drm/i915: wait for all DSI FIFOs to be empty
Ensure that the DSI packets for a particular sequence are completely
sent before going ahead in the enabling or disabling of the panel
Signed-off-by: Shobhit Kumar <shobhit.kumar@intel.com>
Reviewed-by: Imre Deak <imre.deak@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
diff --git a/drivers/gpu/drm/i915/intel_dsi.c b/drivers/gpu/drm/i915/intel_dsi.c
index bfcefbf..09e1caf 100644
--- a/drivers/gpu/drm/i915/intel_dsi.c
+++ b/drivers/gpu/drm/i915/intel_dsi.c
@@ -152,6 +152,8 @@
if (intel_dsi->dev.dev_ops->enable)
intel_dsi->dev.dev_ops->enable(&intel_dsi->dev);
+ wait_for_dsi_fifo_empty(intel_dsi);
+
/* assert ip_tg_enable signal */
temp = I915_READ(MIPI_PORT_CTRL(pipe)) & ~LANE_CONFIGURATION_MASK;
temp = temp | intel_dsi->port_bits;
@@ -192,6 +194,8 @@
if (intel_dsi->dev.dev_ops->send_otp_cmds)
intel_dsi->dev.dev_ops->send_otp_cmds(&intel_dsi->dev);
+ wait_for_dsi_fifo_empty(intel_dsi);
+
/* Enable port in pre-enable phase itself because as per hw team
* recommendation, port should be enabled befor plane & pipe */
intel_dsi_enable(encoder);
@@ -232,6 +236,8 @@
DRM_DEBUG_KMS("\n");
if (is_vid_mode(intel_dsi)) {
+ wait_for_dsi_fifo_empty(intel_dsi);
+
/* de-assert ip_tg_enable signal */
temp = I915_READ(MIPI_PORT_CTRL(pipe));
I915_WRITE(MIPI_PORT_CTRL(pipe), temp & ~DPI_ENABLE);
@@ -261,6 +267,8 @@
* some next enable sequence send turn on packet error is observed */
if (intel_dsi->dev.dev_ops->disable)
intel_dsi->dev.dev_ops->disable(&intel_dsi->dev);
+
+ wait_for_dsi_fifo_empty(intel_dsi);
}
static void intel_dsi_clear_device_ready(struct intel_encoder *encoder)