public inbox for intel-gfx@lists.freedesktop.org
 help / color / mirror / Atom feed
* [PATCH] drm/i915: Wait up to 3ms for the pcu to ack the cdclk change request on SKL
@ 2016-07-13 13:32 ville.syrjala
  2016-07-13 13:37 ` David Weinehall
                   ` (3 more replies)
  0 siblings, 4 replies; 7+ messages in thread
From: ville.syrjala @ 2016-07-13 13:32 UTC (permalink / raw)
  To: intel-gfx; +Cc: David Weinehall

From: Ville Syrjälä <ville.syrjala@linux.intel.com>

Bspec tells us to keep bashing the PCU for up to 3ms when trying to
inform it about an upcoming change in the cdclk frequency. Currently
we only keep at it for 15*10usec (+ whatever delays gets added by
the sandybridge_pcode_read() itself). Let's change the limit to 3ms.

I decided to keep 10 usec delay per iteration for now, even though
the spec doesn't really tell us to do that.

Cc: David Weinehall <david.weinehall@intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
---
 drivers/gpu/drm/i915/intel_display.c | 10 +---------
 1 file changed, 1 insertion(+), 9 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index be3b2cab2640..90f26f0e2571 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -5691,15 +5691,7 @@ static bool skl_cdclk_pcu_ready(struct drm_i915_private *dev_priv)
 
 static bool skl_cdclk_wait_for_pcu_ready(struct drm_i915_private *dev_priv)
 {
-	unsigned int i;
-
-	for (i = 0; i < 15; i++) {
-		if (skl_cdclk_pcu_ready(dev_priv))
-			return true;
-		udelay(10);
-	}
-
-	return false;
+	return _wait_for(skl_cdclk_pcu_ready(dev_priv), 3000, 10) == 0;
 }
 
 static void skl_set_cdclk(struct drm_i915_private *dev_priv, int cdclk, int vco)
-- 
2.7.4

_______________________________________________
Intel-gfx mailing list
Intel-gfx@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/intel-gfx

^ permalink raw reply related	[flat|nested] 7+ messages in thread

end of thread, other threads:[~2016-07-27 13:32 UTC | newest]

Thread overview: 7+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2016-07-13 13:32 [PATCH] drm/i915: Wait up to 3ms for the pcu to ack the cdclk change request on SKL ville.syrjala
2016-07-13 13:37 ` David Weinehall
2016-07-13 14:07 ` ✗ Ro.CI.BAT: failure for " Patchwork
2016-07-18 12:57   ` Ville Syrjälä
2016-07-13 18:42 ` [PATCH] " Chris Wilson
2016-07-14 14:39 ` Daniel Vetter
2016-07-27 13:32   ` Ville Syrjälä

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox