drm: xlnx: zynqmp_dpsub: Don't access connector in zynqmp_dp_set_format()

To prepare for the removal of the connector from the DP encoder, pass
the display info pointer to the zynqmp_dp_set_format() function instead
of accessing the connector internally. The display info is NULL when the
function is called at initialization time, as we have no display info at
that point. This doesn't change the existing behaviour, given that the
zynqmp_dp_set_format() was already handling this as a special case (the
display info isn't initialized at init time and is all zeroes).
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

drivers/gpu/drm/xlnx/zynqmp_dp.c

@@ -1109,6 +1109,7 @@ static void zynqmp_dp_update_misc(struct zynqmp_dp *dp)
 /**
  * zynqmp_dp_set_format - Set the input format
  * @dp: DisplayPort IP core structure
+ * @info: Display info
  * @format: input format
  * @bpc: bits per component
  *
@@ -1117,10 +1118,10 @@ static void zynqmp_dp_update_misc(struct zynqmp_dp *dp)
  * Return: 0 on success, or -EINVAL.
  */
 static int zynqmp_dp_set_format(struct zynqmp_dp *dp,
+				const struct drm_display_info *info,
 				enum zynqmp_dpsub_format format,
 				unsigned int bpc)
 {
-	static const struct drm_display_info *display;
 	struct zynqmp_dp_config *config = &dp->config;
 	unsigned int num_colors;
 
@@ -1153,12 +1154,11 @@ static int zynqmp_dp_set_format(struct zynqmp_dp *dp,
 		return -EINVAL;
 	}
 
-	display = &dp->connector.display_info;
-	if (display->bpc && bpc > display->bpc) {
+	if (info && info->bpc && bpc > info->bpc) {
 		dev_warn(dp->dev,
 			 "downgrading requested %ubpc to display limit %ubpc\n",
-			 bpc, display->bpc);
-		bpc = display->bpc;
+			 bpc, info->bpc);
+		bpc = info->bpc;
 	}
 
 	config->misc0 &= ~ZYNQMP_DP_MAIN_STREAM_MISC0_BPC_MASK;
@@ -1353,7 +1353,8 @@ static void zynqmp_dp_bridge_atomic_enable(struct drm_bridge *bridge,
 	adjusted_mode = &crtc_state->adjusted_mode;
 	mode = &crtc_state->mode;
 
-	zynqmp_dp_set_format(dp, ZYNQMP_DPSUB_FORMAT_RGB, 8);
+	zynqmp_dp_set_format(dp, &connector->display_info,
+			     ZYNQMP_DPSUB_FORMAT_RGB, 8);
 
 	/* Check again as bpp or format might have been changed */
 	rate = zynqmp_dp_max_rate(dp->link_config.max_rate,
@@ -1714,7 +1715,7 @@ int zynqmp_dp_drm_init(struct zynqmp_dpsub *dpsub)
 	int ret;
 
 	dp->config.misc0 &= ~ZYNQMP_DP_MAIN_STREAM_MISC0_SYNC_LOCK;
-	zynqmp_dp_set_format(dp, ZYNQMP_DPSUB_FORMAT_RGB, 8);
+	zynqmp_dp_set_format(dp, NULL, ZYNQMP_DPSUB_FORMAT_RGB, 8);
 
 	/*
 	 * Initialize the bridge. Setting the device and encoder manually is a