[PATCH 05/23] drm/i915: Trim i915_do_reset() to minimum delays

[Chris Wilson]

Remove the "safety-factor" in our udelays for i915_do_reset(). If we are
told to hold the line high for 20us, do it only for 20us plus the tiny
bit of udelay latency.

Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
---
 drivers/gpu/drm/i915/i915_reset.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_reset.c b/drivers/gpu/drm/i915/i915_reset.c
index 0853cdcdce99..aa6826ae2e8c 100644
--- a/drivers/gpu/drm/i915/i915_reset.c
+++ b/drivers/gpu/drm/i915/i915_reset.c
@@ -167,12 +167,12 @@ static int i915_do_reset(struct drm_i915_private *i915,
 
 	/* Assert reset for at least 20 usec, and wait for acknowledgement. */
 	pci_write_config_byte(pdev, I915_GDRST, GRDOM_RESET_ENABLE);
-	udelay(50);
+	udelay(20);
 	err = wait_for_atomic(i915_in_reset(pdev), 50);
 
 	/* Clear the reset request. */
 	pci_write_config_byte(pdev, I915_GDRST, 0);
-	udelay(50);
+	udelay(20);
 	if (!err)
 		err = wait_for_atomic(!i915_in_reset(pdev), 50);
 
-- 
2.20.1