[PATCH v6 0/6] drm: lcdif: Add i.MX93 LCDIF support

[PATCH v6 0/6] drm: lcdif: Add i.MX93 LCDIF support

[Liu Ying]

Hi,

This patch set aims to add i.MX93 LCDIF display controller support
in the existing LCDIF DRM driver.  The LCDIF embedded in i.MX93 SoC
is essentially the same to those embedded in i.MX8mp SoC.  Through
internal bridges, i.MX93 LCDIF may drive a MIPI DSI display or a LVDS
display or a parallel display.

Patch 1/6 adds device tree binding support for i.MX93 LCDIF in the
existing fsl,lcdif.yaml.

Patch 2/6 drops lcdif->bridge NULL pointer check as a cleanup patch.

Patch 3/6~5/6 prepare for adding i.MX93 LCDIF support step by step.

Patch 6/6 adds i.MX93 LCDIF compatible string as the last step of
adding i.MX93 LCDIF support.

v5->v6:
* Collect Marek's R-b tags on patch 3/6, 4/6 and 6/6.
* Keep default MEDIA_BUS_FMT_RGB888_1X24 bus format in patch 2/6 in case
  bridge_state->input_bus_cfg.format is zero. (Marek)
* Drop MAX_DISPLAYS macro in patch 5/6. (Marek)
* Drop the encoder member in struct lcdif_drm_private in patch 5/6.
* Drop endpoint id check in patch 5/6.
* Allocate encoders by calling devm_kzalloc() in patch 5/6.

v4->v5:
* Rebase this patch set upon v6.4-rc1 and resolve a trivial conflict for
  patch 5/6.
* Collect Alexander's R-b tag on patch 3/6, A-b tags on patch 4/6 and 5/6,
  T-b tags on patch 2/6~6/6.

v3->v4:
* Improve warning message when ignoring invalid LCDIF OF endpoint ids in
  patch 5/6. (Alexander)
* Use 'new_{c,p}state' instead of 'new_{crtc,plane}_state' in patch 3/6.
  (Alexander)
* Simplify lcdif_crtc_reset() by calling lcdif_crtc_atomic_destroy_state()
  in patch 3/6. (Alexander)
* Add '!crtc->state' check in lcdif_crtc_atomic_duplicate_state() in patch 3/6.
  (Alexander)
* Collect Alexander's R-b tags on patch 1/6, 2/6 and 6/6.

v2->v3:
* Fix a trivial typo in patch 6/6's commit message.

v1->v2:
* Add Krzysztof's A-b and Marek's R-b tags on patch 1/6.
* Split patch 2/2 in v1 into patch 2/6~6/6 in v2. (Marek, Alexander)
* Drop '!remote ||' from lcdif_attach_bridge(). (Lothar)
* Add comment on the 'base' member of lcdif_crtc_state structure to
  note it should always be the first member. (Lothar)
* Drop unneeded 'bridges' member from lcdif_drm_private structure.
* Drop a comment about bridge input bus format from lcdif_crtc_atomic_check().


Liu Ying (6):
  dt-bindings: lcdif: Add i.MX93 LCDIF support
  drm: lcdif: Drop unnecessary NULL pointer check on lcdif->bridge
  drm: lcdif: Determine bus format and flags in ->atomic_check()
  drm: lcdif: Check consistent bus format and flags across first bridges
  drm: lcdif: Add multiple encoders and first bridges support
  drm: lcdif: Add i.MX93 LCDIF compatible string

 .../bindings/display/fsl,lcdif.yaml           |   7 +-
 drivers/gpu/drm/mxsfb/lcdif_drv.c             |  73 ++++++-
 drivers/gpu/drm/mxsfb/lcdif_drv.h             |   3 -
 drivers/gpu/drm/mxsfb/lcdif_kms.c             | 201 ++++++++++++------
 4 files changed, 208 insertions(+), 76 deletions(-)

-- 
2.37.1

[PATCH v6 0/6] drm: lcdif: Add i.MX93 LCDIF support

[Liu Ying]

Hi,

This patch set aims to add i.MX93 LCDIF display controller support
in the existing LCDIF DRM driver.  The LCDIF embedded in i.MX93 SoC
is essentially the same to those embedded in i.MX8mp SoC.  Through
internal bridges, i.MX93 LCDIF may drive a MIPI DSI display or a LVDS
display or a parallel display.

Patch 1/6 adds device tree binding support for i.MX93 LCDIF in the
existing fsl,lcdif.yaml.

Patch 2/6 drops lcdif->bridge NULL pointer check as a cleanup patch.

Patch 3/6~5/6 prepare for adding i.MX93 LCDIF support step by step.

Patch 6/6 adds i.MX93 LCDIF compatible string as the last step of
adding i.MX93 LCDIF support.

v5->v6:
* Collect Marek's R-b tags on patch 3/6, 4/6 and 6/6.
* Keep default MEDIA_BUS_FMT_RGB888_1X24 bus format in patch 2/6 in case
  bridge_state->input_bus_cfg.format is zero. (Marek)
* Drop MAX_DISPLAYS macro in patch 5/6. (Marek)
* Drop the encoder member in struct lcdif_drm_private in patch 5/6.
* Drop endpoint id check in patch 5/6.
* Allocate encoders by calling devm_kzalloc() in patch 5/6.

v4->v5:
* Rebase this patch set upon v6.4-rc1 and resolve a trivial conflict for
  patch 5/6.
* Collect Alexander's R-b tag on patch 3/6, A-b tags on patch 4/6 and 5/6,
  T-b tags on patch 2/6~6/6.

v3->v4:
* Improve warning message when ignoring invalid LCDIF OF endpoint ids in
  patch 5/6. (Alexander)
* Use 'new_{c,p}state' instead of 'new_{crtc,plane}_state' in patch 3/6.
  (Alexander)
* Simplify lcdif_crtc_reset() by calling lcdif_crtc_atomic_destroy_state()
  in patch 3/6. (Alexander)
* Add '!crtc->state' check in lcdif_crtc_atomic_duplicate_state() in patch 3/6.
  (Alexander)
* Collect Alexander's R-b tags on patch 1/6, 2/6 and 6/6.

v2->v3:
* Fix a trivial typo in patch 6/6's commit message.

v1->v2:
* Add Krzysztof's A-b and Marek's R-b tags on patch 1/6.
* Split patch 2/2 in v1 into patch 2/6~6/6 in v2. (Marek, Alexander)
* Drop '!remote ||' from lcdif_attach_bridge(). (Lothar)
* Add comment on the 'base' member of lcdif_crtc_state structure to
  note it should always be the first member. (Lothar)
* Drop unneeded 'bridges' member from lcdif_drm_private structure.
* Drop a comment about bridge input bus format from lcdif_crtc_atomic_check().


Liu Ying (6):
  dt-bindings: lcdif: Add i.MX93 LCDIF support
  drm: lcdif: Drop unnecessary NULL pointer check on lcdif->bridge
  drm: lcdif: Determine bus format and flags in ->atomic_check()
  drm: lcdif: Check consistent bus format and flags across first bridges
  drm: lcdif: Add multiple encoders and first bridges support
  drm: lcdif: Add i.MX93 LCDIF compatible string

 .../bindings/display/fsl,lcdif.yaml           |   7 +-
 drivers/gpu/drm/mxsfb/lcdif_drv.c             |  73 ++++++-
 drivers/gpu/drm/mxsfb/lcdif_drv.h             |   3 -
 drivers/gpu/drm/mxsfb/lcdif_kms.c             | 201 ++++++++++++------
 4 files changed, 208 insertions(+), 76 deletions(-)

-- 
2.37.1

[PATCH v6 1/6] dt-bindings: lcdif: Add i.MX93 LCDIF support

[Liu Ying]

There is one LCDIF embedded in i.MX93 SoC to connect with
MIPI DSI controller through LCDIF cross line pattern(controlled
by mediamix blk-ctrl) or connect with LVDS display bridge(LDB)
directly or connect with a parallel display through parallel
display format(also controlled by mediamix blk-ctrl).  i.MX93
LCDIF IP is essentially the same to i.MX8MP LCDIF IP.  Add device
tree binding for i.MX93 LCDIF.

Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Marek Vasut <marex@denx.de>
Reviewed-by: Alexander Stein <alexander.stein@ew.tq-group.com>
Signed-off-by: Liu Ying <victor.liu@nxp.com>
---
v5->v6:
* No change.

v4->v5:
* No change.

v3->v4:
* Add Alexander's R-b tag.

v2->v3:
* No change.

v1->v2:
* Add Krzysztof's A-b and Marek's R-b tags.

 Documentation/devicetree/bindings/display/fsl,lcdif.yaml | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/display/fsl,lcdif.yaml b/Documentation/devicetree/bindings/display/fsl,lcdif.yaml
index 75b4efd70ba8..fc11ab5fc465 100644
--- a/Documentation/devicetree/bindings/display/fsl,lcdif.yaml
+++ b/Documentation/devicetree/bindings/display/fsl,lcdif.yaml
@@ -21,6 +21,7 @@ properties:
           - fsl,imx28-lcdif
           - fsl,imx6sx-lcdif
           - fsl,imx8mp-lcdif
+          - fsl,imx93-lcdif
       - items:
           - enum:
               - fsl,imx6sl-lcdif
@@ -88,7 +89,9 @@ allOf:
       properties:
         compatible:
           contains:
-            const: fsl,imx8mp-lcdif
+            enum:
+              - fsl,imx8mp-lcdif
+              - fsl,imx93-lcdif
     then:
       properties:
         clocks:
@@ -107,6 +110,7 @@ allOf:
               enum:
                 - fsl,imx6sx-lcdif
                 - fsl,imx8mp-lcdif
+                - fsl,imx93-lcdif
     then:
       properties:
         clocks:
@@ -123,6 +127,7 @@ allOf:
               - fsl,imx8mm-lcdif
               - fsl,imx8mn-lcdif
               - fsl,imx8mp-lcdif
+              - fsl,imx93-lcdif
     then:
       required:
         - power-domains
-- 
2.37.1

[PATCH v6 1/6] dt-bindings: lcdif: Add i.MX93 LCDIF support

[Liu Ying]

There is one LCDIF embedded in i.MX93 SoC to connect with
MIPI DSI controller through LCDIF cross line pattern(controlled
by mediamix blk-ctrl) or connect with LVDS display bridge(LDB)
directly or connect with a parallel display through parallel
display format(also controlled by mediamix blk-ctrl).  i.MX93
LCDIF IP is essentially the same to i.MX8MP LCDIF IP.  Add device
tree binding for i.MX93 LCDIF.

Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Marek Vasut <marex@denx.de>
Reviewed-by: Alexander Stein <alexander.stein@ew.tq-group.com>
Signed-off-by: Liu Ying <victor.liu@nxp.com>
---
v5->v6:
* No change.

v4->v5:
* No change.

v3->v4:
* Add Alexander's R-b tag.

v2->v3:
* No change.

v1->v2:
* Add Krzysztof's A-b and Marek's R-b tags.

 Documentation/devicetree/bindings/display/fsl,lcdif.yaml | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/display/fsl,lcdif.yaml b/Documentation/devicetree/bindings/display/fsl,lcdif.yaml
index 75b4efd70ba8..fc11ab5fc465 100644
--- a/Documentation/devicetree/bindings/display/fsl,lcdif.yaml
+++ b/Documentation/devicetree/bindings/display/fsl,lcdif.yaml
@@ -21,6 +21,7 @@ properties:
           - fsl,imx28-lcdif
           - fsl,imx6sx-lcdif
           - fsl,imx8mp-lcdif
+          - fsl,imx93-lcdif
       - items:
           - enum:
               - fsl,imx6sl-lcdif
@@ -88,7 +89,9 @@ allOf:
       properties:
         compatible:
           contains:
-            const: fsl,imx8mp-lcdif
+            enum:
+              - fsl,imx8mp-lcdif
+              - fsl,imx93-lcdif
     then:
       properties:
         clocks:
@@ -107,6 +110,7 @@ allOf:
               enum:
                 - fsl,imx6sx-lcdif
                 - fsl,imx8mp-lcdif
+                - fsl,imx93-lcdif
     then:
       properties:
         clocks:
@@ -123,6 +127,7 @@ allOf:
               - fsl,imx8mm-lcdif
               - fsl,imx8mn-lcdif
               - fsl,imx8mp-lcdif
+              - fsl,imx93-lcdif
     then:
       required:
         - power-domains
-- 
2.37.1

[PATCH v6 2/6] drm: lcdif: Drop unnecessary NULL pointer check on lcdif->bridge

[Liu Ying]

A valid bridge is already found in lcdif_attach_bridge() and set
to lcdif->bridge, so lcdif->bridge cannot be a NULL pointer. Drop
the unnecessary NULL pointer check in KMS stage.

Tested-by: Alexander Stein <alexander.stein@ew.tq-group.com>
Reviewed-by: Alexander Stein <alexander.stein@ew.tq-group.com>
Signed-off-by: Liu Ying <victor.liu@nxp.com>
---
v5->v6:
* Keep default MEDIA_BUS_FMT_RGB888_1X24 bus format in case
  bridge_state->input_bus_cfg.format is zero. (Marek)

v4->v5:
* Add Alexander's T-b tag.

v3->v4:
* Add Alexander's R-b tag.

v2->v3:
* No change.

v1->v2:
* Split from patch 2/2 in v1. (Marek, Alexander)

 drivers/gpu/drm/mxsfb/lcdif_kms.c | 36 +++++++++++++------------------
 1 file changed, 15 insertions(+), 21 deletions(-)

diff --git a/drivers/gpu/drm/mxsfb/lcdif_kms.c b/drivers/gpu/drm/mxsfb/lcdif_kms.c
index 262bc43b1079..ba00a155d9b6 100644
--- a/drivers/gpu/drm/mxsfb/lcdif_kms.c
+++ b/drivers/gpu/drm/mxsfb/lcdif_kms.c
@@ -394,7 +394,7 @@ static void lcdif_crtc_mode_set_nofb(struct lcdif_drm_private *lcdif,
 	struct drm_display_mode *m = &lcdif->crtc.state->adjusted_mode;
 	u32 bus_flags = 0;
 
-	if (lcdif->bridge && lcdif->bridge->timings)
+	if (lcdif->bridge->timings)
 		bus_flags = lcdif->bridge->timings->input_bus_flags;
 	else if (bridge_state)
 		bus_flags = bridge_state->input_bus_cfg.flags;
@@ -463,30 +463,24 @@ static void lcdif_crtc_atomic_enable(struct drm_crtc *crtc,
 	struct drm_display_mode *m = &lcdif->crtc.state->adjusted_mode;
 	struct drm_bridge_state *bridge_state = NULL;
 	struct drm_device *drm = lcdif->drm;
-	u32 bus_format = 0;
+	u32 bus_format;
 	dma_addr_t paddr;
 
-	/* If there is a bridge attached to the LCDIF, use its bus format */
-	if (lcdif->bridge) {
-		bridge_state =
-			drm_atomic_get_new_bridge_state(state,
-							lcdif->bridge);
-		if (!bridge_state)
-			bus_format = MEDIA_BUS_FMT_FIXED;
-		else
-			bus_format = bridge_state->input_bus_cfg.format;
-
-		if (bus_format == MEDIA_BUS_FMT_FIXED) {
-			dev_warn_once(drm->dev,
-				      "Bridge does not provide bus format, assuming MEDIA_BUS_FMT_RGB888_1X24.\n"
-				      "Please fix bridge driver by handling atomic_get_input_bus_fmts.\n");
-			bus_format = MEDIA_BUS_FMT_RGB888_1X24;
-		}
-	}
+	bridge_state = drm_atomic_get_new_bridge_state(state, lcdif->bridge);
+	if (!bridge_state)
+		bus_format = MEDIA_BUS_FMT_FIXED;
+	else
+		bus_format = bridge_state->input_bus_cfg.format;
 
-	/* If all else fails, default to RGB888_1X24 */
-	if (!bus_format)
+	if (bus_format == MEDIA_BUS_FMT_FIXED) {
+		dev_warn_once(drm->dev,
+			      "Bridge does not provide bus format, assuming MEDIA_BUS_FMT_RGB888_1X24.\n"
+			      "Please fix bridge driver by handling atomic_get_input_bus_fmts.\n");
 		bus_format = MEDIA_BUS_FMT_RGB888_1X24;
+	} else if (!bus_format) {
+		/* If all else fails, default to RGB888_1X24 */
+		bus_format = MEDIA_BUS_FMT_RGB888_1X24;
+	}
 
 	clk_set_rate(lcdif->clk, m->crtc_clock * 1000);
 
-- 
2.37.1

[PATCH v6 2/6] drm: lcdif: Drop unnecessary NULL pointer check on lcdif->bridge

[Liu Ying]

A valid bridge is already found in lcdif_attach_bridge() and set
to lcdif->bridge, so lcdif->bridge cannot be a NULL pointer. Drop
the unnecessary NULL pointer check in KMS stage.

Tested-by: Alexander Stein <alexander.stein@ew.tq-group.com>
Reviewed-by: Alexander Stein <alexander.stein@ew.tq-group.com>
Signed-off-by: Liu Ying <victor.liu@nxp.com>
---
v5->v6:
* Keep default MEDIA_BUS_FMT_RGB888_1X24 bus format in case
  bridge_state->input_bus_cfg.format is zero. (Marek)

v4->v5:
* Add Alexander's T-b tag.

v3->v4:
* Add Alexander's R-b tag.

v2->v3:
* No change.

v1->v2:
* Split from patch 2/2 in v1. (Marek, Alexander)

 drivers/gpu/drm/mxsfb/lcdif_kms.c | 36 +++++++++++++------------------
 1 file changed, 15 insertions(+), 21 deletions(-)

diff --git a/drivers/gpu/drm/mxsfb/lcdif_kms.c b/drivers/gpu/drm/mxsfb/lcdif_kms.c
index 262bc43b1079..ba00a155d9b6 100644
--- a/drivers/gpu/drm/mxsfb/lcdif_kms.c
+++ b/drivers/gpu/drm/mxsfb/lcdif_kms.c
@@ -394,7 +394,7 @@ static void lcdif_crtc_mode_set_nofb(struct lcdif_drm_private *lcdif,
 	struct drm_display_mode *m = &lcdif->crtc.state->adjusted_mode;
 	u32 bus_flags = 0;
 
-	if (lcdif->bridge && lcdif->bridge->timings)
+	if (lcdif->bridge->timings)
 		bus_flags = lcdif->bridge->timings->input_bus_flags;
 	else if (bridge_state)
 		bus_flags = bridge_state->input_bus_cfg.flags;
@@ -463,30 +463,24 @@ static void lcdif_crtc_atomic_enable(struct drm_crtc *crtc,
 	struct drm_display_mode *m = &lcdif->crtc.state->adjusted_mode;
 	struct drm_bridge_state *bridge_state = NULL;
 	struct drm_device *drm = lcdif->drm;
-	u32 bus_format = 0;
+	u32 bus_format;
 	dma_addr_t paddr;
 
-	/* If there is a bridge attached to the LCDIF, use its bus format */
-	if (lcdif->bridge) {
-		bridge_state =
-			drm_atomic_get_new_bridge_state(state,
-							lcdif->bridge);
-		if (!bridge_state)
-			bus_format = MEDIA_BUS_FMT_FIXED;
-		else
-			bus_format = bridge_state->input_bus_cfg.format;
-
-		if (bus_format == MEDIA_BUS_FMT_FIXED) {
-			dev_warn_once(drm->dev,
-				      "Bridge does not provide bus format, assuming MEDIA_BUS_FMT_RGB888_1X24.\n"
-				      "Please fix bridge driver by handling atomic_get_input_bus_fmts.\n");
-			bus_format = MEDIA_BUS_FMT_RGB888_1X24;
-		}
-	}
+	bridge_state = drm_atomic_get_new_bridge_state(state, lcdif->bridge);
+	if (!bridge_state)
+		bus_format = MEDIA_BUS_FMT_FIXED;
+	else
+		bus_format = bridge_state->input_bus_cfg.format;
 
-	/* If all else fails, default to RGB888_1X24 */
-	if (!bus_format)
+	if (bus_format == MEDIA_BUS_FMT_FIXED) {
+		dev_warn_once(drm->dev,
+			      "Bridge does not provide bus format, assuming MEDIA_BUS_FMT_RGB888_1X24.\n"
+			      "Please fix bridge driver by handling atomic_get_input_bus_fmts.\n");
 		bus_format = MEDIA_BUS_FMT_RGB888_1X24;
+	} else if (!bus_format) {
+		/* If all else fails, default to RGB888_1X24 */
+		bus_format = MEDIA_BUS_FMT_RGB888_1X24;
+	}
 
 	clk_set_rate(lcdif->clk, m->crtc_clock * 1000);
 
-- 
2.37.1

[PATCH v6 3/6] drm: lcdif: Determine bus format and flags in ->atomic_check()

[Liu Ying]

Instead of determining LCDIF output bus format and bus flags in
->atomic_enable(), do that in ->atomic_check().  This is a
preparation for the upcoming patch to check consistent bus format
and bus flags across all first downstream bridges in ->atomic_check().
New lcdif_crtc_state structure is introduced to cache bus format
and bus flags states in ->atomic_check() so that they can be read
in ->atomic_enable().

Tested-by: Alexander Stein <alexander.stein@ew.tq-group.com>
Reviewed-by: Alexander Stein <alexander.stein@ew.tq-group.com>
Reviewed-by: Marek Vasut <marex@denx.de>
Signed-off-by: Liu Ying <victor.liu@nxp.com>
---
v5->v6:
* Add Marek's R-b tag.
* A slight change brought from the update in patch 2/6 to keep default
  MEDIA_BUS_FMT_RGB888_1X24 bus format.

v4->v5:
* Add Alexander's R-b and T-b tags.

v3->v4:
* Use 'new_{c,p}state' instead of 'new_{crtc,plane}_state'. (Alexander)
* Simplify lcdif_crtc_reset() by calling lcdif_crtc_atomic_destroy_state().
  (Alexander)
* Add '!crtc->state' check in lcdif_crtc_atomic_duplicate_state(). (Alexander)

v2->v3:
* No change.

v1->v2:
* Split from patch 2/2 in v1. (Marek, Alexander)
* Add comment on the 'base' member of lcdif_crtc_state structure to
  note it should always be the first member. (Lothar)

 drivers/gpu/drm/mxsfb/lcdif_kms.c | 140 ++++++++++++++++++++++--------
 1 file changed, 102 insertions(+), 38 deletions(-)

diff --git a/drivers/gpu/drm/mxsfb/lcdif_kms.c b/drivers/gpu/drm/mxsfb/lcdif_kms.c
index ba00a155d9b6..fab2253e4786 100644
--- a/drivers/gpu/drm/mxsfb/lcdif_kms.c
+++ b/drivers/gpu/drm/mxsfb/lcdif_kms.c
@@ -30,6 +30,18 @@
 #include "lcdif_drv.h"
 #include "lcdif_regs.h"
 
+struct lcdif_crtc_state {
+	struct drm_crtc_state	base;	/* always be the first member */
+	u32			bus_format;
+	u32			bus_flags;
+};
+
+static inline struct lcdif_crtc_state *
+to_lcdif_crtc_state(struct drm_crtc_state *s)
+{
+	return container_of(s, struct lcdif_crtc_state, base);
+}
+
 /* -----------------------------------------------------------------------------
  * CRTC
  */
@@ -385,48 +397,75 @@ static void lcdif_reset_block(struct lcdif_drm_private *lcdif)
 	readl(lcdif->base + LCDC_V8_CTRL);
 }
 
-static void lcdif_crtc_mode_set_nofb(struct lcdif_drm_private *lcdif,
-				     struct drm_plane_state *plane_state,
-				     struct drm_bridge_state *bridge_state,
-				     const u32 bus_format)
+static void lcdif_crtc_mode_set_nofb(struct drm_crtc_state *crtc_state,
+				     struct drm_plane_state *plane_state)
 {
-	struct drm_device *drm = lcdif->crtc.dev;
-	struct drm_display_mode *m = &lcdif->crtc.state->adjusted_mode;
-	u32 bus_flags = 0;
-
-	if (lcdif->bridge->timings)
-		bus_flags = lcdif->bridge->timings->input_bus_flags;
-	else if (bridge_state)
-		bus_flags = bridge_state->input_bus_cfg.flags;
+	struct lcdif_crtc_state *lcdif_crtc_state = to_lcdif_crtc_state(crtc_state);
+	struct drm_device *drm = crtc_state->crtc->dev;
+	struct lcdif_drm_private *lcdif = to_lcdif_drm_private(drm);
+	struct drm_display_mode *m = &crtc_state->adjusted_mode;
 
 	DRM_DEV_DEBUG_DRIVER(drm->dev, "Pixel clock: %dkHz (actual: %dkHz)\n",
 			     m->crtc_clock,
 			     (int)(clk_get_rate(lcdif->clk) / 1000));
 	DRM_DEV_DEBUG_DRIVER(drm->dev, "Bridge bus_flags: 0x%08X\n",
-			     bus_flags);
+			     lcdif_crtc_state->bus_flags);
 	DRM_DEV_DEBUG_DRIVER(drm->dev, "Mode flags: 0x%08X\n", m->flags);
 
 	/* Mandatory eLCDIF reset as per the Reference Manual */
 	lcdif_reset_block(lcdif);
 
-	lcdif_set_formats(lcdif, plane_state, bus_format);
+	lcdif_set_formats(lcdif, plane_state, lcdif_crtc_state->bus_format);
 
-	lcdif_set_mode(lcdif, bus_flags);
+	lcdif_set_mode(lcdif, lcdif_crtc_state->bus_flags);
 }
 
 static int lcdif_crtc_atomic_check(struct drm_crtc *crtc,
 				   struct drm_atomic_state *state)
 {
+	struct drm_device *drm = crtc->dev;
+	struct lcdif_drm_private *lcdif = to_lcdif_drm_private(drm);
 	struct drm_crtc_state *crtc_state = drm_atomic_get_new_crtc_state(state,
 									  crtc);
+	struct lcdif_crtc_state *lcdif_crtc_state = to_lcdif_crtc_state(crtc_state);
 	bool has_primary = crtc_state->plane_mask &
 			   drm_plane_mask(crtc->primary);
+	struct drm_bridge_state *bridge_state;
+	struct drm_bridge *bridge = lcdif->bridge;
+	int ret;
 
 	/* The primary plane has to be enabled when the CRTC is active. */
 	if (crtc_state->active && !has_primary)
 		return -EINVAL;
 
-	return drm_atomic_add_affected_planes(state, crtc);
+	ret = drm_atomic_add_affected_planes(state, crtc);
+	if (ret)
+		return ret;
+
+	bridge_state = drm_atomic_get_new_bridge_state(state, bridge);
+	if (!bridge_state)
+		lcdif_crtc_state->bus_format = MEDIA_BUS_FMT_FIXED;
+	else
+		lcdif_crtc_state->bus_format = bridge_state->input_bus_cfg.format;
+
+	if (lcdif_crtc_state->bus_format == MEDIA_BUS_FMT_FIXED) {
+		dev_warn_once(drm->dev,
+			      "Bridge does not provide bus format, assuming MEDIA_BUS_FMT_RGB888_1X24.\n"
+			      "Please fix bridge driver by handling atomic_get_input_bus_fmts.\n");
+		lcdif_crtc_state->bus_format = MEDIA_BUS_FMT_RGB888_1X24;
+	} else if (!lcdif_crtc_state->bus_format) {
+		/* If all else fails, default to RGB888_1X24 */
+		lcdif_crtc_state->bus_format = MEDIA_BUS_FMT_RGB888_1X24;
+	}
+
+	if (bridge->timings)
+		lcdif_crtc_state->bus_flags = bridge->timings->input_bus_flags;
+	else if (bridge_state)
+		lcdif_crtc_state->bus_flags = bridge_state->input_bus_cfg.flags;
+	else
+		lcdif_crtc_state->bus_flags = 0;
+
+	return 0;
 }
 
 static void lcdif_crtc_atomic_flush(struct drm_crtc *crtc,
@@ -458,35 +497,18 @@ static void lcdif_crtc_atomic_enable(struct drm_crtc *crtc,
 				     struct drm_atomic_state *state)
 {
 	struct lcdif_drm_private *lcdif = to_lcdif_drm_private(crtc->dev);
+	struct drm_crtc_state *new_cstate = drm_atomic_get_new_crtc_state(state, crtc);
 	struct drm_plane_state *new_pstate = drm_atomic_get_new_plane_state(state,
 									    crtc->primary);
 	struct drm_display_mode *m = &lcdif->crtc.state->adjusted_mode;
-	struct drm_bridge_state *bridge_state = NULL;
 	struct drm_device *drm = lcdif->drm;
-	u32 bus_format;
 	dma_addr_t paddr;
 
-	bridge_state = drm_atomic_get_new_bridge_state(state, lcdif->bridge);
-	if (!bridge_state)
-		bus_format = MEDIA_BUS_FMT_FIXED;
-	else
-		bus_format = bridge_state->input_bus_cfg.format;
-
-	if (bus_format == MEDIA_BUS_FMT_FIXED) {
-		dev_warn_once(drm->dev,
-			      "Bridge does not provide bus format, assuming MEDIA_BUS_FMT_RGB888_1X24.\n"
-			      "Please fix bridge driver by handling atomic_get_input_bus_fmts.\n");
-		bus_format = MEDIA_BUS_FMT_RGB888_1X24;
-	} else if (!bus_format) {
-		/* If all else fails, default to RGB888_1X24 */
-		bus_format = MEDIA_BUS_FMT_RGB888_1X24;
-	}
-
 	clk_set_rate(lcdif->clk, m->crtc_clock * 1000);
 
 	pm_runtime_get_sync(drm->dev);
 
-	lcdif_crtc_mode_set_nofb(lcdif, new_pstate, bridge_state, bus_format);
+	lcdif_crtc_mode_set_nofb(new_cstate, new_pstate);
 
 	/* Write cur_buf as well to avoid an initial corrupt frame */
 	paddr = drm_fb_dma_get_gem_addr(new_pstate->fb, new_pstate, 0);
@@ -523,6 +545,48 @@ static void lcdif_crtc_atomic_disable(struct drm_crtc *crtc,
 	pm_runtime_put_sync(drm->dev);
 }
 
+static void lcdif_crtc_atomic_destroy_state(struct drm_crtc *crtc,
+					    struct drm_crtc_state *state)
+{
+	__drm_atomic_helper_crtc_destroy_state(state);
+	kfree(to_lcdif_crtc_state(state));
+}
+
+static void lcdif_crtc_reset(struct drm_crtc *crtc)
+{
+	struct lcdif_crtc_state *state;
+
+	if (crtc->state)
+		lcdif_crtc_atomic_destroy_state(crtc, crtc->state);
+
+	crtc->state = NULL;
+
+	state = kzalloc(sizeof(*state), GFP_KERNEL);
+	if (state)
+		__drm_atomic_helper_crtc_reset(crtc, &state->base);
+}
+
+static struct drm_crtc_state *
+lcdif_crtc_atomic_duplicate_state(struct drm_crtc *crtc)
+{
+	struct lcdif_crtc_state *old = to_lcdif_crtc_state(crtc->state);
+	struct lcdif_crtc_state *new;
+
+	if (WARN_ON(!crtc->state))
+		return NULL;
+
+	new = kzalloc(sizeof(*new), GFP_KERNEL);
+	if (!new)
+		return NULL;
+
+	__drm_atomic_helper_crtc_duplicate_state(crtc, &new->base);
+
+	new->bus_format = old->bus_format;
+	new->bus_flags = old->bus_flags;
+
+	return &new->base;
+}
+
 static int lcdif_crtc_enable_vblank(struct drm_crtc *crtc)
 {
 	struct lcdif_drm_private *lcdif = to_lcdif_drm_private(crtc->dev);
@@ -551,12 +615,12 @@ static const struct drm_crtc_helper_funcs lcdif_crtc_helper_funcs = {
 };
 
 static const struct drm_crtc_funcs lcdif_crtc_funcs = {
-	.reset = drm_atomic_helper_crtc_reset,
+	.reset = lcdif_crtc_reset,
 	.destroy = drm_crtc_cleanup,
 	.set_config = drm_atomic_helper_set_config,
 	.page_flip = drm_atomic_helper_page_flip,
-	.atomic_duplicate_state = drm_atomic_helper_crtc_duplicate_state,
-	.atomic_destroy_state = drm_atomic_helper_crtc_destroy_state,
+	.atomic_duplicate_state = lcdif_crtc_atomic_duplicate_state,
+	.atomic_destroy_state = lcdif_crtc_atomic_destroy_state,
 	.enable_vblank = lcdif_crtc_enable_vblank,
 	.disable_vblank = lcdif_crtc_disable_vblank,
 };
-- 
2.37.1

[PATCH v6 3/6] drm: lcdif: Determine bus format and flags in ->atomic_check()

[Liu Ying]

Instead of determining LCDIF output bus format and bus flags in
->atomic_enable(), do that in ->atomic_check().  This is a
preparation for the upcoming patch to check consistent bus format
and bus flags across all first downstream bridges in ->atomic_check().
New lcdif_crtc_state structure is introduced to cache bus format
and bus flags states in ->atomic_check() so that they can be read
in ->atomic_enable().

Tested-by: Alexander Stein <alexander.stein@ew.tq-group.com>
Reviewed-by: Alexander Stein <alexander.stein@ew.tq-group.com>
Reviewed-by: Marek Vasut <marex@denx.de>
Signed-off-by: Liu Ying <victor.liu@nxp.com>
---
v5->v6:
* Add Marek's R-b tag.
* A slight change brought from the update in patch 2/6 to keep default
  MEDIA_BUS_FMT_RGB888_1X24 bus format.

v4->v5:
* Add Alexander's R-b and T-b tags.

v3->v4:
* Use 'new_{c,p}state' instead of 'new_{crtc,plane}_state'. (Alexander)
* Simplify lcdif_crtc_reset() by calling lcdif_crtc_atomic_destroy_state().
  (Alexander)
* Add '!crtc->state' check in lcdif_crtc_atomic_duplicate_state(). (Alexander)

v2->v3:
* No change.

v1->v2:
* Split from patch 2/2 in v1. (Marek, Alexander)
* Add comment on the 'base' member of lcdif_crtc_state structure to
  note it should always be the first member. (Lothar)

 drivers/gpu/drm/mxsfb/lcdif_kms.c | 140 ++++++++++++++++++++++--------
 1 file changed, 102 insertions(+), 38 deletions(-)

diff --git a/drivers/gpu/drm/mxsfb/lcdif_kms.c b/drivers/gpu/drm/mxsfb/lcdif_kms.c
index ba00a155d9b6..fab2253e4786 100644
--- a/drivers/gpu/drm/mxsfb/lcdif_kms.c
+++ b/drivers/gpu/drm/mxsfb/lcdif_kms.c
@@ -30,6 +30,18 @@
 #include "lcdif_drv.h"
 #include "lcdif_regs.h"
 
+struct lcdif_crtc_state {
+	struct drm_crtc_state	base;	/* always be the first member */
+	u32			bus_format;
+	u32			bus_flags;
+};
+
+static inline struct lcdif_crtc_state *
+to_lcdif_crtc_state(struct drm_crtc_state *s)
+{
+	return container_of(s, struct lcdif_crtc_state, base);
+}
+
 /* -----------------------------------------------------------------------------
  * CRTC
  */
@@ -385,48 +397,75 @@ static void lcdif_reset_block(struct lcdif_drm_private *lcdif)
 	readl(lcdif->base + LCDC_V8_CTRL);
 }
 
-static void lcdif_crtc_mode_set_nofb(struct lcdif_drm_private *lcdif,
-				     struct drm_plane_state *plane_state,
-				     struct drm_bridge_state *bridge_state,
-				     const u32 bus_format)
+static void lcdif_crtc_mode_set_nofb(struct drm_crtc_state *crtc_state,
+				     struct drm_plane_state *plane_state)
 {
-	struct drm_device *drm = lcdif->crtc.dev;
-	struct drm_display_mode *m = &lcdif->crtc.state->adjusted_mode;
-	u32 bus_flags = 0;
-
-	if (lcdif->bridge->timings)
-		bus_flags = lcdif->bridge->timings->input_bus_flags;
-	else if (bridge_state)
-		bus_flags = bridge_state->input_bus_cfg.flags;
+	struct lcdif_crtc_state *lcdif_crtc_state = to_lcdif_crtc_state(crtc_state);
+	struct drm_device *drm = crtc_state->crtc->dev;
+	struct lcdif_drm_private *lcdif = to_lcdif_drm_private(drm);
+	struct drm_display_mode *m = &crtc_state->adjusted_mode;
 
 	DRM_DEV_DEBUG_DRIVER(drm->dev, "Pixel clock: %dkHz (actual: %dkHz)\n",
 			     m->crtc_clock,
 			     (int)(clk_get_rate(lcdif->clk) / 1000));
 	DRM_DEV_DEBUG_DRIVER(drm->dev, "Bridge bus_flags: 0x%08X\n",
-			     bus_flags);
+			     lcdif_crtc_state->bus_flags);
 	DRM_DEV_DEBUG_DRIVER(drm->dev, "Mode flags: 0x%08X\n", m->flags);
 
 	/* Mandatory eLCDIF reset as per the Reference Manual */
 	lcdif_reset_block(lcdif);
 
-	lcdif_set_formats(lcdif, plane_state, bus_format);
+	lcdif_set_formats(lcdif, plane_state, lcdif_crtc_state->bus_format);
 
-	lcdif_set_mode(lcdif, bus_flags);
+	lcdif_set_mode(lcdif, lcdif_crtc_state->bus_flags);
 }
 
 static int lcdif_crtc_atomic_check(struct drm_crtc *crtc,
 				   struct drm_atomic_state *state)
 {
+	struct drm_device *drm = crtc->dev;
+	struct lcdif_drm_private *lcdif = to_lcdif_drm_private(drm);
 	struct drm_crtc_state *crtc_state = drm_atomic_get_new_crtc_state(state,
 									  crtc);
+	struct lcdif_crtc_state *lcdif_crtc_state = to_lcdif_crtc_state(crtc_state);
 	bool has_primary = crtc_state->plane_mask &
 			   drm_plane_mask(crtc->primary);
+	struct drm_bridge_state *bridge_state;
+	struct drm_bridge *bridge = lcdif->bridge;
+	int ret;
 
 	/* The primary plane has to be enabled when the CRTC is active. */
 	if (crtc_state->active && !has_primary)
 		return -EINVAL;
 
-	return drm_atomic_add_affected_planes(state, crtc);
+	ret = drm_atomic_add_affected_planes(state, crtc);
+	if (ret)
+		return ret;
+
+	bridge_state = drm_atomic_get_new_bridge_state(state, bridge);
+	if (!bridge_state)
+		lcdif_crtc_state->bus_format = MEDIA_BUS_FMT_FIXED;
+	else
+		lcdif_crtc_state->bus_format = bridge_state->input_bus_cfg.format;
+
+	if (lcdif_crtc_state->bus_format == MEDIA_BUS_FMT_FIXED) {
+		dev_warn_once(drm->dev,
+			      "Bridge does not provide bus format, assuming MEDIA_BUS_FMT_RGB888_1X24.\n"
+			      "Please fix bridge driver by handling atomic_get_input_bus_fmts.\n");
+		lcdif_crtc_state->bus_format = MEDIA_BUS_FMT_RGB888_1X24;
+	} else if (!lcdif_crtc_state->bus_format) {
+		/* If all else fails, default to RGB888_1X24 */
+		lcdif_crtc_state->bus_format = MEDIA_BUS_FMT_RGB888_1X24;
+	}
+
+	if (bridge->timings)
+		lcdif_crtc_state->bus_flags = bridge->timings->input_bus_flags;
+	else if (bridge_state)
+		lcdif_crtc_state->bus_flags = bridge_state->input_bus_cfg.flags;
+	else
+		lcdif_crtc_state->bus_flags = 0;
+
+	return 0;
 }
 
 static void lcdif_crtc_atomic_flush(struct drm_crtc *crtc,
@@ -458,35 +497,18 @@ static void lcdif_crtc_atomic_enable(struct drm_crtc *crtc,
 				     struct drm_atomic_state *state)
 {
 	struct lcdif_drm_private *lcdif = to_lcdif_drm_private(crtc->dev);
+	struct drm_crtc_state *new_cstate = drm_atomic_get_new_crtc_state(state, crtc);
 	struct drm_plane_state *new_pstate = drm_atomic_get_new_plane_state(state,
 									    crtc->primary);
 	struct drm_display_mode *m = &lcdif->crtc.state->adjusted_mode;
-	struct drm_bridge_state *bridge_state = NULL;
 	struct drm_device *drm = lcdif->drm;
-	u32 bus_format;
 	dma_addr_t paddr;
 
-	bridge_state = drm_atomic_get_new_bridge_state(state, lcdif->bridge);
-	if (!bridge_state)
-		bus_format = MEDIA_BUS_FMT_FIXED;
-	else
-		bus_format = bridge_state->input_bus_cfg.format;
-
-	if (bus_format == MEDIA_BUS_FMT_FIXED) {
-		dev_warn_once(drm->dev,
-			      "Bridge does not provide bus format, assuming MEDIA_BUS_FMT_RGB888_1X24.\n"
-			      "Please fix bridge driver by handling atomic_get_input_bus_fmts.\n");
-		bus_format = MEDIA_BUS_FMT_RGB888_1X24;
-	} else if (!bus_format) {
-		/* If all else fails, default to RGB888_1X24 */
-		bus_format = MEDIA_BUS_FMT_RGB888_1X24;
-	}
-
 	clk_set_rate(lcdif->clk, m->crtc_clock * 1000);
 
 	pm_runtime_get_sync(drm->dev);
 
-	lcdif_crtc_mode_set_nofb(lcdif, new_pstate, bridge_state, bus_format);
+	lcdif_crtc_mode_set_nofb(new_cstate, new_pstate);
 
 	/* Write cur_buf as well to avoid an initial corrupt frame */
 	paddr = drm_fb_dma_get_gem_addr(new_pstate->fb, new_pstate, 0);
@@ -523,6 +545,48 @@ static void lcdif_crtc_atomic_disable(struct drm_crtc *crtc,
 	pm_runtime_put_sync(drm->dev);
 }
 
+static void lcdif_crtc_atomic_destroy_state(struct drm_crtc *crtc,
+					    struct drm_crtc_state *state)
+{
+	__drm_atomic_helper_crtc_destroy_state(state);
+	kfree(to_lcdif_crtc_state(state));
+}
+
+static void lcdif_crtc_reset(struct drm_crtc *crtc)
+{
+	struct lcdif_crtc_state *state;
+
+	if (crtc->state)
+		lcdif_crtc_atomic_destroy_state(crtc, crtc->state);
+
+	crtc->state = NULL;
+
+	state = kzalloc(sizeof(*state), GFP_KERNEL);
+	if (state)
+		__drm_atomic_helper_crtc_reset(crtc, &state->base);
+}
+
+static struct drm_crtc_state *
+lcdif_crtc_atomic_duplicate_state(struct drm_crtc *crtc)
+{
+	struct lcdif_crtc_state *old = to_lcdif_crtc_state(crtc->state);
+	struct lcdif_crtc_state *new;
+
+	if (WARN_ON(!crtc->state))
+		return NULL;
+
+	new = kzalloc(sizeof(*new), GFP_KERNEL);
+	if (!new)
+		return NULL;
+
+	__drm_atomic_helper_crtc_duplicate_state(crtc, &new->base);
+
+	new->bus_format = old->bus_format;
+	new->bus_flags = old->bus_flags;
+
+	return &new->base;
+}
+
 static int lcdif_crtc_enable_vblank(struct drm_crtc *crtc)
 {
 	struct lcdif_drm_private *lcdif = to_lcdif_drm_private(crtc->dev);
@@ -551,12 +615,12 @@ static const struct drm_crtc_helper_funcs lcdif_crtc_helper_funcs = {
 };
 
 static const struct drm_crtc_funcs lcdif_crtc_funcs = {
-	.reset = drm_atomic_helper_crtc_reset,
+	.reset = lcdif_crtc_reset,
 	.destroy = drm_crtc_cleanup,
 	.set_config = drm_atomic_helper_set_config,
 	.page_flip = drm_atomic_helper_page_flip,
-	.atomic_duplicate_state = drm_atomic_helper_crtc_duplicate_state,
-	.atomic_destroy_state = drm_atomic_helper_crtc_destroy_state,
+	.atomic_duplicate_state = lcdif_crtc_atomic_duplicate_state,
+	.atomic_destroy_state = lcdif_crtc_atomic_destroy_state,
 	.enable_vblank = lcdif_crtc_enable_vblank,
 	.disable_vblank = lcdif_crtc_disable_vblank,
 };
-- 
2.37.1

[PATCH v6 4/6] drm: lcdif: Check consistent bus format and flags across first bridges

[Liu Ying]

The single LCDIF embedded in i.MX93 SoC may drive multiple displays
simultaneously.  Check bus format and flags across first bridges in
->atomic_check() to ensure they are consistent.  This is a preparation
for adding i.MX93 LCDIF support.

Acked-by: Alexander Stein <alexander.stein@ew.tq-group.com>
Tested-by: Alexander Stein <alexander.stein@ew.tq-group.com>
Reviewed-by: Marek Vasut <marex@denx.de>
Signed-off-by: Liu Ying <victor.liu@nxp.com>
---
v5->v6:
* Add Marek's R-b.
* A slight change brought from the update in patch 2/6 to keep default
  MEDIA_BUS_FMT_RGB888_1X24 bus format.

v4->v5:
* Add Alexander's A-b and T-b tags.

v3->v4:
* No change.

v2->v3:
* No change.

v1->v2:
* Split from patch 2/2 in v1. (Marek, Alexander)
* Drop a comment about bridge input bus format from lcdif_crtc_atomic_check().

 drivers/gpu/drm/mxsfb/lcdif_drv.c |  2 -
 drivers/gpu/drm/mxsfb/lcdif_drv.h |  1 -
 drivers/gpu/drm/mxsfb/lcdif_kms.c | 82 ++++++++++++++++++++++---------
 3 files changed, 58 insertions(+), 27 deletions(-)

diff --git a/drivers/gpu/drm/mxsfb/lcdif_drv.c b/drivers/gpu/drm/mxsfb/lcdif_drv.c
index 6fb5b469ee5a..e816f87828fb 100644
--- a/drivers/gpu/drm/mxsfb/lcdif_drv.c
+++ b/drivers/gpu/drm/mxsfb/lcdif_drv.c
@@ -52,8 +52,6 @@ static int lcdif_attach_bridge(struct lcdif_drm_private *lcdif)
 	if (ret)
 		return dev_err_probe(drm->dev, ret, "Failed to attach bridge\n");
 
-	lcdif->bridge = bridge;
-
 	return 0;
 }
 
diff --git a/drivers/gpu/drm/mxsfb/lcdif_drv.h b/drivers/gpu/drm/mxsfb/lcdif_drv.h
index 6cdba6e20c02..aa6d099a1897 100644
--- a/drivers/gpu/drm/mxsfb/lcdif_drv.h
+++ b/drivers/gpu/drm/mxsfb/lcdif_drv.h
@@ -31,7 +31,6 @@ struct lcdif_drm_private {
 	} planes;
 	struct drm_crtc			crtc;
 	struct drm_encoder		encoder;
-	struct drm_bridge		*bridge;
 };
 
 static inline struct lcdif_drm_private *
diff --git a/drivers/gpu/drm/mxsfb/lcdif_kms.c b/drivers/gpu/drm/mxsfb/lcdif_kms.c
index fab2253e4786..e13382beb53e 100644
--- a/drivers/gpu/drm/mxsfb/lcdif_kms.c
+++ b/drivers/gpu/drm/mxsfb/lcdif_kms.c
@@ -17,6 +17,7 @@
 #include <drm/drm_atomic_helper.h>
 #include <drm/drm_bridge.h>
 #include <drm/drm_color_mgmt.h>
+#include <drm/drm_connector.h>
 #include <drm/drm_crtc.h>
 #include <drm/drm_encoder.h>
 #include <drm/drm_fb_dma_helper.h>
@@ -424,15 +425,19 @@ static int lcdif_crtc_atomic_check(struct drm_crtc *crtc,
 				   struct drm_atomic_state *state)
 {
 	struct drm_device *drm = crtc->dev;
-	struct lcdif_drm_private *lcdif = to_lcdif_drm_private(drm);
 	struct drm_crtc_state *crtc_state = drm_atomic_get_new_crtc_state(state,
 									  crtc);
 	struct lcdif_crtc_state *lcdif_crtc_state = to_lcdif_crtc_state(crtc_state);
 	bool has_primary = crtc_state->plane_mask &
 			   drm_plane_mask(crtc->primary);
+	struct drm_connector_state *connector_state;
+	struct drm_connector *connector;
+	struct drm_encoder *encoder;
 	struct drm_bridge_state *bridge_state;
-	struct drm_bridge *bridge = lcdif->bridge;
-	int ret;
+	struct drm_bridge *bridge;
+	u32 bus_format, bus_flags;
+	bool format_set = false, flags_set = false;
+	int ret, i;
 
 	/* The primary plane has to be enabled when the CRTC is active. */
 	if (crtc_state->active && !has_primary)
@@ -442,29 +447,58 @@ static int lcdif_crtc_atomic_check(struct drm_crtc *crtc,
 	if (ret)
 		return ret;
 
-	bridge_state = drm_atomic_get_new_bridge_state(state, bridge);
-	if (!bridge_state)
-		lcdif_crtc_state->bus_format = MEDIA_BUS_FMT_FIXED;
-	else
-		lcdif_crtc_state->bus_format = bridge_state->input_bus_cfg.format;
-
-	if (lcdif_crtc_state->bus_format == MEDIA_BUS_FMT_FIXED) {
-		dev_warn_once(drm->dev,
-			      "Bridge does not provide bus format, assuming MEDIA_BUS_FMT_RGB888_1X24.\n"
-			      "Please fix bridge driver by handling atomic_get_input_bus_fmts.\n");
-		lcdif_crtc_state->bus_format = MEDIA_BUS_FMT_RGB888_1X24;
-	} else if (!lcdif_crtc_state->bus_format) {
-		/* If all else fails, default to RGB888_1X24 */
-		lcdif_crtc_state->bus_format = MEDIA_BUS_FMT_RGB888_1X24;
+	/* Try to find consistent bus format and flags across first bridges. */
+	for_each_new_connector_in_state(state, connector, connector_state, i) {
+		if (!connector_state->crtc)
+			continue;
+
+		encoder = connector_state->best_encoder;
+
+		bridge = drm_bridge_chain_get_first_bridge(encoder);
+		if (!bridge)
+			continue;
+
+		bridge_state = drm_atomic_get_new_bridge_state(state, bridge);
+		if (!bridge_state)
+			bus_format = MEDIA_BUS_FMT_FIXED;
+		else
+			bus_format = bridge_state->input_bus_cfg.format;
+
+		if (bus_format == MEDIA_BUS_FMT_FIXED) {
+			dev_warn(drm->dev,
+				 "[ENCODER:%d:%s]'s bridge does not provide bus format, assuming MEDIA_BUS_FMT_RGB888_1X24.\n"
+				 "Please fix bridge driver by handling atomic_get_input_bus_fmts.\n",
+				 encoder->base.id, encoder->name);
+			bus_format = MEDIA_BUS_FMT_RGB888_1X24;
+		} else if (!bus_format) {
+			/* If all else fails, default to RGB888_1X24 */
+			bus_format = MEDIA_BUS_FMT_RGB888_1X24;
+		}
+
+		if (!format_set) {
+			lcdif_crtc_state->bus_format = bus_format;
+			format_set = true;
+		} else if (lcdif_crtc_state->bus_format != bus_format) {
+			DRM_DEV_DEBUG_DRIVER(drm->dev, "inconsistent bus format\n");
+			return -EINVAL;
+		}
+
+		if (bridge->timings)
+			bus_flags = bridge->timings->input_bus_flags;
+		else if (bridge_state)
+			bus_flags = bridge_state->input_bus_cfg.flags;
+		else
+			bus_flags = 0;
+
+		if (!flags_set) {
+			lcdif_crtc_state->bus_flags = bus_flags;
+			flags_set = true;
+		} else if (lcdif_crtc_state->bus_flags != bus_flags) {
+			DRM_DEV_DEBUG_DRIVER(drm->dev, "inconsistent bus flags\n");
+			return -EINVAL;
+		}
 	}
 
-	if (bridge->timings)
-		lcdif_crtc_state->bus_flags = bridge->timings->input_bus_flags;
-	else if (bridge_state)
-		lcdif_crtc_state->bus_flags = bridge_state->input_bus_cfg.flags;
-	else
-		lcdif_crtc_state->bus_flags = 0;
-
 	return 0;
 }
 
-- 
2.37.1

[PATCH v6 4/6] drm: lcdif: Check consistent bus format and flags across first bridges

[Liu Ying]

The single LCDIF embedded in i.MX93 SoC may drive multiple displays
simultaneously.  Check bus format and flags across first bridges in
->atomic_check() to ensure they are consistent.  This is a preparation
for adding i.MX93 LCDIF support.

Acked-by: Alexander Stein <alexander.stein@ew.tq-group.com>
Tested-by: Alexander Stein <alexander.stein@ew.tq-group.com>
Reviewed-by: Marek Vasut <marex@denx.de>
Signed-off-by: Liu Ying <victor.liu@nxp.com>
---
v5->v6:
* Add Marek's R-b.
* A slight change brought from the update in patch 2/6 to keep default
  MEDIA_BUS_FMT_RGB888_1X24 bus format.

v4->v5:
* Add Alexander's A-b and T-b tags.

v3->v4:
* No change.

v2->v3:
* No change.

v1->v2:
* Split from patch 2/2 in v1. (Marek, Alexander)
* Drop a comment about bridge input bus format from lcdif_crtc_atomic_check().

 drivers/gpu/drm/mxsfb/lcdif_drv.c |  2 -
 drivers/gpu/drm/mxsfb/lcdif_drv.h |  1 -
 drivers/gpu/drm/mxsfb/lcdif_kms.c | 82 ++++++++++++++++++++++---------
 3 files changed, 58 insertions(+), 27 deletions(-)

diff --git a/drivers/gpu/drm/mxsfb/lcdif_drv.c b/drivers/gpu/drm/mxsfb/lcdif_drv.c
index 6fb5b469ee5a..e816f87828fb 100644
--- a/drivers/gpu/drm/mxsfb/lcdif_drv.c
+++ b/drivers/gpu/drm/mxsfb/lcdif_drv.c
@@ -52,8 +52,6 @@ static int lcdif_attach_bridge(struct lcdif_drm_private *lcdif)
 	if (ret)
 		return dev_err_probe(drm->dev, ret, "Failed to attach bridge\n");
 
-	lcdif->bridge = bridge;
-
 	return 0;
 }
 
diff --git a/drivers/gpu/drm/mxsfb/lcdif_drv.h b/drivers/gpu/drm/mxsfb/lcdif_drv.h
index 6cdba6e20c02..aa6d099a1897 100644
--- a/drivers/gpu/drm/mxsfb/lcdif_drv.h
+++ b/drivers/gpu/drm/mxsfb/lcdif_drv.h
@@ -31,7 +31,6 @@ struct lcdif_drm_private {
 	} planes;
 	struct drm_crtc			crtc;
 	struct drm_encoder		encoder;
-	struct drm_bridge		*bridge;
 };
 
 static inline struct lcdif_drm_private *
diff --git a/drivers/gpu/drm/mxsfb/lcdif_kms.c b/drivers/gpu/drm/mxsfb/lcdif_kms.c
index fab2253e4786..e13382beb53e 100644
--- a/drivers/gpu/drm/mxsfb/lcdif_kms.c
+++ b/drivers/gpu/drm/mxsfb/lcdif_kms.c
@@ -17,6 +17,7 @@
 #include <drm/drm_atomic_helper.h>
 #include <drm/drm_bridge.h>
 #include <drm/drm_color_mgmt.h>
+#include <drm/drm_connector.h>
 #include <drm/drm_crtc.h>
 #include <drm/drm_encoder.h>
 #include <drm/drm_fb_dma_helper.h>
@@ -424,15 +425,19 @@ static int lcdif_crtc_atomic_check(struct drm_crtc *crtc,
 				   struct drm_atomic_state *state)
 {
 	struct drm_device *drm = crtc->dev;
-	struct lcdif_drm_private *lcdif = to_lcdif_drm_private(drm);
 	struct drm_crtc_state *crtc_state = drm_atomic_get_new_crtc_state(state,
 									  crtc);
 	struct lcdif_crtc_state *lcdif_crtc_state = to_lcdif_crtc_state(crtc_state);
 	bool has_primary = crtc_state->plane_mask &
 			   drm_plane_mask(crtc->primary);
+	struct drm_connector_state *connector_state;
+	struct drm_connector *connector;
+	struct drm_encoder *encoder;
 	struct drm_bridge_state *bridge_state;
-	struct drm_bridge *bridge = lcdif->bridge;
-	int ret;
+	struct drm_bridge *bridge;
+	u32 bus_format, bus_flags;
+	bool format_set = false, flags_set = false;
+	int ret, i;
 
 	/* The primary plane has to be enabled when the CRTC is active. */
 	if (crtc_state->active && !has_primary)
@@ -442,29 +447,58 @@ static int lcdif_crtc_atomic_check(struct drm_crtc *crtc,
 	if (ret)
 		return ret;
 
-	bridge_state = drm_atomic_get_new_bridge_state(state, bridge);
-	if (!bridge_state)
-		lcdif_crtc_state->bus_format = MEDIA_BUS_FMT_FIXED;
-	else
-		lcdif_crtc_state->bus_format = bridge_state->input_bus_cfg.format;
-
-	if (lcdif_crtc_state->bus_format == MEDIA_BUS_FMT_FIXED) {
-		dev_warn_once(drm->dev,
-			      "Bridge does not provide bus format, assuming MEDIA_BUS_FMT_RGB888_1X24.\n"
-			      "Please fix bridge driver by handling atomic_get_input_bus_fmts.\n");
-		lcdif_crtc_state->bus_format = MEDIA_BUS_FMT_RGB888_1X24;
-	} else if (!lcdif_crtc_state->bus_format) {
-		/* If all else fails, default to RGB888_1X24 */
-		lcdif_crtc_state->bus_format = MEDIA_BUS_FMT_RGB888_1X24;
+	/* Try to find consistent bus format and flags across first bridges. */
+	for_each_new_connector_in_state(state, connector, connector_state, i) {
+		if (!connector_state->crtc)
+			continue;
+
+		encoder = connector_state->best_encoder;
+
+		bridge = drm_bridge_chain_get_first_bridge(encoder);
+		if (!bridge)
+			continue;
+
+		bridge_state = drm_atomic_get_new_bridge_state(state, bridge);
+		if (!bridge_state)
+			bus_format = MEDIA_BUS_FMT_FIXED;
+		else
+			bus_format = bridge_state->input_bus_cfg.format;
+
+		if (bus_format == MEDIA_BUS_FMT_FIXED) {
+			dev_warn(drm->dev,
+				 "[ENCODER:%d:%s]'s bridge does not provide bus format, assuming MEDIA_BUS_FMT_RGB888_1X24.\n"
+				 "Please fix bridge driver by handling atomic_get_input_bus_fmts.\n",
+				 encoder->base.id, encoder->name);
+			bus_format = MEDIA_BUS_FMT_RGB888_1X24;
+		} else if (!bus_format) {
+			/* If all else fails, default to RGB888_1X24 */
+			bus_format = MEDIA_BUS_FMT_RGB888_1X24;
+		}
+
+		if (!format_set) {
+			lcdif_crtc_state->bus_format = bus_format;
+			format_set = true;
+		} else if (lcdif_crtc_state->bus_format != bus_format) {
+			DRM_DEV_DEBUG_DRIVER(drm->dev, "inconsistent bus format\n");
+			return -EINVAL;
+		}
+
+		if (bridge->timings)
+			bus_flags = bridge->timings->input_bus_flags;
+		else if (bridge_state)
+			bus_flags = bridge_state->input_bus_cfg.flags;
+		else
+			bus_flags = 0;
+
+		if (!flags_set) {
+			lcdif_crtc_state->bus_flags = bus_flags;
+			flags_set = true;
+		} else if (lcdif_crtc_state->bus_flags != bus_flags) {
+			DRM_DEV_DEBUG_DRIVER(drm->dev, "inconsistent bus flags\n");
+			return -EINVAL;
+		}
 	}
 
-	if (bridge->timings)
-		lcdif_crtc_state->bus_flags = bridge->timings->input_bus_flags;
-	else if (bridge_state)
-		lcdif_crtc_state->bus_flags = bridge_state->input_bus_cfg.flags;
-	else
-		lcdif_crtc_state->bus_flags = 0;
-
 	return 0;
 }
 
-- 
2.37.1

[PATCH v6 5/6] drm: lcdif: Add multiple encoders and first bridges support

[Liu Ying]

The single LCDIF embedded in i.MX93 SoC may drive multiple displays
simultaneously.  Look at LCDIF output port's remote port parents to
find all enabled first bridges.  Add an encoder for each found bridge
and attach the bridge to the encoder.  This is a preparation for
adding i.MX93 LCDIF support.

Tested-by: Alexander Stein <alexander.stein@ew.tq-group.com>
Acked-by: Alexander Stein <alexander.stein@ew.tq-group.com>
Signed-off-by: Liu Ying <victor.liu@nxp.com>
---
v5->v6:
* Drop MAX_DISPLAYS macro. (Marek)
* Drop the encoder member in struct lcdif_drm_private.
* Drop endpoint id check.
* Allocate encoders by calling devm_kzalloc().

v4->v5:
* Rebase upon v6.4-rc1 and resolve a trivial conflict.
* Add Alexander's A-b and T-b tags.

v3->v4:
* Improve warning message when ignoring invalid LCDIF OF endpoint ids.
  (Alexander)

v2->v3:
* No change.

v1->v2:
* Split from patch 2/2 in v1. (Marek, Alexander)
* Drop '!remote ||' from lcdif_attach_bridge(). (Lothar)
* Drop unneeded 'bridges' member from lcdif_drm_private structure.

 drivers/gpu/drm/mxsfb/lcdif_drv.c | 70 +++++++++++++++++++++++++++----
 drivers/gpu/drm/mxsfb/lcdif_drv.h |  2 -
 drivers/gpu/drm/mxsfb/lcdif_kms.c | 21 ++--------
 3 files changed, 65 insertions(+), 28 deletions(-)

diff --git a/drivers/gpu/drm/mxsfb/lcdif_drv.c b/drivers/gpu/drm/mxsfb/lcdif_drv.c
index e816f87828fb..dc85498b81cd 100644
--- a/drivers/gpu/drm/mxsfb/lcdif_drv.c
+++ b/drivers/gpu/drm/mxsfb/lcdif_drv.c
@@ -9,13 +9,16 @@
 #include <linux/dma-mapping.h>
 #include <linux/io.h>
 #include <linux/module.h>
+#include <linux/of.h>
 #include <linux/of_device.h>
+#include <linux/of_graph.h>
 #include <linux/platform_device.h>
 #include <linux/pm_runtime.h>
 
 #include <drm/drm_atomic_helper.h>
 #include <drm/drm_bridge.h>
 #include <drm/drm_drv.h>
+#include <drm/drm_encoder.h>
 #include <drm/drm_fbdev_dma.h>
 #include <drm/drm_gem_dma_helper.h>
 #include <drm/drm_gem_framebuffer_helper.h>
@@ -38,19 +41,70 @@ static const struct drm_mode_config_helper_funcs lcdif_mode_config_helpers = {
 	.atomic_commit_tail = drm_atomic_helper_commit_tail_rpm,
 };
 
+static const struct drm_encoder_funcs lcdif_encoder_funcs = {
+	.destroy = drm_encoder_cleanup,
+};
+
 static int lcdif_attach_bridge(struct lcdif_drm_private *lcdif)
 {
-	struct drm_device *drm = lcdif->drm;
+	struct device *dev = lcdif->drm->dev;
+	struct device_node *ep;
 	struct drm_bridge *bridge;
 	int ret;
 
-	bridge = devm_drm_of_get_bridge(drm->dev, drm->dev->of_node, 0, 0);
-	if (IS_ERR(bridge))
-		return PTR_ERR(bridge);
-
-	ret = drm_bridge_attach(&lcdif->encoder, bridge, NULL, 0);
-	if (ret)
-		return dev_err_probe(drm->dev, ret, "Failed to attach bridge\n");
+	for_each_endpoint_of_node(dev->of_node, ep) {
+		struct device_node *remote;
+		struct of_endpoint of_ep;
+		struct drm_encoder *encoder;
+
+		remote = of_graph_get_remote_port_parent(ep);
+		if (!of_device_is_available(remote)) {
+			of_node_put(remote);
+			continue;
+		}
+		of_node_put(remote);
+
+		ret = of_graph_parse_endpoint(ep, &of_ep);
+		if (ret < 0) {
+			dev_err(dev, "Failed to parse endpoint %pOF\n", ep);
+			of_node_put(ep);
+			return ret;
+		}
+
+		bridge = devm_drm_of_get_bridge(dev, dev->of_node, 0, of_ep.id);
+		if (IS_ERR(bridge)) {
+			of_node_put(ep);
+			return dev_err_probe(dev, PTR_ERR(bridge),
+					     "Failed to get bridge for endpoint%u\n",
+					     of_ep.id);
+		}
+
+		encoder = devm_kzalloc(dev, sizeof(*encoder), GFP_KERNEL);
+		if (!encoder) {
+			dev_err(dev, "Failed to allocate encoder for endpoint%u\n",
+				of_ep.id);
+			of_node_put(ep);
+			return -ENOMEM;
+		}
+
+		encoder->possible_crtcs = drm_crtc_mask(&lcdif->crtc);
+		ret = drm_encoder_init(lcdif->drm, encoder, &lcdif_encoder_funcs,
+				       DRM_MODE_ENCODER_NONE, NULL);
+		if (ret) {
+			dev_err(dev, "Failed to initialize encoder for endpoint%u: %d\n",
+				of_ep.id, ret);
+			of_node_put(ep);
+			return ret;
+		}
+
+		ret = drm_bridge_attach(encoder, bridge, NULL, 0);
+		if (ret) {
+			of_node_put(ep);
+			return dev_err_probe(dev, ret,
+					     "Failed to attach bridge for endpoint%u\n",
+					     of_ep.id);
+		}
+	}
 
 	return 0;
 }
diff --git a/drivers/gpu/drm/mxsfb/lcdif_drv.h b/drivers/gpu/drm/mxsfb/lcdif_drv.h
index aa6d099a1897..61483a4e058d 100644
--- a/drivers/gpu/drm/mxsfb/lcdif_drv.h
+++ b/drivers/gpu/drm/mxsfb/lcdif_drv.h
@@ -11,7 +11,6 @@
 #include <drm/drm_bridge.h>
 #include <drm/drm_crtc.h>
 #include <drm/drm_device.h>
-#include <drm/drm_encoder.h>
 #include <drm/drm_plane.h>
 
 struct clk;
@@ -30,7 +29,6 @@ struct lcdif_drm_private {
 		/* i.MXRT does support overlay planes, add them here. */
 	} planes;
 	struct drm_crtc			crtc;
-	struct drm_encoder		encoder;
 };
 
 static inline struct lcdif_drm_private *
diff --git a/drivers/gpu/drm/mxsfb/lcdif_kms.c b/drivers/gpu/drm/mxsfb/lcdif_kms.c
index e13382beb53e..2541d2de4e45 100644
--- a/drivers/gpu/drm/mxsfb/lcdif_kms.c
+++ b/drivers/gpu/drm/mxsfb/lcdif_kms.c
@@ -659,14 +659,6 @@ static const struct drm_crtc_funcs lcdif_crtc_funcs = {
 	.disable_vblank = lcdif_crtc_disable_vblank,
 };
 
-/* -----------------------------------------------------------------------------
- * Encoder
- */
-
-static const struct drm_encoder_funcs lcdif_encoder_funcs = {
-	.destroy = drm_encoder_cleanup,
-};
-
 /* -----------------------------------------------------------------------------
  * Planes
  */
@@ -759,7 +751,6 @@ int lcdif_kms_init(struct lcdif_drm_private *lcdif)
 					BIT(DRM_COLOR_YCBCR_BT2020);
 	const u32 supported_ranges = BIT(DRM_COLOR_YCBCR_LIMITED_RANGE) |
 				     BIT(DRM_COLOR_YCBCR_FULL_RANGE);
-	struct drm_encoder *encoder = &lcdif->encoder;
 	struct drm_crtc *crtc = &lcdif->crtc;
 	int ret;
 
@@ -783,13 +774,7 @@ int lcdif_kms_init(struct lcdif_drm_private *lcdif)
 		return ret;
 
 	drm_crtc_helper_add(crtc, &lcdif_crtc_helper_funcs);
-	ret = drm_crtc_init_with_planes(lcdif->drm, crtc,
-					&lcdif->planes.primary, NULL,
-					&lcdif_crtc_funcs, NULL);
-	if (ret)
-		return ret;
-
-	encoder->possible_crtcs = drm_crtc_mask(crtc);
-	return drm_encoder_init(lcdif->drm, encoder, &lcdif_encoder_funcs,
-				DRM_MODE_ENCODER_NONE, NULL);
+	return drm_crtc_init_with_planes(lcdif->drm, crtc,
+					 &lcdif->planes.primary, NULL,
+					 &lcdif_crtc_funcs, NULL);
 }
-- 
2.37.1

[PATCH v6 5/6] drm: lcdif: Add multiple encoders and first bridges support

[Liu Ying]

The single LCDIF embedded in i.MX93 SoC may drive multiple displays
simultaneously.  Look at LCDIF output port's remote port parents to
find all enabled first bridges.  Add an encoder for each found bridge
and attach the bridge to the encoder.  This is a preparation for
adding i.MX93 LCDIF support.

Tested-by: Alexander Stein <alexander.stein@ew.tq-group.com>
Acked-by: Alexander Stein <alexander.stein@ew.tq-group.com>
Signed-off-by: Liu Ying <victor.liu@nxp.com>
---
v5->v6:
* Drop MAX_DISPLAYS macro. (Marek)
* Drop the encoder member in struct lcdif_drm_private.
* Drop endpoint id check.
* Allocate encoders by calling devm_kzalloc().

v4->v5:
* Rebase upon v6.4-rc1 and resolve a trivial conflict.
* Add Alexander's A-b and T-b tags.

v3->v4:
* Improve warning message when ignoring invalid LCDIF OF endpoint ids.
  (Alexander)

v2->v3:
* No change.

v1->v2:
* Split from patch 2/2 in v1. (Marek, Alexander)
* Drop '!remote ||' from lcdif_attach_bridge(). (Lothar)
* Drop unneeded 'bridges' member from lcdif_drm_private structure.

 drivers/gpu/drm/mxsfb/lcdif_drv.c | 70 +++++++++++++++++++++++++++----
 drivers/gpu/drm/mxsfb/lcdif_drv.h |  2 -
 drivers/gpu/drm/mxsfb/lcdif_kms.c | 21 ++--------
 3 files changed, 65 insertions(+), 28 deletions(-)

diff --git a/drivers/gpu/drm/mxsfb/lcdif_drv.c b/drivers/gpu/drm/mxsfb/lcdif_drv.c
index e816f87828fb..dc85498b81cd 100644
--- a/drivers/gpu/drm/mxsfb/lcdif_drv.c
+++ b/drivers/gpu/drm/mxsfb/lcdif_drv.c
@@ -9,13 +9,16 @@
 #include <linux/dma-mapping.h>
 #include <linux/io.h>
 #include <linux/module.h>
+#include <linux/of.h>
 #include <linux/of_device.h>
+#include <linux/of_graph.h>
 #include <linux/platform_device.h>
 #include <linux/pm_runtime.h>
 
 #include <drm/drm_atomic_helper.h>
 #include <drm/drm_bridge.h>
 #include <drm/drm_drv.h>
+#include <drm/drm_encoder.h>
 #include <drm/drm_fbdev_dma.h>
 #include <drm/drm_gem_dma_helper.h>
 #include <drm/drm_gem_framebuffer_helper.h>
@@ -38,19 +41,70 @@ static const struct drm_mode_config_helper_funcs lcdif_mode_config_helpers = {
 	.atomic_commit_tail = drm_atomic_helper_commit_tail_rpm,
 };
 
+static const struct drm_encoder_funcs lcdif_encoder_funcs = {
+	.destroy = drm_encoder_cleanup,
+};
+
 static int lcdif_attach_bridge(struct lcdif_drm_private *lcdif)
 {
-	struct drm_device *drm = lcdif->drm;
+	struct device *dev = lcdif->drm->dev;
+	struct device_node *ep;
 	struct drm_bridge *bridge;
 	int ret;
 
-	bridge = devm_drm_of_get_bridge(drm->dev, drm->dev->of_node, 0, 0);
-	if (IS_ERR(bridge))
-		return PTR_ERR(bridge);
-
-	ret = drm_bridge_attach(&lcdif->encoder, bridge, NULL, 0);
-	if (ret)
-		return dev_err_probe(drm->dev, ret, "Failed to attach bridge\n");
+	for_each_endpoint_of_node(dev->of_node, ep) {
+		struct device_node *remote;
+		struct of_endpoint of_ep;
+		struct drm_encoder *encoder;
+
+		remote = of_graph_get_remote_port_parent(ep);
+		if (!of_device_is_available(remote)) {
+			of_node_put(remote);
+			continue;
+		}
+		of_node_put(remote);
+
+		ret = of_graph_parse_endpoint(ep, &of_ep);
+		if (ret < 0) {
+			dev_err(dev, "Failed to parse endpoint %pOF\n", ep);
+			of_node_put(ep);
+			return ret;
+		}
+
+		bridge = devm_drm_of_get_bridge(dev, dev->of_node, 0, of_ep.id);
+		if (IS_ERR(bridge)) {
+			of_node_put(ep);
+			return dev_err_probe(dev, PTR_ERR(bridge),
+					     "Failed to get bridge for endpoint%u\n",
+					     of_ep.id);
+		}
+
+		encoder = devm_kzalloc(dev, sizeof(*encoder), GFP_KERNEL);
+		if (!encoder) {
+			dev_err(dev, "Failed to allocate encoder for endpoint%u\n",
+				of_ep.id);
+			of_node_put(ep);
+			return -ENOMEM;
+		}
+
+		encoder->possible_crtcs = drm_crtc_mask(&lcdif->crtc);
+		ret = drm_encoder_init(lcdif->drm, encoder, &lcdif_encoder_funcs,
+				       DRM_MODE_ENCODER_NONE, NULL);
+		if (ret) {
+			dev_err(dev, "Failed to initialize encoder for endpoint%u: %d\n",
+				of_ep.id, ret);
+			of_node_put(ep);
+			return ret;
+		}
+
+		ret = drm_bridge_attach(encoder, bridge, NULL, 0);
+		if (ret) {
+			of_node_put(ep);
+			return dev_err_probe(dev, ret,
+					     "Failed to attach bridge for endpoint%u\n",
+					     of_ep.id);
+		}
+	}
 
 	return 0;
 }
diff --git a/drivers/gpu/drm/mxsfb/lcdif_drv.h b/drivers/gpu/drm/mxsfb/lcdif_drv.h
index aa6d099a1897..61483a4e058d 100644
--- a/drivers/gpu/drm/mxsfb/lcdif_drv.h
+++ b/drivers/gpu/drm/mxsfb/lcdif_drv.h
@@ -11,7 +11,6 @@
 #include <drm/drm_bridge.h>
 #include <drm/drm_crtc.h>
 #include <drm/drm_device.h>
-#include <drm/drm_encoder.h>
 #include <drm/drm_plane.h>
 
 struct clk;
@@ -30,7 +29,6 @@ struct lcdif_drm_private {
 		/* i.MXRT does support overlay planes, add them here. */
 	} planes;
 	struct drm_crtc			crtc;
-	struct drm_encoder		encoder;
 };
 
 static inline struct lcdif_drm_private *
diff --git a/drivers/gpu/drm/mxsfb/lcdif_kms.c b/drivers/gpu/drm/mxsfb/lcdif_kms.c
index e13382beb53e..2541d2de4e45 100644
--- a/drivers/gpu/drm/mxsfb/lcdif_kms.c
+++ b/drivers/gpu/drm/mxsfb/lcdif_kms.c
@@ -659,14 +659,6 @@ static const struct drm_crtc_funcs lcdif_crtc_funcs = {
 	.disable_vblank = lcdif_crtc_disable_vblank,
 };
 
-/* -----------------------------------------------------------------------------
- * Encoder
- */
-
-static const struct drm_encoder_funcs lcdif_encoder_funcs = {
-	.destroy = drm_encoder_cleanup,
-};
-
 /* -----------------------------------------------------------------------------
  * Planes
  */
@@ -759,7 +751,6 @@ int lcdif_kms_init(struct lcdif_drm_private *lcdif)
 					BIT(DRM_COLOR_YCBCR_BT2020);
 	const u32 supported_ranges = BIT(DRM_COLOR_YCBCR_LIMITED_RANGE) |
 				     BIT(DRM_COLOR_YCBCR_FULL_RANGE);
-	struct drm_encoder *encoder = &lcdif->encoder;
 	struct drm_crtc *crtc = &lcdif->crtc;
 	int ret;
 
@@ -783,13 +774,7 @@ int lcdif_kms_init(struct lcdif_drm_private *lcdif)
 		return ret;
 
 	drm_crtc_helper_add(crtc, &lcdif_crtc_helper_funcs);
-	ret = drm_crtc_init_with_planes(lcdif->drm, crtc,
-					&lcdif->planes.primary, NULL,
-					&lcdif_crtc_funcs, NULL);
-	if (ret)
-		return ret;
-
-	encoder->possible_crtcs = drm_crtc_mask(crtc);
-	return drm_encoder_init(lcdif->drm, encoder, &lcdif_encoder_funcs,
-				DRM_MODE_ENCODER_NONE, NULL);
+	return drm_crtc_init_with_planes(lcdif->drm, crtc,
+					 &lcdif->planes.primary, NULL,
+					 &lcdif_crtc_funcs, NULL);
 }
-- 
2.37.1

[PATCH v6 6/6] drm: lcdif: Add i.MX93 LCDIF compatible string

[Liu Ying]

With all previous preparations done to make it possible for the
single LCDIF embedded in i.MX93 SoC to drive multiple displays
simultaneously, add i.MX93 LCDIF compatible string as the last
step of adding i.MX93 LCDIF support.

Tested-by: Alexander Stein <alexander.stein@ew.tq-group.com>
Reviewed-by: Alexander Stein <alexander.stein@ew.tq-group.com>
Reviewed-by: Marek Vasut <marex@denx.de>
Signed-off-by: Liu Ying <victor.liu@nxp.com>
---
v5->v6:
* Add Marek's R-b tag.

v4->v5:
* Add Alexander's T-b tag.

v3->v4:
* Add Alexander's R-b tag.

v2->v3:
* Fix a trivial typo in commit message.

v1->v2:
* Split from patch 2/2 in v1. (Marek, Alexander)

 drivers/gpu/drm/mxsfb/lcdif_drv.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpu/drm/mxsfb/lcdif_drv.c b/drivers/gpu/drm/mxsfb/lcdif_drv.c
index dc85498b81cd..c9d8cbb21407 100644
--- a/drivers/gpu/drm/mxsfb/lcdif_drv.c
+++ b/drivers/gpu/drm/mxsfb/lcdif_drv.c
@@ -251,6 +251,7 @@ static const struct drm_driver lcdif_driver = {
 
 static const struct of_device_id lcdif_dt_ids[] = {
 	{ .compatible = "fsl,imx8mp-lcdif" },
+	{ .compatible = "fsl,imx93-lcdif" },
 	{ /* sentinel */ }
 };
 MODULE_DEVICE_TABLE(of, lcdif_dt_ids);
-- 
2.37.1

[PATCH v6 6/6] drm: lcdif: Add i.MX93 LCDIF compatible string

[Liu Ying]

With all previous preparations done to make it possible for the
single LCDIF embedded in i.MX93 SoC to drive multiple displays
simultaneously, add i.MX93 LCDIF compatible string as the last
step of adding i.MX93 LCDIF support.

Tested-by: Alexander Stein <alexander.stein@ew.tq-group.com>
Reviewed-by: Alexander Stein <alexander.stein@ew.tq-group.com>
Reviewed-by: Marek Vasut <marex@denx.de>
Signed-off-by: Liu Ying <victor.liu@nxp.com>
---
v5->v6:
* Add Marek's R-b tag.

v4->v5:
* Add Alexander's T-b tag.

v3->v4:
* Add Alexander's R-b tag.

v2->v3:
* Fix a trivial typo in commit message.

v1->v2:
* Split from patch 2/2 in v1. (Marek, Alexander)

 drivers/gpu/drm/mxsfb/lcdif_drv.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpu/drm/mxsfb/lcdif_drv.c b/drivers/gpu/drm/mxsfb/lcdif_drv.c
index dc85498b81cd..c9d8cbb21407 100644
--- a/drivers/gpu/drm/mxsfb/lcdif_drv.c
+++ b/drivers/gpu/drm/mxsfb/lcdif_drv.c
@@ -251,6 +251,7 @@ static const struct drm_driver lcdif_driver = {
 
 static const struct of_device_id lcdif_dt_ids[] = {
 	{ .compatible = "fsl,imx8mp-lcdif" },
+	{ .compatible = "fsl,imx93-lcdif" },
 	{ /* sentinel */ }
 };
 MODULE_DEVICE_TABLE(of, lcdif_dt_ids);
-- 
2.37.1

Re: [PATCH v6 2/6] drm: lcdif: Drop unnecessary NULL pointer check on lcdif->bridge

[Marek Vasut]

On 5/10/23 11:24, Liu Ying wrote:
> A valid bridge is already found in lcdif_attach_bridge() and set
> to lcdif->bridge, so lcdif->bridge cannot be a NULL pointer. Drop
> the unnecessary NULL pointer check in KMS stage.
> 
> Tested-by: Alexander Stein <alexander.stein@ew.tq-group.com>
> Reviewed-by: Alexander Stein <alexander.stein@ew.tq-group.com>
> Signed-off-by: Liu Ying <victor.liu@nxp.com>

Reviewed-by: Marek Vasut <marex@denx.de>

Re: [PATCH v6 2/6] drm: lcdif: Drop unnecessary NULL pointer check on lcdif->bridge

[Marek Vasut]

On 5/10/23 11:24, Liu Ying wrote:
> A valid bridge is already found in lcdif_attach_bridge() and set
> to lcdif->bridge, so lcdif->bridge cannot be a NULL pointer. Drop
> the unnecessary NULL pointer check in KMS stage.
> 
> Tested-by: Alexander Stein <alexander.stein@ew.tq-group.com>
> Reviewed-by: Alexander Stein <alexander.stein@ew.tq-group.com>
> Signed-off-by: Liu Ying <victor.liu@nxp.com>

Reviewed-by: Marek Vasut <marex@denx.de>

Re: [PATCH v6 5/6] drm: lcdif: Add multiple encoders and first bridges support

[Marek Vasut]

On 5/10/23 11:24, Liu Ying wrote:
> The single LCDIF embedded in i.MX93 SoC may drive multiple displays
> simultaneously.  Look at LCDIF output port's remote port parents to
> find all enabled first bridges.  Add an encoder for each found bridge
> and attach the bridge to the encoder.  This is a preparation for
> adding i.MX93 LCDIF support.
> 
> Tested-by: Alexander Stein <alexander.stein@ew.tq-group.com>
> Acked-by: Alexander Stein <alexander.stein@ew.tq-group.com>
> Signed-off-by: Liu Ying <victor.liu@nxp.com>
> ---
> v5->v6:
> * Drop MAX_DISPLAYS macro. (Marek)
> * Drop the encoder member in struct lcdif_drm_private.
> * Drop endpoint id check.

It might be nice to check (based on driver data for each IP variant) the 
encoder count, but that can be a separate patch.

Reviewed-by: Marek Vasut <marex@denx.de>

Thanks !

btw if this doesn't get picked by someone in like a week or two, let me 
know and I'll apply this via drm-misc .

Re: [PATCH v6 5/6] drm: lcdif: Add multiple encoders and first bridges support

[Marek Vasut]

On 5/10/23 11:24, Liu Ying wrote:
> The single LCDIF embedded in i.MX93 SoC may drive multiple displays
> simultaneously.  Look at LCDIF output port's remote port parents to
> find all enabled first bridges.  Add an encoder for each found bridge
> and attach the bridge to the encoder.  This is a preparation for
> adding i.MX93 LCDIF support.
> 
> Tested-by: Alexander Stein <alexander.stein@ew.tq-group.com>
> Acked-by: Alexander Stein <alexander.stein@ew.tq-group.com>
> Signed-off-by: Liu Ying <victor.liu@nxp.com>
> ---
> v5->v6:
> * Drop MAX_DISPLAYS macro. (Marek)
> * Drop the encoder member in struct lcdif_drm_private.
> * Drop endpoint id check.

It might be nice to check (based on driver data for each IP variant) the 
encoder count, but that can be a separate patch.

Reviewed-by: Marek Vasut <marex@denx.de>

Thanks !

btw if this doesn't get picked by someone in like a week or two, let me 
know and I'll apply this via drm-misc .

Re: [PATCH v6 5/6] drm: lcdif: Add multiple encoders and first bridges support

[Ying Liu]

Hi Marek,

On Thu, May 11, 2023 at 12:24 AM Marek Vasut <marex@denx.de> wrote:
> On 5/10/23 11:24, Liu Ying wrote:
> > The single LCDIF embedded in i.MX93 SoC may drive multiple displays
> > simultaneously.  Look at LCDIF output port's remote port parents to
> > find all enabled first bridges.  Add an encoder for each found bridge
> > and attach the bridge to the encoder.  This is a preparation for
> > adding i.MX93 LCDIF support.
> >
> > Tested-by: Alexander Stein <alexander.stein@ew.tq-group.com>
> > Acked-by: Alexander Stein <alexander.stein@ew.tq-group.com>
> > Signed-off-by: Liu Ying <victor.liu@nxp.com>
> > ---
> > v5->v6:
> > * Drop MAX_DISPLAYS macro. (Marek)
> > * Drop the encoder member in struct lcdif_drm_private.
> > * Drop endpoint id check.
>
> It might be nice to check (based on driver data for each IP variant) the
> encoder count, but that can be a separate patch.
>
> Reviewed-by: Marek Vasut <marex@denx.de>
>
> Thanks !
>
> btw if this doesn't get picked by someone in like a week or two, let me
> know and I'll apply this via drm-misc .

Thanks for your review.  I don't see any more comments in two weeks.
Can you please go ahead to apply this series?

Regards,
Liu Ying

Re: [PATCH v6 5/6] drm: lcdif: Add multiple encoders and first bridges support

[Ying Liu]

Hi Marek,

On Thu, May 11, 2023 at 12:24 AM Marek Vasut <marex@denx.de> wrote:
> On 5/10/23 11:24, Liu Ying wrote:
> > The single LCDIF embedded in i.MX93 SoC may drive multiple displays
> > simultaneously.  Look at LCDIF output port's remote port parents to
> > find all enabled first bridges.  Add an encoder for each found bridge
> > and attach the bridge to the encoder.  This is a preparation for
> > adding i.MX93 LCDIF support.
> >
> > Tested-by: Alexander Stein <alexander.stein@ew.tq-group.com>
> > Acked-by: Alexander Stein <alexander.stein@ew.tq-group.com>
> > Signed-off-by: Liu Ying <victor.liu@nxp.com>
> > ---
> > v5->v6:
> > * Drop MAX_DISPLAYS macro. (Marek)
> > * Drop the encoder member in struct lcdif_drm_private.
> > * Drop endpoint id check.
>
> It might be nice to check (based on driver data for each IP variant) the
> encoder count, but that can be a separate patch.
>
> Reviewed-by: Marek Vasut <marex@denx.de>
>
> Thanks !
>
> btw if this doesn't get picked by someone in like a week or two, let me
> know and I'll apply this via drm-misc .

Thanks for your review.  I don't see any more comments in two weeks.
Can you please go ahead to apply this series?

Regards,
Liu Ying

Re: [PATCH v6 5/6] drm: lcdif: Add multiple encoders and first bridges support

[Ying Liu]

Hi Marek,

On Thu, May 11, 2023 at 12:24 AM Marek Vasut <marex@denx.de> wrote:
> On 5/10/23 11:24, Liu Ying wrote:
> > The single LCDIF embedded in i.MX93 SoC may drive multiple displays
> > simultaneously.  Look at LCDIF output port's remote port parents to
> > find all enabled first bridges.  Add an encoder for each found bridge
> > and attach the bridge to the encoder.  This is a preparation for
> > adding i.MX93 LCDIF support.
> >
> > Tested-by: Alexander Stein <alexander.stein@ew.tq-group.com>
> > Acked-by: Alexander Stein <alexander.stein@ew.tq-group.com>
> > Signed-off-by: Liu Ying <victor.liu@nxp.com>
> > ---
> > v5->v6:
> > * Drop MAX_DISPLAYS macro. (Marek)
> > * Drop the encoder member in struct lcdif_drm_private.
> > * Drop endpoint id check.
>
> It might be nice to check (based on driver data for each IP variant) the
> encoder count, but that can be a separate patch.
>
> Reviewed-by: Marek Vasut <marex@denx.de>
>
> Thanks !
>
> btw if this doesn't get picked by someone in like a week or two, let me
> know and I'll apply this via drm-misc .

Thanks for your review.  I don't see any more comments in two weeks.
Can you please go ahead to apply this series?

Regards,
Liu Ying

_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
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Re: [PATCH v6 5/6] drm: lcdif: Add multiple encoders and first bridges support

[Marek Vasut]

On 5/25/23 03:45, Ying Liu wrote:
> Hi Marek,

Hi,

> On Thu, May 11, 2023 at 12:24 AM Marek Vasut <marex@denx.de> wrote:
>> On 5/10/23 11:24, Liu Ying wrote:
>>> The single LCDIF embedded in i.MX93 SoC may drive multiple displays
>>> simultaneously.  Look at LCDIF output port's remote port parents to
>>> find all enabled first bridges.  Add an encoder for each found bridge
>>> and attach the bridge to the encoder.  This is a preparation for
>>> adding i.MX93 LCDIF support.
>>>
>>> Tested-by: Alexander Stein <alexander.stein@ew.tq-group.com>
>>> Acked-by: Alexander Stein <alexander.stein@ew.tq-group.com>
>>> Signed-off-by: Liu Ying <victor.liu@nxp.com>
>>> ---
>>> v5->v6:
>>> * Drop MAX_DISPLAYS macro. (Marek)
>>> * Drop the encoder member in struct lcdif_drm_private.
>>> * Drop endpoint id check.
>>
>> It might be nice to check (based on driver data for each IP variant) the
>> encoder count, but that can be a separate patch.
>>
>> Reviewed-by: Marek Vasut <marex@denx.de>
>>
>> Thanks !
>>
>> btw if this doesn't get picked by someone in like a week or two, let me
>> know and I'll apply this via drm-misc .
> 
> Thanks for your review.  I don't see any more comments in two weeks.
> Can you please go ahead to apply this series?

Done, applied to drm-misc-next , thanks !

Thanks for the reminder too .

Re: [PATCH v6 5/6] drm: lcdif: Add multiple encoders and first bridges support

[Marek Vasut]

On 5/25/23 03:45, Ying Liu wrote:
> Hi Marek,

Hi,

> On Thu, May 11, 2023 at 12:24 AM Marek Vasut <marex@denx.de> wrote:
>> On 5/10/23 11:24, Liu Ying wrote:
>>> The single LCDIF embedded in i.MX93 SoC may drive multiple displays
>>> simultaneously.  Look at LCDIF output port's remote port parents to
>>> find all enabled first bridges.  Add an encoder for each found bridge
>>> and attach the bridge to the encoder.  This is a preparation for
>>> adding i.MX93 LCDIF support.
>>>
>>> Tested-by: Alexander Stein <alexander.stein@ew.tq-group.com>
>>> Acked-by: Alexander Stein <alexander.stein@ew.tq-group.com>
>>> Signed-off-by: Liu Ying <victor.liu@nxp.com>
>>> ---
>>> v5->v6:
>>> * Drop MAX_DISPLAYS macro. (Marek)
>>> * Drop the encoder member in struct lcdif_drm_private.
>>> * Drop endpoint id check.
>>
>> It might be nice to check (based on driver data for each IP variant) the
>> encoder count, but that can be a separate patch.
>>
>> Reviewed-by: Marek Vasut <marex@denx.de>
>>
>> Thanks !
>>
>> btw if this doesn't get picked by someone in like a week or two, let me
>> know and I'll apply this via drm-misc .
> 
> Thanks for your review.  I don't see any more comments in two weeks.
> Can you please go ahead to apply this series?

Done, applied to drm-misc-next , thanks !

Thanks for the reminder too .

_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

Re: [PATCH v6 5/6] drm: lcdif: Add multiple encoders and first bridges support

[Marek Vasut]

On 5/25/23 03:45, Ying Liu wrote:
> Hi Marek,

Hi,

> On Thu, May 11, 2023 at 12:24 AM Marek Vasut <marex@denx.de> wrote:
>> On 5/10/23 11:24, Liu Ying wrote:
>>> The single LCDIF embedded in i.MX93 SoC may drive multiple displays
>>> simultaneously.  Look at LCDIF output port's remote port parents to
>>> find all enabled first bridges.  Add an encoder for each found bridge
>>> and attach the bridge to the encoder.  This is a preparation for
>>> adding i.MX93 LCDIF support.
>>>
>>> Tested-by: Alexander Stein <alexander.stein@ew.tq-group.com>
>>> Acked-by: Alexander Stein <alexander.stein@ew.tq-group.com>
>>> Signed-off-by: Liu Ying <victor.liu@nxp.com>
>>> ---
>>> v5->v6:
>>> * Drop MAX_DISPLAYS macro. (Marek)
>>> * Drop the encoder member in struct lcdif_drm_private.
>>> * Drop endpoint id check.
>>
>> It might be nice to check (based on driver data for each IP variant) the
>> encoder count, but that can be a separate patch.
>>
>> Reviewed-by: Marek Vasut <marex@denx.de>
>>
>> Thanks !
>>
>> btw if this doesn't get picked by someone in like a week or two, let me
>> know and I'll apply this via drm-misc .
> 
> Thanks for your review.  I don't see any more comments in two weeks.
> Can you please go ahead to apply this series?

Done, applied to drm-misc-next , thanks !

Thanks for the reminder too .