[PATCH v3 0/3] drm/bridge: nwl-dsi: Get MIPI DSI controller and PHY ready in ->mode_set()

[PATCH v3 0/3] drm/bridge: nwl-dsi: Get MIPI DSI controller and PHY ready in ->mode_set()

[Liu Ying]

Hi,

This series aims to make the nwl-dsi bridge be able to connect with
more MIPI DSI panels.  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.
However, the existing 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 series shifts the bridge operation
ealier from bridge_funcs->pre_enable() to bridge_funcs->mode_set().

Patch 3/3 does the essential bridge operation shift.

Patch 1/3 and 2/3 are split from the original single patch in v2 and
are needed by patch 3/3.  This split-up helps clarify changes better.
The split-up is done in this way:

1) Patch 1/3 forces a full modeset when crtc_state->active is changed to
   be true(which implies only connector's DPMS is brought out of "Off"
   status, though not necessarily).  This makes sure ->mode_set() and
   ->atomic_disable() will be called in pairs.
2) Patch 2/3 removes a check on unchanged HS clock rate from ->mode_set(),
   to make sure MIPI DSI controller and PHY are brought up and taken down
   in pairs.
3) Patch 3/3 shifts the bridge operation as the last step.


v2->v3:
* Split the single patch in v2 into 3 patches. (Neil)

v1->v2:
* Fix a typo in commit message - s/unchange/unchanged/


Liu Ying (3):
  drm/bridge: nwl-dsi: Force a full modeset when crtc_state->active is
    changed to be true
  drm/bridge: nwl-dsi: Remove a check on unchanged HS clock rate from
    ->mode_set()
  drm/bridge: nwl-dsi: Get MIPI DSI controller and PHY ready in
    ->mode_set()

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

-- 
2.25.1

[PATCH v3 1/3] drm/bridge: nwl-dsi: Force a full modeset when crtc_state->active is changed to be true

[Liu Ying]

This patch replaces ->mode_fixup() with ->atomic_check() so that
a full modeset can be requested from there when crtc_state->active
is changed to be true(which implies only connector's DPMS is brought
out of "Off" status, though not necessarily).  Bridge functions are
added or changed to accommodate the ->atomic_check() callback.  That
full modeset is needed by the up-coming patch which gets MIPI DSI
controller and PHY ready in ->mode_set(), because it makes sure
->mode_set() and ->atomic_disable() are called in pairs.

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>
---
v2->v3:
* Split from the single patch in v2 to clarify changes. (Neil)

 drivers/gpu/drm/bridge/nwl-dsi.c | 61 ++++++++++++++++++++------------
 1 file changed, 39 insertions(+), 22 deletions(-)

diff --git a/drivers/gpu/drm/bridge/nwl-dsi.c b/drivers/gpu/drm/bridge/nwl-dsi.c
index 66b67402f1acd..c65ca860712d2 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>
@@ -742,7 +743,9 @@ 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;
@@ -803,17 +806,6 @@ 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,
@@ -831,6 +823,24 @@ 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. */
+	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,
@@ -862,7 +872,9 @@ nwl_dsi_bridge_mode_set(struct drm_bridge *bridge,
 	drm_mode_debug_printmodeline(adjusted_mode);
 }
 
-static void nwl_dsi_bridge_pre_enable(struct drm_bridge *bridge)
+static void
+nwl_dsi_bridge_atomic_pre_enable(struct drm_bridge *bridge,
+				 struct drm_bridge_state *old_bridge_state)
 {
 	struct nwl_dsi *dsi = bridge_to_dsi(bridge);
 	int ret;
@@ -897,7 +909,9 @@ static void nwl_dsi_bridge_pre_enable(struct drm_bridge *bridge)
 	}
 }
 
-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;
@@ -942,14 +956,17 @@ 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_pre_enable	= nwl_dsi_bridge_atomic_pre_enable,
+	.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)
-- 
2.25.1

Re: [PATCH v3 1/3] drm/bridge: nwl-dsi: Force a full modeset when crtc_state->active is changed to be true

[Neil Armstrong]

On 23/04/2021 11:26, Liu Ying wrote:
> This patch replaces ->mode_fixup() with ->atomic_check() so that
> a full modeset can be requested from there when crtc_state->active
> is changed to be true(which implies only connector's DPMS is brought
> out of "Off" status, though not necessarily).  Bridge functions are
> added or changed to accommodate the ->atomic_check() callback.  That
> full modeset is needed by the up-coming patch which gets MIPI DSI
> controller and PHY ready in ->mode_set(), because it makes sure
> ->mode_set() and ->atomic_disable() are called in pairs.
> 
> 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>
> ---
> v2->v3:
> * Split from the single patch in v2 to clarify changes. (Neil)
> 
>  drivers/gpu/drm/bridge/nwl-dsi.c | 61 ++++++++++++++++++++------------
>  1 file changed, 39 insertions(+), 22 deletions(-)
> 
> diff --git a/drivers/gpu/drm/bridge/nwl-dsi.c b/drivers/gpu/drm/bridge/nwl-dsi.c
> index 66b67402f1acd..c65ca860712d2 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>
> @@ -742,7 +743,9 @@ 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;
> @@ -803,17 +806,6 @@ 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,
> @@ -831,6 +823,24 @@ 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. */
> +	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,
> @@ -862,7 +872,9 @@ nwl_dsi_bridge_mode_set(struct drm_bridge *bridge,
>  	drm_mode_debug_printmodeline(adjusted_mode);
>  }
>  
> -static void nwl_dsi_bridge_pre_enable(struct drm_bridge *bridge)
> +static void
> +nwl_dsi_bridge_atomic_pre_enable(struct drm_bridge *bridge,
> +				 struct drm_bridge_state *old_bridge_state)
>  {
>  	struct nwl_dsi *dsi = bridge_to_dsi(bridge);
>  	int ret;
> @@ -897,7 +909,9 @@ static void nwl_dsi_bridge_pre_enable(struct drm_bridge *bridge)
>  	}
>  }
>  
> -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;
> @@ -942,14 +956,17 @@ 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_pre_enable	= nwl_dsi_bridge_atomic_pre_enable,
> +	.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)
> 

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

Re: [PATCH v3 1/3] drm/bridge: nwl-dsi: Force a full modeset when crtc_state->active is changed to be true

[Liu Ying]

Hi Robert,

On Fri, 2021-04-30 at 11:56 +0200, Robert Foss wrote:
> Hey Liu,
> 
> This patch does not apply on upstream-drm-misc/drm-misc-next. When it
> passes local testing & building, I'm ready to merge it.

I see Neil has already pushed this entire patch series to
drm-misc-next.


https://cgit.freedesktop.org/drm/drm-misc/commit/?id=885811372fe101c4299c53eecc9fee72cf927a0c

I also see Guido's R-b and T-b tags on this series, though they comes
after Neil's push perhaps.

Thanks,
Liu Ying

> 
> On Fri, 23 Apr 2021 at 11:42, Liu Ying <victor.liu@nxp.com> wrote:
> > This patch replaces ->mode_fixup() with ->atomic_check() so that
> > a full modeset can be requested from there when crtc_state->active
> > is changed to be true(which implies only connector's DPMS is
> > brought
> > out of "Off" status, though not necessarily).  Bridge functions are
> > added or changed to accommodate the ->atomic_check() callback. 
> > That
> > full modeset is needed by the up-coming patch which gets MIPI DSI
> > controller and PHY ready in ->mode_set(), because it makes sure
> > ->mode_set() and ->atomic_disable() are called in pairs.
> > 
> > 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>
> > ---
> > v2->v3:
> > * Split from the single patch in v2 to clarify changes. (Neil)
> > 
> >  drivers/gpu/drm/bridge/nwl-dsi.c | 61 ++++++++++++++++++++------
> > ------
> >  1 file changed, 39 insertions(+), 22 deletions(-)
> > 
> > diff --git a/drivers/gpu/drm/bridge/nwl-dsi.c
> > b/drivers/gpu/drm/bridge/nwl-dsi.c
> > index 66b67402f1acd..c65ca860712d2 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>
> > @@ -742,7 +743,9 @@ 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;
> > @@ -803,17 +806,6 @@ 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,
> > @@ -831,6 +823,24 @@ 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. */
> > +       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,
> > @@ -862,7 +872,9 @@ nwl_dsi_bridge_mode_set(struct drm_bridge
> > *bridge,
> >         drm_mode_debug_printmodeline(adjusted_mode);
> >  }
> > 
> > -static void nwl_dsi_bridge_pre_enable(struct drm_bridge *bridge)
> > +static void
> > +nwl_dsi_bridge_atomic_pre_enable(struct drm_bridge *bridge,
> > +                                struct drm_bridge_state
> > *old_bridge_state)
> >  {
> >         struct nwl_dsi *dsi = bridge_to_dsi(bridge);
> >         int ret;
> > @@ -897,7 +909,9 @@ static void nwl_dsi_bridge_pre_enable(struct
> > drm_bridge *bridge)
> >         }
> >  }
> > 
> > -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;
> > @@ -942,14 +956,17 @@ 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_pre_enable      = nwl_dsi_bridge_atomic_pre_enable,
> > +       .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)

[PATCH v3 2/3] drm/bridge: nwl-dsi: Remove a check on unchanged HS clock rate from ->mode_set()

[Liu Ying]

The check on unchanged HS clock rate in ->mode_set() improves
the callback's performance a bit by early return.  However,
the up-coming patch would get MIPI DSI controller and PHY ready
in ->mode_set() after that check, thus likely skipped.
So, this patch removes that check to make sure MIPI DSI controller
and PHY will be brought up and taken down from ->mode_set() and
->atomic_disable() respectively in pairs.

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>
---
v2->v3:
* Split from the single patch in v2 to clarify changes. (Neil)

 drivers/gpu/drm/bridge/nwl-dsi.c | 7 -------
 1 file changed, 7 deletions(-)

diff --git a/drivers/gpu/drm/bridge/nwl-dsi.c b/drivers/gpu/drm/bridge/nwl-dsi.c
index c65ca860712d2..601ccc4a7cdc7 100644
--- a/drivers/gpu/drm/bridge/nwl-dsi.c
+++ b/drivers/gpu/drm/bridge/nwl-dsi.c
@@ -856,13 +856,6 @@ 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 */
-- 
2.25.1

Re: [PATCH v3 2/3] drm/bridge: nwl-dsi: Remove a check on unchanged HS clock rate from ->mode_set()

[Neil Armstrong]

On 23/04/2021 11:26, Liu Ying wrote:
> The check on unchanged HS clock rate in ->mode_set() improves
> the callback's performance a bit by early return.  However,
> the up-coming patch would get MIPI DSI controller and PHY ready
> in ->mode_set() after that check, thus likely skipped.
> So, this patch removes that check to make sure MIPI DSI controller
> and PHY will be brought up and taken down from ->mode_set() and
> ->atomic_disable() respectively in pairs.
> 
> 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>
> ---
> v2->v3:
> * Split from the single patch in v2 to clarify changes. (Neil)
> 
>  drivers/gpu/drm/bridge/nwl-dsi.c | 7 -------
>  1 file changed, 7 deletions(-)
> 
> diff --git a/drivers/gpu/drm/bridge/nwl-dsi.c b/drivers/gpu/drm/bridge/nwl-dsi.c
> index c65ca860712d2..601ccc4a7cdc7 100644
> --- a/drivers/gpu/drm/bridge/nwl-dsi.c
> +++ b/drivers/gpu/drm/bridge/nwl-dsi.c
> @@ -856,13 +856,6 @@ 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 */
> 

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

[PATCH v3 3/3] 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->atomic_pre_enable(), which happens after
the panel_funcs->prepare().  So, this patch shifts the bridge operation
ealier from bridge_funcs->atomic_pre_enable() to bridge_funcs->mode_set().
This way, more MIPI DSI panels can connect to this nwl-dsi bridge.

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>
---
v2->v3:
* Split some changes to patch 1/3 and 2/3, to clarify changes. (Neil)

v1->v2:
* Fix a typo in commit message - s/unchange/unchanged/

 drivers/gpu/drm/bridge/nwl-dsi.c | 28 ++++++++++++----------------
 1 file changed, 12 insertions(+), 16 deletions(-)

diff --git a/drivers/gpu/drm/bridge/nwl-dsi.c b/drivers/gpu/drm/bridge/nwl-dsi.c
index 601ccc4a7cdc7..873995f0a7416 100644
--- a/drivers/gpu/drm/bridge/nwl-dsi.c
+++ b/drivers/gpu/drm/bridge/nwl-dsi.c
@@ -662,7 +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;
@@ -834,7 +834,12 @@ static int nwl_dsi_bridge_atomic_check(struct drm_bridge *bridge,
 	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. */
+	/*
+	 * 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;
 
@@ -863,16 +868,8 @@ 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_atomic_pre_enable(struct drm_bridge *bridge,
-				 struct drm_bridge_state *old_bridge_state)
-{
-	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;
@@ -882,22 +879,22 @@ nwl_dsi_bridge_atomic_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;
 	}
 }
@@ -953,7 +950,6 @@ static const struct drm_bridge_funcs nwl_dsi_bridge_funcs = {
 	.atomic_destroy_state	= drm_atomic_helper_bridge_destroy_state,
 	.atomic_reset		= drm_atomic_helper_bridge_reset,
 	.atomic_check		= nwl_dsi_bridge_atomic_check,
-	.atomic_pre_enable	= nwl_dsi_bridge_atomic_pre_enable,
 	.atomic_enable		= nwl_dsi_bridge_atomic_enable,
 	.atomic_disable		= nwl_dsi_bridge_atomic_disable,
 	.mode_set		= nwl_dsi_bridge_mode_set,
-- 
2.25.1

Re: [PATCH v3 3/3] drm/bridge: nwl-dsi: Get MIPI DSI controller and PHY ready in ->mode_set()

[Neil Armstrong]

On 23/04/2021 11:26, 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->atomic_pre_enable(), which happens after
> the panel_funcs->prepare().  So, this patch shifts the bridge operation
> ealier from bridge_funcs->atomic_pre_enable() to bridge_funcs->mode_set().
> This way, more MIPI DSI panels can connect to this nwl-dsi bridge.
> 
> 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>
> ---
> v2->v3:
> * Split some changes to patch 1/3 and 2/3, to clarify changes. (Neil)
> 
> v1->v2:
> * Fix a typo in commit message - s/unchange/unchanged/
> 
>  drivers/gpu/drm/bridge/nwl-dsi.c | 28 ++++++++++++----------------
>  1 file changed, 12 insertions(+), 16 deletions(-)
> 
> diff --git a/drivers/gpu/drm/bridge/nwl-dsi.c b/drivers/gpu/drm/bridge/nwl-dsi.c
> index 601ccc4a7cdc7..873995f0a7416 100644
> --- a/drivers/gpu/drm/bridge/nwl-dsi.c
> +++ b/drivers/gpu/drm/bridge/nwl-dsi.c
> @@ -662,7 +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;
> @@ -834,7 +834,12 @@ static int nwl_dsi_bridge_atomic_check(struct drm_bridge *bridge,
>  	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. */
> +	/*
> +	 * 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;
>  
> @@ -863,16 +868,8 @@ 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_atomic_pre_enable(struct drm_bridge *bridge,
> -				 struct drm_bridge_state *old_bridge_state)
> -{
> -	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;
> @@ -882,22 +879,22 @@ nwl_dsi_bridge_atomic_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;
>  	}
>  }
> @@ -953,7 +950,6 @@ static const struct drm_bridge_funcs nwl_dsi_bridge_funcs = {
>  	.atomic_destroy_state	= drm_atomic_helper_bridge_destroy_state,
>  	.atomic_reset		= drm_atomic_helper_bridge_reset,
>  	.atomic_check		= nwl_dsi_bridge_atomic_check,
> -	.atomic_pre_enable	= nwl_dsi_bridge_atomic_pre_enable,
>  	.atomic_enable		= nwl_dsi_bridge_atomic_enable,
>  	.atomic_disable		= nwl_dsi_bridge_atomic_disable,
>  	.mode_set		= nwl_dsi_bridge_mode_set,
> 

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

Re: [PATCH v3 0/3] drm/bridge: nwl-dsi: Get MIPI DSI controller and PHY ready in ->mode_set()

[Neil Armstrong]

On 23/04/2021 11:26, Liu Ying wrote:
> Hi,
> 
> This series aims to make the nwl-dsi bridge be able to connect with
> more MIPI DSI panels.  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.
> However, the existing 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 series shifts the bridge operation
> ealier from bridge_funcs->pre_enable() to bridge_funcs->mode_set().
> 
> Patch 3/3 does the essential bridge operation shift.
> 
> Patch 1/3 and 2/3 are split from the original single patch in v2 and
> are needed by patch 3/3.  This split-up helps clarify changes better.
> The split-up is done in this way:
> 
> 1) Patch 1/3 forces a full modeset when crtc_state->active is changed to
>    be true(which implies only connector's DPMS is brought out of "Off"
>    status, though not necessarily).  This makes sure ->mode_set() and
>    ->atomic_disable() will be called in pairs.
> 2) Patch 2/3 removes a check on unchanged HS clock rate from ->mode_set(),
>    to make sure MIPI DSI controller and PHY are brought up and taken down
>    in pairs.
> 3) Patch 3/3 shifts the bridge operation as the last step.
> 
> 
> v2->v3:
> * Split the single patch in v2 into 3 patches. (Neil)
> 
> v1->v2:
> * Fix a typo in commit message - s/unchange/unchanged/
> 
> 
> Liu Ying (3):
>   drm/bridge: nwl-dsi: Force a full modeset when crtc_state->active is
>     changed to be true
>   drm/bridge: nwl-dsi: Remove a check on unchanged HS clock rate from
>     ->mode_set()
>   drm/bridge: nwl-dsi: Get MIPI DSI controller and PHY ready in
>     ->mode_set()
> 
>  drivers/gpu/drm/bridge/nwl-dsi.c | 86 +++++++++++++++++---------------
>  1 file changed, 46 insertions(+), 40 deletions(-)
> 

Applying to drm-misc-next

Thanks,
Neil

Re: [PATCH v3 0/3] drm/bridge: nwl-dsi: Get MIPI DSI controller and PHY ready in ->mode_set()

[Guido Günther]

Hi Liu,
On Fri, Apr 23, 2021 at 05:26:40PM +0800, Liu Ying wrote:
> Hi,
> 
> This series aims to make the nwl-dsi bridge be able to connect with
> more MIPI DSI panels.  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.
> However, the existing 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 series shifts the bridge operation
> ealier from bridge_funcs->pre_enable() to bridge_funcs->mode_set().
> 
> Patch 3/3 does the essential bridge operation shift.
> 
> Patch 1/3 and 2/3 are split from the original single patch in v2 and
> are needed by patch 3/3.  This split-up helps clarify changes better.
> The split-up is done in this way:
> 
> 1) Patch 1/3 forces a full modeset when crtc_state->active is changed to
>    be true(which implies only connector's DPMS is brought out of "Off"
>    status, though not necessarily).  This makes sure ->mode_set() and
>    ->atomic_disable() will be called in pairs.
> 2) Patch 2/3 removes a check on unchanged HS clock rate from ->mode_set(),
>    to make sure MIPI DSI controller and PHY are brought up and taken down
>    in pairs.
> 3) Patch 3/3 shifts the bridge operation as the last step.

Looks good to me and tested on imx8mq Librem 5 Devkit with

https://lore.kernel.org/linux-arm-kernel/cover.1617968250.git.agx@sigxcpu.org/

on top so

Reviewed-by: Guido Günther <agx@sigxcpu.org>
Tested-by: Guido Günther <agx@sigxcpu.org>

Cheers,
 -- Guido

> 
> 
> v2->v3:
> * Split the single patch in v2 into 3 patches. (Neil)
> 
> v1->v2:
> * Fix a typo in commit message - s/unchange/unchanged/
> 
> 
> Liu Ying (3):
>   drm/bridge: nwl-dsi: Force a full modeset when crtc_state->active is
>     changed to be true
>   drm/bridge: nwl-dsi: Remove a check on unchanged HS clock rate from
>     ->mode_set()
>   drm/bridge: nwl-dsi: Get MIPI DSI controller and PHY ready in
>     ->mode_set()
> 
>  drivers/gpu/drm/bridge/nwl-dsi.c | 86 +++++++++++++++++---------------
>  1 file changed, 46 insertions(+), 40 deletions(-)
> 
> -- 
> 2.25.1
>