Re: [PATCH v4 7/8] drm/mediatek: add mipi panel support

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Hi, YT:

Some comments inline.

On Fri, 2016-07-15 at 18:07 +0800, YT Shen wrote:
> From: shaoming chen <shaoming.chen@xxxxxxxxxxxx>
> 
> add dsi and mipi tx driver for mipi panel support
> 
> Signed-off-by: shaoming chen <shaoming.chen@xxxxxxxxxxxx>
> ---
>  drivers/gpu/drm/mediatek/mtk_dsi.c     |  169 ++++++++++++++++++++++----------
>  drivers/gpu/drm/mediatek/mtk_mipi_tx.c |   82 +++++++++++-----
>  2 files changed, 173 insertions(+), 78 deletions(-)
> 
> diff --git a/drivers/gpu/drm/mediatek/mtk_dsi.c b/drivers/gpu/drm/mediatek/mtk_dsi.c
> index 1f99894..4eae63c 100644
> --- a/drivers/gpu/drm/mediatek/mtk_dsi.c
> +++ b/drivers/gpu/drm/mediatek/mtk_dsi.c
> @@ -29,9 +29,6 @@
>  
>  #include "mtk_drm_ddp_comp.h"
>  
> -#define DSI_VIDEO_FIFO_DEPTH	(1920 / 4)
> -#define DSI_HOST_FIFO_DEPTH	64
> -

I think this should be moved to a 'cleaning up and refine' patch.

>  #define DSI_START		0x00
>  
>  #define DSI_INTEN		0x08
> @@ -55,7 +52,7 @@
>  #define MIX_MODE			BIT(17)
>  
>  #define DSI_TXRX_CTRL		0x18
> -#define VC_NUM				(2 << 0)
> +#define VC_NUM				BIT(1)

I think this should be moved to a 'cleaning up and refine' patch.

>  #define LANE_NUM			(0xf << 2)
>  #define DIS_EOT				BIT(6)
>  #define NULL_EN				BIT(7)
> @@ -94,6 +91,8 @@
>  #define DSI_RACK		0x84
>  #define RACK			BIT(0)
>  
> +#define DSI_MEM_CONTI		0x90
> +
>  #define DSI_PHY_LCCON		0x104
>  #define LC_HS_TX_EN			BIT(0)
>  #define LC_ULPM_EN			BIT(1)
> @@ -126,6 +125,10 @@
>  #define CLK_HS_POST			(0xff << 8)
>  #define CLK_HS_EXIT			(0xff << 16)
>  
> +#define DSI_VM_CMD_CON		0x130
> +#define VM_CMD_EN		BIT(0)
> +#define TS_VFP_EN		BIT(5)

The bitwise definition should add one more tab to align other bitwise
definition in this file.

> +
>  #define DSI_CMDQ0		0x180
>  
>  #define NS_TO_CYCLE(n, c)    ((n) / (c) + (((n) % (c)) ? 1 : 0))
> @@ -239,11 +242,11 @@ static void mtk_dsi_mask(struct mtk_dsi *dsi, u32 offset, u32 mask, u32 data)
>  	writel((temp & ~mask) | (data & mask), dsi->regs + offset);
>  }
>  
> -static void dsi_phy_timconfig(struct mtk_dsi *dsi)
> +static void mtk_dsi_phy_timconfig(struct mtk_dsi *dsi)

I think this should be moved to a 'cleaning up and refine' patch.

>  {
>  	u32 timcon0, timcon1, timcon2, timcon3;
> -	unsigned int ui, cycle_time;
> -	unsigned int lpx;
> +	u32 ui, cycle_time;
> +	u32 lpx;

I think this should be moved to a 'cleaning up and refine' patch.

>  
>  	ui = 1000 / dsi->data_rate + 0x01;
>  	cycle_time = 8000 / dsi->data_rate + 0x01;
> @@ -273,7 +276,7 @@ static void mtk_dsi_disable(struct mtk_dsi *dsi)
>  	mtk_dsi_mask(dsi, DSI_CON_CTRL, DSI_EN, 0);
>  }
>  
> -static void mtk_dsi_reset(struct mtk_dsi *dsi)
> +static void mtk_dsi_reset_engine(struct mtk_dsi *dsi)
>  {
>  	mtk_dsi_mask(dsi, DSI_CON_CTRL, DSI_RESET, DSI_RESET);
>  	mtk_dsi_mask(dsi, DSI_CON_CTRL, DSI_RESET, 0);
> @@ -293,7 +296,9 @@ static int mtk_dsi_poweron(struct mtk_dsi *dsi)
>  	 * mipi_ratio is mipi clk coefficient for balance the pixel clk in mipi.
>  	 * we set mipi_ratio is 1.05.
>  	 */
> -	dsi->data_rate = dsi->vm.pixelclock * 3 * 21 / (1 * 1000 * 10);
> +	dsi->data_rate = dsi->vm.pixelclock * 12 * 21;
> +	dsi->data_rate /= (dsi->lanes * 1000 * 10);
> +	dev_info(dev, "set mipitx's data rate: %dMHz\n", dsi->data_rate);
>  
>  	ret = clk_set_rate(dsi->hs_clk, dsi->data_rate * 1000000);
>  	if (ret < 0) {
> @@ -315,10 +320,6 @@ static int mtk_dsi_poweron(struct mtk_dsi *dsi)
>  		goto err_disable_engine_clk;
>  	}
>  
> -	mtk_dsi_enable(dsi);
> -	mtk_dsi_reset(dsi);
> -	dsi_phy_timconfig(dsi);
> -
>  	return 0;
>  
>  err_disable_engine_clk:
> @@ -330,33 +331,33 @@ err_refcount:
>  	return ret;
>  }
>  
> -static void dsi_clk_ulp_mode_enter(struct mtk_dsi *dsi)
> +static void mtk_dsi_clk_ulp_mode_enter(struct mtk_dsi *dsi)

I think this should be moved to a 'cleaning up and refine' patch.

>  {
>  	mtk_dsi_mask(dsi, DSI_PHY_LCCON, LC_HS_TX_EN, 0);
> -	mtk_dsi_mask(dsi, DSI_PHY_LCCON, LC_ULPM_EN, 0);
> +	mtk_dsi_mask(dsi, DSI_PHY_LCCON, LC_ULPM_EN, LC_ULPM_EN);
>  }
>  
> -static void dsi_clk_ulp_mode_leave(struct mtk_dsi *dsi)
> +static void mtk_dsi_clk_ulp_mode_leave(struct mtk_dsi *dsi)

I think this should be moved to a 'cleaning up and refine' patch.

>  {
>  	mtk_dsi_mask(dsi, DSI_PHY_LCCON, LC_ULPM_EN, 0);
>  	mtk_dsi_mask(dsi, DSI_PHY_LCCON, LC_WAKEUP_EN, LC_WAKEUP_EN);
>  	mtk_dsi_mask(dsi, DSI_PHY_LCCON, LC_WAKEUP_EN, 0);
>  }
>  
> -static void dsi_lane0_ulp_mode_enter(struct mtk_dsi *dsi)
> +static void mtk_dsi_lane0_ulp_mode_enter(struct mtk_dsi *dsi)

I think this should be moved to a 'cleaning up and refine' patch.

>  {
>  	mtk_dsi_mask(dsi, DSI_PHY_LD0CON, LD0_HS_TX_EN, 0);
> -	mtk_dsi_mask(dsi, DSI_PHY_LD0CON, LD0_ULPM_EN, 0);
> +	mtk_dsi_mask(dsi, DSI_PHY_LD0CON, LD0_ULPM_EN, LD0_ULPM_EN);
>  }
>  
> -static void dsi_lane0_ulp_mode_leave(struct mtk_dsi *dsi)
> +static void mtk_dsi_lane0_ulp_mode_leave(struct mtk_dsi *dsi)
>  {
>  	mtk_dsi_mask(dsi, DSI_PHY_LD0CON, LD0_ULPM_EN, 0);
>  	mtk_dsi_mask(dsi, DSI_PHY_LD0CON, LD0_WAKEUP_EN, LD0_WAKEUP_EN);
>  	mtk_dsi_mask(dsi, DSI_PHY_LD0CON, LD0_WAKEUP_EN, 0);
>  }
>  
> -static bool dsi_clk_hs_state(struct mtk_dsi *dsi)
> +static bool mtk_dsi_clk_hs_state(struct mtk_dsi *dsi)

I think this should be moved to a 'cleaning up and refine' patch.

>  {
>  	u32 tmp_reg1;
>  
> @@ -364,15 +365,15 @@ static bool dsi_clk_hs_state(struct mtk_dsi *dsi)
>  	return ((tmp_reg1 & LC_HS_TX_EN) == 1) ? true : false;
>  }
>  
> -static void dsi_clk_hs_mode(struct mtk_dsi *dsi, bool enter)
> +static void mtk_dsi_clk_hs_mode(struct mtk_dsi *dsi, bool enter)

I think this should be moved to a 'cleaning up and refine' patch.

>  {
> -	if (enter && !dsi_clk_hs_state(dsi))
> +	if (enter && !mtk_dsi_clk_hs_state(dsi))
>  		mtk_dsi_mask(dsi, DSI_PHY_LCCON, LC_HS_TX_EN, LC_HS_TX_EN);
> -	else if (!enter && dsi_clk_hs_state(dsi))
> +	else if (!enter && mtk_dsi_clk_hs_state(dsi))
>  		mtk_dsi_mask(dsi, DSI_PHY_LCCON, LC_HS_TX_EN, 0);
>  }
>  
> -static void dsi_set_mode(struct mtk_dsi *dsi)
> +static void mtk_dsi_set_mode(struct mtk_dsi *dsi)

I think this should be moved to a 'cleaning up and refine' patch.

>  {
>  	u32 vid_mode = CMD_MODE;
>  
> @@ -382,12 +383,22 @@ static void dsi_set_mode(struct mtk_dsi *dsi)
>  		if ((dsi->mode_flags & MIPI_DSI_MODE_VIDEO_BURST) &&
>  		    !(dsi->mode_flags & MIPI_DSI_MODE_VIDEO_SYNC_PULSE))
>  			vid_mode = BURST_MODE;
> +		else
> +			vid_mode = SYNC_EVENT_MODE;
>  	}
>  
>  	writel(vid_mode, dsi->regs + DSI_MODE_CTRL);
>  }
>  
> -static void dsi_ps_control_vact(struct mtk_dsi *dsi)
> +static void mtk_dsi_set_vm_cmd(struct mtk_dsi *dsi)
> +{
> +	writel(0x3c, dsi->regs + DSI_MEM_CONTI);
> +
> +	mtk_dsi_mask(dsi, DSI_VM_CMD_CON, VM_CMD_EN, VM_CMD_EN);
> +	mtk_dsi_mask(dsi, DSI_VM_CMD_CON, TS_VFP_EN, TS_VFP_EN);
> +}
> +
> +static void mtk_dsi_ps_control_vact(struct mtk_dsi *dsi)
>  {
>  	struct videomode *vm = &dsi->vm;
>  	u32 dsi_buf_bpp, ps_wc;
> @@ -421,7 +432,7 @@ static void dsi_ps_control_vact(struct mtk_dsi *dsi)
>  	writel(ps_wc, dsi->regs + DSI_HSTX_CKL_WC);
>  }
>  
> -static void dsi_rxtx_control(struct mtk_dsi *dsi)
> +static void mtk_dsi_rxtx_control(struct mtk_dsi *dsi)

I think this should be moved to a 'cleaning up and refine' patch.

>  {
>  	u32 tmp_reg;
>  
> @@ -443,12 +454,15 @@ static void dsi_rxtx_control(struct mtk_dsi *dsi)
>  		break;
>  	}
>  
> +	tmp_reg |= (dsi->mode_flags & MIPI_DSI_CLOCK_NON_CONTINUOUS) << 6;
> +	tmp_reg |= (dsi->mode_flags & MIPI_DSI_MODE_EOT_PACKET) >> 3;
> +
>  	writel(tmp_reg, dsi->regs + DSI_TXRX_CTRL);
>  }
>  
> -static void dsi_ps_control(struct mtk_dsi *dsi)
> +static void mtk_dsi_ps_control(struct mtk_dsi *dsi)

I think this should be moved to a 'cleaning up and refine' patch.

>  {
> -	unsigned int dsi_tmp_buf_bpp;
> +	u32 dsi_tmp_buf_bpp;
>  	u32 tmp_reg;
>  
>  	switch (dsi->format) {
> @@ -478,12 +492,12 @@ static void dsi_ps_control(struct mtk_dsi *dsi)
>  	writel(tmp_reg, dsi->regs + DSI_PSCTRL);
>  }
>  
> -static void dsi_config_vdo_timing(struct mtk_dsi *dsi)
> +static void mtk_dsi_config_vdo_timing(struct mtk_dsi *dsi)

I think this should be moved to a 'cleaning up and refine' patch.

>  {
> -	unsigned int horizontal_sync_active_byte;
> -	unsigned int horizontal_backporch_byte;
> -	unsigned int horizontal_frontporch_byte;
> -	unsigned int dsi_tmp_buf_bpp;
> +	u32 horizontal_sync_active_byte;
> +	u32 horizontal_backporch_byte;
> +	u32 horizontal_frontporch_byte;
> +	u32 dsi_tmp_buf_bpp;

I think this should be moved to a 'cleaning up and refine' patch.

>  
>  	struct videomode *vm = &dsi->vm;
>  
> @@ -512,7 +526,7 @@ static void dsi_config_vdo_timing(struct mtk_dsi *dsi)
>  	writel(horizontal_backporch_byte, dsi->regs + DSI_HBP_WC);
>  	writel(horizontal_frontporch_byte, dsi->regs + DSI_HFP_WC);
>  
> -	dsi_ps_control(dsi);
> +	mtk_dsi_ps_control(dsi);
>  }
>  
>  static void mtk_dsi_start(struct mtk_dsi *dsi)
> @@ -521,6 +535,19 @@ static void mtk_dsi_start(struct mtk_dsi *dsi)
>  	writel(1, dsi->regs + DSI_START);
>  }
>  
> +static void mtk_dsi_stop(struct mtk_dsi *dsi)
> +{
> +	writel(0, dsi->regs + DSI_START);
> +}
> +
> +static void mtk_dsi_set_cmd_mode(struct mtk_dsi *dsi)
> +{
> +	u32 tmp_reg1;
> +
> +	tmp_reg1 = CMD_MODE;
> +	writel(tmp_reg1, dsi->regs + DSI_MODE_CTRL);
> +}
> +
>  static void mtk_dsi_set_interrupt_enable(struct mtk_dsi *dsi)
>  {
>  	u32 inten = DSI_INT_ALL_BITS;
> @@ -609,6 +636,21 @@ static s32 mtk_dsi_wait_for_irq_timeout(struct mtk_dsi *dsi, u32 irq_bit,
>  	return -1;
>  }
>  
> +static void mtk_dsi_switch_to_cmd_mode(struct mtk_dsi *dsi)
> +{
> +	s32 ret = 0;
> +
> +	mtk_dsi_set_cmd_mode(dsi);
> +
> +	ret = mtk_dsi_wait_for_irq_timeout(dsi, DSI_INT_VM_DONE_FLAG, 500);
> +	if (ret != 0) {
> +		dev_info(dsi->dev, "dsi wait engine idle timeout\n");
> +
> +		mtk_dsi_enable(dsi);
> +		mtk_dsi_reset_engine(dsi);
> +	}
> +}
> +
>  static void mtk_dsi_poweroff(struct mtk_dsi *dsi)
>  {
>  	if (WARN_ON(dsi->refcount == 0))
> @@ -617,8 +659,19 @@ static void mtk_dsi_poweroff(struct mtk_dsi *dsi)
>  	if (--dsi->refcount != 0)
>  		return;
>  
> -	dsi_lane0_ulp_mode_enter(dsi);
> -	dsi_clk_ulp_mode_enter(dsi);
> +	mtk_dsi_switch_to_cmd_mode(dsi);
> +
> +	if (dsi->panel) {
> +		if (drm_panel_unprepare(dsi->panel)) {
> +			DRM_ERROR("failed to unprepare the panel\n");
> +			return;
> +		}
> +	}
> +
> +	mtk_dsi_reset_engine(dsi);
> +
> +	mtk_dsi_lane0_ulp_mode_enter(dsi);
> +	mtk_dsi_clk_ulp_mode_enter(dsi);
>  
>  	mtk_dsi_disable(dsi);
>  
> @@ -635,32 +688,40 @@ static void mtk_output_dsi_enable(struct mtk_dsi *dsi)
>  	if (dsi->enabled)
>  		return;
>  
> -	if (dsi->panel) {
> -		if (drm_panel_prepare(dsi->panel)) {
> -			DRM_ERROR("failed to setup the panel\n");
> -			return;
> -		}
> -	}
> -
>  	ret = mtk_dsi_poweron(dsi);
>  	if (ret < 0) {
>  		DRM_ERROR("failed to power on dsi\n");
>  		return;
>  	}
>  
> -	dsi_rxtx_control(dsi);
> +	usleep_range(20000, 21000);
>  
> -	dsi_clk_ulp_mode_leave(dsi);
> -	dsi_lane0_ulp_mode_leave(dsi);
> -	dsi_clk_hs_mode(dsi, 0);
> -	dsi_set_mode(dsi);
> -
> -	dsi_ps_control_vact(dsi);
> -	dsi_config_vdo_timing(dsi);
> +	mtk_dsi_rxtx_control(dsi);
> +	mtk_dsi_phy_timconfig(dsi);
> +	mtk_dsi_ps_control_vact(dsi);
> +	mtk_dsi_set_vm_cmd(dsi);
> +	mtk_dsi_config_vdo_timing(dsi);
>  	mtk_dsi_set_interrupt_enable(dsi);
>  
> -	dsi_set_mode(dsi);
> -	dsi_clk_hs_mode(dsi, 1);
> +	mtk_dsi_enable(dsi);
> +	mtk_dsi_clk_ulp_mode_leave(dsi);
> +	mtk_dsi_lane0_ulp_mode_leave(dsi);
> +	mtk_dsi_clk_hs_mode(dsi, 0);
> +
> +	if (dsi->panel) {
> +		if (drm_panel_prepare(dsi->panel)) {
> +			DRM_ERROR("failed to prepare the panel\n");
> +			return;
> +		}
> +
> +		if (drm_panel_enable(dsi->panel)) {
> +			DRM_ERROR("failed to enable the panel\n");
> +			return;
> +		}
> +	}
> +
> +	mtk_dsi_set_mode(dsi);
> +	mtk_dsi_clk_hs_mode(dsi, 1);
>  
>  	mtk_dsi_start(dsi);
>  
> @@ -679,6 +740,7 @@ static void mtk_output_dsi_disable(struct mtk_dsi *dsi)
>  		}
>  	}
>  
> +	mtk_dsi_stop(dsi);
>  	mtk_dsi_poweroff(dsi);
>  
>  	dsi->enabled = false;
> @@ -1351,6 +1413,7 @@ static int mtk_dsi_remove(struct platform_device *pdev)
>  }
>  
>  static const struct of_device_id mtk_dsi_of_match[] = {
> +	{ .compatible = "mediatek,mt2701-dsi" },

This is not related to 'mipi panel support'. So move this modification
to another patch.

>  	{ .compatible = "mediatek,mt8173-dsi" },
>  	{ },
>  };
> diff --git a/drivers/gpu/drm/mediatek/mtk_mipi_tx.c b/drivers/gpu/drm/mediatek/mtk_mipi_tx.c
> index cf8f38d..3bffc40 100644
> --- a/drivers/gpu/drm/mediatek/mtk_mipi_tx.c
> +++ b/drivers/gpu/drm/mediatek/mtk_mipi_tx.c
> @@ -16,6 +16,7 @@
>  #include <linux/delay.h>
>  #include <linux/io.h>
>  #include <linux/module.h>
> +#include <linux/of_device.h>
>  #include <linux/platform_device.h>
>  #include <linux/phy/phy.h>
>  
> @@ -87,6 +88,9 @@
>  
>  #define MIPITX_DSI_PLL_CON2	0x58
>  
> +#define MIPITX_DSI_PLL_TOP	0x64
> +#define RG_DSI_MPPLL_PRESERVE		(0xff << 8)
> +
>  #define MIPITX_DSI_PLL_PWR	0x68
>  #define RG_DSI_MPPLL_SDM_PWR_ON		BIT(0)
>  #define RG_DSI_MPPLL_SDM_ISO_EN		BIT(1)
> @@ -123,10 +127,32 @@
>  #define SW_LNT2_HSTX_PRE_OE		BIT(24)
>  #define SW_LNT2_HSTX_OE			BIT(25)
>  
> +struct mtk_mipitx_data {
> +	const u32 data;
> +};
> +
> +static const struct mtk_mipitx_data mt2701_mipitx_data = {
> +	.data = (3 << 8)
> +};
> +
> +static const struct mtk_mipitx_data mt8173_mipitx_data = {
> +	.data = (0 << 8)
> +};
> +
> +static const struct of_device_id mtk_mipi_tx_match[] = {
> +	{ .compatible = "mediatek,mt2701-mipi-tx",
> +	  .data = &mt2701_mipitx_data },
> +	{ .compatible = "mediatek,mt8173-mipi-tx",
> +	  .data = &mt8173_mipitx_data },
> +	{},
> +};

This looks more like 'mt2701 support' rather than 'mipi panel support'.
So move this modification to another patch.

> +
>  struct mtk_mipi_tx {
>  	struct device *dev;
>  	void __iomem *regs;
> -	unsigned int data_rate;
> +	u32 data_rate;
> +	const struct mtk_mipitx_data *driver_data;
> +
>  	struct clk_hw pll_hw;
>  	struct clk *pll;
>  };
> @@ -163,12 +189,14 @@ static void mtk_mipi_tx_update_bits(struct mtk_mipi_tx *mipi_tx, u32 offset,
>  static int mtk_mipi_tx_pll_prepare(struct clk_hw *hw)
>  {
>  	struct mtk_mipi_tx *mipi_tx = mtk_mipi_tx_from_clk_hw(hw);
> -	unsigned int txdiv, txdiv0, txdiv1;
> +	u8 txdiv, txdiv0, txdiv1;
>  	u64 pcw;
>  
>  	dev_dbg(mipi_tx->dev, "prepare: %u Hz\n", mipi_tx->data_rate);
>  
> -	if (mipi_tx->data_rate >= 500000000) {
> +	if (mipi_tx->data_rate > 1250000000) {
> +		return -EINVAL;
> +	} else if (mipi_tx->data_rate >= 500000000) {
>  		txdiv = 1;
>  		txdiv0 = 0;
>  		txdiv1 = 0;
> @@ -192,6 +220,10 @@ static int mtk_mipi_tx_pll_prepare(struct clk_hw *hw)
>  		return -EINVAL;
>  	}
>  
> +	mtk_mipi_tx_update_bits(mipi_tx, MIPITX_DSI_TOP_CON,
> +				RG_DSI_LNT_IMP_CAL_CODE | RG_DSI_LNT_HS_BIAS_EN,
> +				(8 << 4) | RG_DSI_LNT_HS_BIAS_EN);
> +
>  	mtk_mipi_tx_update_bits(mipi_tx, MIPITX_DSI_BG_CON,
>  				RG_DSI_VOUT_MSK |
>  				RG_DSI_BG_CKEN | RG_DSI_BG_CORE_EN,
> @@ -201,24 +233,18 @@ static int mtk_mipi_tx_pll_prepare(struct clk_hw *hw)
>  
>  	usleep_range(30, 100);
>  
> -	mtk_mipi_tx_update_bits(mipi_tx, MIPITX_DSI_TOP_CON,
> -				RG_DSI_LNT_IMP_CAL_CODE | RG_DSI_LNT_HS_BIAS_EN,
> -				(8 << 4) | RG_DSI_LNT_HS_BIAS_EN);
> -
> -	mtk_mipi_tx_set_bits(mipi_tx, MIPITX_DSI_CON,
> -			     RG_DSI_CKG_LDOOUT_EN | RG_DSI_LDOCORE_EN);
> +	mtk_mipi_tx_update_bits(mipi_tx, MIPITX_DSI_CON,
> +				RG_DSI_CKG_LDOOUT_EN | RG_DSI_LDOCORE_EN,
> +				RG_DSI_CKG_LDOOUT_EN | RG_DSI_LDOCORE_EN);
>  
>  	mtk_mipi_tx_update_bits(mipi_tx, MIPITX_DSI_PLL_PWR,
>  				RG_DSI_MPPLL_SDM_PWR_ON |
>  				RG_DSI_MPPLL_SDM_ISO_EN,
>  				RG_DSI_MPPLL_SDM_PWR_ON);
>  
> -	mtk_mipi_tx_clear_bits(mipi_tx, MIPITX_DSI_PLL_CON0,
> -			       RG_DSI_MPPLL_PLL_EN);
> -
>  	mtk_mipi_tx_update_bits(mipi_tx, MIPITX_DSI_PLL_CON0,
> -				RG_DSI_MPPLL_TXDIV0 | RG_DSI_MPPLL_TXDIV1 |
> -				RG_DSI_MPPLL_PREDIV,
> +				RG_DSI_MPPLL_PREDIV | RG_DSI_MPPLL_TXDIV0 |
> +				RG_DSI_MPPLL_TXDIV1 | RG_DSI_MPPLL_POSDIV,
>  				(txdiv0 << 3) | (txdiv1 << 5));
>  
>  	/*
> @@ -233,15 +259,21 @@ static int mtk_mipi_tx_pll_prepare(struct clk_hw *hw)
>  		      26000000);
>  	writel(pcw, mipi_tx->regs + MIPITX_DSI_PLL_CON2);
>  
> -	mtk_mipi_tx_set_bits(mipi_tx, MIPITX_DSI_PLL_CON1,
> -			     RG_DSI_MPPLL_SDM_FRA_EN);
> +	mtk_mipi_tx_update_bits(mipi_tx, MIPITX_DSI_PLL_CON1,
> +				RG_DSI_MPPLL_SDM_FRA_EN,
> +				RG_DSI_MPPLL_SDM_FRA_EN);
>  
> -	mtk_mipi_tx_set_bits(mipi_tx, MIPITX_DSI_PLL_CON0, RG_DSI_MPPLL_PLL_EN);
> +	mtk_mipi_tx_update_bits(mipi_tx, MIPITX_DSI_PLL_CON0,
> +				RG_DSI_MPPLL_PLL_EN, RG_DSI_MPPLL_PLL_EN);
>  
>  	usleep_range(20, 100);
>  
>  	mtk_mipi_tx_clear_bits(mipi_tx, MIPITX_DSI_PLL_CON1,
> -			       RG_DSI_MPPLL_SDM_SSC_EN);
> +					RG_DSI_MPPLL_SDM_SSC_EN);
> +
> +	mtk_mipi_tx_update_bits(mipi_tx, MIPITX_DSI_PLL_TOP,
> +				RG_DSI_MPPLL_PRESERVE,
> +				mipi_tx->driver_data->data);
>  
>  	return 0;
>  }
> @@ -255,6 +287,10 @@ static void mtk_mipi_tx_pll_unprepare(struct clk_hw *hw)
>  	mtk_mipi_tx_clear_bits(mipi_tx, MIPITX_DSI_PLL_CON0,
>  			       RG_DSI_MPPLL_PLL_EN);
>  
> +	mtk_mipi_tx_update_bits(mipi_tx, MIPITX_DSI_PLL_TOP,
> +				RG_DSI_MPPLL_PRESERVE,
> +				mipi_tx->driver_data->data);
> +
>  	mtk_mipi_tx_update_bits(mipi_tx, MIPITX_DSI_PLL_PWR,
>  				RG_DSI_MPPLL_SDM_ISO_EN |
>  				RG_DSI_MPPLL_SDM_PWR_ON,
> @@ -310,7 +346,7 @@ static const struct clk_ops mtk_mipi_tx_pll_ops = {
>  static int mtk_mipi_tx_power_on_signal(struct phy *phy)
>  {
>  	struct mtk_mipi_tx *mipi_tx = phy_get_drvdata(phy);
> -	unsigned int reg;
> +	u32 reg;

I think this should be moved to a 'cleaning up and refine' patch.

>  
>  	for (reg = MIPITX_DSI_CLOCK_LANE;
>  	     reg <= MIPITX_DSI_DATA_LANE3; reg += 4)
> @@ -341,7 +377,7 @@ static int mtk_mipi_tx_power_on(struct phy *phy)
>  static void mtk_mipi_tx_power_off_signal(struct phy *phy)
>  {
>  	struct mtk_mipi_tx *mipi_tx = phy_get_drvdata(phy);
> -	unsigned int reg;
> +	u32 reg;

I think this should be moved to a 'cleaning up and refine' patch.

>  
>  	mtk_mipi_tx_set_bits(mipi_tx, MIPITX_DSI_TOP_CON,
>  			     RG_DSI_PAD_TIE_LOW_EN);
> @@ -391,6 +427,7 @@ static int mtk_mipi_tx_probe(struct platform_device *pdev)
>  	if (!mipi_tx)
>  		return -ENOMEM;
>  
> +	mipi_tx->driver_data = of_device_get_match_data(dev);
>  	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>  	mipi_tx->regs = devm_ioremap_resource(dev, mem);
>  	if (IS_ERR(mipi_tx->regs)) {
> @@ -448,11 +485,6 @@ static int mtk_mipi_tx_remove(struct platform_device *pdev)
>  	return 0;
>  }
>  
> -static const struct of_device_id mtk_mipi_tx_match[] = {
> -	{ .compatible = "mediatek,mt8173-mipi-tx", },
> -	{},
> -};
> -
>  struct platform_driver mtk_mipi_tx_driver = {
>  	.probe = mtk_mipi_tx_probe,
>  	.remove = mtk_mipi_tx_remove,

Regards,
CK

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