linux-kernel - [PATCH 1/2] drm/i915: Remove redundant reprobe in i915_drm

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Date:   Thu,  3 Nov 2016 11:42:37 -0400
From:   Lyude <lyude@...hat.com>
To:     intel-gfx@...ts.freedesktop.org
Cc:     Lyude <lyude@...hat.com>,
        David Weinehall <david.weinehall@...ux.intel.com>,
        Daniel Vetter <daniel.vetter@...el.com>,
        Jani Nikula <jani.nikula@...ux.intel.com>,
        David Airlie <airlied@...ux.ie>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: [PATCH 1/2] drm/i915: Remove redundant reprobe in i915_drm_resume

Weine's investigation on benchmarking the suspend/resume process pointed
out a lot of the time in suspend/resume is being spent reprobing. While
the reprobing process is a lengthy one for good reason, we don't need to
hold up the entire suspend/resume process while we wait for it to
finish. Luckily as it turns out, we already trigger a full connector
reprobe in i915_hpd_poll_init_work(), so we can just ditch reprobing in
i915_drm_resume() entirely.

This won't lead to less time spent resuming just yet since now the
bottleneck will be waiting for the mode_config lock in
drm_kms_helper_poll_enable(), since that will be held as long as
i915_hpd_poll_init_work() is reprobing all of the connectors. But we'll
address that in the next patch.

Signed-off-by: Lyude <lyude@...hat.com>
Cc: David Weinehall <david.weinehall@...ux.intel.com>
---
 drivers/gpu/drm/i915/i915_drv.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
index bfb2efd..532cc0f 100644
--- a/drivers/gpu/drm/i915/i915_drv.c
+++ b/drivers/gpu/drm/i915/i915_drv.c
@@ -1602,8 +1602,6 @@ static int i915_drm_resume(struct drm_device *dev)
 	 * notifications.
 	 * */
 	intel_hpd_init(dev_priv);
-	/* Config may have changed between suspend and resume */
-	drm_helper_hpd_irq_event(dev);

 	intel_opregion_register(dev_priv);

-- 
2.7.4