[PATCH v3 11/13] drm/msm/dsi: add mode valid callback for dsi_mgr

[Vinod Koul]

Add a mode valid callback for dsi_mgr for checking mode being valid in
case of DSC. For DSC the height and width needs to be multiple of slice,
so we check that here

Signed-off-by: Vinod Koul <vkoul at kernel.org>
---
 drivers/gpu/drm/msm/dsi/dsi.h         |  2 ++
 drivers/gpu/drm/msm/dsi/dsi_host.c    | 26 ++++++++++++++++++++++++++
 drivers/gpu/drm/msm/dsi/dsi_manager.c | 12 ++++++++++++
 3 files changed, 40 insertions(+)

diff --git a/drivers/gpu/drm/msm/dsi/dsi.h b/drivers/gpu/drm/msm/dsi/dsi.h
index 569c8ff062ba..e7affab2fc1e 100644
--- a/drivers/gpu/drm/msm/dsi/dsi.h
+++ b/drivers/gpu/drm/msm/dsi/dsi.h
@@ -115,6 +115,8 @@ int msm_dsi_host_power_on(struct mipi_dsi_host *host,
 int msm_dsi_host_power_off(struct mipi_dsi_host *host);
 int msm_dsi_host_set_display_mode(struct mipi_dsi_host *host,
 				  const struct drm_display_mode *mode);
+enum drm_mode_status msm_dsi_host_check_dsc(struct mipi_dsi_host *host,
+					    const struct drm_display_mode *mode);
 struct drm_panel *msm_dsi_host_get_panel(struct mipi_dsi_host *host);
 unsigned long msm_dsi_host_get_mode_flags(struct mipi_dsi_host *host);
 struct drm_bridge *msm_dsi_host_get_bridge(struct mipi_dsi_host *host);
diff --git a/drivers/gpu/drm/msm/dsi/dsi_host.c b/drivers/gpu/drm/msm/dsi/dsi_host.c
index 30c1e299aa52..31d385d8d834 100644
--- a/drivers/gpu/drm/msm/dsi/dsi_host.c
+++ b/drivers/gpu/drm/msm/dsi/dsi_host.c
@@ -2588,6 +2588,32 @@ int msm_dsi_host_set_display_mode(struct mipi_dsi_host *host,
 	return 0;
 }
 
+enum drm_mode_status msm_dsi_host_check_dsc(struct mipi_dsi_host *host,
+					    const struct drm_display_mode *mode)
+{
+	struct msm_dsi_host *msm_host = to_msm_dsi_host(host);
+	struct msm_display_dsc_config *dsc = msm_host->dsc;
+	int pic_width = mode->hdisplay;
+	int pic_height = mode->vdisplay;
+
+	if (!msm_host->dsc)
+		return MODE_OK;
+
+	if (pic_width % dsc->drm->slice_width) {
+		pr_err("DSI: pic_width %d has to be multiple of slice %d\n",
+		       pic_width, dsc->drm->slice_width);
+		return MODE_H_ILLEGAL;
+	}
+
+	if (pic_height % dsc->drm->slice_height) {
+		pr_err("DSI: pic_height %d has to be multiple of slice %d\n",
+		       pic_height, dsc->drm->slice_height);
+		return MODE_V_ILLEGAL;
+	}
+
+	return MODE_OK;
+}
+
 struct drm_panel *msm_dsi_host_get_panel(struct mipi_dsi_host *host)
 {
 	return of_drm_find_panel(to_msm_dsi_host(host)->device_node);
diff --git a/drivers/gpu/drm/msm/dsi/dsi_manager.c b/drivers/gpu/drm/msm/dsi/dsi_manager.c
index 20c4d650fd80..0ad8a53aaa0e 100644
--- a/drivers/gpu/drm/msm/dsi/dsi_manager.c
+++ b/drivers/gpu/drm/msm/dsi/dsi_manager.c
@@ -579,6 +579,17 @@ static void dsi_mgr_bridge_mode_set(struct drm_bridge *bridge,
 		msm_dsi_host_set_display_mode(other_dsi->host, adjusted_mode);
 }
 
+static enum drm_mode_status dsi_mgr_bridge_mode_valid(struct drm_bridge *bridge,
+						      const struct drm_display_info *info,
+						      const struct drm_display_mode *mode)
+{
+	int id = dsi_mgr_bridge_get_id(bridge);
+	struct msm_dsi *msm_dsi = dsi_mgr_get_dsi(id);
+	struct mipi_dsi_host *host = msm_dsi->host;
+
+	return msm_dsi_host_check_dsc(host, mode);
+}
+
 static const struct drm_connector_funcs dsi_mgr_connector_funcs = {
 	.detect = dsi_mgr_connector_detect,
 	.fill_modes = drm_helper_probe_single_connector_modes,
@@ -600,6 +611,7 @@ static const struct drm_bridge_funcs dsi_mgr_bridge_funcs = {
 	.disable = dsi_mgr_bridge_disable,
 	.post_disable = dsi_mgr_bridge_post_disable,
 	.mode_set = dsi_mgr_bridge_mode_set,
+	.mode_valid = dsi_mgr_bridge_mode_valid,
 };
 
 /* initialize connector when we're connected to a drm_panel */
-- 
2.31.1