From: Gaurav K Singh <gaurav.k.singh@xxxxxxxxx>
Before sending TURN ON packet,check the DPI
FIFO empty status.
v2: Change in commit message
Checking for FIFO empty only during TURN ON packet.
Signed-off-by: Gaurav K Singh <gaurav.k.singh@xxxxxxxxx>
Signed-off-by: Deepak M <m.deepak@xxxxxxxxx>
---
Got to know about the patch where they are removing this
DPI FIFO empty check while sending the SHUTDOWN packet.
http://lists.freedesktop.org/archives/intel-gfx/2014-July/048401.html
According added the check and waiting for DPI FIFIO empty
only when TURN_ON packet is sent.
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..495056f 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 ((cmd & TURN_ON) && 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
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