[PATCH v2] drm/bridge: nwl-dsi: Get MIPI DSI controller and PHY ready in ->mode_set()

[PATCH v2] drm/bridge: nwl-dsi: Get MIPI DSI controller and PHY ready in ->mode_set()

[Liu Ying]

Some MIPI DSI panel drivers like 'raydium,rm68200' send
MIPI_DCS_SET_DISPLAY_ON commands in panel_funcs->prepare(), which
requires the MIPI DSI controller and PHY to be ready beforehand.
Without this patch, the nwl-dsi driver gets the MIPI DSI controller
and PHY ready in bridge_funcs->pre_enable(), which happens after
the panel_funcs->prepare(). So, this patch shifts the bridge operation
ealier from bridge_funcs->pre_enable() to bridge_funcs->mode_set().
This way, more MIPI DSI panels can connect to this nwl-dsi bridge.
Care is taken to make sure bridge_funcs->mode_set()/atomic_disable()
are called in pairs, which includes removing a check on unchanged HS
clock rate and forcing a full modeset when only connector's DPMS is
brought out of "Off" status.

Cc: Andrzej Hajda <a.hajda@samsung.com>
Cc: Neil Armstrong <narmstrong@baylibre.com>
Cc: Robert Foss <robert.foss@linaro.org>
Cc: Laurent Pinchart <Laurent.pinchart@ideasonboard.com>
Cc: Jonas Karlman <jonas@kwiboo.se>
Cc: Jernej Skrabec <jernej.skrabec@siol.net>
Cc: David Airlie <airlied@linux.ie>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: Guido Günther <agx@sigxcpu.org>
Cc: Robert Chiras <robert.chiras@nxp.com>
Cc: NXP Linux Team <linux-imx@nxp.com>
Signed-off-by: Liu Ying <victor.liu@nxp.com>
---
v1->v2:
* Fix commit message typo - s/unchange/unchanged/

 drivers/gpu/drm/bridge/nwl-dsi.c | 86 +++++++++++++++++++++-------------------
 1 file changed, 46 insertions(+), 40 deletions(-)

diff --git a/drivers/gpu/drm/bridge/nwl-dsi.c b/drivers/gpu/drm/bridge/nwl-dsi.c
index be6bfc5..229f0b1 100644
--- a/drivers/gpu/drm/bridge/nwl-dsi.c
+++ b/drivers/gpu/drm/bridge/nwl-dsi.c
@@ -21,6 +21,7 @@
 #include <linux/sys_soc.h>
 #include <linux/time64.h>
 
+#include <drm/drm_atomic_state_helper.h>
 #include <drm/drm_bridge.h>
 #include <drm/drm_mipi_dsi.h>
 #include <drm/drm_of.h>
@@ -661,7 +662,7 @@ static irqreturn_t nwl_dsi_irq_handler(int irq, void *data)
 	return IRQ_HANDLED;
 }
 
-static int nwl_dsi_enable(struct nwl_dsi *dsi)
+static int nwl_dsi_mode_set(struct nwl_dsi *dsi)
 {
 	struct device *dev = dsi->dev;
 	union phy_configure_opts *phy_cfg = &dsi->phy_cfg;
@@ -748,7 +749,9 @@ static int nwl_dsi_disable(struct nwl_dsi *dsi)
 	return 0;
 }
 
-static void nwl_dsi_bridge_disable(struct drm_bridge *bridge)
+static void
+nwl_dsi_bridge_atomic_disable(struct drm_bridge *bridge,
+			      struct drm_bridge_state *old_bridge_state)
 {
 	struct nwl_dsi *dsi = bridge_to_dsi(bridge);
 	int ret;
@@ -809,17 +812,6 @@ static int nwl_dsi_get_dphy_params(struct nwl_dsi *dsi,
 	return 0;
 }
 
-static bool nwl_dsi_bridge_mode_fixup(struct drm_bridge *bridge,
-				      const struct drm_display_mode *mode,
-				      struct drm_display_mode *adjusted_mode)
-{
-	/* At least LCDIF + NWL needs active high sync */
-	adjusted_mode->flags |= (DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC);
-	adjusted_mode->flags &= ~(DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC);
-
-	return true;
-}
-
 static enum drm_mode_status
 nwl_dsi_bridge_mode_valid(struct drm_bridge *bridge,
 			  const struct drm_display_info *info,
@@ -837,6 +829,29 @@ nwl_dsi_bridge_mode_valid(struct drm_bridge *bridge,
 	return MODE_OK;
 }
 
+static int nwl_dsi_bridge_atomic_check(struct drm_bridge *bridge,
+				       struct drm_bridge_state *bridge_state,
+				       struct drm_crtc_state *crtc_state,
+				       struct drm_connector_state *conn_state)
+{
+	struct drm_display_mode *adjusted_mode = &crtc_state->adjusted_mode;
+
+	/* At least LCDIF + NWL needs active high sync */
+	adjusted_mode->flags |= (DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC);
+	adjusted_mode->flags &= ~(DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC);
+
+	/*
+	 * Do a full modeset if crtc_state->active is changed to be true.
+	 * This ensures our ->mode_set() is called to get the DSI controller
+	 * and the PHY ready to send DCS commands, when only the connector's
+	 * DPMS is brought out of "Off" status.
+	 */
+	if (crtc_state->active_changed && crtc_state->active)
+		crtc_state->mode_changed = true;
+
+	return 0;
+}
+
 static void
 nwl_dsi_bridge_mode_set(struct drm_bridge *bridge,
 			const struct drm_display_mode *mode,
@@ -852,13 +867,6 @@ nwl_dsi_bridge_mode_set(struct drm_bridge *bridge,
 	if (ret < 0)
 		return;
 
-	/*
-	 * If hs clock is unchanged, we're all good - all parameters are
-	 * derived from it atm.
-	 */
-	if (new_cfg.mipi_dphy.hs_clk_rate == dsi->phy_cfg.mipi_dphy.hs_clk_rate)
-		return;
-
 	phy_ref_rate = clk_get_rate(dsi->phy_ref_clk);
 	DRM_DEV_DEBUG_DRIVER(dev, "PHY at ref rate: %lu\n", phy_ref_rate);
 	/* Save the new desired phy config */
@@ -866,14 +874,8 @@ nwl_dsi_bridge_mode_set(struct drm_bridge *bridge,
 
 	memcpy(&dsi->mode, adjusted_mode, sizeof(dsi->mode));
 	drm_mode_debug_printmodeline(adjusted_mode);
-}
 
-static void nwl_dsi_bridge_pre_enable(struct drm_bridge *bridge)
-{
-	struct nwl_dsi *dsi = bridge_to_dsi(bridge);
-	int ret;
-
-	pm_runtime_get_sync(dsi->dev);
+	pm_runtime_get_sync(dev);
 
 	if (clk_prepare_enable(dsi->lcdif_clk) < 0)
 		return;
@@ -883,27 +885,29 @@ static void nwl_dsi_bridge_pre_enable(struct drm_bridge *bridge)
 	/* Step 1 from DSI reset-out instructions */
 	ret = reset_control_deassert(dsi->rst_pclk);
 	if (ret < 0) {
-		DRM_DEV_ERROR(dsi->dev, "Failed to deassert PCLK: %d\n", ret);
+		DRM_DEV_ERROR(dev, "Failed to deassert PCLK: %d\n", ret);
 		return;
 	}
 
 	/* Step 2 from DSI reset-out instructions */
-	nwl_dsi_enable(dsi);
+	nwl_dsi_mode_set(dsi);
 
 	/* Step 3 from DSI reset-out instructions */
 	ret = reset_control_deassert(dsi->rst_esc);
 	if (ret < 0) {
-		DRM_DEV_ERROR(dsi->dev, "Failed to deassert ESC: %d\n", ret);
+		DRM_DEV_ERROR(dev, "Failed to deassert ESC: %d\n", ret);
 		return;
 	}
 	ret = reset_control_deassert(dsi->rst_byte);
 	if (ret < 0) {
-		DRM_DEV_ERROR(dsi->dev, "Failed to deassert BYTE: %d\n", ret);
+		DRM_DEV_ERROR(dev, "Failed to deassert BYTE: %d\n", ret);
 		return;
 	}
 }
 
-static void nwl_dsi_bridge_enable(struct drm_bridge *bridge)
+static void
+nwl_dsi_bridge_atomic_enable(struct drm_bridge *bridge,
+			     struct drm_bridge_state *old_bridge_state)
 {
 	struct nwl_dsi *dsi = bridge_to_dsi(bridge);
 	int ret;
@@ -948,14 +952,16 @@ static void nwl_dsi_bridge_detach(struct drm_bridge *bridge)
 }
 
 static const struct drm_bridge_funcs nwl_dsi_bridge_funcs = {
-	.pre_enable = nwl_dsi_bridge_pre_enable,
-	.enable     = nwl_dsi_bridge_enable,
-	.disable    = nwl_dsi_bridge_disable,
-	.mode_fixup = nwl_dsi_bridge_mode_fixup,
-	.mode_set   = nwl_dsi_bridge_mode_set,
-	.mode_valid = nwl_dsi_bridge_mode_valid,
-	.attach	    = nwl_dsi_bridge_attach,
-	.detach	    = nwl_dsi_bridge_detach,
+	.atomic_duplicate_state	= drm_atomic_helper_bridge_duplicate_state,
+	.atomic_destroy_state	= drm_atomic_helper_bridge_destroy_state,
+	.atomic_reset		= drm_atomic_helper_bridge_reset,
+	.atomic_check		= nwl_dsi_bridge_atomic_check,
+	.atomic_enable		= nwl_dsi_bridge_atomic_enable,
+	.atomic_disable		= nwl_dsi_bridge_atomic_disable,
+	.mode_set		= nwl_dsi_bridge_mode_set,
+	.mode_valid		= nwl_dsi_bridge_mode_valid,
+	.attach			= nwl_dsi_bridge_attach,
+	.detach			= nwl_dsi_bridge_detach,
 };
 
 static int nwl_dsi_parse_dt(struct nwl_dsi *dsi)
-- 
2.7.4

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Re: [PATCH v2] drm/bridge: nwl-dsi: Get MIPI DSI controller and PHY ready in ->mode_set()

[Neil Armstrong]

Hi,

On 22/04/2021 07:14, Liu Ying wrote:
> Some MIPI DSI panel drivers like 'raydium,rm68200' send
> MIPI_DCS_SET_DISPLAY_ON commands in panel_funcs->prepare(), which
> requires the MIPI DSI controller and PHY to be ready beforehand.
> Without this patch, the nwl-dsi driver gets the MIPI DSI controller
> and PHY ready in bridge_funcs->pre_enable(), which happens after
> the panel_funcs->prepare(). So, this patch shifts the bridge operation
> ealier from bridge_funcs->pre_enable() to bridge_funcs->mode_set().

This makes sense, this is how we do on the synopsys dw mipi dsi driver.

> This way, more MIPI DSI panels can connect to this nwl-dsi bridge.
> Care is taken to make sure bridge_funcs->mode_set()/atomic_disable()
> are called in pairs, which includes removing a check on unchanged HS
> clock rate and forcing a full modeset when only connector's DPMS is
> brought out of "Off" status.

I would split the changes in multiple patches to clarify the changes.

Neil

> 
> Cc: Andrzej Hajda <a.hajda@samsung.com>
> Cc: Neil Armstrong <narmstrong@baylibre.com>
> Cc: Robert Foss <robert.foss@linaro.org>
> Cc: Laurent Pinchart <Laurent.pinchart@ideasonboard.com>
> Cc: Jonas Karlman <jonas@kwiboo.se>
> Cc: Jernej Skrabec <jernej.skrabec@siol.net>
> Cc: David Airlie <airlied@linux.ie>
> Cc: Daniel Vetter <daniel@ffwll.ch>
> Cc: Guido Günther <agx@sigxcpu.org>
> Cc: Robert Chiras <robert.chiras@nxp.com>
> Cc: NXP Linux Team <linux-imx@nxp.com>
> Signed-off-by: Liu Ying <victor.liu@nxp.com>
> ---
> v1->v2:
> * Fix commit message typo - s/unchange/unchanged/
> 
>  drivers/gpu/drm/bridge/nwl-dsi.c | 86 +++++++++++++++++++++-------------------
>  1 file changed, 46 insertions(+), 40 deletions(-)
> 
> diff --git a/drivers/gpu/drm/bridge/nwl-dsi.c b/drivers/gpu/drm/bridge/nwl-dsi.c
> index be6bfc5..229f0b1 100644
> --- a/drivers/gpu/drm/bridge/nwl-dsi.c
> +++ b/drivers/gpu/drm/bridge/nwl-dsi.c
> @@ -21,6 +21,7 @@
>  #include <linux/sys_soc.h>
>  #include <linux/time64.h>
>  
> +#include <drm/drm_atomic_state_helper.h>
>  #include <drm/drm_bridge.h>
>  #include <drm/drm_mipi_dsi.h>
>  #include <drm/drm_of.h>
> @@ -661,7 +662,7 @@ static irqreturn_t nwl_dsi_irq_handler(int irq, void *data)
>  	return IRQ_HANDLED;
>  }
>  
> -static int nwl_dsi_enable(struct nwl_dsi *dsi)
> +static int nwl_dsi_mode_set(struct nwl_dsi *dsi)
>  {
>  	struct device *dev = dsi->dev;
>  	union phy_configure_opts *phy_cfg = &dsi->phy_cfg;
> @@ -748,7 +749,9 @@ static int nwl_dsi_disable(struct nwl_dsi *dsi)
>  	return 0;
>  }
>  
> -static void nwl_dsi_bridge_disable(struct drm_bridge *bridge)
> +static void
> +nwl_dsi_bridge_atomic_disable(struct drm_bridge *bridge,
> +			      struct drm_bridge_state *old_bridge_state)
>  {
>  	struct nwl_dsi *dsi = bridge_to_dsi(bridge);
>  	int ret;
> @@ -809,17 +812,6 @@ static int nwl_dsi_get_dphy_params(struct nwl_dsi *dsi,
>  	return 0;
>  }
>  
> -static bool nwl_dsi_bridge_mode_fixup(struct drm_bridge *bridge,
> -				      const struct drm_display_mode *mode,
> -				      struct drm_display_mode *adjusted_mode)
> -{
> -	/* At least LCDIF + NWL needs active high sync */
> -	adjusted_mode->flags |= (DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC);
> -	adjusted_mode->flags &= ~(DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC);
> -
> -	return true;
> -}
> -
>  static enum drm_mode_status
>  nwl_dsi_bridge_mode_valid(struct drm_bridge *bridge,
>  			  const struct drm_display_info *info,
> @@ -837,6 +829,29 @@ nwl_dsi_bridge_mode_valid(struct drm_bridge *bridge,
>  	return MODE_OK;
>  }
>  
> +static int nwl_dsi_bridge_atomic_check(struct drm_bridge *bridge,
> +				       struct drm_bridge_state *bridge_state,
> +				       struct drm_crtc_state *crtc_state,
> +				       struct drm_connector_state *conn_state)
> +{
> +	struct drm_display_mode *adjusted_mode = &crtc_state->adjusted_mode;
> +
> +	/* At least LCDIF + NWL needs active high sync */
> +	adjusted_mode->flags |= (DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC);
> +	adjusted_mode->flags &= ~(DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC);
> +
> +	/*
> +	 * Do a full modeset if crtc_state->active is changed to be true.
> +	 * This ensures our ->mode_set() is called to get the DSI controller
> +	 * and the PHY ready to send DCS commands, when only the connector's
> +	 * DPMS is brought out of "Off" status.
> +	 */
> +	if (crtc_state->active_changed && crtc_state->active)
> +		crtc_state->mode_changed = true;
> +
> +	return 0;
> +}
> +
>  static void
>  nwl_dsi_bridge_mode_set(struct drm_bridge *bridge,
>  			const struct drm_display_mode *mode,
> @@ -852,13 +867,6 @@ nwl_dsi_bridge_mode_set(struct drm_bridge *bridge,
>  	if (ret < 0)
>  		return;
>  
> -	/*
> -	 * If hs clock is unchanged, we're all good - all parameters are
> -	 * derived from it atm.
> -	 */
> -	if (new_cfg.mipi_dphy.hs_clk_rate == dsi->phy_cfg.mipi_dphy.hs_clk_rate)
> -		return;
> -
>  	phy_ref_rate = clk_get_rate(dsi->phy_ref_clk);
>  	DRM_DEV_DEBUG_DRIVER(dev, "PHY at ref rate: %lu\n", phy_ref_rate);
>  	/* Save the new desired phy config */
> @@ -866,14 +874,8 @@ nwl_dsi_bridge_mode_set(struct drm_bridge *bridge,
>  
>  	memcpy(&dsi->mode, adjusted_mode, sizeof(dsi->mode));
>  	drm_mode_debug_printmodeline(adjusted_mode);
> -}
>  
> -static void nwl_dsi_bridge_pre_enable(struct drm_bridge *bridge)
> -{
> -	struct nwl_dsi *dsi = bridge_to_dsi(bridge);
> -	int ret;
> -
> -	pm_runtime_get_sync(dsi->dev);
> +	pm_runtime_get_sync(dev);
>  
>  	if (clk_prepare_enable(dsi->lcdif_clk) < 0)
>  		return;
> @@ -883,27 +885,29 @@ static void nwl_dsi_bridge_pre_enable(struct drm_bridge *bridge)
>  	/* Step 1 from DSI reset-out instructions */
>  	ret = reset_control_deassert(dsi->rst_pclk);
>  	if (ret < 0) {
> -		DRM_DEV_ERROR(dsi->dev, "Failed to deassert PCLK: %d\n", ret);
> +		DRM_DEV_ERROR(dev, "Failed to deassert PCLK: %d\n", ret);
>  		return;
>  	}
>  
>  	/* Step 2 from DSI reset-out instructions */
> -	nwl_dsi_enable(dsi);
> +	nwl_dsi_mode_set(dsi);
>  
>  	/* Step 3 from DSI reset-out instructions */
>  	ret = reset_control_deassert(dsi->rst_esc);
>  	if (ret < 0) {
> -		DRM_DEV_ERROR(dsi->dev, "Failed to deassert ESC: %d\n", ret);
> +		DRM_DEV_ERROR(dev, "Failed to deassert ESC: %d\n", ret);
>  		return;
>  	}
>  	ret = reset_control_deassert(dsi->rst_byte);
>  	if (ret < 0) {
> -		DRM_DEV_ERROR(dsi->dev, "Failed to deassert BYTE: %d\n", ret);
> +		DRM_DEV_ERROR(dev, "Failed to deassert BYTE: %d\n", ret);
>  		return;
>  	}
>  }
>  
> -static void nwl_dsi_bridge_enable(struct drm_bridge *bridge)
> +static void
> +nwl_dsi_bridge_atomic_enable(struct drm_bridge *bridge,
> +			     struct drm_bridge_state *old_bridge_state)
>  {
>  	struct nwl_dsi *dsi = bridge_to_dsi(bridge);
>  	int ret;
> @@ -948,14 +952,16 @@ static void nwl_dsi_bridge_detach(struct drm_bridge *bridge)
>  }
>  
>  static const struct drm_bridge_funcs nwl_dsi_bridge_funcs = {
> -	.pre_enable = nwl_dsi_bridge_pre_enable,
> -	.enable     = nwl_dsi_bridge_enable,
> -	.disable    = nwl_dsi_bridge_disable,
> -	.mode_fixup = nwl_dsi_bridge_mode_fixup,
> -	.mode_set   = nwl_dsi_bridge_mode_set,
> -	.mode_valid = nwl_dsi_bridge_mode_valid,
> -	.attach	    = nwl_dsi_bridge_attach,
> -	.detach	    = nwl_dsi_bridge_detach,
> +	.atomic_duplicate_state	= drm_atomic_helper_bridge_duplicate_state,
> +	.atomic_destroy_state	= drm_atomic_helper_bridge_destroy_state,
> +	.atomic_reset		= drm_atomic_helper_bridge_reset,
> +	.atomic_check		= nwl_dsi_bridge_atomic_check,
> +	.atomic_enable		= nwl_dsi_bridge_atomic_enable,
> +	.atomic_disable		= nwl_dsi_bridge_atomic_disable,
> +	.mode_set		= nwl_dsi_bridge_mode_set,
> +	.mode_valid		= nwl_dsi_bridge_mode_valid,
> +	.attach			= nwl_dsi_bridge_attach,
> +	.detach			= nwl_dsi_bridge_detach,
>  };
>  
>  static int nwl_dsi_parse_dt(struct nwl_dsi *dsi)
> 

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Re: [PATCH v2] drm/bridge: nwl-dsi: Get MIPI DSI controller and PHY ready in ->mode_set()

[Liu Ying]

Hi Neil,

On Thu, 2021-04-22 at 10:48 +0200, Neil Armstrong wrote:
> Hi,
> 
> On 22/04/2021 07:14, Liu Ying wrote:
> > Some MIPI DSI panel drivers like 'raydium,rm68200' send
> > MIPI_DCS_SET_DISPLAY_ON commands in panel_funcs->prepare(), which
> > requires the MIPI DSI controller and PHY to be ready beforehand.
> > Without this patch, the nwl-dsi driver gets the MIPI DSI controller
> > and PHY ready in bridge_funcs->pre_enable(), which happens after
> > the panel_funcs->prepare(). So, this patch shifts the bridge operation
> > ealier from bridge_funcs->pre_enable() to bridge_funcs->mode_set().
> 
> This makes sense, this is how we do on the synopsys dw mipi dsi driver.
> 
> > This way, more MIPI DSI panels can connect to this nwl-dsi bridge.
> > Care is taken to make sure bridge_funcs->mode_set()/atomic_disable()
> > are called in pairs, which includes removing a check on unchanged HS
> > clock rate and forcing a full modeset when only connector's DPMS is
> > brought out of "Off" status.
> 
> I would split the changes in multiple patches to clarify the changes.

Maybe, I can split this into the below 3 patches:
1) Remove a check on unchanged HS clock rate from ->mode_set().
2) Force a full modeset when only connector's DPMS is brought out of
"Off" status. This will be done in ->atomic_check() together with the
fixup for H/VSYNC polarities.
3) Shift the bridge operation as the last step.

I'll mention that 1) & 2) are needed by 3) in their commit message.

Does this split-up sound reasonable?

Thanks,
Liu Ying

> 
> Neil
> 
> > Cc: Andrzej Hajda <a.hajda@samsung.com>
> > Cc: Neil Armstrong <narmstrong@baylibre.com>
> > Cc: Robert Foss <robert.foss@linaro.org>
> > Cc: Laurent Pinchart <Laurent.pinchart@ideasonboard.com>
> > Cc: Jonas Karlman <jonas@kwiboo.se>
> > Cc: Jernej Skrabec <jernej.skrabec@siol.net>
> > Cc: David Airlie <airlied@linux.ie>
> > Cc: Daniel Vetter <daniel@ffwll.ch>
> > Cc: Guido Günther <agx@sigxcpu.org>
> > Cc: Robert Chiras <robert.chiras@nxp.com>
> > Cc: NXP Linux Team <linux-imx@nxp.com>
> > Signed-off-by: Liu Ying <victor.liu@nxp.com>
> > ---
> > v1->v2:
> > * Fix commit message typo - s/unchange/unchanged/
> > 
> >  drivers/gpu/drm/bridge/nwl-dsi.c | 86 +++++++++++++++++++++-------------------
> >  1 file changed, 46 insertions(+), 40 deletions(-)
> > 
> > diff --git a/drivers/gpu/drm/bridge/nwl-dsi.c b/drivers/gpu/drm/bridge/nwl-dsi.c
> > index be6bfc5..229f0b1 100644
> > --- a/drivers/gpu/drm/bridge/nwl-dsi.c
> > +++ b/drivers/gpu/drm/bridge/nwl-dsi.c
> > @@ -21,6 +21,7 @@
> >  #include <linux/sys_soc.h>
> >  #include <linux/time64.h>
> >  
> > +#include <drm/drm_atomic_state_helper.h>
> >  #include <drm/drm_bridge.h>
> >  #include <drm/drm_mipi_dsi.h>
> >  #include <drm/drm_of.h>
> > @@ -661,7 +662,7 @@ static irqreturn_t nwl_dsi_irq_handler(int irq, void *data)
> >  	return IRQ_HANDLED;
> >  }
> >  
> > -static int nwl_dsi_enable(struct nwl_dsi *dsi)
> > +static int nwl_dsi_mode_set(struct nwl_dsi *dsi)
> >  {
> >  	struct device *dev = dsi->dev;
> >  	union phy_configure_opts *phy_cfg = &dsi->phy_cfg;
> > @@ -748,7 +749,9 @@ static int nwl_dsi_disable(struct nwl_dsi *dsi)
> >  	return 0;
> >  }
> >  
> > -static void nwl_dsi_bridge_disable(struct drm_bridge *bridge)
> > +static void
> > +nwl_dsi_bridge_atomic_disable(struct drm_bridge *bridge,
> > +			      struct drm_bridge_state *old_bridge_state)
> >  {
> >  	struct nwl_dsi *dsi = bridge_to_dsi(bridge);
> >  	int ret;
> > @@ -809,17 +812,6 @@ static int nwl_dsi_get_dphy_params(struct nwl_dsi *dsi,
> >  	return 0;
> >  }
> >  
> > -static bool nwl_dsi_bridge_mode_fixup(struct drm_bridge *bridge,
> > -				      const struct drm_display_mode *mode,
> > -				      struct drm_display_mode *adjusted_mode)
> > -{
> > -	/* At least LCDIF + NWL needs active high sync */
> > -	adjusted_mode->flags |= (DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC);
> > -	adjusted_mode->flags &= ~(DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC);
> > -
> > -	return true;
> > -}
> > -
> >  static enum drm_mode_status
> >  nwl_dsi_bridge_mode_valid(struct drm_bridge *bridge,
> >  			  const struct drm_display_info *info,
> > @@ -837,6 +829,29 @@ nwl_dsi_bridge_mode_valid(struct drm_bridge *bridge,
> >  	return MODE_OK;
> >  }
> >  
> > +static int nwl_dsi_bridge_atomic_check(struct drm_bridge *bridge,
> > +				       struct drm_bridge_state *bridge_state,
> > +				       struct drm_crtc_state *crtc_state,
> > +				       struct drm_connector_state *conn_state)
> > +{
> > +	struct drm_display_mode *adjusted_mode = &crtc_state->adjusted_mode;
> > +
> > +	/* At least LCDIF + NWL needs active high sync */
> > +	adjusted_mode->flags |= (DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC);
> > +	adjusted_mode->flags &= ~(DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC);
> > +
> > +	/*
> > +	 * Do a full modeset if crtc_state->active is changed to be true.
> > +	 * This ensures our ->mode_set() is called to get the DSI controller
> > +	 * and the PHY ready to send DCS commands, when only the connector's
> > +	 * DPMS is brought out of "Off" status.
> > +	 */
> > +	if (crtc_state->active_changed && crtc_state->active)
> > +		crtc_state->mode_changed = true;
> > +
> > +	return 0;
> > +}
> > +
> >  static void
> >  nwl_dsi_bridge_mode_set(struct drm_bridge *bridge,
> >  			const struct drm_display_mode *mode,
> > @@ -852,13 +867,6 @@ nwl_dsi_bridge_mode_set(struct drm_bridge *bridge,
> >  	if (ret < 0)
> >  		return;
> >  
> > -	/*
> > -	 * If hs clock is unchanged, we're all good - all parameters are
> > -	 * derived from it atm.
> > -	 */
> > -	if (new_cfg.mipi_dphy.hs_clk_rate == dsi->phy_cfg.mipi_dphy.hs_clk_rate)
> > -		return;
> > -
> >  	phy_ref_rate = clk_get_rate(dsi->phy_ref_clk);
> >  	DRM_DEV_DEBUG_DRIVER(dev, "PHY at ref rate: %lu\n", phy_ref_rate);
> >  	/* Save the new desired phy config */
> > @@ -866,14 +874,8 @@ nwl_dsi_bridge_mode_set(struct drm_bridge *bridge,
> >  
> >  	memcpy(&dsi->mode, adjusted_mode, sizeof(dsi->mode));
> >  	drm_mode_debug_printmodeline(adjusted_mode);
> > -}
> >  
> > -static void nwl_dsi_bridge_pre_enable(struct drm_bridge *bridge)
> > -{
> > -	struct nwl_dsi *dsi = bridge_to_dsi(bridge);
> > -	int ret;
> > -
> > -	pm_runtime_get_sync(dsi->dev);
> > +	pm_runtime_get_sync(dev);
> >  
> >  	if (clk_prepare_enable(dsi->lcdif_clk) < 0)
> >  		return;
> > @@ -883,27 +885,29 @@ static void nwl_dsi_bridge_pre_enable(struct drm_bridge *bridge)
> >  	/* Step 1 from DSI reset-out instructions */
> >  	ret = reset_control_deassert(dsi->rst_pclk);
> >  	if (ret < 0) {
> > -		DRM_DEV_ERROR(dsi->dev, "Failed to deassert PCLK: %d\n", ret);
> > +		DRM_DEV_ERROR(dev, "Failed to deassert PCLK: %d\n", ret);
> >  		return;
> >  	}
> >  
> >  	/* Step 2 from DSI reset-out instructions */
> > -	nwl_dsi_enable(dsi);
> > +	nwl_dsi_mode_set(dsi);
> >  
> >  	/* Step 3 from DSI reset-out instructions */
> >  	ret = reset_control_deassert(dsi->rst_esc);
> >  	if (ret < 0) {
> > -		DRM_DEV_ERROR(dsi->dev, "Failed to deassert ESC: %d\n", ret);
> > +		DRM_DEV_ERROR(dev, "Failed to deassert ESC: %d\n", ret);
> >  		return;
> >  	}
> >  	ret = reset_control_deassert(dsi->rst_byte);
> >  	if (ret < 0) {
> > -		DRM_DEV_ERROR(dsi->dev, "Failed to deassert BYTE: %d\n", ret);
> > +		DRM_DEV_ERROR(dev, "Failed to deassert BYTE: %d\n", ret);
> >  		return;
> >  	}
> >  }
> >  
> > -static void nwl_dsi_bridge_enable(struct drm_bridge *bridge)
> > +static void
> > +nwl_dsi_bridge_atomic_enable(struct drm_bridge *bridge,
> > +			     struct drm_bridge_state *old_bridge_state)
> >  {
> >  	struct nwl_dsi *dsi = bridge_to_dsi(bridge);
> >  	int ret;
> > @@ -948,14 +952,16 @@ static void nwl_dsi_bridge_detach(struct drm_bridge *bridge)
> >  }
> >  
> >  static const struct drm_bridge_funcs nwl_dsi_bridge_funcs = {
> > -	.pre_enable = nwl_dsi_bridge_pre_enable,
> > -	.enable     = nwl_dsi_bridge_enable,
> > -	.disable    = nwl_dsi_bridge_disable,
> > -	.mode_fixup = nwl_dsi_bridge_mode_fixup,
> > -	.mode_set   = nwl_dsi_bridge_mode_set,
> > -	.mode_valid = nwl_dsi_bridge_mode_valid,
> > -	.attach	    = nwl_dsi_bridge_attach,
> > -	.detach	    = nwl_dsi_bridge_detach,
> > +	.atomic_duplicate_state	= drm_atomic_helper_bridge_duplicate_state,
> > +	.atomic_destroy_state	= drm_atomic_helper_bridge_destroy_state,
> > +	.atomic_reset		= drm_atomic_helper_bridge_reset,
> > +	.atomic_check		= nwl_dsi_bridge_atomic_check,
> > +	.atomic_enable		= nwl_dsi_bridge_atomic_enable,
> > +	.atomic_disable		= nwl_dsi_bridge_atomic_disable,
> > +	.mode_set		= nwl_dsi_bridge_mode_set,
> > +	.mode_valid		= nwl_dsi_bridge_mode_valid,
> > +	.attach			= nwl_dsi_bridge_attach,
> > +	.detach			= nwl_dsi_bridge_detach,
> >  };
> >  
> >  static int nwl_dsi_parse_dt(struct nwl_dsi *dsi)
> > 

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Re: [PATCH v2] drm/bridge: nwl-dsi: Get MIPI DSI controller and PHY ready in ->mode_set()

[Neil Armstrong]

Hi,

On 22/04/2021 11:31, Liu Ying wrote:
> Hi Neil,
> 
> On Thu, 2021-04-22 at 10:48 +0200, Neil Armstrong wrote:
>> Hi,
>>
>> On 22/04/2021 07:14, Liu Ying wrote:
>>> Some MIPI DSI panel drivers like 'raydium,rm68200' send
>>> MIPI_DCS_SET_DISPLAY_ON commands in panel_funcs->prepare(), which
>>> requires the MIPI DSI controller and PHY to be ready beforehand.
>>> Without this patch, the nwl-dsi driver gets the MIPI DSI controller
>>> and PHY ready in bridge_funcs->pre_enable(), which happens after
>>> the panel_funcs->prepare(). So, this patch shifts the bridge operation
>>> ealier from bridge_funcs->pre_enable() to bridge_funcs->mode_set().
>>
>> This makes sense, this is how we do on the synopsys dw mipi dsi driver.
>>
>>> This way, more MIPI DSI panels can connect to this nwl-dsi bridge.
>>> Care is taken to make sure bridge_funcs->mode_set()/atomic_disable()
>>> are called in pairs, which includes removing a check on unchanged HS
>>> clock rate and forcing a full modeset when only connector's DPMS is
>>> brought out of "Off" status.
>>
>> I would split the changes in multiple patches to clarify the changes.
> 
> Maybe, I can split this into the below 3 patches:
> 1) Remove a check on unchanged HS clock rate from ->mode_set().
> 2) Force a full modeset when only connector's DPMS is brought out of
> "Off" status. This will be done in ->atomic_check() together with the
> fixup for H/VSYNC polarities.
> 3) Shift the bridge operation as the last step.
> 
> I'll mention that 1) & 2) are needed by 3) in their commit message.

Sure, you can also put this split explanation in the cover letter.

> 
> Does this split-up sound reasonable?

Yes makes sense, thanks

Neil

> 
> Thanks,
> Liu Ying
> 
>>
>> Neil
>>
>>> Cc: Andrzej Hajda <a.hajda@samsung.com>
>>> Cc: Neil Armstrong <narmstrong@baylibre.com>
>>> Cc: Robert Foss <robert.foss@linaro.org>
>>> Cc: Laurent Pinchart <Laurent.pinchart@ideasonboard.com>
>>> Cc: Jonas Karlman <jonas@kwiboo.se>
>>> Cc: Jernej Skrabec <jernej.skrabec@siol.net>
>>> Cc: David Airlie <airlied@linux.ie>
>>> Cc: Daniel Vetter <daniel@ffwll.ch>
>>> Cc: Guido Günther <agx@sigxcpu.org>
>>> Cc: Robert Chiras <robert.chiras@nxp.com>
>>> Cc: NXP Linux Team <linux-imx@nxp.com>
>>> Signed-off-by: Liu Ying <victor.liu@nxp.com>
>>> ---
>>> v1->v2:
>>> * Fix commit message typo - s/unchange/unchanged/
>>>
>>>  drivers/gpu/drm/bridge/nwl-dsi.c | 86 +++++++++++++++++++++-------------------
>>>  1 file changed, 46 insertions(+), 40 deletions(-)
>>>
>>> diff --git a/drivers/gpu/drm/bridge/nwl-dsi.c b/drivers/gpu/drm/bridge/nwl-dsi.c
>>> index be6bfc5..229f0b1 100644
>>> --- a/drivers/gpu/drm/bridge/nwl-dsi.c
>>> +++ b/drivers/gpu/drm/bridge/nwl-dsi.c
>>> @@ -21,6 +21,7 @@
>>>  #include <linux/sys_soc.h>
>>>  #include <linux/time64.h>
>>>  
>>> +#include <drm/drm_atomic_state_helper.h>
>>>  #include <drm/drm_bridge.h>
>>>  #include <drm/drm_mipi_dsi.h>
>>>  #include <drm/drm_of.h>
>>> @@ -661,7 +662,7 @@ static irqreturn_t nwl_dsi_irq_handler(int irq, void *data)
>>>  	return IRQ_HANDLED;
>>>  }
>>>  
>>> -static int nwl_dsi_enable(struct nwl_dsi *dsi)
>>> +static int nwl_dsi_mode_set(struct nwl_dsi *dsi)
>>>  {
>>>  	struct device *dev = dsi->dev;
>>>  	union phy_configure_opts *phy_cfg = &dsi->phy_cfg;
>>> @@ -748,7 +749,9 @@ static int nwl_dsi_disable(struct nwl_dsi *dsi)
>>>  	return 0;
>>>  }
>>>  
>>> -static void nwl_dsi_bridge_disable(struct drm_bridge *bridge)
>>> +static void
>>> +nwl_dsi_bridge_atomic_disable(struct drm_bridge *bridge,
>>> +			      struct drm_bridge_state *old_bridge_state)
>>>  {
>>>  	struct nwl_dsi *dsi = bridge_to_dsi(bridge);
>>>  	int ret;
>>> @@ -809,17 +812,6 @@ static int nwl_dsi_get_dphy_params(struct nwl_dsi *dsi,
>>>  	return 0;
>>>  }
>>>  
>>> -static bool nwl_dsi_bridge_mode_fixup(struct drm_bridge *bridge,
>>> -				      const struct drm_display_mode *mode,
>>> -				      struct drm_display_mode *adjusted_mode)
>>> -{
>>> -	/* At least LCDIF + NWL needs active high sync */
>>> -	adjusted_mode->flags |= (DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC);
>>> -	adjusted_mode->flags &= ~(DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC);
>>> -
>>> -	return true;
>>> -}
>>> -
>>>  static enum drm_mode_status
>>>  nwl_dsi_bridge_mode_valid(struct drm_bridge *bridge,
>>>  			  const struct drm_display_info *info,
>>> @@ -837,6 +829,29 @@ nwl_dsi_bridge_mode_valid(struct drm_bridge *bridge,
>>>  	return MODE_OK;
>>>  }
>>>  
>>> +static int nwl_dsi_bridge_atomic_check(struct drm_bridge *bridge,
>>> +				       struct drm_bridge_state *bridge_state,
>>> +				       struct drm_crtc_state *crtc_state,
>>> +				       struct drm_connector_state *conn_state)
>>> +{
>>> +	struct drm_display_mode *adjusted_mode = &crtc_state->adjusted_mode;
>>> +
>>> +	/* At least LCDIF + NWL needs active high sync */
>>> +	adjusted_mode->flags |= (DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC);
>>> +	adjusted_mode->flags &= ~(DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC);
>>> +
>>> +	/*
>>> +	 * Do a full modeset if crtc_state->active is changed to be true.
>>> +	 * This ensures our ->mode_set() is called to get the DSI controller
>>> +	 * and the PHY ready to send DCS commands, when only the connector's
>>> +	 * DPMS is brought out of "Off" status.
>>> +	 */
>>> +	if (crtc_state->active_changed && crtc_state->active)
>>> +		crtc_state->mode_changed = true;
>>> +
>>> +	return 0;
>>> +}
>>> +
>>>  static void
>>>  nwl_dsi_bridge_mode_set(struct drm_bridge *bridge,
>>>  			const struct drm_display_mode *mode,
>>> @@ -852,13 +867,6 @@ nwl_dsi_bridge_mode_set(struct drm_bridge *bridge,
>>>  	if (ret < 0)
>>>  		return;
>>>  
>>> -	/*
>>> -	 * If hs clock is unchanged, we're all good - all parameters are
>>> -	 * derived from it atm.
>>> -	 */
>>> -	if (new_cfg.mipi_dphy.hs_clk_rate == dsi->phy_cfg.mipi_dphy.hs_clk_rate)
>>> -		return;
>>> -
>>>  	phy_ref_rate = clk_get_rate(dsi->phy_ref_clk);
>>>  	DRM_DEV_DEBUG_DRIVER(dev, "PHY at ref rate: %lu\n", phy_ref_rate);
>>>  	/* Save the new desired phy config */
>>> @@ -866,14 +874,8 @@ nwl_dsi_bridge_mode_set(struct drm_bridge *bridge,
>>>  
>>>  	memcpy(&dsi->mode, adjusted_mode, sizeof(dsi->mode));
>>>  	drm_mode_debug_printmodeline(adjusted_mode);
>>> -}
>>>  
>>> -static void nwl_dsi_bridge_pre_enable(struct drm_bridge *bridge)
>>> -{
>>> -	struct nwl_dsi *dsi = bridge_to_dsi(bridge);
>>> -	int ret;
>>> -
>>> -	pm_runtime_get_sync(dsi->dev);
>>> +	pm_runtime_get_sync(dev);
>>>  
>>>  	if (clk_prepare_enable(dsi->lcdif_clk) < 0)
>>>  		return;
>>> @@ -883,27 +885,29 @@ static void nwl_dsi_bridge_pre_enable(struct drm_bridge *bridge)
>>>  	/* Step 1 from DSI reset-out instructions */
>>>  	ret = reset_control_deassert(dsi->rst_pclk);
>>>  	if (ret < 0) {
>>> -		DRM_DEV_ERROR(dsi->dev, "Failed to deassert PCLK: %d\n", ret);
>>> +		DRM_DEV_ERROR(dev, "Failed to deassert PCLK: %d\n", ret);
>>>  		return;
>>>  	}
>>>  
>>>  	/* Step 2 from DSI reset-out instructions */
>>> -	nwl_dsi_enable(dsi);
>>> +	nwl_dsi_mode_set(dsi);
>>>  
>>>  	/* Step 3 from DSI reset-out instructions */
>>>  	ret = reset_control_deassert(dsi->rst_esc);
>>>  	if (ret < 0) {
>>> -		DRM_DEV_ERROR(dsi->dev, "Failed to deassert ESC: %d\n", ret);
>>> +		DRM_DEV_ERROR(dev, "Failed to deassert ESC: %d\n", ret);
>>>  		return;
>>>  	}
>>>  	ret = reset_control_deassert(dsi->rst_byte);
>>>  	if (ret < 0) {
>>> -		DRM_DEV_ERROR(dsi->dev, "Failed to deassert BYTE: %d\n", ret);
>>> +		DRM_DEV_ERROR(dev, "Failed to deassert BYTE: %d\n", ret);
>>>  		return;
>>>  	}
>>>  }
>>>  
>>> -static void nwl_dsi_bridge_enable(struct drm_bridge *bridge)
>>> +static void
>>> +nwl_dsi_bridge_atomic_enable(struct drm_bridge *bridge,
>>> +			     struct drm_bridge_state *old_bridge_state)
>>>  {
>>>  	struct nwl_dsi *dsi = bridge_to_dsi(bridge);
>>>  	int ret;
>>> @@ -948,14 +952,16 @@ static void nwl_dsi_bridge_detach(struct drm_bridge *bridge)
>>>  }
>>>  
>>>  static const struct drm_bridge_funcs nwl_dsi_bridge_funcs = {
>>> -	.pre_enable = nwl_dsi_bridge_pre_enable,
>>> -	.enable     = nwl_dsi_bridge_enable,
>>> -	.disable    = nwl_dsi_bridge_disable,
>>> -	.mode_fixup = nwl_dsi_bridge_mode_fixup,
>>> -	.mode_set   = nwl_dsi_bridge_mode_set,
>>> -	.mode_valid = nwl_dsi_bridge_mode_valid,
>>> -	.attach	    = nwl_dsi_bridge_attach,
>>> -	.detach	    = nwl_dsi_bridge_detach,
>>> +	.atomic_duplicate_state	= drm_atomic_helper_bridge_duplicate_state,
>>> +	.atomic_destroy_state	= drm_atomic_helper_bridge_destroy_state,
>>> +	.atomic_reset		= drm_atomic_helper_bridge_reset,
>>> +	.atomic_check		= nwl_dsi_bridge_atomic_check,
>>> +	.atomic_enable		= nwl_dsi_bridge_atomic_enable,
>>> +	.atomic_disable		= nwl_dsi_bridge_atomic_disable,
>>> +	.mode_set		= nwl_dsi_bridge_mode_set,
>>> +	.mode_valid		= nwl_dsi_bridge_mode_valid,
>>> +	.attach			= nwl_dsi_bridge_attach,
>>> +	.detach			= nwl_dsi_bridge_detach,
>>>  };
>>>  
>>>  static int nwl_dsi_parse_dt(struct nwl_dsi *dsi)
>>>
> 

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Re: [PATCH v2] drm/bridge: nwl-dsi: Get MIPI DSI controller and PHY ready in ->mode_set()

[Liu Ying]

Hi Neil,

On Thu, 2021-04-22 at 14:07 +0200, Neil Armstrong wrote:
> Hi,
> 
> On 22/04/2021 11:31, Liu Ying wrote:
> > Hi Neil,
> > 
> > On Thu, 2021-04-22 at 10:48 +0200, Neil Armstrong wrote:
> > > Hi,
> > > 
> > > On 22/04/2021 07:14, Liu Ying wrote:
> > > > Some MIPI DSI panel drivers like 'raydium,rm68200' send
> > > > MIPI_DCS_SET_DISPLAY_ON commands in panel_funcs->prepare(), which
> > > > requires the MIPI DSI controller and PHY to be ready beforehand.
> > > > Without this patch, the nwl-dsi driver gets the MIPI DSI controller
> > > > and PHY ready in bridge_funcs->pre_enable(), which happens after
> > > > the panel_funcs->prepare(). So, this patch shifts the bridge operation
> > > > ealier from bridge_funcs->pre_enable() to bridge_funcs->mode_set().
> > > 
> > > This makes sense, this is how we do on the synopsys dw mipi dsi driver.
> > > 
> > > > This way, more MIPI DSI panels can connect to this nwl-dsi bridge.
> > > > Care is taken to make sure bridge_funcs->mode_set()/atomic_disable()
> > > > are called in pairs, which includes removing a check on unchanged HS
> > > > clock rate and forcing a full modeset when only connector's DPMS is
> > > > brought out of "Off" status.
> > > 
> > > I would split the changes in multiple patches to clarify the changes.
> > 
> > Maybe, I can split this into the below 3 patches:
> > 1) Remove a check on unchanged HS clock rate from ->mode_set().
> > 2) Force a full modeset when only connector's DPMS is brought out of
> > "Off" status. This will be done in ->atomic_check() together with the
> > fixup for H/VSYNC polarities.
> > 3) Shift the bridge operation as the last step.
> > 
> > I'll mention that 1) & 2) are needed by 3) in their commit message.
> 
> Sure, you can also put this split explanation in the cover letter.
> 
> > Does this split-up sound reasonable?
> 
> Yes makes sense, thanks

I've sent v3 to do the split-up.
I actually swap 1) and 2), which is trivial I assume.

Regards,
Liu Ying

> 
> Neil
> 
> > Thanks,
> > Liu Ying
> > 
> > > Neil
> > > 
> > > > Cc: Andrzej Hajda <a.hajda@samsung.com>
> > > > Cc: Neil Armstrong <narmstrong@baylibre.com>
> > > > Cc: Robert Foss <robert.foss@linaro.org>
> > > > Cc: Laurent Pinchart <Laurent.pinchart@ideasonboard.com>
> > > > Cc: Jonas Karlman <jonas@kwiboo.se>
> > > > Cc: Jernej Skrabec <jernej.skrabec@siol.net>
> > > > Cc: David Airlie <airlied@linux.ie>
> > > > Cc: Daniel Vetter <daniel@ffwll.ch>
> > > > Cc: Guido Günther <agx@sigxcpu.org>
> > > > Cc: Robert Chiras <robert.chiras@nxp.com>
> > > > Cc: NXP Linux Team <linux-imx@nxp.com>
> > > > Signed-off-by: Liu Ying <victor.liu@nxp.com>
> > > > ---
> > > > v1->v2:
> > > > * Fix commit message typo - s/unchange/unchanged/
> > > > 
> > > >  drivers/gpu/drm/bridge/nwl-dsi.c | 86 +++++++++++++++++++++-------------------
> > > >  1 file changed, 46 insertions(+), 40 deletions(-)
> > > > 
> > > > diff --git a/drivers/gpu/drm/bridge/nwl-dsi.c b/drivers/gpu/drm/bridge/nwl-dsi.c
> > > > index be6bfc5..229f0b1 100644
> > > > --- a/drivers/gpu/drm/bridge/nwl-dsi.c
> > > > +++ b/drivers/gpu/drm/bridge/nwl-dsi.c
> > > > @@ -21,6 +21,7 @@
> > > >  #include <linux/sys_soc.h>
> > > >  #include <linux/time64.h>
> > > >  
> > > > +#include <drm/drm_atomic_state_helper.h>
> > > >  #include <drm/drm_bridge.h>
> > > >  #include <drm/drm_mipi_dsi.h>
> > > >  #include <drm/drm_of.h>
> > > > @@ -661,7 +662,7 @@ static irqreturn_t nwl_dsi_irq_handler(int irq, void *data)
> > > >  	return IRQ_HANDLED;
> > > >  }
> > > >  
> > > > -static int nwl_dsi_enable(struct nwl_dsi *dsi)
> > > > +static int nwl_dsi_mode_set(struct nwl_dsi *dsi)
> > > >  {
> > > >  	struct device *dev = dsi->dev;
> > > >  	union phy_configure_opts *phy_cfg = &dsi->phy_cfg;
> > > > @@ -748,7 +749,9 @@ static int nwl_dsi_disable(struct nwl_dsi *dsi)
> > > >  	return 0;
> > > >  }
> > > >  
> > > > -static void nwl_dsi_bridge_disable(struct drm_bridge *bridge)
> > > > +static void
> > > > +nwl_dsi_bridge_atomic_disable(struct drm_bridge *bridge,
> > > > +			      struct drm_bridge_state *old_bridge_state)
> > > >  {
> > > >  	struct nwl_dsi *dsi = bridge_to_dsi(bridge);
> > > >  	int ret;
> > > > @@ -809,17 +812,6 @@ static int nwl_dsi_get_dphy_params(struct nwl_dsi *dsi,
> > > >  	return 0;
> > > >  }
> > > >  
> > > > -static bool nwl_dsi_bridge_mode_fixup(struct drm_bridge *bridge,
> > > > -				      const struct drm_display_mode *mode,
> > > > -				      struct drm_display_mode *adjusted_mode)
> > > > -{
> > > > -	/* At least LCDIF + NWL needs active high sync */
> > > > -	adjusted_mode->flags |= (DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC);
> > > > -	adjusted_mode->flags &= ~(DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC);
> > > > -
> > > > -	return true;
> > > > -}
> > > > -
> > > >  static enum drm_mode_status
> > > >  nwl_dsi_bridge_mode_valid(struct drm_bridge *bridge,
> > > >  			  const struct drm_display_info *info,
> > > > @@ -837,6 +829,29 @@ nwl_dsi_bridge_mode_valid(struct drm_bridge *bridge,
> > > >  	return MODE_OK;
> > > >  }
> > > >  
> > > > +static int nwl_dsi_bridge_atomic_check(struct drm_bridge *bridge,
> > > > +				       struct drm_bridge_state *bridge_state,
> > > > +				       struct drm_crtc_state *crtc_state,
> > > > +				       struct drm_connector_state *conn_state)
> > > > +{
> > > > +	struct drm_display_mode *adjusted_mode = &crtc_state->adjusted_mode;
> > > > +
> > > > +	/* At least LCDIF + NWL needs active high sync */
> > > > +	adjusted_mode->flags |= (DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC);
> > > > +	adjusted_mode->flags &= ~(DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC);
> > > > +
> > > > +	/*
> > > > +	 * Do a full modeset if crtc_state->active is changed to be true.
> > > > +	 * This ensures our ->mode_set() is called to get the DSI controller
> > > > +	 * and the PHY ready to send DCS commands, when only the connector's
> > > > +	 * DPMS is brought out of "Off" status.
> > > > +	 */
> > > > +	if (crtc_state->active_changed && crtc_state->active)
> > > > +		crtc_state->mode_changed = true;
> > > > +
> > > > +	return 0;
> > > > +}
> > > > +
> > > >  static void
> > > >  nwl_dsi_bridge_mode_set(struct drm_bridge *bridge,
> > > >  			const struct drm_display_mode *mode,
> > > > @@ -852,13 +867,6 @@ nwl_dsi_bridge_mode_set(struct drm_bridge *bridge,
> > > >  	if (ret < 0)
> > > >  		return;
> > > >  
> > > > -	/*
> > > > -	 * If hs clock is unchanged, we're all good - all parameters are
> > > > -	 * derived from it atm.
> > > > -	 */
> > > > -	if (new_cfg.mipi_dphy.hs_clk_rate == dsi->phy_cfg.mipi_dphy.hs_clk_rate)
> > > > -		return;
> > > > -
> > > >  	phy_ref_rate = clk_get_rate(dsi->phy_ref_clk);
> > > >  	DRM_DEV_DEBUG_DRIVER(dev, "PHY at ref rate: %lu\n", phy_ref_rate);
> > > >  	/* Save the new desired phy config */
> > > > @@ -866,14 +874,8 @@ nwl_dsi_bridge_mode_set(struct drm_bridge *bridge,
> > > >  
> > > >  	memcpy(&dsi->mode, adjusted_mode, sizeof(dsi->mode));
> > > >  	drm_mode_debug_printmodeline(adjusted_mode);
> > > > -}
> > > >  
> > > > -static void nwl_dsi_bridge_pre_enable(struct drm_bridge *bridge)
> > > > -{
> > > > -	struct nwl_dsi *dsi = bridge_to_dsi(bridge);
> > > > -	int ret;
> > > > -
> > > > -	pm_runtime_get_sync(dsi->dev);
> > > > +	pm_runtime_get_sync(dev);
> > > >  
> > > >  	if (clk_prepare_enable(dsi->lcdif_clk) < 0)
> > > >  		return;
> > > > @@ -883,27 +885,29 @@ static void nwl_dsi_bridge_pre_enable(struct drm_bridge *bridge)
> > > >  	/* Step 1 from DSI reset-out instructions */
> > > >  	ret = reset_control_deassert(dsi->rst_pclk);
> > > >  	if (ret < 0) {
> > > > -		DRM_DEV_ERROR(dsi->dev, "Failed to deassert PCLK: %d\n", ret);
> > > > +		DRM_DEV_ERROR(dev, "Failed to deassert PCLK: %d\n", ret);
> > > >  		return;
> > > >  	}
> > > >  
> > > >  	/* Step 2 from DSI reset-out instructions */
> > > > -	nwl_dsi_enable(dsi);
> > > > +	nwl_dsi_mode_set(dsi);
> > > >  
> > > >  	/* Step 3 from DSI reset-out instructions */
> > > >  	ret = reset_control_deassert(dsi->rst_esc);
> > > >  	if (ret < 0) {
> > > > -		DRM_DEV_ERROR(dsi->dev, "Failed to deassert ESC: %d\n", ret);
> > > > +		DRM_DEV_ERROR(dev, "Failed to deassert ESC: %d\n", ret);
> > > >  		return;
> > > >  	}
> > > >  	ret = reset_control_deassert(dsi->rst_byte);
> > > >  	if (ret < 0) {
> > > > -		DRM_DEV_ERROR(dsi->dev, "Failed to deassert BYTE: %d\n", ret);
> > > > +		DRM_DEV_ERROR(dev, "Failed to deassert BYTE: %d\n", ret);
> > > >  		return;
> > > >  	}
> > > >  }
> > > >  
> > > > -static void nwl_dsi_bridge_enable(struct drm_bridge *bridge)
> > > > +static void
> > > > +nwl_dsi_bridge_atomic_enable(struct drm_bridge *bridge,
> > > > +			     struct drm_bridge_state *old_bridge_state)
> > > >  {
> > > >  	struct nwl_dsi *dsi = bridge_to_dsi(bridge);
> > > >  	int ret;
> > > > @@ -948,14 +952,16 @@ static void nwl_dsi_bridge_detach(struct drm_bridge *bridge)
> > > >  }
> > > >  
> > > >  static const struct drm_bridge_funcs nwl_dsi_bridge_funcs = {
> > > > -	.pre_enable = nwl_dsi_bridge_pre_enable,
> > > > -	.enable     = nwl_dsi_bridge_enable,
> > > > -	.disable    = nwl_dsi_bridge_disable,
> > > > -	.mode_fixup = nwl_dsi_bridge_mode_fixup,
> > > > -	.mode_set   = nwl_dsi_bridge_mode_set,
> > > > -	.mode_valid = nwl_dsi_bridge_mode_valid,
> > > > -	.attach	    = nwl_dsi_bridge_attach,
> > > > -	.detach	    = nwl_dsi_bridge_detach,
> > > > +	.atomic_duplicate_state	= drm_atomic_helper_bridge_duplicate_state,
> > > > +	.atomic_destroy_state	= drm_atomic_helper_bridge_destroy_state,
> > > > +	.atomic_reset		= drm_atomic_helper_bridge_reset,
> > > > +	.atomic_check		= nwl_dsi_bridge_atomic_check,
> > > > +	.atomic_enable		= nwl_dsi_bridge_atomic_enable,
> > > > +	.atomic_disable		= nwl_dsi_bridge_atomic_disable,
> > > > +	.mode_set		= nwl_dsi_bridge_mode_set,
> > > > +	.mode_valid		= nwl_dsi_bridge_mode_valid,
> > > > +	.attach			= nwl_dsi_bridge_attach,
> > > > +	.detach			= nwl_dsi_bridge_detach,
> > > >  };
> > > >  
> > > >  static int nwl_dsi_parse_dt(struct nwl_dsi *dsi)
> > > > 

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