drm/msm/dsi: add mode valid callback for dsi_mgr

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

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Reviewed-by: Abhinav Kumar <quic_abhinavk@quicinc.com>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Patchwork: https://patchwork.freedesktop.org/patch/480930/
Link: https://lore.kernel.org/r/20220406094031.1027376-13-vkoul@kernel.org
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>

drivers/gpu/drm/msm/dsi/dsi.h

@@ -114,6 +114,8 @@ 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);

drivers/gpu/drm/msm/dsi/dsi_host.c

@@ -2554,6 +2554,32 @@ 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);

drivers/gpu/drm/msm/dsi/dsi_manager.c

@@ -573,6 +573,17 @@ static void dsi_mgr_bridge_mode_set(struct drm_bridge *bridge,
 	dsi_mgr_bridge_power_on(bridge);
 }
 
+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,
@@ -593,6 +604,7 @@ 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 */