[RESEND v6 3/9] drm: drm_atomic_helper: Add a new helper to deal with the writeback connector validation

[Igor Torrente <igormtorrente@xxxxxxxxx>]

Add a helper function to validate the connector configuration received in
the encoder atomic_check by the drivers.

So the drivers don't need to do these common validations themselves.

V2: Move the format verification to a new helper at the drm_atomic_helper.c
    (Thomas Zimmermann).
V3: Format check improvements (Leandro Ribeiro).
    Minor improvements(Thomas Zimmermann).
V5: Fix some grammar issues in the commit message (André Almeida).

Signed-off-by: Igor Torrente <igormtorrente@xxxxxxxxx>
---
 drivers/gpu/drm/drm_atomic_helper.c   | 39 +++++++++++++++++++++++++++
 drivers/gpu/drm/vkms/vkms_writeback.c |  9 +++----
 include/drm/drm_atomic_helper.h       |  3 +++
 3 files changed, 46 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/drm_atomic_helper.c b/drivers/gpu/drm/drm_atomic_helper.c
index 9603193d2fa1..2052e18fa64c 100644
--- a/drivers/gpu/drm/drm_atomic_helper.c
+++ b/drivers/gpu/drm/drm_atomic_helper.c
@@ -776,6 +776,45 @@ drm_atomic_helper_check_modeset(struct drm_device *dev,
 }
 EXPORT_SYMBOL(drm_atomic_helper_check_modeset);
 
+/**
+ * drm_atomic_helper_check_wb_connector_state() - Check writeback encoder state
+ * @encoder: encoder state to check
+ * @conn_state: connector state to check
+ *
+ * Checks if the writeback connector state is valid, and returns an error if it
+ * isn't.
+ *
+ * RETURNS:
+ * Zero for success or -errno
+ */
+int
+drm_atomic_helper_check_wb_encoder_state(struct drm_encoder *encoder,
+					 struct drm_connector_state *conn_state)
+{
+	struct drm_writeback_job *wb_job = conn_state->writeback_job;
+	struct drm_property_blob *pixel_format_blob;
+	struct drm_framebuffer *fb;
+	size_t i, nformats;
+	u32 *formats;
+
+	if (!wb_job || !wb_job->fb)
+		return 0;
+
+	pixel_format_blob = wb_job->connector->pixel_formats_blob_ptr;
+	nformats = pixel_format_blob->length / sizeof(u32);
+	formats = pixel_format_blob->data;
+	fb = wb_job->fb;
+
+	for (i = 0; i < nformats; i++)
+		if (fb->format->format == formats[i])
+			return 0;
+
+	drm_dbg_kms(encoder->dev, "Invalid pixel format %p4cc\n", &fb->format->format);
+
+	return -EINVAL;
+}
+EXPORT_SYMBOL(drm_atomic_helper_check_wb_encoder_state);
+
 /**
  * drm_atomic_helper_check_plane_state() - Check plane state for validity
  * @plane_state: plane state to check
diff --git a/drivers/gpu/drm/vkms/vkms_writeback.c b/drivers/gpu/drm/vkms/vkms_writeback.c
index af1604dfbbaf..250e509a298f 100644
--- a/drivers/gpu/drm/vkms/vkms_writeback.c
+++ b/drivers/gpu/drm/vkms/vkms_writeback.c
@@ -30,6 +30,7 @@ static int vkms_wb_encoder_atomic_check(struct drm_encoder *encoder,
 {
 	struct drm_framebuffer *fb;
 	const struct drm_display_mode *mode = &crtc_state->mode;
+	int ret;
 
 	if (!conn_state->writeback_job || !conn_state->writeback_job->fb)
 		return 0;
@@ -41,11 +42,9 @@ static int vkms_wb_encoder_atomic_check(struct drm_encoder *encoder,
 		return -EINVAL;
 	}
 
-	if (fb->format->format != vkms_wb_formats[0]) {
-		DRM_DEBUG_KMS("Invalid pixel format %p4cc\n",
-			      &fb->format->format);
-		return -EINVAL;
-	}
+	ret = drm_atomic_helper_check_wb_encoder_state(encoder, conn_state);
+	if (ret < 0)
+		return ret;
 
 	return 0;
 }
diff --git a/include/drm/drm_atomic_helper.h b/include/drm/drm_atomic_helper.h
index 4045e2507e11..3fbf695da60f 100644
--- a/include/drm/drm_atomic_helper.h
+++ b/include/drm/drm_atomic_helper.h
@@ -40,6 +40,9 @@ struct drm_private_state;
 
 int drm_atomic_helper_check_modeset(struct drm_device *dev,
 				struct drm_atomic_state *state);
+int
+drm_atomic_helper_check_wb_encoder_state(struct drm_encoder *encoder,
+					 struct drm_connector_state *conn_state);
 int drm_atomic_helper_check_plane_state(struct drm_plane_state *plane_state,
 					const struct drm_crtc_state *crtc_state,
 					int min_scale,
-- 
2.30.2