[Intel-gfx] [PATCH 1/3] drm/i915: Add DPI FIFO empty status check

[Deepak M]

From: Gaurav K Singh <gaurav.k.singh at intel.com>

After sending SHUTDOWN or TURN ON packet,check the DPI
FIFO empty status.

Signed-off-by: Gaurav K Singh <gaurav.k.singh at intel.com>
---
 drivers/gpu/drm/i915/intel_dsi.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_dsi.c b/drivers/gpu/drm/i915/intel_dsi.c
index 170ae6f..5c5b59a 100644
--- a/drivers/gpu/drm/i915/intel_dsi.c
+++ b/drivers/gpu/drm/i915/intel_dsi.c
@@ -222,6 +222,12 @@ static int dpi_send_cmd(struct intel_dsi *intel_dsi, u32 cmd, bool hs,
 	else
 		cmd |= DPI_LP_MODE;
 
+	mask = DPI_FIFO_EMPTY;
+
+	if (wait_for((I915_READ(MIPI_GEN_FIFO_STAT(port)) & mask)
+							== mask, 50))
+		DRM_ERROR("Timeout waiting for DPI FIFO empty\n");
+
 	/* clear bit */
 	I915_WRITE(MIPI_INTR_STAT(port), SPL_PKT_SENT_INTERRUPT);
 
-- 
1.9.1