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Message-Id: <20250811092707.3986802-2-suraj.kandpal@intel.com>
Date: Mon, 11 Aug 2025 14:57:00 +0530
From: Suraj Kandpal <suraj.kandpal@...el.com>
To: kernel-list@...pberrypi.com,
amd-gfx@...ts.freedesktop.org,
linux-kernel@...r.kernel.org,
linux-renesas-soc@...r.kernel.org,
linux-arm-msm@...r.kernel.org,
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dri-devel@...ts.freedesktop.org,
intel-xe@...ts.freedesktop.org,
intel-gfx@...ts.freedesktop.org
Cc: ankit.k.nautiyal@...el.com,
arun.r.murthy@...el.com,
uma.shankar@...el.com,
jani.nikula@...el.com,
dmitry.baryshkov@....qualcomm.com,
harry.wentland@....com,
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alexander.deucher@....com,
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mcanal@...lia.com,
dave.stevenson@...pberrypi.com,
tomi.valkeinen+renesas@...asonboard.com,
kieran.bingham+renesas@...asonboard.com,
louis.chauvet@...tlin.com,
Suraj Kandpal <suraj.kandpal@...el.com>
Subject: [RFC PATCH 1/8] drm: writeback: Refactor drm_writeback_connector structure
Some drivers cannot work with the current design where the connector
is embedded within the drm_writeback_connector such as intel and
some drivers that can get it working end up adding a lot of checks
all around the code to check if it's a writeback conenctor or not.
To solve this we move the drm_writeback_connector within the
drm_connector and remove the drm_connector base which was in
drm_writeback_connector. We do all other required
modifications that come with these changes along with addition
of new function which returns the drm_connector when
drm_writeback_connector is present.
All drivers will be expected to allocate the drm_connector.
Signed-off-by: Suraj Kandpal <suraj.kandpal@...el.com>
---
drivers/gpu/drm/drm_writeback.c | 33 ++++++++++------
include/drm/drm_connector.h | 60 +++++++++++++++++++++++++++++
include/drm/drm_writeback.h | 68 ++++-----------------------------
3 files changed, 89 insertions(+), 72 deletions(-)
diff --git a/drivers/gpu/drm/drm_writeback.c b/drivers/gpu/drm/drm_writeback.c
index ec2575c4c21b..198b8c488056 100644
--- a/drivers/gpu/drm/drm_writeback.c
+++ b/drivers/gpu/drm/drm_writeback.c
@@ -89,8 +89,10 @@ static const char *drm_writeback_fence_get_driver_name(struct dma_fence *fence)
{
struct drm_writeback_connector *wb_connector =
fence_to_wb_connector(fence);
+ struct drm_connector *connector =
+ drm_writeback_to_connector(wb_connector);
- return wb_connector->base.dev->driver->name;
+ return connector->dev->driver->name;
}
static const char *
@@ -187,7 +189,8 @@ static int __drm_writeback_connector_init(struct drm_device *dev,
struct drm_encoder *enc, const u32 *formats,
int n_formats)
{
- struct drm_connector *connector = &wb_connector->base;
+ struct drm_connector *connector =
+ drm_writeback_to_connector(wb_connector);
struct drm_mode_config *config = &dev->mode_config;
struct drm_property_blob *blob;
int ret = create_writeback_properties(dev);
@@ -269,7 +272,8 @@ int drm_writeback_connector_init(struct drm_device *dev,
struct drm_encoder *enc,
const u32 *formats, int n_formats)
{
- struct drm_connector *connector = &wb_connector->base;
+ struct drm_connector *connector =
+ drm_writeback_to_connector(wb_connector);
int ret;
ret = drm_connector_init(dev, connector, con_funcs,
@@ -339,7 +343,8 @@ int drmm_writeback_connector_init(struct drm_device *dev,
struct drm_encoder *enc,
const u32 *formats, int n_formats)
{
- struct drm_connector *connector = &wb_connector->base;
+ struct drm_connector *connector =
+ drm_writeback_to_connector(wb_connector);
int ret;
ret = drmm_connector_init(dev, connector, con_funcs,
@@ -382,13 +387,15 @@ int drm_writeback_set_fb(struct drm_connector_state *conn_state,
int drm_writeback_prepare_job(struct drm_writeback_job *job)
{
- struct drm_writeback_connector *connector = job->connector;
+ struct drm_writeback_connector *wb_connector = job->connector;
+ struct drm_connector *connector
+ = drm_writeback_to_connector(wb_connector);
const struct drm_connector_helper_funcs *funcs =
- connector->base.helper_private;
+ connector->helper_private;
int ret;
if (funcs->prepare_writeback_job) {
- ret = funcs->prepare_writeback_job(connector, job);
+ ret = funcs->prepare_writeback_job(wb_connector, job);
if (ret < 0)
return ret;
}
@@ -434,12 +441,14 @@ EXPORT_SYMBOL(drm_writeback_queue_job);
void drm_writeback_cleanup_job(struct drm_writeback_job *job)
{
- struct drm_writeback_connector *connector = job->connector;
+ struct drm_writeback_connector *wb_connector = job->connector;
+ struct drm_connector *connector
+ = drm_writeback_to_connector(wb_connector);
const struct drm_connector_helper_funcs *funcs =
- connector->base.helper_private;
+ connector->helper_private;
if (job->prepared && funcs->cleanup_writeback_job)
- funcs->cleanup_writeback_job(connector, job);
+ funcs->cleanup_writeback_job(wb_connector, job);
if (job->fb)
drm_framebuffer_put(job->fb);
@@ -521,8 +530,10 @@ struct dma_fence *
drm_writeback_get_out_fence(struct drm_writeback_connector *wb_connector)
{
struct dma_fence *fence;
+ struct drm_connector *connector =
+ drm_writeback_to_connector(wb_connector);
- if (WARN_ON(wb_connector->base.connector_type !=
+ if (WARN_ON(connector->connector_type !=
DRM_MODE_CONNECTOR_WRITEBACK))
return NULL;
diff --git a/include/drm/drm_connector.h b/include/drm/drm_connector.h
index 8f34f4b8183d..da63fdafd9f2 100644
--- a/include/drm/drm_connector.h
+++ b/include/drm/drm_connector.h
@@ -1882,6 +1882,61 @@ struct drm_connector_cec {
void *data;
};
+/**
+ * struct drm_writeback_connector - DRM writeback connector
+ */
+struct drm_writeback_connector {
+ /**
+ * @pixel_formats_blob_ptr:
+ *
+ * DRM blob property data for the pixel formats list on writeback
+ * connectors
+ * See also drm_writeback_connector_init()
+ */
+ struct drm_property_blob *pixel_formats_blob_ptr;
+
+ /** @job_lock: Protects job_queue */
+ spinlock_t job_lock;
+
+ /**
+ * @job_queue:
+ *
+ * Holds a list of a connector's writeback jobs; the last item is the
+ * most recent. The first item may be either waiting for the hardware
+ * to begin writing, or currently being written.
+ *
+ * See also: drm_writeback_queue_job() and
+ * drm_writeback_signal_completion()
+ */
+ struct list_head job_queue;
+
+ /**
+ * @fence_context:
+ *
+ * timeline context used for fence operations.
+ */
+ unsigned int fence_context;
+ /**
+ * @fence_lock:
+ *
+ * spinlock to protect the fences in the fence_context.
+ */
+ spinlock_t fence_lock;
+ /**
+ * @fence_seqno:
+ *
+ * Seqno variable used as monotonic counter for the fences
+ * created on the connector's timeline.
+ */
+ unsigned long fence_seqno;
+ /**
+ * @timeline_name:
+ *
+ * The name of the connector's fence timeline.
+ */
+ char timeline_name[32];
+};
+
/**
* struct drm_connector - central DRM connector control structure
*
@@ -2305,6 +2360,11 @@ struct drm_connector {
* @cec: CEC-related data.
*/
struct drm_connector_cec cec;
+
+ /**
+ * @writeback: Writeback related valriables.
+ */
+ struct drm_writeback_connector writeback;
};
#define obj_to_connector(x) container_of(x, struct drm_connector, base)
diff --git a/include/drm/drm_writeback.h b/include/drm/drm_writeback.h
index 958466a05e60..2a52b6761797 100644
--- a/include/drm/drm_writeback.h
+++ b/include/drm/drm_writeback.h
@@ -15,66 +15,6 @@
#include <drm/drm_encoder.h>
#include <linux/workqueue.h>
-/**
- * struct drm_writeback_connector - DRM writeback connector
- */
-struct drm_writeback_connector {
- /**
- * @base: base drm_connector object
- */
- struct drm_connector base;
-
- /**
- * @pixel_formats_blob_ptr:
- *
- * DRM blob property data for the pixel formats list on writeback
- * connectors
- * See also drm_writeback_connector_init()
- */
- struct drm_property_blob *pixel_formats_blob_ptr;
-
- /** @job_lock: Protects job_queue */
- spinlock_t job_lock;
-
- /**
- * @job_queue:
- *
- * Holds a list of a connector's writeback jobs; the last item is the
- * most recent. The first item may be either waiting for the hardware
- * to begin writing, or currently being written.
- *
- * See also: drm_writeback_queue_job() and
- * drm_writeback_signal_completion()
- */
- struct list_head job_queue;
-
- /**
- * @fence_context:
- *
- * timeline context used for fence operations.
- */
- unsigned int fence_context;
- /**
- * @fence_lock:
- *
- * spinlock to protect the fences in the fence_context.
- */
- spinlock_t fence_lock;
- /**
- * @fence_seqno:
- *
- * Seqno variable used as monotonic counter for the fences
- * created on the connector's timeline.
- */
- unsigned long fence_seqno;
- /**
- * @timeline_name:
- *
- * The name of the connector's fence timeline.
- */
- char timeline_name[32];
-};
-
/**
* struct drm_writeback_job - DRM writeback job
*/
@@ -131,10 +71,16 @@ struct drm_writeback_job {
void *priv;
};
+static inline struct drm_connector *
+drm_writeback_to_connector(struct drm_writeback_connector *wb_connector)
+{
+ return container_of(wb_connector, struct drm_connector, writeback);
+}
+
static inline struct drm_writeback_connector *
drm_connector_to_writeback(struct drm_connector *connector)
{
- return container_of(connector, struct drm_writeback_connector, base);
+ return &connector->writeback;
}
int drm_writeback_connector_init(struct drm_device *dev,
--
2.34.1
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