Dear Inki dae,
Sorry for the previous mail which is not completed. I typed something
and it was the shortcut for maybe.
On Tue, 24 Mar 2015 14:51:31 +0900
Inki Dae <inki.dae@xxxxxxxxxxx> wrote:
> On 2015년 03월 18일 17:16, Hyungwon Hwang wrote:
> > MIC(Mobile image compressor) is newly added IP in Exynos5433. MIC
> > resides between decon and mipi dsim, and compresses frame data by
> > 50%. With dsi, not display port, to send frame data to the panel,
> > the bandwidth is not enough. That is why this compressor is
> > introduced.
> >
> > Signed-off-by: Hyungwon Hwang <human.hwang@xxxxxxxxxxx>
> > ---
> > Changes for v2:
> > - make mic driver to be registered by exynos drm driver instead as
> > a module |
> > -------------------------------------------------------------------------------------------------------------
> > driver
> > |
> > -------------------------------------------------------------------------------------------------------------
> > - change the description of mic driver in documentation
> > - add module author at the top of the source file removing
> > MODULE_OWNER, MODULE_DESCRIPTION, MODULE_LICENSE
> > .../devicetree/bindings/video/exynos-mic.txt | 49 +++
> > drivers/gpu/drm/exynos/Kconfig | 6 +
> > drivers/gpu/drm/exynos/Makefile | 1 +
> > drivers/gpu/drm/exynos/exynos_drm_drv.c | 3 +
> > drivers/gpu/drm/exynos/exynos_drm_drv.h | 1 +
> > drivers/gpu/drm/exynos/exynos_drm_mic.c | 481
> > +++++++++++++++++++++ 6 files changed, 541 insertions(+)
> > create mode 100644
> > Documentation/devicetree/bindings/video/exynos-mic.txt create mode
> > 100644 drivers/gpu/drm/exynos/exynos_drm_mic.c
> >
> > diff --git a/Documentation/devicetree/bindings/video/exynos-mic.txt
> > b/Documentation/devicetree/bindings/video/exynos-mic.txt new file
> > mode 100644 index 0000000..006d072
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/video/exynos-mic.txt
> > @@ -0,0 +1,49 @@
> > +Device-Tree bindings for Samsung Exynos SoC mobile image
> > compressor (MIC) +
> > +MIC (mobile image compressor) resides between decon and mipi dsi.
> > Mipi dsi is +not capable to transfer high resoltuion frame data as
> > decon can send. MIC +solves this problem by compressing the frame
> > data by 1/2 before it is transfered +through mipi dsi. The
> > compressed frame data must be uncompressed in the panel +PCB.
> > +
> > +Required properties:
> > +- compatible: value should be "samsung,exynos5433-mic".
> > +- reg: physical base address and length of the MIC registers set
> > and system
> > + register of mic.
> > +- clocks: must include clock specifiers corresponding to entries
> > in the
> > + clock-names property.
> > +- clock-names: list of clock names sorted in the same order as the
> > clocks
> > + property. Must contain "pclk_mic0",
> > "sclk_rgb_vclk_to_mic0". +- ports: contains a port which is
> > connected to decon node and dsi node.
> > + address-cells and size-cells must 1 and 0, respectively.
> > +- port: contains an endpoint node which is connected to the
> > endpoint in the
> > + decon node or dsi node. The reg value must be 0 and 1
> > respectively. +
> > +Example:
> > +SoC specific DT entry:
> > +mic: mic@13930000 {
> > + compatible = "samsung,exynos5433-mic";
> > + reg = <0x13930000 0x48 0x13B80000 0x1010>;
> > + clocks = <&cmu_disp CLK_PCLK_MIC0>,
> > + <&cmu_disp CLK_SCLK_RGB_VCLK_TO_MIC0>;
> > + clock-names = "pclk_mic0", "sclk_rgb_vclk_to_mic0";
> > +
> > + ports {
> > + #address-cells = <1>;
> > + #size-cells = <0>;
> > +
> > + port@0 {
> > + reg = <0>;
> > + mic_to_decon: endpoint {
> > + remote-endpoint = <&decon_to_mic>;
> > + };
> > + };
> > +
> > + port@1 {
> > + reg = <1>;
> > + mic_to_dsi: endpoint {
> > + remote-endpoint = <&dsi_to_mic>;
> > + };
> > + };
> > + };
> > +};
> > diff --git a/drivers/gpu/drm/exynos/Kconfig
> > b/drivers/gpu/drm/exynos/Kconfig index e15cc2e..a796175 100644
> > --- a/drivers/gpu/drm/exynos/Kconfig
> > +++ b/drivers/gpu/drm/exynos/Kconfig
> > @@ -103,3 +103,9 @@ config DRM_EXYNOS_GSC
> > depends on DRM_EXYNOS_IPP && ARCH_EXYNOS5
> > && !ARCH_MULTIPLATFORM help
> > Choose this option if you want to use Exynos GSC for DRM.
> > +
> > +config DRM_EXYNOS_MIC
> > + bool "Exynos DRM MIC"
> > + depends on (DRM_EXYNOS && DRM_EXYNOS5433_DECON)
> > + help
> > + Choose this option if you want to use Exynos MIC for DRM.
> > diff --git a/drivers/gpu/drm/exynos/Makefile
> > b/drivers/gpu/drm/exynos/Makefile index fbd084d..7de0b10 100644
> > --- a/drivers/gpu/drm/exynos/Makefile
> > +++ b/drivers/gpu/drm/exynos/Makefile
> > @@ -22,5 +22,6 @@ exynosdrm-$(CONFIG_DRM_EXYNOS_IPP) +=
> > exynos_drm_ipp.o exynosdrm-$(CONFIG_DRM_EXYNOS_FIMC) +=
> > exynos_drm_fimc.o exynosdrm-$(CONFIG_DRM_EXYNOS_ROTATOR) +=
> > exynos_drm_rotator.o exynosdrm-$(CONFIG_DRM_EXYNOS_GSC) +=
> > exynos_drm_gsc.o +exynosdrm-$(CONFIG_DRM_EXYNOS_MIC) +=
> > exynos_drm_mic.o
> >
> > obj-$(CONFIG_DRM_EXYNOS) += exynosdrm.o
> > diff --git a/drivers/gpu/drm/exynos/exynos_drm_drv.c
> > b/drivers/gpu/drm/exynos/exynos_drm_drv.c index 1fa0dd0..ec9984d
> > 100644 --- a/drivers/gpu/drm/exynos/exynos_drm_drv.c
> > +++ b/drivers/gpu/drm/exynos/exynos_drm_drv.c
> > @@ -562,6 +562,9 @@ static struct platform_driver *const
> > exynos_drm_kms_drivers[] = { #ifdef CONFIG_DRM_EXYNOS7_DECON
> > &decon_driver,
> > #endif
> > +#ifdef CONFIG_DRM_EXYNOS_MIC
> > + &mic_driver,
> > +#endif
> > #ifdef CONFIG_DRM_EXYNOS_DP
> > &dp_driver,
> > #endif
> > diff --git a/drivers/gpu/drm/exynos/exynos_drm_drv.h
> > b/drivers/gpu/drm/exynos/exynos_drm_drv.h index 40996d8..9c94dc9
> > 100644 --- a/drivers/gpu/drm/exynos/exynos_drm_drv.h
> > +++ b/drivers/gpu/drm/exynos/exynos_drm_drv.h
> > @@ -357,4 +357,5 @@ extern struct platform_driver fimc_driver;
> > extern struct platform_driver rotator_driver;
> > extern struct platform_driver gsc_driver;
> > extern struct platform_driver ipp_driver;
> > +extern struct platform_driver mic_driver;
> > #endif
> > diff --git a/drivers/gpu/drm/exynos/exynos_drm_mic.c
> > b/drivers/gpu/drm/exynos/exynos_drm_mic.c new file mode 100644
> > index 0000000..b898a2a
> > --- /dev/null
> > +++ b/drivers/gpu/drm/exynos/exynos_drm_mic.c
> > @@ -0,0 +1,481 @@
> > +/*
> > + * Copyright (C) 2015 Samsung Electronics Co.Ltd
> > + * Authors:
> > + * Hyungwon Hwang <human.hwang@xxxxxxxxxxx>
> > + *
> > + * This program is free software; you can redistribute it and/or
> > modify
> > + * it under the terms of the GNU General Public License version 2
> > as
> > + * published by the Free Software Foundationr
> > + */
> > +
> > +#include <linux/platform_device.h>
> > +#include <video/of_videomode.h>
> > +#include <linux/of_address.h>
> > +#include <video/videomode.h>
> > +#include <linux/module.h>
> > +#include <linux/delay.h>
> > +#include <linux/mutex.h>
> > +#include <linux/of.h>
> > +#include <linux/of_graph.h>
> > +#include <linux/clk.h>
> > +#include <drm/drmP.h>
> > +
> > +/* Sysreg registers for MIC */
> > +#define DSD_CFG_MUX 0x1004
> > +#define MIC0_RGB_MUX (1 << 0)
> > +#define MIC0_I80_MUX (1 << 1)
> > +#define MIC0_ON_MUX (1 << 5)
> > +
> > +/* MIC registers */
> > +#define MIC_OP 0x0
> > +#define MIC_IP_VER 0x0004
> > +#define MIC_V_TIMING_0 0x0008
> > +#define MIC_V_TIMING_1 0x000C
> > +#define MIC_IMG_SIZE 0x0010
> > +#define MIC_INPUT_TIMING_0 0x0014
> > +#define MIC_INPUT_TIMING_1 0x0018
> > +#define MIC_2D_OUTPUT_TIMING_0 0x001C
> > +#define MIC_2D_OUTPUT_TIMING_1 0x0020
> > +#define MIC_2D_OUTPUT_TIMING_2 0x0024
> > +#define MIC_3D_OUTPUT_TIMING_0 0x0028
> > +#define MIC_3D_OUTPUT_TIMING_1 0x002C
> > +#define MIC_3D_OUTPUT_TIMING_2 0x0030
> > +#define MIC_CORE_PARA_0 0x0034
> > +#define MIC_CORE_PARA_1 0x0038
> > +#define MIC_CTC_CTRL 0x0040
> > +#define MIC_RD_DATA 0x0044
> > +
> > +#define MIC_UPD_REG (1 << 31)
> > +#define MIC_ON_REG (1 << 30)
> > +#define MIC_TD_ON_REG (1 << 29)
> > +#define MIC_BS_CHG_OUT (1 << 16)
> > +#define MIC_VIDEO_TYPE(x) (((x) & 0xf) << 12)
> > +#define MIC_PSR_EN (1 << 5)
> > +#define MIC_SW_RST (1 << 4)
> > +#define MIC_ALL_RST (1 << 3)
> > +#define MIC_CORE_VER_CONTROL (1 << 2)
> > +#define MIC_MODE_SEL_COMMAND_MODE (1 << 1)
> > +#define MIC_MODE_SEL_MASK (1 << 1)
> > +#define MIC_CORE_EN (1 << 0)
> > +
> > +#define MIC_V_PULSE_WIDTH(x) (((x) & 0x3fff) << 16)
> > +#define MIC_V_PERIOD_LINE(x) ((x) & 0x3fff)
> > +
> > +#define MIC_VBP_SIZE(x) (((x) & 0x3fff) <<
> > 16) +#define MIC_VFP_SIZE(x) ((x) & 0x3fff)
> > +
> > +#define MIC_IMG_V_SIZE(x) (((x) & 0x3fff) << 16)
> > +#define MIC_IMG_H_SIZE(x) ((x) & 0x3fff)
> > +
> > +#define MIC_H_PULSE_WIDTH_IN(x) (((x) & 0x3fff) <<
> > 16) +#define MIC_H_PERIOD_PIXEL_IN(x) ((x) & 0x3fff)
> > +
> > +#define MIC_HBP_SIZE_IN(x) (((x) & 0x3fff) << 16)
> > +#define MIC_HFP_SIZE_IN(x) ((x) & 0x3fff)
> > +
> > +#define MIC_H_PULSE_WIDTH_2D(x) (((x) & 0x3fff) <<
> > 16) +#define MIC_H_PERIOD_PIXEL_2D(x) ((x) & 0x3fff)
> > +
> > +#define MIC_HBP_SIZE_2D(x) (((x) & 0x3fff) << 16)
> > +#define MIC_HFP_SIZE_2D(x) ((x) & 0x3fff)
> > +
> > +#define MIC_BS_SIZE_2D(x) ((x) & 0x3fff)
> > +
> > +enum {
> > + ENDPOINT_DECON_NODE,
> > + ENDPOINT_DSI_NODE,
> > + NUM_ENDPOINTS
> > +};
> > +
> > +static char *clk_names[] = { "pclk_mic0",
> > "sclk_rgb_vclk_to_mic0" }; +#define NUM_CLKS
> > ARRAY_SIZE(clk_names) +static DEFINE_MUTEX(mic_mutex);
> > +
> > +struct exynos_mic {
> > + struct device *dev;
> > + void __iomem *reg;
> > + void __iomem *sysreg;
> > + struct clk *clks[NUM_CLKS];
> > +
> > + bool i80_mode;
> > + struct videomode vm;
> > + struct drm_encoder *encoder;
> > + struct drm_bridge bridge;
> > +
> > + bool enabled;
> > +};
> > +
> > +static void mic_set_path(struct exynos_mic *mic, bool enable)
> > +{
> > + u32 reg;
> > +
> > + reg = readl(mic->sysreg + DSD_CFG_MUX);
> > + if (enable)
> > + reg |= MIC0_RGB_MUX | MIC0_I80_MUX | MIC0_ON_MUX;
> > + else
> > + reg &= ~(MIC0_RGB_MUX | MIC0_I80_MUX |
> > MIC0_ON_MUX);
>
> exynos_mic has already which video mode - RGB or i80 - is used so it'd
> be reasonable to select one of them to avoid confusing.
>
Yes. I agree.
> > +
> > + writel(reg, mic->sysreg + DSD_CFG_MUX);
> > +}
> > +
> > +static int mic_sw_reset(struct exynos_mic *mic)
> > +{
> > + unsigned int retry = 100;
> > + int ret;
> > +
> > + writel(MIC_SW_RST, mic->reg + MIC_OP);
> > +
> > + while (retry-- > 0) {
> > + ret = readl(mic->reg + MIC_OP);
> > + if (!(ret & MIC_SW_RST))
> > + return 0;
> > +
> > + udelay(10);
> > + }
> > +
> > + return -ETIMEDOUT;
> > +}
> > +
> > +static void mic_set_porch_timing(struct exynos_mic *mic)
> > +{
> > + struct videomode vm;
> > + u32 reg;
> > +
> > + if (!mic->i80_mode) {
>
> It'd be better to check it before this function is called. This
> funcion call really is unnecessary in case of i80 mode.
>
Yes. I agree.
> > + vm = mic->vm;
> > +
> > + reg = MIC_V_PULSE_WIDTH(vm.vsync_len) +
> > + MIC_V_PERIOD_LINE(vm.vsync_len +
> > vm.vactive +
> > + vm.vback_porch +
> > vm.vfront_porch);
> > + writel(reg, mic->reg + MIC_V_TIMING_0);
> > +
> > + reg = MIC_VBP_SIZE(vm.vback_porch) +
> > +
> > MIC_VFP_SIZE(vm.vfront_porch);
> > + writel(reg, mic->reg + MIC_V_TIMING_1);
> > +
> > + reg = MIC_V_PULSE_WIDTH(vm.hsync_len) +
> > + MIC_V_PERIOD_LINE(vm.hsync_len +
> > vm.hactive +
> > + vm.hback_porch +
> > vm.hfront_porch);
> > + writel(reg, mic->reg + MIC_INPUT_TIMING_0);
> > +
> > + reg = MIC_VBP_SIZE(vm.hback_porch) +
> > +
> > MIC_VFP_SIZE(vm.hfront_porch);
> > + writel(reg, mic->reg + MIC_INPUT_TIMING_1);
> > + }
> > +}
> > +
> > +static void mic_set_img_size(struct exynos_mic *mic)
> > +{
> > + struct videomode *vm = &mic->vm;
> > + u32 reg;
> > +
> > + reg = MIC_IMG_H_SIZE(vm->hactive) +
> > + MIC_IMG_V_SIZE(vm->vactive);
> > +
> > + writel(reg, mic->reg + MIC_IMG_SIZE);
> > +}
> > +
> > +static void mic_set_output_timing(struct exynos_mic *mic)
> > +{
> > + struct videomode vm = mic->vm;
> > + u32 reg, bs_size_2d;
> > +
> > + DRM_DEBUG("w: %u, h: %u\n", vm.hactive, vm.vactive);
> > + bs_size_2d = ((vm.hactive >> 2) << 1) + (vm.vactive % 4);
> > + reg = MIC_BS_SIZE_2D(bs_size_2d);
> > + writel(reg, mic->reg + MIC_2D_OUTPUT_TIMING_2);
> > +
> > + if (!mic->i80_mode) {
>
> Ditto.
In this case, MIC_2D_OUTPUT_TIMING_2 must be set whether it is being
used with i80 or RGB interface. MIC_2D_OUTPUT_TIMING_{0/1/2} have
similar names, so I thought that it is good to set them in a function.
Do you think that make a new function for MIC_2D_OUTPUT_TIMING_2?
>
> > + reg = MIC_H_PULSE_WIDTH_2D(vm.hsync_len) +
> > + MIC_H_PERIOD_PIXEL_2D(vm.hsync_len +
> > bs_size_2d +
> > + vm.hback_porch +
> > vm.hfront_porch);
> > + writel(reg, mic->reg + MIC_2D_OUTPUT_TIMING_0);
> > +
> > + reg = MIC_HBP_SIZE_2D(vm.hback_porch) +
> > + MIC_H_PERIOD_PIXEL_2D(vm.hfront_porch);
> > + writel(reg, mic->reg + MIC_2D_OUTPUT_TIMING_1);
> > + }
> > +}
> > +
> > +static void mic_set_reg_on(struct exynos_mic *mic, bool enable)
> > +{
> > + u32 reg = readl(mic->reg + MIC_OP);
> > +
> > + if (enable) {
> > + reg &= ~(MIC_MODE_SEL_MASK | MIC_CORE_VER_CONTROL
> > | MIC_PSR_EN);
> > + reg |= (MIC_CORE_EN | MIC_BS_CHG_OUT | MIC_ON_REG);
> > +
> > + if (mic->i80_mode)
> > + reg |= MIC_MODE_SEL_COMMAND_MODE;
>
> Set explicitly it to video mode in case of RGB mode even though
> MODE_SET field of this register has 0x0 as default.
>
> i.e.,
> reg &= ~MIC_MODE_SEL_COMMAND_MODE;
> if (mic->i80_mode)
> reg |= MIC_MODE_SEL_COMMAND_MODE;
>
Yes. That will make the code more clear.
> > + } else {
> > + reg &= ~MIC_CORE_EN;
> > + }
> > +
> > + reg |= MIC_UPD_REG;
> > + writel(reg, mic->reg + MIC_OP);
> > +}
> > +
> > +static struct device_node *get_remote_node(struct device_node
> > *from, int reg) +{
> > + struct device_node *endpoint = NULL, *remote_node = NULL;
> > +
> > + endpoint = of_graph_get_endpoint_by_regs(from, reg, -1);
> > + if (!endpoint) {
> > + DRM_ERROR("mic: Failed to find remote port from
> > %s",
> > + from->full_name);
> > + goto exit;
> > + }
> > +
> > + remote_node = of_graph_get_remote_port_parent(endpoint);
> > + if (!remote_node) {
> > + DRM_ERROR("mic: Failed to find remote port parent
> > from %s",
> > +
> > from->full_name);
> > + goto exit;
> > + }
> > +
> > +exit:
> > + of_node_put(endpoint);
> > + return remote_node;
> > +}
> > +
> > +static int parse_dt(struct exynos_mic *mic)
> > +{
> > + int ret = 0, i, j;
> > + struct device_node *remote_node;
> > + struct device_node *nodes[3];
> > +
> > + /*
> > + * The order of endpoints does matter.
> > + * The first node must be for decon and the second one
> > must be for dsi.
> > + */
> > + for (i = 0, j = 0; i < NUM_ENDPOINTS; i++) {
> > + remote_node = get_remote_node(mic->dev->of_node,
> > i);
> > + if (!remote_node) {
> > + ret = -EPIPE;
> > + goto exit;
> > + }
> > + nodes[j++] = remote_node;
> > +
> > + switch (i) {
> > + case ENDPOINT_DECON_NODE:
> > + /* decon node */
> > + if (of_get_child_by_name(remote_node,
> > + "i80-if-timings"))
> > + mic->i80_mode = 1;
> > +
> > + break;
> > + case ENDPOINT_DSI_NODE:
> > + /* panel node */
> > + remote_node = get_remote_node(remote_node,
> > 1);
> > + if (!remote_node) {
> > + ret = -EPIPE;
> > + goto exit;
> > + }
> > + nodes[j++] = remote_node;
> > +
> > + ret = of_get_videomode(remote_node,
> > + &mic->vm,
> > 0);
> > + if (ret) {
> > + DRM_ERROR("mic: failed to get
> > videomode");
> > + goto exit;
> > + }
> > +
> > + break;
> > + default:
> > + DRM_ERROR("mic: Unknown endpoint from
> > MIC");
> > + break;
> > + }
> > + }
> > +
> > +exit:
> > + while (--j > -1)
> > + of_node_put(nodes[j]);
> > +
> > + return ret;
> > +}
> > +
> > +void mic_disable(struct drm_bridge *bridge) { }
>
> It seems that drm_encoder_disable function of drm_crtc_helper.c
> doesn't check if the disable callback is NULL or not. Anyway, no
> problem but this funtion could be removed with the disable callback
> checking later.
>
Yes. After the checking code is inserted, it would be better to remove
this function.
> > +
> > +void mic_post_disable(struct drm_bridge *bridge)
> > +{
> > + struct exynos_mic *mic = bridge->driver_private;
> > + int i;
> > +
> > + mutex_lock(&mic_mutex);
> > + if (!mic->enabled)
> > + goto already_disabled;
> > +
> > + mic_set_path(mic, 0);
> > +
> > + for (i = NUM_CLKS - 1; i > -1; i--)
> > + clk_disable_unprepare(mic->clks[i]);
> > +
> > + mic->enabled = 0;
> > +
> > +already_disabled:
> > + mutex_unlock(&mic_mutex);
> > +}
> > +
> > +void mic_pre_enable(struct drm_bridge *bridge)
> > +{
> > + struct exynos_mic *mic = bridge->driver_private;
> > + int ret, i;
> > +
> > + mutex_lock(&mic_mutex);
> > + if (mic->enabled)
> > + goto already_enabled;
> > +
> > + for (i = 0; i < NUM_CLKS; i++) {
> > + ret = clk_prepare_enable(mic->clks[i]);
> > + if (ret < 0) {
> > + DRM_ERROR("Failed to enable clock (%s)\n",
> > +
> > clk_names[i]);
> > + goto turn_off_clks;
> > + }
> > + }
> > +
> > + mic_set_path(mic, 1);
> > +
> > + ret = mic_sw_reset(mic);
> > + if (ret) {
> > + DRM_ERROR("Failed to reset\n");
> > + goto turn_off_clks;
> > + }
> > +
> > + mic_set_porch_timing(mic);
> > + mic_set_img_size(mic);
> > + mic_set_output_timing(mic);
> > + mic_set_reg_on(mic, 1);
> > + mic->enabled = 1;
> > + mutex_unlock(&mic_mutex);
> > +
> > + return;
> > +
> > +turn_off_clks:
> > + while (--i > -1)
> > + clk_disable_unprepare(mic->clks[i]);
> > +already_enabled:
> > + mutex_unlock(&mic_mutex);
> > +}
> > +
> > +void mic_enable(struct drm_bridge *bridge) { }
> > +
> > +void mic_destroy(struct drm_bridge *bridge)
> > +{
> > + struct exynos_mic *mic = bridge->driver_private;
> > + int i;
> > +
> > + mutex_lock(&mic_mutex);
> > + if (!mic->enabled)
> > + goto already_disabled;
> > +
> > + for (i = NUM_CLKS - 1; i > -1; i--)
> > + clk_disable_unprepare(mic->clks[i]);
> > +
> > +already_disabled:
> > + mutex_unlock(&mic_mutex);
> > +}
> > +
> > +struct drm_bridge_funcs mic_bridge_funcs = {
> > + .disable = mic_disable,
> > + .post_disable = mic_post_disable,
> > + .pre_enable = mic_pre_enable,
> > + .enable = mic_enable,
> > +};
> > +
> > +int exynos_mic_probe(struct platform_device *pdev)
> > +{
> > + struct device *dev = &pdev->dev;
> > + struct exynos_mic *mic;
> > + struct resource res;
> > + int ret, i;
> > +
> > + mic = devm_kzalloc(dev, sizeof(*mic), GFP_KERNEL);
> > + if (!mic) {
> > + DRM_ERROR("mic: Failed to allocate memory for MIC
> > object\n");
> > + ret = -ENOMEM;
> > + goto err;
> > + }
> > +
> > + mic->dev = dev;
> > +
> > + ret = parse_dt(mic);
> > + if (ret)
> > + goto err;
> > +
> > + ret = of_address_to_resource(dev->of_node, 0, &res);
> > + if (ret) {
> > + DRM_ERROR("mic: Failed to get mem region for
> > MIC\n");
> > + goto err;
> > + }
> > + mic->reg = devm_ioremap(dev, res.start,
> > resource_size(&res));
> > + if (!mic->reg) {
> > + DRM_ERROR("mic: Failed to remap for MIC\n");
> > + ret = -ENOMEM;
> > + goto err;
> > + }
> > +
> > + ret = of_address_to_resource(dev->of_node, 1, &res);
> > + if (ret) {
> > + DRM_ERROR("mic: Failed to get mem region for
> > MIC\n");
> > + goto err;
> > + }
> > + mic->sysreg = devm_ioremap(dev, res.start,
> > resource_size(&res));
>
> Consider to use syscon framework to access system registers.
>
Yes. I will investigate that more and use that if it is possible.
> > + if (!mic->sysreg) {
> > + DRM_ERROR("mic: Failed to remap for MIC\n");
> > + goto err;
> > + }
> > +
> > + mic->bridge.funcs = &mic_bridge_funcs;
> > + mic->bridge.of_node = dev->of_node;
> > + mic->bridge.driver_private = mic;
> > + ret = drm_bridge_add(&mic->bridge);
> > + if (ret) {
> > + DRM_ERROR("mic: Failed to add MIC to the global
> > bridge list\n");
> > + goto err;
> > + }
> > +
> > + for (i = 0; i < NUM_CLKS; i++) {
> > + mic->clks[i] = of_clk_get_by_name(dev->of_node,
> > clk_names[i]);
> > + if (IS_ERR(mic->clks[i])) {
> > + DRM_ERROR("mic: Failed to get clock
> > (%s)\n",
> > +
> > clk_names[i]);
> > + ret = PTR_ERR(mic->clks[i]);
> > + goto err;
> > + }
> > + }
> > +
> > + DRM_INFO("MIC has been probed\n");
>
> Use DRM_DEBUG_KMS instead.
>
That would be better.
Thanks for your review.
Best regards,
Hyungwon Hwang
> Thanks,
> Inki Dae
>
> > +
> > +err:
> > + return ret;
> > +}
> > +
> > +static int exynos_mic_remove(struct platform_device *pdev)
> > +{
> > + struct exynos_mic *mic = platform_get_drvdata(pdev);
> > + int i;
> > +
> > + drm_bridge_remove(&mic->bridge);
> > +
> > + for (i = NUM_CLKS - 1; i > -1; i--)
> > + clk_put(mic->clks[i]);
> > +
> > + return 0;
> > +}
> > +
> > +static const struct of_device_id exynos_mic_of_match[] = {
> > + { .compatible = "samsung,exynos5433-mic" },
> > + { }
> > +};
> > +MODULE_DEVICE_TABLE(of, exynos_mic_of_match);
> > +
> > +struct platform_driver mic_driver = {
> > + .probe = exynos_mic_probe,
> > + .remove = exynos_mic_remove,
> > + .driver = {
> > + .name = "exynos-mic",
> > + .owner = THIS_MODULE,
> > + .of_match_table = exynos_mic_of_match,
> > + },
> > +};
> > --
> > 1.9.1
> >
> >
>
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