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.
v3: Adding a new function for DPI FIFO empty check
Signed-off-by: Gaurav K Singh <gaurav.k.singh@xxxxxxxxx>
Signed-off-by: Deepak M <m.deepak@xxxxxxxxx>
---
drivers/gpu/drm/i915/intel_dsi.c | 15 ++++++++++++++-
1 file changed, 14 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/i915/intel_dsi.c b/drivers/gpu/drm/i915/intel_dsi.c
index 170ae6f..eff982b 100644
--- a/drivers/gpu/drm/i915/intel_dsi.c
+++ b/drivers/gpu/drm/i915/intel_dsi.c
@@ -60,6 +60,17 @@ static void wait_for_dsi_fifo_empty(struct intel_dsi *intel_dsi, enum port port)
DRM_ERROR("DPI FIFOs are not empty\n");
}
+static void wait_for_dpi_fifo_empty(struct intel_dsi *intel_dsi, enum port port)
+{
+ struct drm_encoder *encoder = &intel_dsi->base.base;
+ struct drm_device *dev = encoder->dev;
+ struct drm_i915_private *dev_priv = dev->dev_private;
+
+ if (wait_for((I915_READ(MIPI_GEN_FIFO_STAT(port)) & DPI_FIFO_EMPTY)
+ == DPI_FIFO_EMPTY, 50))
+ DRM_ERROR("Timeout waiting for DPI FIFO empty\n");
+}
+
static void write_data(struct drm_i915_private *dev_priv, u32 reg,
const u8 *data, u32 len)
{
@@ -443,8 +454,10 @@ static void intel_dsi_enable(struct intel_encoder *encoder)
I915_WRITE(MIPI_MAX_RETURN_PKT_SIZE(port), 8 * 4);
} else {
msleep(20); /* XXX */
- for_each_dsi_port(port, intel_dsi->ports)
+ for_each_dsi_port(port, intel_dsi->ports) {
+ wait_for_dpi_fifo_empty(intel_dsi, port);
dpi_send_cmd(intel_dsi, TURN_ON, false, port);
+ }
msleep(100);
drm_panel_enable(intel_dsi->panel);
--
1.9.1
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