linux-kernel - [PATCH 21/21] drm/i915: No need to wait for eDP power off delay if panel is on

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Message-Id: <1317344993-24945-22-git-send-email-keithp@keithp.com>
Date:	Thu, 29 Sep 2011 18:09:53 -0700
From:	Keith Packard <keithp@...thp.com>
To:	Dave Airlie <airlied@...hat.com>
Cc:	linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
	intel-gfx@...ts.freedesktop.org, Keith Packard <keithp@...thp.com>
Subject: [PATCH 21/21] drm/i915: No need to wait for eDP power off delay if panel is on

If the panel is powered up, there's no need to delay for the 'off'
interval when turning the panel on.

Signed-off-by: Keith Packard <keithp@...thp.com>
---
 drivers/gpu/drm/i915/intel_dp.c |    9 +++++++++
 1 files changed, 9 insertions(+), 0 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index f223504..a01cc2a 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -856,7 +856,16 @@ static void ironlake_wait_panel_off(struct intel_dp *intel_dp)
 {
 	unsigned long	off_time;
 	unsigned long	delay;
+
 	DRM_DEBUG_KMS("Wait for panel power off time\n");
+
+	if (ironlake_edp_have_panel_power(intel_dp) ||
+	    ironlake_edp_have_panel_vdd(intel_dp))
+	{
+		DRM_DEBUG_KMS("Panel still on, no delay needed\n");
+		return;
+	}
+
 	off_time = intel_dp->panel_off_jiffies + msecs_to_jiffies(intel_dp->panel_power_down_delay);
 	if (time_after(jiffies, off_time)) {
 		DRM_DEBUG_KMS("Time already passed");
-- 
1.7.6.3

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