[PATCH 1/2] drm/i915/dsi: Send SHUTDOWN only for v3+ VBT's

Mika Kahola mika.kahola at intel.com
Thu Aug 31 12:04:29 UTC 2017

According to spec we should send SHUTDOWN before MIPI_SEQ_DISPLAY_OFF for
v3+ VBT's. Testing with VBT v3 the current implementation yields the
following error message

*ERROR* Video mode command 0x00000041 send failed.

To get rid of this error message, let's limit SHUTDOWN only for VBT
versions 3 or higher.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=102404
Signed-off-by: Mika Kahola <mika.kahola at intel.com>
 drivers/gpu/drm/i915/intel_dsi.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/intel_dsi.c b/drivers/gpu/drm/i915/intel_dsi.c
index 2a0f5d3..b48b9b7 100644
--- a/drivers/gpu/drm/i915/intel_dsi.c
+++ b/drivers/gpu/drm/i915/intel_dsi.c
@@ -916,7 +916,7 @@ static void intel_dsi_disable(struct intel_encoder *encoder,
 	 * MIPI_SEQ_DISPLAY_OFF only for v3+ VBTs, but field testing
 	 * has shown that the v3 sequence works for v2 VBTs too
-	if (is_vid_mode(intel_dsi)) {
+	if (is_vid_mode(intel_dsi) && dev_priv->vbt.dsi.seq_version > 3) {
 		/* Send Shutdown command to the panel in LP mode */
 		for_each_dsi_port(port, intel_dsi->ports)
 			dpi_send_cmd(intel_dsi, SHUTDOWN, false, port);

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