[v5,1/6] drm/bridge/synopsys: dsi: driver-specific configuration of phy timings
diff mbox series

Message ID 20191209143130.4553-2-heiko@sntech.de
State New
Headers show
Series
  • drm/rockchip: px30 dsi support
Related show

Commit Message

Heiko Stuebner Dec. 9, 2019, 2:31 p.m. UTC
From: Heiko Stuebner <heiko.stuebner@theobroma-systems.com>

The timing values for dw-dsi are often dependent on the used display and
according to Philippe Cornu will most likely also depend on the used phy
technology in the soc-specific implementation.

To solve this and allow specific implementations to define them as needed
add a new get_timing callback to phy_ops and call this from the dphy_timing
function to retrieve the necessary values for the specific mode.

Right now this handles the hs2lp + lp2hs where Rockchip SoCs need handling
according to the phy speed, while STM seems to be ok with static values.

changes in v5:
- rebase on 5.5-rc1
- merge into px30 dsi series to prevent ordering conflicts

changes in v4:
- rebase to make it directly fit on top of drm-misc-next after all

changes in v3:
- check existence of phy_ops->get_timing in __dw_mipi_dsi_probe()
- emit actual error when get_timing() call fails
- add tags from Philippe and Yannick

changes in v2:
- add driver-specific handling, don't force all bridge users to use
  the same timings, as suggested by Philippe

Suggested-by: Philippe Cornu <philippe.cornu@st.com>
Signed-off-by: Heiko Stuebner <heiko.stuebner@theobroma-systems.com>
Reviewed-by: Philippe Cornu <philippe.cornu@st.com>
Tested-by: Yannick Fertre <yannick.fertre@st.com>
---
 drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c | 27 +++++--
 drivers/gpu/drm/rockchip/Kconfig              |  1 +
 .../gpu/drm/rockchip/dw-mipi-dsi-rockchip.c   | 78 +++++++++++++++++++
 drivers/gpu/drm/stm/dw_mipi_dsi-stm.c         | 13 ++++
 include/drm/bridge/dw_mipi_dsi.h              |  9 +++
 5 files changed, 121 insertions(+), 7 deletions(-)

Comments

Neil Armstrong Dec. 16, 2019, 10:37 a.m. UTC | #1
On 09/12/2019 15:31, Heiko Stuebner wrote:
> From: Heiko Stuebner <heiko.stuebner@theobroma-systems.com>
> 
> The timing values for dw-dsi are often dependent on the used display and
> according to Philippe Cornu will most likely also depend on the used phy
> technology in the soc-specific implementation.
> 
> To solve this and allow specific implementations to define them as needed
> add a new get_timing callback to phy_ops and call this from the dphy_timing
> function to retrieve the necessary values for the specific mode.
> 
> Right now this handles the hs2lp + lp2hs where Rockchip SoCs need handling
> according to the phy speed, while STM seems to be ok with static values.
> 
> changes in v5:
> - rebase on 5.5-rc1
> - merge into px30 dsi series to prevent ordering conflicts
> 
> changes in v4:
> - rebase to make it directly fit on top of drm-misc-next after all
> 
> changes in v3:
> - check existence of phy_ops->get_timing in __dw_mipi_dsi_probe()
> - emit actual error when get_timing() call fails
> - add tags from Philippe and Yannick
> 
> changes in v2:
> - add driver-specific handling, don't force all bridge users to use
>   the same timings, as suggested by Philippe
> 
> Suggested-by: Philippe Cornu <philippe.cornu@st.com>
> Signed-off-by: Heiko Stuebner <heiko.stuebner@theobroma-systems.com>
> Reviewed-by: Philippe Cornu <philippe.cornu@st.com>
> Tested-by: Yannick Fertre <yannick.fertre@st.com>
> ---
>  drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c | 27 +++++--
>  drivers/gpu/drm/rockchip/Kconfig              |  1 +
>  .../gpu/drm/rockchip/dw-mipi-dsi-rockchip.c   | 78 +++++++++++++++++++
>  drivers/gpu/drm/stm/dw_mipi_dsi-stm.c         | 13 ++++
>  include/drm/bridge/dw_mipi_dsi.h              |  9 +++
>  5 files changed, 121 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c b/drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c
> index b6e793bb653c..bfe0061e54a2 100644
> --- a/drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c
> +++ b/drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c
> @@ -719,7 +719,15 @@ static void dw_mipi_dsi_vertical_timing_config(struct dw_mipi_dsi *dsi,
>  
>  static void dw_mipi_dsi_dphy_timing_config(struct dw_mipi_dsi *dsi)
>  {
> +	const struct dw_mipi_dsi_phy_ops *phy_ops = dsi->plat_data->phy_ops;
> +	struct dw_mipi_dsi_dphy_timing timing;
>  	u32 hw_version;
> +	int ret;
> +
> +	ret = phy_ops->get_timing(dsi->plat_data->priv_data,
> +				  dsi->lane_mbps, &timing);
> +	if (ret)
> +		DRM_DEV_ERROR(dsi->dev, "Retrieving phy timings failed\n");
>  
>  	/*
>  	 * TODO dw drv improvements
> @@ -732,16 +740,20 @@ static void dw_mipi_dsi_dphy_timing_config(struct dw_mipi_dsi *dsi)
>  	hw_version = dsi_read(dsi, DSI_VERSION) & VERSION;
>  
>  	if (hw_version >= HWVER_131) {
> -		dsi_write(dsi, DSI_PHY_TMR_CFG, PHY_HS2LP_TIME_V131(0x40) |
> -			  PHY_LP2HS_TIME_V131(0x40));
> +		dsi_write(dsi, DSI_PHY_TMR_CFG,
> +			  PHY_HS2LP_TIME_V131(timing.data_hs2lp) |
> +			  PHY_LP2HS_TIME_V131(timing.data_lp2hs));
>  		dsi_write(dsi, DSI_PHY_TMR_RD_CFG, MAX_RD_TIME_V131(10000));
>  	} else {
> -		dsi_write(dsi, DSI_PHY_TMR_CFG, PHY_HS2LP_TIME(0x40) |
> -			  PHY_LP2HS_TIME(0x40) | MAX_RD_TIME(10000));
> +		dsi_write(dsi, DSI_PHY_TMR_CFG,
> +			  PHY_HS2LP_TIME(timing.data_hs2lp) |
> +			  PHY_LP2HS_TIME(timing.data_lp2hs) |
> +			  MAX_RD_TIME(10000));
>  	}
>  
> -	dsi_write(dsi, DSI_PHY_TMR_LPCLK_CFG, PHY_CLKHS2LP_TIME(0x40)
> -		  | PHY_CLKLP2HS_TIME(0x40));
> +	dsi_write(dsi, DSI_PHY_TMR_LPCLK_CFG,
> +		  PHY_CLKHS2LP_TIME(timing.clk_hs2lp) |
> +		  PHY_CLKLP2HS_TIME(timing.clk_lp2hs));
>  }
>  
>  static void dw_mipi_dsi_dphy_interface_config(struct dw_mipi_dsi *dsi)
> @@ -991,7 +1003,8 @@ __dw_mipi_dsi_probe(struct platform_device *pdev,
>  	dsi->dev = dev;
>  	dsi->plat_data = plat_data;
>  
> -	if (!plat_data->phy_ops->init || !plat_data->phy_ops->get_lane_mbps) {
> +	if (!plat_data->phy_ops->init || !plat_data->phy_ops->get_lane_mbps ||
> +	    !plat_data->phy_ops->get_timing) {
>  		DRM_ERROR("Phy not properly configured\n");
>  		return ERR_PTR(-ENODEV);
>  	}
> diff --git a/drivers/gpu/drm/rockchip/Kconfig b/drivers/gpu/drm/rockchip/Kconfig
> index 6f4222f8beeb..4b7a276994ce 100644
> --- a/drivers/gpu/drm/rockchip/Kconfig
> +++ b/drivers/gpu/drm/rockchip/Kconfig
> @@ -46,6 +46,7 @@ config ROCKCHIP_DW_HDMI
>  
>  config ROCKCHIP_DW_MIPI_DSI
>  	bool "Rockchip specific extensions for Synopsys DW MIPI DSI"
> +	select GENERIC_PHY_MIPI_DPHY
>  	help
>  	  This selects support for Rockchip SoC specific extensions
>  	  for the Synopsys DesignWare HDMI driver. If you want to
> diff --git a/drivers/gpu/drm/rockchip/dw-mipi-dsi-rockchip.c b/drivers/gpu/drm/rockchip/dw-mipi-dsi-rockchip.c
> index bc073ec5c183..9406effe8077 100644
> --- a/drivers/gpu/drm/rockchip/dw-mipi-dsi-rockchip.c
> +++ b/drivers/gpu/drm/rockchip/dw-mipi-dsi-rockchip.c
> @@ -559,9 +559,87 @@ dw_mipi_dsi_get_lane_mbps(void *priv_data, const struct drm_display_mode *mode,
>  	return 0;
>  }
>  
> +struct hstt {
> +	unsigned int maxfreq;
> +	struct dw_mipi_dsi_dphy_timing timing;
> +};
> +
> +#define HSTT(_maxfreq, _c_lp2hs, _c_hs2lp, _d_lp2hs, _d_hs2lp)	\
> +{					\
> +	.maxfreq = _maxfreq,		\
> +	.timing = {			\
> +		.clk_lp2hs = _c_lp2hs,	\
> +		.clk_hs2lp = _c_hs2lp,	\
> +		.data_lp2hs = _d_lp2hs,	\
> +		.data_hs2lp = _d_hs2lp,	\
> +	}				\
> +}
> +
> +/* Table A-3 High-Speed Transition Times */
> +struct hstt hstt_table[] = {
> +	HSTT(  90,  32, 20,  26, 13),
> +	HSTT( 100,  35, 23,  28, 14),
> +	HSTT( 110,  32, 22,  26, 13),
> +	HSTT( 130,  31, 20,  27, 13),
> +	HSTT( 140,  33, 22,  26, 14),
> +	HSTT( 150,  33, 21,  26, 14),
> +	HSTT( 170,  32, 20,  27, 13),
> +	HSTT( 180,  36, 23,  30, 15),
> +	HSTT( 200,  40, 22,  33, 15),
> +	HSTT( 220,  40, 22,  33, 15),
> +	HSTT( 240,  44, 24,  36, 16),
> +	HSTT( 250,  48, 24,  38, 17),
> +	HSTT( 270,  48, 24,  38, 17),
> +	HSTT( 300,  50, 27,  41, 18),
> +	HSTT( 330,  56, 28,  45, 18),
> +	HSTT( 360,  59, 28,  48, 19),
> +	HSTT( 400,  61, 30,  50, 20),
> +	HSTT( 450,  67, 31,  55, 21),
> +	HSTT( 500,  73, 31,  59, 22),
> +	HSTT( 550,  79, 36,  63, 24),
> +	HSTT( 600,  83, 37,  68, 25),
> +	HSTT( 650,  90, 38,  73, 27),
> +	HSTT( 700,  95, 40,  77, 28),
> +	HSTT( 750, 102, 40,  84, 28),
> +	HSTT( 800, 106, 42,  87, 30),
> +	HSTT( 850, 113, 44,  93, 31),
> +	HSTT( 900, 118, 47,  98, 32),
> +	HSTT( 950, 124, 47, 102, 34),
> +	HSTT(1000, 130, 49, 107, 35),
> +	HSTT(1050, 135, 51, 111, 37),
> +	HSTT(1100, 139, 51, 114, 38),
> +	HSTT(1150, 146, 54, 120, 40),
> +	HSTT(1200, 153, 57, 125, 41),
> +	HSTT(1250, 158, 58, 130, 42),
> +	HSTT(1300, 163, 58, 135, 44),
> +	HSTT(1350, 168, 60, 140, 45),
> +	HSTT(1400, 172, 64, 144, 47),
> +	HSTT(1450, 176, 65, 148, 48),
> +	HSTT(1500, 181, 66, 153, 50)
> +};
> +
> +static int
> +dw_mipi_dsi_phy_get_timing(void *priv_data, unsigned int lane_mbps,
> +			   struct dw_mipi_dsi_dphy_timing *timing)
> +{
> +	int i;
> +
> +	for (i = 0; i < ARRAY_SIZE(hstt_table); i++)
> +		if (lane_mbps < hstt_table[i].maxfreq)
> +			break;
> +
> +	if (i == ARRAY_SIZE(hstt_table))
> +		i--;
> +
> +	*timing = hstt_table[i].timing;
> +
> +	return 0;
> +}
> +
>  static const struct dw_mipi_dsi_phy_ops dw_mipi_dsi_rockchip_phy_ops = {
>  	.init = dw_mipi_dsi_phy_init,
>  	.get_lane_mbps = dw_mipi_dsi_get_lane_mbps,
> +	.get_timing = dw_mipi_dsi_phy_get_timing,
>  };
>  
>  static void dw_mipi_dsi_rockchip_config(struct dw_mipi_dsi_rockchip *dsi,
> diff --git a/drivers/gpu/drm/stm/dw_mipi_dsi-stm.c b/drivers/gpu/drm/stm/dw_mipi_dsi-stm.c
> index 514efefb0016..4b165635b2d4 100644
> --- a/drivers/gpu/drm/stm/dw_mipi_dsi-stm.c
> +++ b/drivers/gpu/drm/stm/dw_mipi_dsi-stm.c
> @@ -309,11 +309,24 @@ dw_mipi_dsi_get_lane_mbps(void *priv_data, const struct drm_display_mode *mode,
>  	return 0;
>  }
>  
> +static int
> +dw_mipi_dsi_phy_get_timing(void *priv_data, unsigned int lane_mbps,
> +			   struct dw_mipi_dsi_dphy_timing *timing)
> +{
> +	timing->clk_hs2lp = 0x40;
> +	timing->clk_lp2hs = 0x40;
> +	timing->data_hs2lp = 0x40;
> +	timing->data_lp2hs = 0x40;
> +
> +	return 0;
> +}
> +
>  static const struct dw_mipi_dsi_phy_ops dw_mipi_dsi_stm_phy_ops = {
>  	.init = dw_mipi_dsi_phy_init,
>  	.power_on = dw_mipi_dsi_phy_power_on,
>  	.power_off = dw_mipi_dsi_phy_power_off,
>  	.get_lane_mbps = dw_mipi_dsi_get_lane_mbps,
> +	.get_timing = dw_mipi_dsi_phy_get_timing,
>  };
>  
>  static struct dw_mipi_dsi_plat_data dw_mipi_dsi_stm_plat_data = {
> diff --git a/include/drm/bridge/dw_mipi_dsi.h b/include/drm/bridge/dw_mipi_dsi.h
> index 94cc64a342e1..b0e390b3288e 100644
> --- a/include/drm/bridge/dw_mipi_dsi.h
> +++ b/include/drm/bridge/dw_mipi_dsi.h
> @@ -19,6 +19,13 @@ struct dw_mipi_dsi;
>  struct mipi_dsi_device;
>  struct platform_device;
>  
> +struct dw_mipi_dsi_dphy_timing {
> +	u16 data_hs2lp;
> +	u16 data_lp2hs;
> +	u16 clk_hs2lp;
> +	u16 clk_lp2hs;
> +};
> +
>  struct dw_mipi_dsi_phy_ops {
>  	int (*init)(void *priv_data);
>  	void (*power_on)(void *priv_data);
> @@ -27,6 +34,8 @@ struct dw_mipi_dsi_phy_ops {
>  			     const struct drm_display_mode *mode,
>  			     unsigned long mode_flags, u32 lanes, u32 format,
>  			     unsigned int *lane_mbps);
> +	int (*get_timing)(void *priv_data, unsigned int lane_mbps,
> +			  struct dw_mipi_dsi_dphy_timing *timing);
>  };
>  
>  struct dw_mipi_dsi_host_ops {
> 

Reviewed-by: Neil Armstrong <narmstrong@baylibre.com>

Patch
diff mbox series

diff --git a/drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c b/drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c
index b6e793bb653c..bfe0061e54a2 100644
--- a/drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c
+++ b/drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c
@@ -719,7 +719,15 @@  static void dw_mipi_dsi_vertical_timing_config(struct dw_mipi_dsi *dsi,
 
 static void dw_mipi_dsi_dphy_timing_config(struct dw_mipi_dsi *dsi)
 {
+	const struct dw_mipi_dsi_phy_ops *phy_ops = dsi->plat_data->phy_ops;
+	struct dw_mipi_dsi_dphy_timing timing;
 	u32 hw_version;
+	int ret;
+
+	ret = phy_ops->get_timing(dsi->plat_data->priv_data,
+				  dsi->lane_mbps, &timing);
+	if (ret)
+		DRM_DEV_ERROR(dsi->dev, "Retrieving phy timings failed\n");
 
 	/*
 	 * TODO dw drv improvements
@@ -732,16 +740,20 @@  static void dw_mipi_dsi_dphy_timing_config(struct dw_mipi_dsi *dsi)
 	hw_version = dsi_read(dsi, DSI_VERSION) & VERSION;
 
 	if (hw_version >= HWVER_131) {
-		dsi_write(dsi, DSI_PHY_TMR_CFG, PHY_HS2LP_TIME_V131(0x40) |
-			  PHY_LP2HS_TIME_V131(0x40));
+		dsi_write(dsi, DSI_PHY_TMR_CFG,
+			  PHY_HS2LP_TIME_V131(timing.data_hs2lp) |
+			  PHY_LP2HS_TIME_V131(timing.data_lp2hs));
 		dsi_write(dsi, DSI_PHY_TMR_RD_CFG, MAX_RD_TIME_V131(10000));
 	} else {
-		dsi_write(dsi, DSI_PHY_TMR_CFG, PHY_HS2LP_TIME(0x40) |
-			  PHY_LP2HS_TIME(0x40) | MAX_RD_TIME(10000));
+		dsi_write(dsi, DSI_PHY_TMR_CFG,
+			  PHY_HS2LP_TIME(timing.data_hs2lp) |
+			  PHY_LP2HS_TIME(timing.data_lp2hs) |
+			  MAX_RD_TIME(10000));
 	}
 
-	dsi_write(dsi, DSI_PHY_TMR_LPCLK_CFG, PHY_CLKHS2LP_TIME(0x40)
-		  | PHY_CLKLP2HS_TIME(0x40));
+	dsi_write(dsi, DSI_PHY_TMR_LPCLK_CFG,
+		  PHY_CLKHS2LP_TIME(timing.clk_hs2lp) |
+		  PHY_CLKLP2HS_TIME(timing.clk_lp2hs));
 }
 
 static void dw_mipi_dsi_dphy_interface_config(struct dw_mipi_dsi *dsi)
@@ -991,7 +1003,8 @@  __dw_mipi_dsi_probe(struct platform_device *pdev,
 	dsi->dev = dev;
 	dsi->plat_data = plat_data;
 
-	if (!plat_data->phy_ops->init || !plat_data->phy_ops->get_lane_mbps) {
+	if (!plat_data->phy_ops->init || !plat_data->phy_ops->get_lane_mbps ||
+	    !plat_data->phy_ops->get_timing) {
 		DRM_ERROR("Phy not properly configured\n");
 		return ERR_PTR(-ENODEV);
 	}
diff --git a/drivers/gpu/drm/rockchip/Kconfig b/drivers/gpu/drm/rockchip/Kconfig
index 6f4222f8beeb..4b7a276994ce 100644
--- a/drivers/gpu/drm/rockchip/Kconfig
+++ b/drivers/gpu/drm/rockchip/Kconfig
@@ -46,6 +46,7 @@  config ROCKCHIP_DW_HDMI
 
 config ROCKCHIP_DW_MIPI_DSI
 	bool "Rockchip specific extensions for Synopsys DW MIPI DSI"
+	select GENERIC_PHY_MIPI_DPHY
 	help
 	  This selects support for Rockchip SoC specific extensions
 	  for the Synopsys DesignWare HDMI driver. If you want to
diff --git a/drivers/gpu/drm/rockchip/dw-mipi-dsi-rockchip.c b/drivers/gpu/drm/rockchip/dw-mipi-dsi-rockchip.c
index bc073ec5c183..9406effe8077 100644
--- a/drivers/gpu/drm/rockchip/dw-mipi-dsi-rockchip.c
+++ b/drivers/gpu/drm/rockchip/dw-mipi-dsi-rockchip.c
@@ -559,9 +559,87 @@  dw_mipi_dsi_get_lane_mbps(void *priv_data, const struct drm_display_mode *mode,
 	return 0;
 }
 
+struct hstt {
+	unsigned int maxfreq;
+	struct dw_mipi_dsi_dphy_timing timing;
+};
+
+#define HSTT(_maxfreq, _c_lp2hs, _c_hs2lp, _d_lp2hs, _d_hs2lp)	\
+{					\
+	.maxfreq = _maxfreq,		\
+	.timing = {			\
+		.clk_lp2hs = _c_lp2hs,	\
+		.clk_hs2lp = _c_hs2lp,	\
+		.data_lp2hs = _d_lp2hs,	\
+		.data_hs2lp = _d_hs2lp,	\
+	}				\
+}
+
+/* Table A-3 High-Speed Transition Times */
+struct hstt hstt_table[] = {
+	HSTT(  90,  32, 20,  26, 13),
+	HSTT( 100,  35, 23,  28, 14),
+	HSTT( 110,  32, 22,  26, 13),
+	HSTT( 130,  31, 20,  27, 13),
+	HSTT( 140,  33, 22,  26, 14),
+	HSTT( 150,  33, 21,  26, 14),
+	HSTT( 170,  32, 20,  27, 13),
+	HSTT( 180,  36, 23,  30, 15),
+	HSTT( 200,  40, 22,  33, 15),
+	HSTT( 220,  40, 22,  33, 15),
+	HSTT( 240,  44, 24,  36, 16),
+	HSTT( 250,  48, 24,  38, 17),
+	HSTT( 270,  48, 24,  38, 17),
+	HSTT( 300,  50, 27,  41, 18),
+	HSTT( 330,  56, 28,  45, 18),
+	HSTT( 360,  59, 28,  48, 19),
+	HSTT( 400,  61, 30,  50, 20),
+	HSTT( 450,  67, 31,  55, 21),
+	HSTT( 500,  73, 31,  59, 22),
+	HSTT( 550,  79, 36,  63, 24),
+	HSTT( 600,  83, 37,  68, 25),
+	HSTT( 650,  90, 38,  73, 27),
+	HSTT( 700,  95, 40,  77, 28),
+	HSTT( 750, 102, 40,  84, 28),
+	HSTT( 800, 106, 42,  87, 30),
+	HSTT( 850, 113, 44,  93, 31),
+	HSTT( 900, 118, 47,  98, 32),
+	HSTT( 950, 124, 47, 102, 34),
+	HSTT(1000, 130, 49, 107, 35),
+	HSTT(1050, 135, 51, 111, 37),
+	HSTT(1100, 139, 51, 114, 38),
+	HSTT(1150, 146, 54, 120, 40),
+	HSTT(1200, 153, 57, 125, 41),
+	HSTT(1250, 158, 58, 130, 42),
+	HSTT(1300, 163, 58, 135, 44),
+	HSTT(1350, 168, 60, 140, 45),
+	HSTT(1400, 172, 64, 144, 47),
+	HSTT(1450, 176, 65, 148, 48),
+	HSTT(1500, 181, 66, 153, 50)
+};
+
+static int
+dw_mipi_dsi_phy_get_timing(void *priv_data, unsigned int lane_mbps,
+			   struct dw_mipi_dsi_dphy_timing *timing)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(hstt_table); i++)
+		if (lane_mbps < hstt_table[i].maxfreq)
+			break;
+
+	if (i == ARRAY_SIZE(hstt_table))
+		i--;
+
+	*timing = hstt_table[i].timing;
+
+	return 0;
+}
+
 static const struct dw_mipi_dsi_phy_ops dw_mipi_dsi_rockchip_phy_ops = {
 	.init = dw_mipi_dsi_phy_init,
 	.get_lane_mbps = dw_mipi_dsi_get_lane_mbps,
+	.get_timing = dw_mipi_dsi_phy_get_timing,
 };
 
 static void dw_mipi_dsi_rockchip_config(struct dw_mipi_dsi_rockchip *dsi,
diff --git a/drivers/gpu/drm/stm/dw_mipi_dsi-stm.c b/drivers/gpu/drm/stm/dw_mipi_dsi-stm.c
index 514efefb0016..4b165635b2d4 100644
--- a/drivers/gpu/drm/stm/dw_mipi_dsi-stm.c
+++ b/drivers/gpu/drm/stm/dw_mipi_dsi-stm.c
@@ -309,11 +309,24 @@  dw_mipi_dsi_get_lane_mbps(void *priv_data, const struct drm_display_mode *mode,
 	return 0;
 }
 
+static int
+dw_mipi_dsi_phy_get_timing(void *priv_data, unsigned int lane_mbps,
+			   struct dw_mipi_dsi_dphy_timing *timing)
+{
+	timing->clk_hs2lp = 0x40;
+	timing->clk_lp2hs = 0x40;
+	timing->data_hs2lp = 0x40;
+	timing->data_lp2hs = 0x40;
+
+	return 0;
+}
+
 static const struct dw_mipi_dsi_phy_ops dw_mipi_dsi_stm_phy_ops = {
 	.init = dw_mipi_dsi_phy_init,
 	.power_on = dw_mipi_dsi_phy_power_on,
 	.power_off = dw_mipi_dsi_phy_power_off,
 	.get_lane_mbps = dw_mipi_dsi_get_lane_mbps,
+	.get_timing = dw_mipi_dsi_phy_get_timing,
 };
 
 static struct dw_mipi_dsi_plat_data dw_mipi_dsi_stm_plat_data = {
diff --git a/include/drm/bridge/dw_mipi_dsi.h b/include/drm/bridge/dw_mipi_dsi.h
index 94cc64a342e1..b0e390b3288e 100644
--- a/include/drm/bridge/dw_mipi_dsi.h
+++ b/include/drm/bridge/dw_mipi_dsi.h
@@ -19,6 +19,13 @@  struct dw_mipi_dsi;
 struct mipi_dsi_device;
 struct platform_device;
 
+struct dw_mipi_dsi_dphy_timing {
+	u16 data_hs2lp;
+	u16 data_lp2hs;
+	u16 clk_hs2lp;
+	u16 clk_lp2hs;
+};
+
 struct dw_mipi_dsi_phy_ops {
 	int (*init)(void *priv_data);
 	void (*power_on)(void *priv_data);
@@ -27,6 +34,8 @@  struct dw_mipi_dsi_phy_ops {
 			     const struct drm_display_mode *mode,
 			     unsigned long mode_flags, u32 lanes, u32 format,
 			     unsigned int *lane_mbps);
+	int (*get_timing)(void *priv_data, unsigned int lane_mbps,
+			  struct dw_mipi_dsi_dphy_timing *timing);
 };
 
 struct dw_mipi_dsi_host_ops {