[Intel-gfx] [PATCH] drm/i915: Redoing the PSR setup on resume

[Ramalingam C]

Due to switch between console and graphics modes multiple psr_enable
call will be made. On such occasions, to avoid repeated psr_setup,
a flag called psr_setup_done is used.

On suspend-resume, panel goes for a power cycle. Hence PSR setup
should be redone to enable the PSR after suspend-resume.
So this patch resets the corresponding flag, if it is set during the
panel powerup process.

Signed-off-by: Ramalingam C <ramalingam.c at intel.com>
---
 drivers/gpu/drm/i915/intel_ddi.c |    5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_ddi.c b/drivers/gpu/drm/i915/intel_ddi.c
index 74749c6..686f8f6 100644
--- a/drivers/gpu/drm/i915/intel_ddi.c
+++ b/drivers/gpu/drm/i915/intel_ddi.c
@@ -1201,6 +1201,11 @@ static void intel_ddi_pre_enable(struct intel_encoder *intel_encoder)
 	if (type == INTEL_OUTPUT_EDP) {
 		struct intel_dp *intel_dp = enc_to_intel_dp(encoder);
 		ironlake_edp_panel_on(intel_dp);
+
+		/* Resetting the flag, to redo the PSR setup after
+		 * panel powercycle */
+		if (intel_dp->psr_setup_done)
+			intel_dp->psr_setup_done = false;
 	}
 
 	WARN_ON(intel_crtc->ddi_pll_sel == PORT_CLK_SEL_NONE);
-- 
1.7.9.5