[PATCH 0/2] drm/meson: Error handling fix when AFBCD is used

[PATCH 0/2] drm/meson: Error handling fix when AFBCD is used

[Martin Blumenstingl]

Hi Neil,

this series consists of a small cleanup patch and a fix for the error
handling in meson_drv_bind_master() when AFBCD is used.
The patches are based on drm-misc to not conflict with your previous
driver rework. Since the problem has not been observed in the wild I
decided not to Cc linux-stable.


Best regards,
Martin


Martin Blumenstingl (2):
  drm/meson: osd_afbcd: Add an exit callback to struct meson_afbcd_ops
  drm/meson: Fix error handling when afbcd.ops->init fails

 drivers/gpu/drm/meson/meson_drv.c       | 25 +++++++--------
 drivers/gpu/drm/meson/meson_osd_afbcd.c | 41 ++++++++++++++++---------
 drivers/gpu/drm/meson/meson_osd_afbcd.h |  1 +
 3 files changed, 41 insertions(+), 26 deletions(-)

-- 
2.34.1

[PATCH 1/2] drm/meson: osd_afbcd: Add an exit callback to struct meson_afbcd_ops

[Martin Blumenstingl]

Use this to simplify the driver shutdown. It will also come handy when
fixing the error handling in meson_drv_bind_master().

Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
---
 drivers/gpu/drm/meson/meson_drv.c       |  6 ++--
 drivers/gpu/drm/meson/meson_osd_afbcd.c | 41 ++++++++++++++++---------
 drivers/gpu/drm/meson/meson_osd_afbcd.h |  1 +
 3 files changed, 30 insertions(+), 18 deletions(-)

diff --git a/drivers/gpu/drm/meson/meson_drv.c b/drivers/gpu/drm/meson/meson_drv.c
index 80f1d439841a..b919271a6e50 100644
--- a/drivers/gpu/drm/meson/meson_drv.c
+++ b/drivers/gpu/drm/meson/meson_drv.c
@@ -385,10 +385,8 @@ static void meson_drv_unbind(struct device *dev)
 	free_irq(priv->vsync_irq, drm);
 	drm_dev_put(drm);
 
-	if (priv->afbcd.ops) {
-		priv->afbcd.ops->reset(priv);
-		meson_rdma_free(priv);
-	}
+	if (priv->afbcd.ops)
+		priv->afbcd.ops->exit(priv);
 }
 
 static const struct component_master_ops meson_drv_master_ops = {
diff --git a/drivers/gpu/drm/meson/meson_osd_afbcd.c b/drivers/gpu/drm/meson/meson_osd_afbcd.c
index ffc6b584dbf8..0cdbe899402f 100644
--- a/drivers/gpu/drm/meson/meson_osd_afbcd.c
+++ b/drivers/gpu/drm/meson/meson_osd_afbcd.c
@@ -79,11 +79,6 @@ static bool meson_gxm_afbcd_supported_fmt(u64 modifier, uint32_t format)
 	return meson_gxm_afbcd_pixel_fmt(modifier, format) >= 0;
 }
 
-static int meson_gxm_afbcd_init(struct meson_drm *priv)
-{
-	return 0;
-}
-
 static int meson_gxm_afbcd_reset(struct meson_drm *priv)
 {
 	writel_relaxed(VIU_SW_RESET_OSD1_AFBCD,
@@ -93,6 +88,16 @@ static int meson_gxm_afbcd_reset(struct meson_drm *priv)
 	return 0;
 }
 
+static int meson_gxm_afbcd_init(struct meson_drm *priv)
+{
+	return 0;
+}
+
+static void meson_gxm_afbcd_exit(struct meson_drm *priv)
+{
+	meson_gxm_afbcd_reset(priv);
+}
+
 static int meson_gxm_afbcd_enable(struct meson_drm *priv)
 {
 	writel_relaxed(FIELD_PREP(OSD1_AFBCD_ID_FIFO_THRD, 0x40) |
@@ -172,6 +177,7 @@ static int meson_gxm_afbcd_setup(struct meson_drm *priv)
 
 struct meson_afbcd_ops meson_afbcd_gxm_ops = {
 	.init = meson_gxm_afbcd_init,
+	.exit = meson_gxm_afbcd_exit,
 	.reset = meson_gxm_afbcd_reset,
 	.enable = meson_gxm_afbcd_enable,
 	.disable = meson_gxm_afbcd_disable,
@@ -269,6 +275,18 @@ static bool meson_g12a_afbcd_supported_fmt(u64 modifier, uint32_t format)
 	return meson_g12a_afbcd_pixel_fmt(modifier, format) >= 0;
 }
 
+static int meson_g12a_afbcd_reset(struct meson_drm *priv)
+{
+	meson_rdma_reset(priv);
+
+	meson_rdma_writel_sync(priv, VIU_SW_RESET_G12A_AFBC_ARB |
+			       VIU_SW_RESET_G12A_OSD1_AFBCD,
+			       VIU_SW_RESET);
+	meson_rdma_writel_sync(priv, 0, VIU_SW_RESET);
+
+	return 0;
+}
+
 static int meson_g12a_afbcd_init(struct meson_drm *priv)
 {
 	int ret;
@@ -286,16 +304,10 @@ static int meson_g12a_afbcd_init(struct meson_drm *priv)
 	return 0;
 }
 
-static int meson_g12a_afbcd_reset(struct meson_drm *priv)
+static void meson_g12a_afbcd_exit(struct meson_drm *priv)
 {
-	meson_rdma_reset(priv);
-
-	meson_rdma_writel_sync(priv, VIU_SW_RESET_G12A_AFBC_ARB |
-			       VIU_SW_RESET_G12A_OSD1_AFBCD,
-			       VIU_SW_RESET);
-	meson_rdma_writel_sync(priv, 0, VIU_SW_RESET);
-
-	return 0;
+	meson_g12a_afbcd_reset(priv);
+	meson_rdma_free(priv);
 }
 
 static int meson_g12a_afbcd_enable(struct meson_drm *priv)
@@ -380,6 +392,7 @@ static int meson_g12a_afbcd_setup(struct meson_drm *priv)
 
 struct meson_afbcd_ops meson_afbcd_g12a_ops = {
 	.init = meson_g12a_afbcd_init,
+	.exit = meson_g12a_afbcd_exit,
 	.reset = meson_g12a_afbcd_reset,
 	.enable = meson_g12a_afbcd_enable,
 	.disable = meson_g12a_afbcd_disable,
diff --git a/drivers/gpu/drm/meson/meson_osd_afbcd.h b/drivers/gpu/drm/meson/meson_osd_afbcd.h
index 5e5523304f42..e77ddeb6416f 100644
--- a/drivers/gpu/drm/meson/meson_osd_afbcd.h
+++ b/drivers/gpu/drm/meson/meson_osd_afbcd.h
@@ -14,6 +14,7 @@
 
 struct meson_afbcd_ops {
 	int (*init)(struct meson_drm *priv);
+	void (*exit)(struct meson_drm *priv);
 	int (*reset)(struct meson_drm *priv);
 	int (*enable)(struct meson_drm *priv);
 	int (*disable)(struct meson_drm *priv);
-- 
2.34.1

[PATCH 2/2] drm/meson: Fix error handling when afbcd.ops->init fails

[Martin Blumenstingl]

When afbcd.ops->init fails we need to free the struct drm_device. Also
all errors which come after afbcd.ops->init was successful need to exit
the AFBCD, just like meson_drv_unbind() does.

Fixes: d1b5e41e13a7e9 ("drm/meson: Add AFBCD module driver")
Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
---
 drivers/gpu/drm/meson/meson_drv.c | 19 +++++++++++--------
 1 file changed, 11 insertions(+), 8 deletions(-)

diff --git a/drivers/gpu/drm/meson/meson_drv.c b/drivers/gpu/drm/meson/meson_drv.c
index b919271a6e50..26aeaf0ab86e 100644
--- a/drivers/gpu/drm/meson/meson_drv.c
+++ b/drivers/gpu/drm/meson/meson_drv.c
@@ -302,42 +302,42 @@ static int meson_drv_bind_master(struct device *dev, bool has_components)
 	if (priv->afbcd.ops) {
 		ret = priv->afbcd.ops->init(priv);
 		if (ret)
-			return ret;
+			goto free_drm;
 	}
 
 	/* Encoder Initialization */
 
 	ret = meson_encoder_cvbs_init(priv);
 	if (ret)
-		goto free_drm;
+		goto exit_afbcd;
 
 	if (has_components) {
 		ret = component_bind_all(drm->dev, drm);
 		if (ret) {
 			dev_err(drm->dev, "Couldn't bind all components\n");
-			goto free_drm;
+			goto exit_afbcd;
 		}
 	}
 
 	ret = meson_encoder_hdmi_init(priv);
 	if (ret)
-		goto free_drm;
+		goto exit_afbcd;
 
 	ret = meson_plane_create(priv);
 	if (ret)
-		goto free_drm;
+		goto exit_afbcd;
 
 	ret = meson_overlay_create(priv);
 	if (ret)
-		goto free_drm;
+		goto exit_afbcd;
 
 	ret = meson_crtc_create(priv);
 	if (ret)
-		goto free_drm;
+		goto exit_afbcd;
 
 	ret = request_irq(priv->vsync_irq, meson_irq, 0, drm->driver->name, drm);
 	if (ret)
-		goto free_drm;
+		goto exit_afbcd;
 
 	drm_mode_config_reset(drm);
 
@@ -355,6 +355,9 @@ static int meson_drv_bind_master(struct device *dev, bool has_components)
 
 uninstall_irq:
 	free_irq(priv->vsync_irq, drm);
+exit_afbcd:
+	if (priv->afbcd.ops)
+		priv->afbcd.ops->exit(priv);
 free_drm:
 	drm_dev_put(drm);
 
-- 
2.34.1

Re: [PATCH 2/2] drm/meson: Fix error handling when afbcd.ops->init fails

[Neil Armstrong]

On 31/12/2021 00:55, Martin Blumenstingl wrote:
> When afbcd.ops->init fails we need to free the struct drm_device. Also
> all errors which come after afbcd.ops->init was successful need to exit
> the AFBCD, just like meson_drv_unbind() does.
> 
> Fixes: d1b5e41e13a7e9 ("drm/meson: Add AFBCD module driver")
> Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
> ---
>  drivers/gpu/drm/meson/meson_drv.c | 19 +++++++++++--------
>  1 file changed, 11 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/gpu/drm/meson/meson_drv.c b/drivers/gpu/drm/meson/meson_drv.c
> index b919271a6e50..26aeaf0ab86e 100644
> --- a/drivers/gpu/drm/meson/meson_drv.c
> +++ b/drivers/gpu/drm/meson/meson_drv.c
> @@ -302,42 +302,42 @@ static int meson_drv_bind_master(struct device *dev, bool has_components)
>  	if (priv->afbcd.ops) {
>  		ret = priv->afbcd.ops->init(priv);
>  		if (ret)
> -			return ret;
> +			goto free_drm;
>  	}
>  
>  	/* Encoder Initialization */
>  
>  	ret = meson_encoder_cvbs_init(priv);
>  	if (ret)
> -		goto free_drm;
> +		goto exit_afbcd;
>  
>  	if (has_components) {
>  		ret = component_bind_all(drm->dev, drm);
>  		if (ret) {
>  			dev_err(drm->dev, "Couldn't bind all components\n");
> -			goto free_drm;
> +			goto exit_afbcd;
>  		}
>  	}
>  
>  	ret = meson_encoder_hdmi_init(priv);
>  	if (ret)
> -		goto free_drm;
> +		goto exit_afbcd;
>  
>  	ret = meson_plane_create(priv);
>  	if (ret)
> -		goto free_drm;
> +		goto exit_afbcd;
>  
>  	ret = meson_overlay_create(priv);
>  	if (ret)
> -		goto free_drm;
> +		goto exit_afbcd;
>  
>  	ret = meson_crtc_create(priv);
>  	if (ret)
> -		goto free_drm;
> +		goto exit_afbcd;
>  
>  	ret = request_irq(priv->vsync_irq, meson_irq, 0, drm->driver->name, drm);
>  	if (ret)
> -		goto free_drm;
> +		goto exit_afbcd;
>  
>  	drm_mode_config_reset(drm);
>  
> @@ -355,6 +355,9 @@ static int meson_drv_bind_master(struct device *dev, bool has_components)
>  
>  uninstall_irq:
>  	free_irq(priv->vsync_irq, drm);
> +exit_afbcd:
> +	if (priv->afbcd.ops)
> +		priv->afbcd.ops->exit(priv);
>  free_drm:
>  	drm_dev_put(drm);
>  
> 

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

Thanks,

But this depends on patch 1, so I'll add the same Fixes tag on patch 1 and add to drm-misc-next so it won't pollute -fixes but will still be eventually be backported when landing on linus master.

Neil

Re: [PATCH 1/2] drm/meson: osd_afbcd: Add an exit callback to struct meson_afbcd_ops

[Neil Armstrong]

On 31/12/2021 00:55, Martin Blumenstingl wrote:
> Use this to simplify the driver shutdown. It will also come handy when
> fixing the error handling in meson_drv_bind_master().
> 
> Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
> ---
>  drivers/gpu/drm/meson/meson_drv.c       |  6 ++--
>  drivers/gpu/drm/meson/meson_osd_afbcd.c | 41 ++++++++++++++++---------
>  drivers/gpu/drm/meson/meson_osd_afbcd.h |  1 +
>  3 files changed, 30 insertions(+), 18 deletions(-)
> 
> diff --git a/drivers/gpu/drm/meson/meson_drv.c b/drivers/gpu/drm/meson/meson_drv.c
> index 80f1d439841a..b919271a6e50 100644
> --- a/drivers/gpu/drm/meson/meson_drv.c
> +++ b/drivers/gpu/drm/meson/meson_drv.c
> @@ -385,10 +385,8 @@ static void meson_drv_unbind(struct device *dev)
>  	free_irq(priv->vsync_irq, drm);
>  	drm_dev_put(drm);
>  
> -	if (priv->afbcd.ops) {
> -		priv->afbcd.ops->reset(priv);
> -		meson_rdma_free(priv);
> -	}
> +	if (priv->afbcd.ops)
> +		priv->afbcd.ops->exit(priv);
>  }
>  
>  static const struct component_master_ops meson_drv_master_ops = {
> diff --git a/drivers/gpu/drm/meson/meson_osd_afbcd.c b/drivers/gpu/drm/meson/meson_osd_afbcd.c
> index ffc6b584dbf8..0cdbe899402f 100644
> --- a/drivers/gpu/drm/meson/meson_osd_afbcd.c
> +++ b/drivers/gpu/drm/meson/meson_osd_afbcd.c
> @@ -79,11 +79,6 @@ static bool meson_gxm_afbcd_supported_fmt(u64 modifier, uint32_t format)
>  	return meson_gxm_afbcd_pixel_fmt(modifier, format) >= 0;
>  }
>  
> -static int meson_gxm_afbcd_init(struct meson_drm *priv)
> -{
> -	return 0;
> -}
> -
>  static int meson_gxm_afbcd_reset(struct meson_drm *priv)
>  {
>  	writel_relaxed(VIU_SW_RESET_OSD1_AFBCD,
> @@ -93,6 +88,16 @@ static int meson_gxm_afbcd_reset(struct meson_drm *priv)
>  	return 0;
>  }
>  
> +static int meson_gxm_afbcd_init(struct meson_drm *priv)
> +{
> +	return 0;
> +}
> +
> +static void meson_gxm_afbcd_exit(struct meson_drm *priv)
> +{
> +	meson_gxm_afbcd_reset(priv);
> +}
> +
>  static int meson_gxm_afbcd_enable(struct meson_drm *priv)
>  {
>  	writel_relaxed(FIELD_PREP(OSD1_AFBCD_ID_FIFO_THRD, 0x40) |
> @@ -172,6 +177,7 @@ static int meson_gxm_afbcd_setup(struct meson_drm *priv)
>  
>  struct meson_afbcd_ops meson_afbcd_gxm_ops = {
>  	.init = meson_gxm_afbcd_init,
> +	.exit = meson_gxm_afbcd_exit,
>  	.reset = meson_gxm_afbcd_reset,
>  	.enable = meson_gxm_afbcd_enable,
>  	.disable = meson_gxm_afbcd_disable,
> @@ -269,6 +275,18 @@ static bool meson_g12a_afbcd_supported_fmt(u64 modifier, uint32_t format)
>  	return meson_g12a_afbcd_pixel_fmt(modifier, format) >= 0;
>  }
>  
> +static int meson_g12a_afbcd_reset(struct meson_drm *priv)
> +{
> +	meson_rdma_reset(priv);
> +
> +	meson_rdma_writel_sync(priv, VIU_SW_RESET_G12A_AFBC_ARB |
> +			       VIU_SW_RESET_G12A_OSD1_AFBCD,
> +			       VIU_SW_RESET);
> +	meson_rdma_writel_sync(priv, 0, VIU_SW_RESET);
> +
> +	return 0;
> +}
> +
>  static int meson_g12a_afbcd_init(struct meson_drm *priv)
>  {
>  	int ret;
> @@ -286,16 +304,10 @@ static int meson_g12a_afbcd_init(struct meson_drm *priv)
>  	return 0;
>  }
>  
> -static int meson_g12a_afbcd_reset(struct meson_drm *priv)
> +static void meson_g12a_afbcd_exit(struct meson_drm *priv)
>  {
> -	meson_rdma_reset(priv);
> -
> -	meson_rdma_writel_sync(priv, VIU_SW_RESET_G12A_AFBC_ARB |
> -			       VIU_SW_RESET_G12A_OSD1_AFBCD,
> -			       VIU_SW_RESET);
> -	meson_rdma_writel_sync(priv, 0, VIU_SW_RESET);
> -
> -	return 0;
> +	meson_g12a_afbcd_reset(priv);
> +	meson_rdma_free(priv);
>  }
>  
>  static int meson_g12a_afbcd_enable(struct meson_drm *priv)
> @@ -380,6 +392,7 @@ static int meson_g12a_afbcd_setup(struct meson_drm *priv)
>  
>  struct meson_afbcd_ops meson_afbcd_g12a_ops = {
>  	.init = meson_g12a_afbcd_init,
> +	.exit = meson_g12a_afbcd_exit,
>  	.reset = meson_g12a_afbcd_reset,
>  	.enable = meson_g12a_afbcd_enable,
>  	.disable = meson_g12a_afbcd_disable,
> diff --git a/drivers/gpu/drm/meson/meson_osd_afbcd.h b/drivers/gpu/drm/meson/meson_osd_afbcd.h
> index 5e5523304f42..e77ddeb6416f 100644
> --- a/drivers/gpu/drm/meson/meson_osd_afbcd.h
> +++ b/drivers/gpu/drm/meson/meson_osd_afbcd.h
> @@ -14,6 +14,7 @@
>  
>  struct meson_afbcd_ops {
>  	int (*init)(struct meson_drm *priv);
> +	void (*exit)(struct meson_drm *priv);
>  	int (*reset)(struct meson_drm *priv);
>  	int (*enable)(struct meson_drm *priv);
>  	int (*disable)(struct meson_drm *priv);
> 

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

Thanks for fixing this

Neil