[PATCH v3 0/4] drm: Provide a simple encoder

[PATCH v3 0/4] drm: Provide a simple encoder

[Thomas Zimmermann]

Many DRM drivers implement an encoder with an empty implementation. This
patchset adds drm_simple_encoder_init(), which can be used by drivers
instead. Except for the destroy callback, the simple encoder's implementation
is empty.

The patchset also converts 4 encoder instances to use the simple-encoder
helpers. But there are at least 11 other drivers which can use the helper
and I think I did not examine all drivers yet.

The patchset was smoke-tested on mgag200 by running the fbdev console
and Gnome on X11.

v3:
	* remove drm_simple_encoder_create() for lack of users (Sam, Daniel)
	* provide more precise documentation (Sam)
v2:
	* move simple encoder to KMS helpers (Daniel)
	* remove name argument; simplifies implementation (Gerd)
	* don't allocate with devm_ interfaces; unsafe with DRM (Noralf)

Thomas Zimmermann (4):
  drm/simple-kms: Add drm_simple_encoder_{init,create}()
  drm/ast: Use simple encoder
  drm/mgag200: Use simple encoder
  drm/qxl: Use simple encoder

 drivers/gpu/drm/ast/ast_drv.h           |  6 +-
 drivers/gpu/drm/ast/ast_mode.c          | 25 +++-----
 drivers/gpu/drm/drm_simple_kms_helper.c | 34 +++++++++-
 drivers/gpu/drm/mgag200/mgag200_drv.h   |  9 +--
 drivers/gpu/drm/mgag200/mgag200_mode.c  | 85 +++----------------------
 drivers/gpu/drm/qxl/qxl_display.c       | 18 +-----
 include/drm/drm_simple_kms_helper.h     |  4 ++
 7 files changed, 59 insertions(+), 122 deletions(-)

--
2.25.0

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[PATCH v3 1/4] drm/simple-kms: Add drm_simple_encoder_{init, create}()

[Thomas Zimmermann]

This patch makes the internal encoder implementation of the simple
KMS helpers available to drivers.

These simple-encoder helpers initialize an encoder with an empty
implementation. This covers the requirements of most of the existing
DRM drivers. A call to drm_simple_encoder_create() allocates and
initializes an encoder instance, a call to drm_simple_encoder_init()
initializes a pre-allocated instance.

v3:
	* remove drm_simple_encoder_create(); not required yet
	* provide more precise documentation
v2:
	* move simple encoder to KMS helpers
	* remove name argument; simplifies implementation
	* don't allocate with devm_ interfaces; unsafe with DRM

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
---
 drivers/gpu/drm/drm_simple_kms_helper.c | 34 ++++++++++++++++++++++---
 include/drm/drm_simple_kms_helper.h     |  4 +++
 2 files changed, 35 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/drm_simple_kms_helper.c b/drivers/gpu/drm/drm_simple_kms_helper.c
index 15fb516ae2d8..04309e4660de 100644
--- a/drivers/gpu/drm/drm_simple_kms_helper.c
+++ b/drivers/gpu/drm/drm_simple_kms_helper.c
@@ -26,12 +26,41 @@
  * entity. Some flexibility for code reuse is provided through a separately
  * allocated &drm_connector object and supporting optional &drm_bridge
  * encoder drivers.
+ *
+ * Many drivers require only a very simple encoder that fulfills the minimum
+ * requirements of the display pipeline and does not add additional
+ * functionality. The function drm_simple_encoder_init() provides an
+ * implementation of such an encoder.
  */
 
-static const struct drm_encoder_funcs drm_simple_kms_encoder_funcs = {
+static const struct drm_encoder_funcs drm_simple_encoder_funcs_cleanup = {
 	.destroy = drm_encoder_cleanup,
 };
 
+/**
+ * drm_simple_encoder_init - Initialize a preallocated encoder
+ * @dev: drm device
+ * @funcs: callbacks for this encoder
+ * @encoder_type: user visible type of the encoder
+ *
+ * Initialises a preallocated encoder that has no further functionality.
+ * Settings for possible CRTC and clones are left to their initial values.
+ * The encoder will be cleaned up automatically as part of the mode-setting
+ * cleanup.
+ *
+ * Returns:
+ * Zero on success, error code on failure.
+ */
+int drm_simple_encoder_init(struct drm_device *dev,
+			    struct drm_encoder *encoder,
+			    int encoder_type)
+{
+	return drm_encoder_init(dev, encoder,
+				&drm_simple_encoder_funcs_cleanup,
+				encoder_type, NULL);
+}
+EXPORT_SYMBOL(drm_simple_encoder_init);
+
 static enum drm_mode_status
 drm_simple_kms_crtc_mode_valid(struct drm_crtc *crtc,
 			       const struct drm_display_mode *mode)
@@ -288,8 +317,7 @@ int drm_simple_display_pipe_init(struct drm_device *dev,
 		return ret;
 
 	encoder->possible_crtcs = drm_crtc_mask(crtc);
-	ret = drm_encoder_init(dev, encoder, &drm_simple_kms_encoder_funcs,
-			       DRM_MODE_ENCODER_NONE, NULL);
+	ret = drm_simple_encoder_init(dev, encoder, DRM_MODE_ENCODER_NONE);
 	if (ret || !connector)
 		return ret;
 
diff --git a/include/drm/drm_simple_kms_helper.h b/include/drm/drm_simple_kms_helper.h
index e253ba7bea9d..a026375464ff 100644
--- a/include/drm/drm_simple_kms_helper.h
+++ b/include/drm/drm_simple_kms_helper.h
@@ -181,4 +181,8 @@ int drm_simple_display_pipe_init(struct drm_device *dev,
 			const uint64_t *format_modifiers,
 			struct drm_connector *connector);
 
+int drm_simple_encoder_init(struct drm_device *dev,
+			    struct drm_encoder *encoder,
+			    int encoder_type);
+
 #endif /* __LINUX_DRM_SIMPLE_KMS_HELPER_H */
-- 
2.25.0

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Re: [PATCH v3 1/4] drm/simple-kms: Add drm_simple_encoder_{init, create}()

[Sam Ravnborg]

On Tue, Feb 25, 2020 at 02:10:52PM +0100, Thomas Zimmermann wrote:
> This patch makes the internal encoder implementation of the simple
> KMS helpers available to drivers.
> 
> These simple-encoder helpers initialize an encoder with an empty
> implementation. This covers the requirements of most of the existing
> DRM drivers. A call to drm_simple_encoder_create() allocates and
> initializes an encoder instance, a call to drm_simple_encoder_init()
> initializes a pre-allocated instance.
> 
> v3:
> 	* remove drm_simple_encoder_create(); not required yet
> 	* provide more precise documentation
> v2:
> 	* move simple encoder to KMS helpers
> 	* remove name argument; simplifies implementation
> 	* don't allocate with devm_ interfaces; unsafe with DRM
> 
> Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Sam Ravnborg <sam@ravnborg.org>
> ---
>  drivers/gpu/drm/drm_simple_kms_helper.c | 34 ++++++++++++++++++++++---
>  include/drm/drm_simple_kms_helper.h     |  4 +++
>  2 files changed, 35 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/gpu/drm/drm_simple_kms_helper.c b/drivers/gpu/drm/drm_simple_kms_helper.c
> index 15fb516ae2d8..04309e4660de 100644
> --- a/drivers/gpu/drm/drm_simple_kms_helper.c
> +++ b/drivers/gpu/drm/drm_simple_kms_helper.c
> @@ -26,12 +26,41 @@
>   * entity. Some flexibility for code reuse is provided through a separately
>   * allocated &drm_connector object and supporting optional &drm_bridge
>   * encoder drivers.
> + *
> + * Many drivers require only a very simple encoder that fulfills the minimum
> + * requirements of the display pipeline and does not add additional
> + * functionality. The function drm_simple_encoder_init() provides an
> + * implementation of such an encoder.
>   */
>  
> -static const struct drm_encoder_funcs drm_simple_kms_encoder_funcs = {
> +static const struct drm_encoder_funcs drm_simple_encoder_funcs_cleanup = {
>  	.destroy = drm_encoder_cleanup,
>  };
>  
> +/**
> + * drm_simple_encoder_init - Initialize a preallocated encoder
> + * @dev: drm device
> + * @funcs: callbacks for this encoder
> + * @encoder_type: user visible type of the encoder
> + *
> + * Initialises a preallocated encoder that has no further functionality.
> + * Settings for possible CRTC and clones are left to their initial values.
> + * The encoder will be cleaned up automatically as part of the mode-setting
> + * cleanup.
> + *
> + * Returns:
> + * Zero on success, error code on failure.
> + */
> +int drm_simple_encoder_init(struct drm_device *dev,
> +			    struct drm_encoder *encoder,
> +			    int encoder_type)
> +{
> +	return drm_encoder_init(dev, encoder,
> +				&drm_simple_encoder_funcs_cleanup,
> +				encoder_type, NULL);
> +}
> +EXPORT_SYMBOL(drm_simple_encoder_init);
> +
>  static enum drm_mode_status
>  drm_simple_kms_crtc_mode_valid(struct drm_crtc *crtc,
>  			       const struct drm_display_mode *mode)
> @@ -288,8 +317,7 @@ int drm_simple_display_pipe_init(struct drm_device *dev,
>  		return ret;
>  
>  	encoder->possible_crtcs = drm_crtc_mask(crtc);
> -	ret = drm_encoder_init(dev, encoder, &drm_simple_kms_encoder_funcs,
> -			       DRM_MODE_ENCODER_NONE, NULL);
> +	ret = drm_simple_encoder_init(dev, encoder, DRM_MODE_ENCODER_NONE);
>  	if (ret || !connector)
>  		return ret;
>  
> diff --git a/include/drm/drm_simple_kms_helper.h b/include/drm/drm_simple_kms_helper.h
> index e253ba7bea9d..a026375464ff 100644
> --- a/include/drm/drm_simple_kms_helper.h
> +++ b/include/drm/drm_simple_kms_helper.h
> @@ -181,4 +181,8 @@ int drm_simple_display_pipe_init(struct drm_device *dev,
>  			const uint64_t *format_modifiers,
>  			struct drm_connector *connector);
>  
> +int drm_simple_encoder_init(struct drm_device *dev,
> +			    struct drm_encoder *encoder,
> +			    int encoder_type);
> +
>  #endif /* __LINUX_DRM_SIMPLE_KMS_HELPER_H */
> -- 
> 2.25.0
> 
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[PATCH v3 2/4] drm/ast: Use simple encoder

[Thomas Zimmermann]

The ast driver uses an empty implementation for its encoder. Replace
the code with the generic simple encoder.

v2:
	* rebase onto new simple-encoder interface

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Acked-by: Sam Ravnborg <sam@ravnborg.org>
---
 drivers/gpu/drm/ast/ast_drv.h  |  6 +-----
 drivers/gpu/drm/ast/ast_mode.c | 25 ++++++++-----------------
 2 files changed, 9 insertions(+), 22 deletions(-)

diff --git a/drivers/gpu/drm/ast/ast_drv.h b/drivers/gpu/drm/ast/ast_drv.h
index f5d8780776ae..656d591b154b 100644
--- a/drivers/gpu/drm/ast/ast_drv.h
+++ b/drivers/gpu/drm/ast/ast_drv.h
@@ -121,6 +121,7 @@ struct ast_private {
 		unsigned int next_index;
 	} cursor;
 
+	struct drm_encoder encoder;
 	struct drm_plane primary_plane;
 	struct drm_plane cursor_plane;
 
@@ -238,13 +239,8 @@ struct ast_crtc {
 	u8 offset_x, offset_y;
 };
 
-struct ast_encoder {
-	struct drm_encoder base;
-};
-
 #define to_ast_crtc(x) container_of(x, struct ast_crtc, base)
 #define to_ast_connector(x) container_of(x, struct ast_connector, base)
-#define to_ast_encoder(x) container_of(x, struct ast_encoder, base)
 
 struct ast_vbios_stdtable {
 	u8 misc;
diff --git a/drivers/gpu/drm/ast/ast_mode.c b/drivers/gpu/drm/ast/ast_mode.c
index 562ea6d9df13..7a9f20a2fd30 100644
--- a/drivers/gpu/drm/ast/ast_mode.c
+++ b/drivers/gpu/drm/ast/ast_mode.c
@@ -40,6 +40,7 @@
 #include <drm/drm_gem_vram_helper.h>
 #include <drm/drm_plane_helper.h>
 #include <drm/drm_probe_helper.h>
+#include <drm/drm_simple_kms_helper.h>
 
 #include "ast_drv.h"
 #include "ast_tables.h"
@@ -968,28 +969,18 @@ static int ast_crtc_init(struct drm_device *dev)
  * Encoder
  */
 
-static void ast_encoder_destroy(struct drm_encoder *encoder)
-{
-	drm_encoder_cleanup(encoder);
-	kfree(encoder);
-}
-
-static const struct drm_encoder_funcs ast_enc_funcs = {
-	.destroy = ast_encoder_destroy,
-};
-
 static int ast_encoder_init(struct drm_device *dev)
 {
-	struct ast_encoder *ast_encoder;
+	struct ast_private *ast = dev->dev_private;
+	struct drm_encoder *encoder = &ast->encoder;
+	int ret;
 
-	ast_encoder = kzalloc(sizeof(struct ast_encoder), GFP_KERNEL);
-	if (!ast_encoder)
-		return -ENOMEM;
+	ret = drm_simple_encoder_init(dev, encoder, DRM_MODE_ENCODER_DAC);
+	if (ret)
+		return ret;
 
-	drm_encoder_init(dev, &ast_encoder->base, &ast_enc_funcs,
-			 DRM_MODE_ENCODER_DAC, NULL);
+	encoder->possible_crtcs = 1;
 
-	ast_encoder->base.possible_crtcs = 1;
 	return 0;
 }
 
-- 
2.25.0

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[PATCH v3 3/4] drm/mgag200: Use simple encoder

[Thomas Zimmermann]

The mgag200 driver uses an empty implementation for its encoder. Replace
the code with the generic simple encoder.

v3:
	* init pre-allocated encoder with drm_simple_encoder_init()
v2:
	* rebase onto new simple-encoder interface

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
---
 drivers/gpu/drm/mgag200/mgag200_drv.h  |  9 +--
 drivers/gpu/drm/mgag200/mgag200_mode.c | 85 +++-----------------------
 2 files changed, 12 insertions(+), 82 deletions(-)

diff --git a/drivers/gpu/drm/mgag200/mgag200_drv.h b/drivers/gpu/drm/mgag200/mgag200_drv.h
index aa32aad222c2..9691252d6233 100644
--- a/drivers/gpu/drm/mgag200/mgag200_drv.h
+++ b/drivers/gpu/drm/mgag200/mgag200_drv.h
@@ -95,7 +95,6 @@
 #define MATROX_DPMS_CLEARED (-1)
 
 #define to_mga_crtc(x) container_of(x, struct mga_crtc, base)
-#define to_mga_encoder(x) container_of(x, struct mga_encoder, base)
 #define to_mga_connector(x) container_of(x, struct mga_connector, base)
 
 struct mga_crtc {
@@ -110,12 +109,6 @@ struct mga_mode_info {
 	struct mga_crtc *crtc;
 };
 
-struct mga_encoder {
-	struct drm_encoder base;
-	int last_dpms;
-};
-
-
 struct mga_i2c_chan {
 	struct i2c_adapter adapter;
 	struct drm_device *dev;
@@ -185,6 +178,8 @@ struct mga_device {
 
 	/* SE model number stored in reg 0x1e24 */
 	u32 unique_rev_id;
+
+	struct drm_encoder encoder;
 };
 
 static inline enum mga_type
diff --git a/drivers/gpu/drm/mgag200/mgag200_mode.c b/drivers/gpu/drm/mgag200/mgag200_mode.c
index 62a8e9ccb16d..efc9eaa6a4d4 100644
--- a/drivers/gpu/drm/mgag200/mgag200_mode.c
+++ b/drivers/gpu/drm/mgag200/mgag200_mode.c
@@ -15,6 +15,7 @@
 #include <drm/drm_fourcc.h>
 #include <drm/drm_plane_helper.h>
 #include <drm/drm_probe_helper.h>
+#include <drm/drm_simple_kms_helper.h>
 
 #include "mgag200_drv.h"
 
@@ -1449,76 +1450,6 @@ static void mga_crtc_init(struct mga_device *mdev)
 	drm_crtc_helper_add(&mga_crtc->base, &mga_helper_funcs);
 }
 
-/*
- * The encoder comes after the CRTC in the output pipeline, but before
- * the connector. It's responsible for ensuring that the digital
- * stream is appropriately converted into the output format. Setup is
- * very simple in this case - all we have to do is inform qemu of the
- * colour depth in order to ensure that it displays appropriately
- */
-
-/*
- * These functions are analagous to those in the CRTC code, but are intended
- * to handle any encoder-specific limitations
- */
-static void mga_encoder_mode_set(struct drm_encoder *encoder,
-				struct drm_display_mode *mode,
-				struct drm_display_mode *adjusted_mode)
-{
-
-}
-
-static void mga_encoder_dpms(struct drm_encoder *encoder, int state)
-{
-	return;
-}
-
-static void mga_encoder_prepare(struct drm_encoder *encoder)
-{
-}
-
-static void mga_encoder_commit(struct drm_encoder *encoder)
-{
-}
-
-static void mga_encoder_destroy(struct drm_encoder *encoder)
-{
-	struct mga_encoder *mga_encoder = to_mga_encoder(encoder);
-	drm_encoder_cleanup(encoder);
-	kfree(mga_encoder);
-}
-
-static const struct drm_encoder_helper_funcs mga_encoder_helper_funcs = {
-	.dpms = mga_encoder_dpms,
-	.mode_set = mga_encoder_mode_set,
-	.prepare = mga_encoder_prepare,
-	.commit = mga_encoder_commit,
-};
-
-static const struct drm_encoder_funcs mga_encoder_encoder_funcs = {
-	.destroy = mga_encoder_destroy,
-};
-
-static struct drm_encoder *mga_encoder_init(struct drm_device *dev)
-{
-	struct drm_encoder *encoder;
-	struct mga_encoder *mga_encoder;
-
-	mga_encoder = kzalloc(sizeof(struct mga_encoder), GFP_KERNEL);
-	if (!mga_encoder)
-		return NULL;
-
-	encoder = &mga_encoder->base;
-	encoder->possible_crtcs = 0x1;
-
-	drm_encoder_init(dev, encoder, &mga_encoder_encoder_funcs,
-			 DRM_MODE_ENCODER_DAC, NULL);
-	drm_encoder_helper_add(encoder, &mga_encoder_helper_funcs);
-
-	return encoder;
-}
-
-
 static int mga_vga_get_modes(struct drm_connector *connector)
 {
 	struct mga_connector *mga_connector = to_mga_connector(connector);
@@ -1686,8 +1617,9 @@ static struct drm_connector *mga_vga_init(struct drm_device *dev)
 
 int mgag200_modeset_init(struct mga_device *mdev)
 {
-	struct drm_encoder *encoder;
+	struct drm_encoder *encoder = &mdev->encoder;
 	struct drm_connector *connector;
+	int ret;
 
 	mdev->mode_info.mode_config_initialized = true;
 
@@ -1698,11 +1630,14 @@ int mgag200_modeset_init(struct mga_device *mdev)
 
 	mga_crtc_init(mdev);
 
-	encoder = mga_encoder_init(mdev->dev);
-	if (!encoder) {
-		DRM_ERROR("mga_encoder_init failed\n");
-		return -1;
+	ret = drm_simple_encoder_init(mdev->dev, encoder,
+				      DRM_MODE_ENCODER_DAC);
+	if (ret) {
+		DRM_ERROR("drm_simple_encoder_init() failed, error %d\n",
+			  -ret);
+		return ret;
 	}
+	encoder->possible_crtcs = 0x1;
 
 	connector = mga_vga_init(mdev->dev);
 	if (!connector) {
-- 
2.25.0

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Re: [PATCH v3 3/4] drm/mgag200: Use simple encoder

[Sam Ravnborg]

On Tue, Feb 25, 2020 at 02:10:54PM +0100, Thomas Zimmermann wrote:
> The mgag200 driver uses an empty implementation for its encoder. Replace
> the code with the generic simple encoder.
> 
> v3:
> 	* init pre-allocated encoder with drm_simple_encoder_init()
> v2:
> 	* rebase onto new simple-encoder interface
> 
> Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
> ---
>  drivers/gpu/drm/mgag200/mgag200_drv.h  |  9 +--
>  drivers/gpu/drm/mgag200/mgag200_mode.c | 85 +++-----------------------
>  2 files changed, 12 insertions(+), 82 deletions(-)
> 
> diff --git a/drivers/gpu/drm/mgag200/mgag200_drv.h b/drivers/gpu/drm/mgag200/mgag200_drv.h
> index aa32aad222c2..9691252d6233 100644
> --- a/drivers/gpu/drm/mgag200/mgag200_drv.h
> +++ b/drivers/gpu/drm/mgag200/mgag200_drv.h
> @@ -95,7 +95,6 @@
>  #define MATROX_DPMS_CLEARED (-1)
>  
>  #define to_mga_crtc(x) container_of(x, struct mga_crtc, base)
> -#define to_mga_encoder(x) container_of(x, struct mga_encoder, base)
>  #define to_mga_connector(x) container_of(x, struct mga_connector, base)
>  
>  struct mga_crtc {
> @@ -110,12 +109,6 @@ struct mga_mode_info {
>  	struct mga_crtc *crtc;
>  };
>  
> -struct mga_encoder {
> -	struct drm_encoder base;
> -	int last_dpms;
> -};
> -
> -
>  struct mga_i2c_chan {
>  	struct i2c_adapter adapter;
>  	struct drm_device *dev;
> @@ -185,6 +178,8 @@ struct mga_device {
>  
>  	/* SE model number stored in reg 0x1e24 */
>  	u32 unique_rev_id;
> +
> +	struct drm_encoder encoder;
>  };
>  
>  static inline enum mga_type
> diff --git a/drivers/gpu/drm/mgag200/mgag200_mode.c b/drivers/gpu/drm/mgag200/mgag200_mode.c
> index 62a8e9ccb16d..efc9eaa6a4d4 100644
> --- a/drivers/gpu/drm/mgag200/mgag200_mode.c
> +++ b/drivers/gpu/drm/mgag200/mgag200_mode.c
> @@ -15,6 +15,7 @@
>  #include <drm/drm_fourcc.h>
>  #include <drm/drm_plane_helper.h>
>  #include <drm/drm_probe_helper.h>
> +#include <drm/drm_simple_kms_helper.h>
>  
>  #include "mgag200_drv.h"
>  
> @@ -1449,76 +1450,6 @@ static void mga_crtc_init(struct mga_device *mdev)
>  	drm_crtc_helper_add(&mga_crtc->base, &mga_helper_funcs);
>  }
>  
> -/*
> - * The encoder comes after the CRTC in the output pipeline, but before
> - * the connector. It's responsible for ensuring that the digital
> - * stream is appropriately converted into the output format. Setup is
> - * very simple in this case - all we have to do is inform qemu of the
> - * colour depth in order to ensure that it displays appropriately
> - */
> -
> -/*
> - * These functions are analagous to those in the CRTC code, but are intended
> - * to handle any encoder-specific limitations
> - */
> -static void mga_encoder_mode_set(struct drm_encoder *encoder,
> -				struct drm_display_mode *mode,
> -				struct drm_display_mode *adjusted_mode)
> -{
> -
> -}
> -
> -static void mga_encoder_dpms(struct drm_encoder *encoder, int state)
> -{
> -	return;
> -}
> -
> -static void mga_encoder_prepare(struct drm_encoder *encoder)
> -{
> -}
> -
> -static void mga_encoder_commit(struct drm_encoder *encoder)
> -{
> -}
> -
> -static void mga_encoder_destroy(struct drm_encoder *encoder)
> -{
> -	struct mga_encoder *mga_encoder = to_mga_encoder(encoder);
> -	drm_encoder_cleanup(encoder);
> -	kfree(mga_encoder);
> -}
> -
> -static const struct drm_encoder_helper_funcs mga_encoder_helper_funcs = {
> -	.dpms = mga_encoder_dpms,
> -	.mode_set = mga_encoder_mode_set,
> -	.prepare = mga_encoder_prepare,
> -	.commit = mga_encoder_commit,
> -};
> -
> -static const struct drm_encoder_funcs mga_encoder_encoder_funcs = {
> -	.destroy = mga_encoder_destroy,
> -};
> -
> -static struct drm_encoder *mga_encoder_init(struct drm_device *dev)
> -{
> -	struct drm_encoder *encoder;
> -	struct mga_encoder *mga_encoder;
> -
> -	mga_encoder = kzalloc(sizeof(struct mga_encoder), GFP_KERNEL);
> -	if (!mga_encoder)
> -		return NULL;
> -
> -	encoder = &mga_encoder->base;
> -	encoder->possible_crtcs = 0x1;
> -
> -	drm_encoder_init(dev, encoder, &mga_encoder_encoder_funcs,
> -			 DRM_MODE_ENCODER_DAC, NULL);
> -	drm_encoder_helper_add(encoder, &mga_encoder_helper_funcs);
> -
> -	return encoder;
> -}
> -
> -
>  static int mga_vga_get_modes(struct drm_connector *connector)
>  {
>  	struct mga_connector *mga_connector = to_mga_connector(connector);
> @@ -1686,8 +1617,9 @@ static struct drm_connector *mga_vga_init(struct drm_device *dev)
>  
>  int mgag200_modeset_init(struct mga_device *mdev)
>  {
> -	struct drm_encoder *encoder;
> +	struct drm_encoder *encoder = &mdev->encoder;
>  	struct drm_connector *connector;
> +	int ret;
>  
>  	mdev->mode_info.mode_config_initialized = true;
>  
> @@ -1698,11 +1630,14 @@ int mgag200_modeset_init(struct mga_device *mdev)
>  
>  	mga_crtc_init(mdev);
>  
> -	encoder = mga_encoder_init(mdev->dev);
> -	if (!encoder) {
> -		DRM_ERROR("mga_encoder_init failed\n");
> -		return -1;
> +	ret = drm_simple_encoder_init(mdev->dev, encoder,
> +				      DRM_MODE_ENCODER_DAC);
> +	if (ret) {
> +		DRM_ERROR("drm_simple_encoder_init() failed, error %d\n",
> +			  -ret);
DRM_ERROR is deprecated if you have a drm_device.
Consider to use:

		drm_err(mdev->dev, "drm_simple_encoder_init() failed, error %d\n",
		        ret);
Note - "-ret" looked strange. We usually do not modify return values
like this when printing.


> +		return ret;
>  	}
> +	encoder->possible_crtcs = 0x1;
>  
>  	connector = mga_vga_init(mdev->dev);
>  	if (!connector) {

With the above addressed:
Reviewed-by: Sam Ravnborg <sam@ravnborg.org>


	Sam
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[PATCH v3 4/4] drm/qxl: Use simple encoder

[Thomas Zimmermann]

The qxl driver uses an empty implementation for its encoder. Replace
the code with the generic simple encoder.

v2:
	* rebase onto new simple-encoder interface

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Acked-by: Sam Ravnborg <sam@ravnborg.org>
Acked-by: Gerd Hoffmann <kraxel@redhat.com>
---
 drivers/gpu/drm/qxl/qxl_display.c | 18 +++---------------
 1 file changed, 3 insertions(+), 15 deletions(-)

diff --git a/drivers/gpu/drm/qxl/qxl_display.c b/drivers/gpu/drm/qxl/qxl_display.c
index ab4f8dd00400..9c0e1add59fb 100644
--- a/drivers/gpu/drm/qxl/qxl_display.c
+++ b/drivers/gpu/drm/qxl/qxl_display.c
@@ -31,6 +31,7 @@
 #include <drm/drm_gem_framebuffer_helper.h>
 #include <drm/drm_plane_helper.h>
 #include <drm/drm_probe_helper.h>
+#include <drm/drm_simple_kms_helper.h>
 
 #include "qxl_drv.h"
 #include "qxl_object.h"
@@ -1007,9 +1008,6 @@ static struct drm_encoder *qxl_best_encoder(struct drm_connector *connector)
 	return &qxl_output->enc;
 }
 
-static const struct drm_encoder_helper_funcs qxl_enc_helper_funcs = {
-};
-
 static const struct drm_connector_helper_funcs qxl_connector_helper_funcs = {
 	.get_modes = qxl_conn_get_modes,
 	.mode_valid = qxl_conn_mode_valid,
@@ -1059,15 +1057,6 @@ static const struct drm_connector_funcs qxl_connector_funcs = {
 	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
 };
 
-static void qxl_enc_destroy(struct drm_encoder *encoder)
-{
-	drm_encoder_cleanup(encoder);
-}
-
-static const struct drm_encoder_funcs qxl_enc_funcs = {
-	.destroy = qxl_enc_destroy,
-};
-
 static int qxl_mode_create_hotplug_mode_update_property(struct qxl_device *qdev)
 {
 	if (qdev->hotplug_mode_update_property)
@@ -1098,15 +1087,14 @@ static int qdev_output_init(struct drm_device *dev, int num_output)
 	drm_connector_init(dev, &qxl_output->base,
 			   &qxl_connector_funcs, DRM_MODE_CONNECTOR_VIRTUAL);
 
-	drm_encoder_init(dev, &qxl_output->enc, &qxl_enc_funcs,
-			 DRM_MODE_ENCODER_VIRTUAL, NULL);
+	drm_simple_encoder_init(dev, &qxl_output->enc,
+				DRM_MODE_ENCODER_VIRTUAL);
 
 	/* we get HPD via client monitors config */
 	connector->polled = DRM_CONNECTOR_POLL_HPD;
 	encoder->possible_crtcs = 1 << num_output;
 	drm_connector_attach_encoder(&qxl_output->base,
 					  &qxl_output->enc);
-	drm_encoder_helper_add(encoder, &qxl_enc_helper_funcs);
 	drm_connector_helper_add(connector, &qxl_connector_helper_funcs);
 
 	drm_object_attach_property(&connector->base,
-- 
2.25.0

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Re: [PATCH v3 4/4] drm/qxl: Use simple encoder

[Sam Ravnborg]

Hi Thomas.

On Tue, Feb 25, 2020 at 02:10:55PM +0100, Thomas Zimmermann wrote:
> The qxl driver uses an empty implementation for its encoder. Replace
> the code with the generic simple encoder.
> 
> v2:
> 	* rebase onto new simple-encoder interface
> 
> Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
> Acked-by: Sam Ravnborg <sam@ravnborg.org>
> Acked-by: Gerd Hoffmann <kraxel@redhat.com>
> ---
>  drivers/gpu/drm/qxl/qxl_display.c | 18 +++---------------
>  1 file changed, 3 insertions(+), 15 deletions(-)
> 
> diff --git a/drivers/gpu/drm/qxl/qxl_display.c b/drivers/gpu/drm/qxl/qxl_display.c
> index ab4f8dd00400..9c0e1add59fb 100644
> --- a/drivers/gpu/drm/qxl/qxl_display.c
> +++ b/drivers/gpu/drm/qxl/qxl_display.c
> @@ -31,6 +31,7 @@
>  #include <drm/drm_gem_framebuffer_helper.h>
>  #include <drm/drm_plane_helper.h>
>  #include <drm/drm_probe_helper.h>
> +#include <drm/drm_simple_kms_helper.h>
>  
>  #include "qxl_drv.h"
>  #include "qxl_object.h"
> @@ -1007,9 +1008,6 @@ static struct drm_encoder *qxl_best_encoder(struct drm_connector *connector)
>  	return &qxl_output->enc;
>  }
>  
> -static const struct drm_encoder_helper_funcs qxl_enc_helper_funcs = {
> -};
> -
>  static const struct drm_connector_helper_funcs qxl_connector_helper_funcs = {
>  	.get_modes = qxl_conn_get_modes,
>  	.mode_valid = qxl_conn_mode_valid,
> @@ -1059,15 +1057,6 @@ static const struct drm_connector_funcs qxl_connector_funcs = {
>  	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
>  };
>  
> -static void qxl_enc_destroy(struct drm_encoder *encoder)
> -{
> -	drm_encoder_cleanup(encoder);
> -}
> -
> -static const struct drm_encoder_funcs qxl_enc_funcs = {
> -	.destroy = qxl_enc_destroy,
> -};
> -
>  static int qxl_mode_create_hotplug_mode_update_property(struct qxl_device *qdev)
>  {
>  	if (qdev->hotplug_mode_update_property)
> @@ -1098,15 +1087,14 @@ static int qdev_output_init(struct drm_device *dev, int num_output)
>  	drm_connector_init(dev, &qxl_output->base,
>  			   &qxl_connector_funcs, DRM_MODE_CONNECTOR_VIRTUAL);
>  
> -	drm_encoder_init(dev, &qxl_output->enc, &qxl_enc_funcs,
> -			 DRM_MODE_ENCODER_VIRTUAL, NULL);
> +	drm_simple_encoder_init(dev, &qxl_output->enc,
> +				DRM_MODE_ENCODER_VIRTUAL);
return value is ignored - as it was before.
A quick grep told that it is 50/50 if return value is checked.
So OK.

Reviewed-by: Sam Ravnborg <sam@ravnborg.org>
>  
>  	/* we get HPD via client monitors config */
>  	connector->polled = DRM_CONNECTOR_POLL_HPD;
>  	encoder->possible_crtcs = 1 << num_output;
>  	drm_connector_attach_encoder(&qxl_output->base,
>  					  &qxl_output->enc);
> -	drm_encoder_helper_add(encoder, &qxl_enc_helper_funcs);
>  	drm_connector_helper_add(connector, &qxl_connector_helper_funcs);
>  
>  	drm_object_attach_property(&connector->base,
> -- 
> 2.25.0
> 
> _______________________________________________
> dri-devel mailing list
> dri-devel@lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/dri-devel
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Re: [PATCH v3 4/4] drm/qxl: Use simple encoder

[Thomas Zimmermann]

[-- Attachment #1.1.1: Type: text/plain, Size: 3898 bytes --]

Hi Sam

Am 27.02.20 um 21:45 schrieb Sam Ravnborg:
> Hi Thomas.
> 
> On Tue, Feb 25, 2020 at 02:10:55PM +0100, Thomas Zimmermann wrote:
>> The qxl driver uses an empty implementation for its encoder. Replace
>> the code with the generic simple encoder.
>>
>> v2:
>> 	* rebase onto new simple-encoder interface
>>
>> Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
>> Acked-by: Sam Ravnborg <sam@ravnborg.org>
>> Acked-by: Gerd Hoffmann <kraxel@redhat.com>
>> ---
>>  drivers/gpu/drm/qxl/qxl_display.c | 18 +++---------------
>>  1 file changed, 3 insertions(+), 15 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/qxl/qxl_display.c b/drivers/gpu/drm/qxl/qxl_display.c
>> index ab4f8dd00400..9c0e1add59fb 100644
>> --- a/drivers/gpu/drm/qxl/qxl_display.c
>> +++ b/drivers/gpu/drm/qxl/qxl_display.c
>> @@ -31,6 +31,7 @@
>>  #include <drm/drm_gem_framebuffer_helper.h>
>>  #include <drm/drm_plane_helper.h>
>>  #include <drm/drm_probe_helper.h>
>> +#include <drm/drm_simple_kms_helper.h>
>>  
>>  #include "qxl_drv.h"
>>  #include "qxl_object.h"
>> @@ -1007,9 +1008,6 @@ static struct drm_encoder *qxl_best_encoder(struct drm_connector *connector)
>>  	return &qxl_output->enc;
>>  }
>>  
>> -static const struct drm_encoder_helper_funcs qxl_enc_helper_funcs = {
>> -};
>> -
>>  static const struct drm_connector_helper_funcs qxl_connector_helper_funcs = {
>>  	.get_modes = qxl_conn_get_modes,
>>  	.mode_valid = qxl_conn_mode_valid,
>> @@ -1059,15 +1057,6 @@ static const struct drm_connector_funcs qxl_connector_funcs = {
>>  	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
>>  };
>>  
>> -static void qxl_enc_destroy(struct drm_encoder *encoder)
>> -{
>> -	drm_encoder_cleanup(encoder);
>> -}
>> -
>> -static const struct drm_encoder_funcs qxl_enc_funcs = {
>> -	.destroy = qxl_enc_destroy,
>> -};
>> -
>>  static int qxl_mode_create_hotplug_mode_update_property(struct qxl_device *qdev)
>>  {
>>  	if (qdev->hotplug_mode_update_property)
>> @@ -1098,15 +1087,14 @@ static int qdev_output_init(struct drm_device *dev, int num_output)
>>  	drm_connector_init(dev, &qxl_output->base,
>>  			   &qxl_connector_funcs, DRM_MODE_CONNECTOR_VIRTUAL);
>>  
>> -	drm_encoder_init(dev, &qxl_output->enc, &qxl_enc_funcs,
>> -			 DRM_MODE_ENCODER_VIRTUAL, NULL);
>> +	drm_simple_encoder_init(dev, &qxl_output->enc,
>> +				DRM_MODE_ENCODER_VIRTUAL);
> return value is ignored - as it was before.
> A quick grep told that it is 50/50 if return value is checked.
> So OK.

Well, now that you bring it up, I rather test for the returned value.
Continuing without an initialized encoder doesn't seem to make much sense.

Thanks for reviewing the patchset. I'll address the comments you had and
post another update before merging.

Best regards
Thomas

> 
> Reviewed-by: Sam Ravnborg <sam@ravnborg.org>
>>  
>>  	/* we get HPD via client monitors config */
>>  	connector->polled = DRM_CONNECTOR_POLL_HPD;
>>  	encoder->possible_crtcs = 1 << num_output;
>>  	drm_connector_attach_encoder(&qxl_output->base,
>>  					  &qxl_output->enc);
>> -	drm_encoder_helper_add(encoder, &qxl_enc_helper_funcs);
>>  	drm_connector_helper_add(connector, &qxl_connector_helper_funcs);
>>  
>>  	drm_object_attach_property(&connector->base,
>> -- 
>> 2.25.0
>>
>> _______________________________________________
>> dri-devel mailing list
>> dri-devel@lists.freedesktop.org
>> https://lists.freedesktop.org/mailman/listinfo/dri-devel
> _______________________________________________
> dri-devel mailing list
> dri-devel@lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/dri-devel
> 

-- 
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Maxfeldstr. 5, 90409 Nürnberg, Germany
(HRB 36809, AG Nürnberg)
Geschäftsführer: Felix Imendörffer


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