug interrupt */
>> +    hdmi_modb(hdmi, HDMI_STATUS, m_MASK_INT_HOTPLUG, v_MASK_INT_HOTPLUG(1));
>> +
>> +    ret = devm_request_threaded_irq(dev, irq, starfive_hdmi_hardirq,
>> +                    starfive_hdmi_irq, IRQF_SHARED,
>> +                    dev_name(dev), hdmi);
>> +    if (ret < 0)
>> +        goto err_put_adapter;
>> +
>> +    pm_runtime_put_sync(dev);
>> +
>> +    return 0;
>> +
>> +err_put_adapter:
>> +    i2c_put_adapter(hdmi->ddc);
>> +err_put_runtime_pm:
>> +    pm_runtime_put_sync(dev);
>> +
>> +    return ret;
>> +}
>> +
>> +static const struct component_ops starfive_hdmi_ops = {
>> +    .bind    = starfive_hdmi_bind,
>> +};
>> +
>> +static int starfive_hdmi_probe(struct platform_device *pdev)
>> +{
>> +    return component_add(&pdev->dev, &starfive_hdmi_ops);
>> +}
>> +
>> +static int starfive_hdmi_remove(struct platform_device *pdev)
>> +{
>> +    component_del(&pdev->dev, &starfive_hdmi_ops);
>> +
>> +    return 0;
>> +}
>> +
>> +static const struct dev_pm_ops hdmi_pm_ops = {
>> +    SET_RUNTIME_PM_OPS(hdmi_runtime_suspend, hdmi_runtime_resume, NULL)
>> +    SET_LATE_SYSTEM_SLEEP_PM_OPS(hdmi_system_pm_suspend, hdmi_system_pm_resume)
>> +};
>> +
>> +static const struct of_device_id starfive_hdmi_dt_ids[] = {
>> +    { .compatible = "starfive,jh7110-inno-hdmi",},
>> +    {},
>> +};
>> +MODULE_DEVICE_TABLE(of, starfive_hdmi_dt_ids);
>> +
>> +struct platform_driver starfive_hdmi_driver = {
>> +    .probe  = starfive_hdmi_probe,
>> +    .remove = starfive_hdmi_remove,
>> +    .driver = {
>> +        .name = "starfive-hdmi",
>> +        .of_match_table = starfive_hdmi_dt_ids,
>> +        .pm = &hdmi_pm_ops,
>> +    },
>> +};
>> +
>> +MODULE_AUTHOR("StarFive Corporation");
>> +MODULE_DESCRIPTION("Starfive HDMI Driver");
>> diff --git a/drivers/gpu/drm/verisilicon/starfive_hdmi.h b/drivers/gpu/drm/verisilicon/starfive_hdmi.h
>> new file mode 100644
>> index 000000000..1b9a11bca
>> --- /dev/null
>> +++ b/drivers/gpu/drm/verisilicon/starfive_hdmi.h
>> @@ -0,0 +1,295 @@
>> +/* SPDX-License-Identifier: GPL-2.0-only */
>> +/*
>> + * Copyright (C) 2023 StarFive Technology Co., Ltd.
>> + */
>> +
>> +#ifndef __STARFIVE_HDMI_H__
>> +#define __STARFIVE_HDMI_H__
>> +
>> +#include <drm/bridge/dw_hdmi.h>
>> +#include <drm/drm_atomic_helper.h>
>> +#include <drm/drm_edid.h>
>> +#include <drm/drm_of.h>
>> +#include <drm/drm_probe_helper.h>
>> +#include <drm/drm_simple_kms_helper.h>
>> +#include <linux/bitfield.h>
>> +#include <linux/bits.h>
>> +
>> +#define DDC_SEGMENT_ADDR        0x30
>> +
>> +#define HDMI_SCL_RATE            (100 * 1000)
>> +#define DDC_BUS_FREQ_L            0x4b
>> +#define DDC_BUS_FREQ_H            0x4c
>> +
>> +#define HDMI_SYS_CTRL            0x00
>> +#define m_RST_ANALOG            BIT(6)
>> +#define v_RST_ANALOG            0
>> +#define v_NOT_RST_ANALOG        BIT(6)
>> +#define m_RST_DIGITAL            BIT(5)
>> +#define v_RST_DIGITAL            0
>> +#define v_NOT_RST_DIGITAL        BIT(5)
>> +#define m_REG_CLK_INV            BIT(4)
>> +#define v_REG_CLK_NOT_INV        0
>> +#define v_REG_CLK_INV            BIT(4)
>> +#define m_VCLK_INV            BIT(3)
>> +#define v_VCLK_NOT_INV            0
>> +#define v_VCLK_INV            BIT(3)
>> +#define m_REG_CLK_SOURCE        BIT(2)
>> +#define v_REG_CLK_SOURCE_TMDS        0
>> +#define v_REG_CLK_SOURCE_SYS        BIT(2)
>> +#define m_POWER                BIT(1)
>> +#define v_PWR_ON            0
>> +#define v_PWR_OFF            BIT(1)
>> +#define m_INT_POL            BIT(0)
>> +#define v_INT_POL_HIGH            1
>> +#define v_INT_POL_LOW            0
>> +
>> +#define HDMI_AV_MUTE            0x05
>> +#define m_AVMUTE_CLEAR            BIT(7)
>> +#define m_AVMUTE_ENABLE            BIT(6)
>> +#define m_AUDIO_MUTE            BIT(1)
>> +#define m_VIDEO_BLACK            BIT(0)
>> +#define v_AVMUTE_CLEAR(n)        ((n) << 7)
>> +#define v_AVMUTE_ENABLE(n)        ((n) << 6)
>> +#define v_AUDIO_MUTE(n)            ((n) << 1)
>> +#define v_VIDEO_MUTE(n)            ((n) << 0)
>> +
>> +#define HDMI_VIDEO_TIMING_CTL        0x08
>> +#define v_VSYNC_POLARITY(n)        ((n) << 3)
>> +#define v_HSYNC_POLARITY(n)        ((n) << 2)
>> +#define v_INETLACE(n)            ((n) << 1)
>> +#define v_EXTERANL_VIDEO(n)        ((n) << 0)
>> +
>> +#define HDMI_VIDEO_EXT_HTOTAL_L        0x09
>> +#define HDMI_VIDEO_EXT_HTOTAL_H        0x0a
>> +#define HDMI_VIDEO_EXT_HBLANK_L        0x0b
>> +#define HDMI_VIDEO_EXT_HBLANK_H        0x0c
>> +#define HDMI_VIDEO_EXT_HDELAY_L        0x0d
>> +#define HDMI_VIDEO_EXT_HDELAY_H        0x0e
>> +#define HDMI_VIDEO_EXT_HDURATION_L    0x0f
>> +#define HDMI_VIDEO_EXT_HDURATION_H    0x10
>> +#define HDMI_VIDEO_EXT_VTOTAL_L        0x11
>> +#define HDMI_VIDEO_EXT_VTOTAL_H        0x12
>> +#define HDMI_VIDEO_EXT_VBLANK        0x13
>> +#define HDMI_VIDEO_EXT_VDELAY        0x14
>> +#define HDMI_VIDEO_EXT_VDURATION    0x15
>> +
>> +#define HDMI_EDID_SEGMENT_POINTER    0x4d
>> +#define HDMI_EDID_WORD_ADDR        0x4e
>> +#define HDMI_EDID_FIFO_OFFSET        0x4f
>> +#define HDMI_EDID_FIFO_ADDR        0x50
>> +
>> +#define HDMI_INTERRUPT_MASK1        0xc0
>> +#define HDMI_INTERRUPT_STATUS1        0xc1
>> +#define    m_INT_ACTIVE_VSYNC        BIT(5)
>> +#define m_INT_EDID_READY        BIT(2)
>> +
>> +#define HDMI_STATUS            0xc8
>> +#define m_HOTPLUG            BIT(7)
>> +#define m_MASK_INT_HOTPLUG        BIT(5)
>> +#define m_INT_HOTPLUG            BIT(1)
>> +#define v_MASK_INT_HOTPLUG(n)        (((n) & 0x1) << 5)
> 
> It is untypical to have field defines which start with lowercase letter.
> 
>> +
>> +#define HDMI_SYNC                    0xce
>> +
>> +#define UPDATE(x, h, l)                    FIELD_PREP(GENMASK(h, l), x)
>> +
>> +/* REG: 0x1a0 */
>> +#define STARFIVE_PRE_PLL_CONTROL            0x1a0
>> +#define STARFIVE_PCLK_VCO_DIV_5_MASK            BIT(1)
>> +#define STARFIVE_PCLK_VCO_DIV_5(x)            UPDATE(x, 1, 1)
>> +#define STARFIVE_PRE_PLL_POWER_DOWN            BIT(0)
>> +
>> +/* REG: 0x1a1 */
>> +#define STARFIVE_PRE_PLL_DIV_1                0x1a1
>> +#define STARFIVE_PRE_PLL_PRE_DIV_MASK            GENMASK(5, 0)
>> +#define STARFIVE_PRE_PLL_PRE_DIV(x)            UPDATE(x, 5, 0)
>> +
>> +/* REG: 0x1a2 */
>> +#define STARFIVE_PRE_PLL_DIV_2                0x1a2
>> +#define STARFIVE_SPREAD_SPECTRUM_MOD_DOWN        BIT(7)
>> +#define STARFIVE_SPREAD_SPECTRUM_MOD_DISABLE        BIT(6)
>> +#define STARFIVE_PRE_PLL_FRAC_DIV_DISABLE        UPDATE(3, 5, 4)
>> +#define STARFIVE_PRE_PLL_FB_DIV_11_8_MASK        GENMASK(3, 0)
>> +#define STARFIVE_PRE_PLL_FB_DIV_11_8(x)            UPDATE((x) >> 8, 3, 0)
>> +
>> +/* REG: 0x1a3 */
>> +#define STARFIVE_PRE_PLL_DIV_3                0x1a3
>> +#define STARFIVE_PRE_PLL_FB_DIV_7_0(x)            UPDATE(x, 7, 0)
>> +
>> +/* REG: 0x1a4*/
>> +#define STARFIVE_PRE_PLL_DIV_4                0x1a4
>> +#define STARFIVE_PRE_PLL_TMDSCLK_DIV_C_MASK        GENMASK(1, 0)
>> +#define STARFIVE_PRE_PLL_TMDSCLK_DIV_C(x)        UPDATE(x, 1, 0)
>> +#define STARFIVE_PRE_PLL_TMDSCLK_DIV_B_MASK        GENMASK(3, 2)
>> +#define STARFIVE_PRE_PLL_TMDSCLK_DIV_B(x)        UPDATE(x, 3, 2)
>> +#define STARFIVE_PRE_PLL_TMDSCLK_DIV_A_MASK        GENMASK(5, 4)
>> +#define STARFIVE_PRE_PLL_TMDSCLK_DIV_A(x)        UPDATE(x, 5, 4)
>> +
>> +/* REG: 0x1a5 */
>> +#define STARFIVE_PRE_PLL_DIV_5                0x1a5
>> +#define STARFIVE_PRE_PLL_PCLK_DIV_B_SHIFT        5
>> +#define STARFIVE_PRE_PLL_PCLK_DIV_B_MASK        GENMASK(6, 5)
>> +#define STARFIVE_PRE_PLL_PCLK_DIV_B(x)            UPDATE(x, 6, 5)
>> +#define STARFIVE_PRE_PLL_PCLK_DIV_A_MASK        GENMASK(4, 0)
>> +#define STARFIVE_PRE_PLL_PCLK_DIV_A(x)            UPDATE(x, 4, 0)
>> +
>> +/* REG: 0x1a6 */
>> +#define STARFIVE_PRE_PLL_DIV_6                0x1a6
>> +#define STARFIVE_PRE_PLL_PCLK_DIV_C_SHIFT        5
>> +#define STARFIVE_PRE_PLL_PCLK_DIV_C_MASK        GENMASK(6, 5)
>> +#define STARFIVE_PRE_PLL_PCLK_DIV_C(x)            UPDATE(x, 6, 5)
>> +#define STARFIVE_PRE_PLL_PCLK_DIV_D_MASK        GENMASK(4, 0)
>> +#define STARFIVE_PRE_PLL_PCLK_DIV_D(x)            UPDATE(x, 4, 0)
>> +
>> +/* REG: 0x1a9 */
>> +#define STARFIVE_PRE_PLL_LOCK_STATUS            0x1a9
>> +
>> +/* REG: 0x1aa */
>> +#define STARFIVE_POST_PLL_DIV_1                0x1aa
>> +#define STARFIVE_POST_PLL_POST_DIV_ENABLE        GENMASK(3, 2)
>> +#define STARFIVE_POST_PLL_REFCLK_SEL_TMDS        BIT(1)
>> +#define STARFIVE_POST_PLL_POWER_DOWN            BIT(0)
>> +#define STARFIVE_POST_PLL_FB_DIV_8(x)            UPDATE(((x) >> 8) << 4, 4, 4)
>> +
>> +/* REG:0x1ab */
>> +#define STARFIVE_POST_PLL_DIV_2                0x1ab
>> +#define STARFIVE_POST_PLL_Pre_DIV_MASK            GENMASK(5, 0)
>> +#define STARFIVE_POST_PLL_PRE_DIV(x)            UPDATE(x, 5, 0)
>> +
>> +/* REG: 0x1ac */
>> +#define STARFIVE_POST_PLL_DIV_3                0x1ac
>> +#define STARFIVE_POST_PLL_FB_DIV_7_0(x)            UPDATE(x, 7, 0)
>> +
>> +/* REG: 0x1ad */
>> +#define STARFIVE_POST_PLL_DIV_4                0x1ad
>> +#define STARFIVE_POST_PLL_POST_DIV_MASK            GENMASK(2, 0)
>> +#define STARFIVE_POST_PLL_POST_DIV_2            0x0
>> +#define STARFIVE_POST_PLL_POST_DIV_4            0x1
>> +#define STARFIVE_POST_PLL_POST_DIV_8            0x3
>> +
>> +/* REG: 0x1af */
>> +#define STARFIVE_POST_PLL_LOCK_STATUS            0x1af
>> +
>> +/* REG: 0x1b0 */
>> +#define STARFIVE_BIAS_CONTROL                0x1b0
>> +#define STARFIVE_BIAS_ENABLE                BIT(2)
>> +
>> +/* REG: 0x1b2 */
>> +#define STARFIVE_TMDS_CONTROL                0x1b2
>> +#define STARFIVE_TMDS_CLK_DRIVER_EN            BIT(3)
>> +#define STARFIVE_TMDS_D2_DRIVER_EN            BIT(2)
>> +#define STARFIVE_TMDS_D1_DRIVER_EN            BIT(1)
>> +#define STARFIVE_TMDS_D0_DRIVER_EN            BIT(0)
>> +#define STARFIVE_TMDS_DRIVER_ENABLE            (STARFIVE_TMDS_CLK_DRIVER_EN | \
>> +                             STARFIVE_TMDS_D2_DRIVER_EN | \
>> +                             STARFIVE_TMDS_D1_DRIVER_EN | \
>> +                             STARFIVE_TMDS_D0_DRIVER_EN)
>> +
>> +/* REG: 0x1b4 */
>> +#define STARFIVE_LDO_CONTROL                0x1b4
>> +#define STARFIVE_LDO_D2_EN                BIT(2)
>> +#define STARFIVE_LDO_D1_EN                BIT(1)
>> +#define STARFIVE_LDO_D0_EN                BIT(0)
>> +#define STARFIVE_LDO_ENABLE                (STARFIVE_LDO_D2_EN | \
>> +                             STARFIVE_LDO_D1_EN | \
>> +                             STARFIVE_LDO_D0_EN)
>> +
>> +/* REG: 0x1be */
>> +#define STARFIVE_SERIALIER_CONTROL            0x1be
>> +#define STARFIVE_SERIALIER_D2_EN            BIT(6)
>> +#define STARFIVE_SERIALIER_D1_EN            BIT(5)
>> +#define STARFIVE_SERIALIER_D0_EN            BIT(4)
>> +#define STARFIVE_SERIALIER_EN                BIT(0)
>> +
>> +#define STARFIVE_SERIALIER_ENABLE            (STARFIVE_SERIALIER_D2_EN | \
>> +                             STARFIVE_SERIALIER_D1_EN | \
>> +                             STARFIVE_SERIALIER_D0_EN | \
>> +                             STARFIVE_SERIALIER_EN)
>> +
>> +/* REG: 0x1cc */
>> +#define STARFIVE_RX_CONTROL                0x1cc
>> +#define STARFIVE_RX_EN                    BIT(3)
>> +#define STARFIVE_RX_CHANNEL_2_EN            BIT(2)
>> +#define STARFIVE_RX_CHANNEL_1_EN            BIT(1)
>> +#define STARFIVE_RX_CHANNEL_0_EN            BIT(0)
>> +#define STARFIVE_RX_ENABLE                (STARFIVE_RX_EN | \
>> +                             STARFIVE_RX_CHANNEL_2_EN | \
>> +                             STARFIVE_RX_CHANNEL_1_EN | \
>> +                             STARFIVE_RX_CHANNEL_0_EN)
>> +
>> +/* REG: 0x1d1 */
>> +#define STARFIVE_PRE_PLL_FRAC_DIV_H            0x1d1
>> +#define STARFIVE_PRE_PLL_FRAC_DIV_23_16(x)        UPDATE((x) >> 16, 7, 0)
>> +/* REG: 0x1d2 */
>> +#define STARFIVE_PRE_PLL_FRAC_DIV_M            0x1d2
>> +#define STARFIVE_PRE_PLL_FRAC_DIV_15_8(x)        UPDATE((x) >> 8, 7, 0)
>> +/* REG: 0x1d3 */
>> +#define STARFIVE_PRE_PLL_FRAC_DIV_L            0x1d3
>> +#define STARFIVE_PRE_PLL_FRAC_DIV_7_0(x)        UPDATE(x, 7, 0)
>> +
>> +struct pre_pll_config {
>> +    unsigned long pixclock;
>> +    unsigned long tmdsclock;
>> +    u8 prediv;
>> +    u16 fbdiv;
>> +    u8 tmds_div_a;
>> +    u8 tmds_div_b;
>> +    u8 tmds_div_c;
>> +    u8 pclk_div_a;
>> +    u8 pclk_div_b;
>> +    u8 pclk_div_c;
>> +    u8 pclk_div_d;
>> +    u8 vco_div_5_en;
>> +    u32 fracdiv;
>> +};
>> +
>> +struct post_pll_config {
>> +    unsigned long tmdsclock;
>> +    u8 prediv;
>> +    u16 fbdiv;
>> +    u8 postdiv;
>> +    u8 post_div_en;
>> +    u8 version;
>> +};
>> +
>> +struct phy_config {
>> +    unsigned long    tmdsclock;
>> +    u8        regs[14];
>> +};
>> +
>> +struct hdmi_data_info {
>> +    int vic;
>> +    bool sink_is_hdmi;
>> +    bool sink_has_audio;
>> +    unsigned int enc_in_format;
>> +    unsigned int enc_out_format;
>> +    unsigned int colorimetry;
>> +};
>> +
>> +struct starfive_hdmi {
>> +    struct device *dev;
>> +    struct drm_device *drm_dev;
>> +    struct drm_encoder    encoder;
>> +    struct drm_connector    connector;
>> +
>> +    struct starfive_hdmi_i2c *i2c;
>> +
>> +    int irq;
>> +    struct clk *sys_clk;
>> +    struct clk *mclk;
>> +    struct clk *bclk;
>> +    struct reset_control *tx_rst;
>> +    void __iomem *regs;
>> +
>> +    struct i2c_adapter *ddc;
>> +
>> +    unsigned long tmds_rate;
>> +
>> +    struct hdmi_data_info    hdmi_data;
>> +    struct drm_display_mode previous_mode;
>> +    const struct pre_pll_config    *pre_cfg;
>> +    const struct post_pll_config    *post_cfg;
>> +};
>> +
>> +#endif /* __STARFIVE_HDMI_H__ */
>> diff --git a/drivers/gpu/drm/verisilicon/vs_drv.c b/drivers/gpu/drm/verisilicon/vs_drv.c
>> index 3cd533cfa..9669354bd 100644
>> --- a/drivers/gpu/drm/verisilicon/vs_drv.c
>> +++ b/drivers/gpu/drm/verisilicon/vs_drv.c
>> @@ -126,6 +126,11 @@ static const struct component_master_ops vs_drm_ops = {
>>   static struct platform_driver *drm_sub_drivers[] = {
>>       &dc_platform_driver,
>>   +    /* connector + encoder*/
>> +#ifdef CONFIG_DRM_VERISILICON_STARFIVE_HDMI
>> +    &starfive_hdmi_driver,
>> +#endif
>> +
>>   };
>>     static struct component_match *vs_drm_match_add(struct device *dev)
>> diff --git a/drivers/gpu/drm/verisilicon/vs_drv.h b/drivers/gpu/drm/verisilicon/vs_drv.h
>> index 369ad22d6..e90723419 100644
>> --- a/drivers/gpu/drm/verisilicon/vs_drv.h
>> +++ b/drivers/gpu/drm/verisilicon/vs_drv.h
>> @@ -24,4 +24,8 @@ to_vs_drm_private(const struct drm_device *dev)
>>       return container_of(dev, struct vs_drm_device, base);
>>   }
>>   +#ifdef CONFIG_DRM_VERISILICON_STARFIVE_HDMI
>> +extern struct platform_driver starfive_hdmi_driver;
>> +#endif
>> +
>>   #endif /* __VS_DRV_H__ */
> 




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