[Intel-gfx] [PATCH 10/10] drm/rcar-du/crc: Implement get_crc_sources callback

[Mahesh Kumar]

This patch implements get_crc_sources callback, which returns list of
all the crc sources supported by driver in current platform.

Signed-off-by: Mahesh Kumar <mahesh1.kumar at intel.com>
Cc: Laurent Pinchart <laurent.pinchart at ideasonboard.com>
---
 drivers/gpu/drm/rcar-du/rcar_du_crtc.c | 11 ++++++
 drivers/gpu/drm/rcar-du/rcar_du_drv.c  |  2 +
 drivers/gpu/drm/rcar-du/rcar_du_drv.h  |  2 +
 drivers/gpu/drm/rcar-du/rcar_du_kms.c  | 67 ++++++++++++++++++++++++++++++++++
 drivers/gpu/drm/rcar-du/rcar_du_kms.h  |  1 +
 5 files changed, 83 insertions(+)

diff --git a/drivers/gpu/drm/rcar-du/rcar_du_crtc.c b/drivers/gpu/drm/rcar-du/rcar_du_crtc.c
index 72db1834dd50..8da064daf9c9 100644
--- a/drivers/gpu/drm/rcar-du/rcar_du_crtc.c
+++ b/drivers/gpu/drm/rcar-du/rcar_du_crtc.c
@@ -807,6 +807,16 @@ static int rcar_du_crtc_verify_crc_source(struct drm_crtc *crtc,
 	return 0;
 }
 
+const char *const *rcar_du_crtc_get_crc_sources(struct drm_crtc *crtc,
+						size_t *count)
+{
+	struct rcar_du_crtc *rcrtc = to_rcar_crtc(crtc);
+	struct rcar_du_device *rcdu = rcrtc->group->dev;
+
+	*count = rcdu->sources_count;
+	return (const char * const*)rcdu->sources;
+}
+
 static int rcar_du_crtc_set_crc_source(struct drm_crtc *crtc,
 				       const char *source_name)
 {
@@ -898,6 +908,7 @@ static const struct drm_crtc_funcs crtc_funcs_gen3 = {
 	.disable_vblank = rcar_du_crtc_disable_vblank,
 	.set_crc_source = rcar_du_crtc_set_crc_source,
 	.verify_crc_source = rcar_du_crtc_verify_crc_source,
+	.get_crc_sources = rcar_du_crtc_get_crc_sources,
 };
 
 /* -----------------------------------------------------------------------------
diff --git a/drivers/gpu/drm/rcar-du/rcar_du_drv.c b/drivers/gpu/drm/rcar-du/rcar_du_drv.c
index 02aee6cb0e53..b2c9b7e862d5 100644
--- a/drivers/gpu/drm/rcar-du/rcar_du_drv.c
+++ b/drivers/gpu/drm/rcar-du/rcar_du_drv.c
@@ -401,6 +401,8 @@ static int rcar_du_remove(struct platform_device *pdev)
 
 	drm_dev_unregister(ddev);
 
+	rcar_du_crc_sources_list_uninit(rcdu);
+
 	if (rcdu->fbdev)
 		drm_fbdev_cma_fini(rcdu->fbdev);
 
diff --git a/drivers/gpu/drm/rcar-du/rcar_du_drv.h b/drivers/gpu/drm/rcar-du/rcar_du_drv.h
index b3a25e8e07d0..fe0e2ec724b5 100644
--- a/drivers/gpu/drm/rcar-du/rcar_du_drv.h
+++ b/drivers/gpu/drm/rcar-du/rcar_du_drv.h
@@ -92,6 +92,8 @@ struct rcar_du_device {
 
 	unsigned int dpad0_source;
 	unsigned int vspd1_sink;
+	char **sources;
+	size_t sources_count;
 };
 
 static inline bool rcar_du_has(struct rcar_du_device *rcdu,
diff --git a/drivers/gpu/drm/rcar-du/rcar_du_kms.c b/drivers/gpu/drm/rcar-du/rcar_du_kms.c
index f0bc7cc0e913..c74ced480c74 100644
--- a/drivers/gpu/drm/rcar-du/rcar_du_kms.c
+++ b/drivers/gpu/drm/rcar-du/rcar_du_kms.c
@@ -421,6 +421,70 @@ static int rcar_du_properties_init(struct rcar_du_device *rcdu)
 	return 0;
 }
 
+static void rcar_du_crc_sources_list_init(struct rcar_du_device *rcdu)
+{
+	struct drm_device *dev = rcdu->ddev;
+	struct drm_plane *plane;
+	char **sources;
+	size_t count;
+	int i = 0;
+
+	/* reserve 1 for "auto" source */
+	count = 1;
+
+	drm_for_each_plane(plane, dev)
+		count++;
+
+	sources = kmalloc_array(count, sizeof(char *), GFP_KERNEL);
+	if (!sources)
+		goto fail;
+
+	sources[i] = kstrdup("auto", GFP_KERNEL);
+	if (!sources[i])
+		goto fail_no_mem;
+
+	i++;
+	drm_for_each_plane(plane, dev) {
+		char name[16];
+
+		sprintf(name, "plane%d", plane->base.id);
+		sources[i] = kstrdup(name, GFP_KERNEL);
+		if (!sources[i])
+			goto fail_no_mem;
+		i++;
+	}
+
+	rcdu->sources = sources;
+	rcdu->sources_count = count;
+	return;
+
+fail_no_mem:
+	while (i > 0) {
+		i--;
+		kfree(sources[i]);
+	}
+	kfree(sources);
+fail:
+	rcdu->sources = NULL;
+	rcdu->sources_count = 0;
+}
+
+void rcar_du_crc_sources_list_uninit(struct rcar_du_device *rcdu)
+{
+	int i = rcdu->sources_count;
+
+	if (!rcdu->sources)
+		return;
+
+	while (i > 0) {
+		i--;
+		kfree(rcdu->sources[i]);
+	}
+	kfree(rcdu->sources);
+	rcdu->sources = NULL;
+	rcdu->sources_count = 0;
+}
+
 static int rcar_du_vsps_init(struct rcar_du_device *rcdu)
 {
 	const struct device_node *np = rcdu->dev->of_node;
@@ -591,6 +655,9 @@ int rcar_du_modeset_init(struct rcar_du_device *rcdu)
 			return ret;
 	}
 
+	/* Initialize CRC-sources list */
+	rcar_du_crc_sources_list_init(rcdu);
+
 	/* Initialize the encoders. */
 	ret = rcar_du_encoders_init(rcdu);
 	if (ret < 0)
diff --git a/drivers/gpu/drm/rcar-du/rcar_du_kms.h b/drivers/gpu/drm/rcar-du/rcar_du_kms.h
index 07951d5fe38b..29120e6b5666 100644
--- a/drivers/gpu/drm/rcar-du/rcar_du_kms.h
+++ b/drivers/gpu/drm/rcar-du/rcar_du_kms.h
@@ -32,6 +32,7 @@ struct rcar_du_format_info {
 const struct rcar_du_format_info *rcar_du_format_info(u32 fourcc);
 
 int rcar_du_modeset_init(struct rcar_du_device *rcdu);
+void rcar_du_crc_sources_list_uninit(struct rcar_du_device *rcdu);
 
 int rcar_du_dumb_create(struct drm_file *file, struct drm_device *dev,
 			struct drm_mode_create_dumb *args);
-- 
2.16.2