drm/msm: add support to take dsi, dp and dpu snapshot

Add support to take the register snapshot of dsi, dp and dpu
modules.
Signed-off-by: Abhinav Kumar <abhinavk@codeaurora.org>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Link: https://lore.kernel.org/r/1618606645-19695-7-git-send-email-abhinavk@codeaurora.orgSigned-off-by: Rob Clark <robdclark@chromium.org>

drivers/gpu/drm/msm/disp/msm_disp_snapshot.h

@@ -27,6 +27,7 @@
 #include <linux/devcoredump.h>
 #include <stdarg.h>
 #include "msm_kms.h"
+#include "dsi.h"
 
 #define MSM_DISP_SNAPSHOT_MAX_BLKS		10
 

drivers/gpu/drm/msm/disp/msm_disp_snapshot_util.c

@@ -130,9 +130,25 @@ void msm_disp_snapshot_capture_state(struct msm_disp_state *disp_state)
 {
 	struct msm_drm_private *priv;
 	struct drm_device *drm_dev;
+	struct msm_kms *kms;
+	int i;
 
 	drm_dev = disp_state->drm_dev;
 	priv = drm_dev->dev_private;
+	kms = priv->kms;
+
+	if (priv->dp)
+		msm_dp_snapshot(priv->dp);
+
+	for (i = 0; i < ARRAY_SIZE(priv->dsi); i++) {
+		if (!priv->dsi[i])
+			continue;
+
+		msm_dsi_snapshot(priv->dsi[i]);
+	}
+
+	if (kms->funcs->snapshot)
+		kms->funcs->snapshot(kms);
 
 	msm_disp_capture_atomic_state(disp_state);
 }