On Thursday 26 February 2015 09:12 PM, Deepak S wrote:
On Thursday 26 February 2015 09:13 PM, Ville Syrjälä wrote:
On Thu, Feb 26, 2015 at 08:46:54PM +0530, deepak.s@xxxxxxxxxxxxxxx
wrote:
From: Deepak S <deepak.s@xxxxxxxxxxxxxxx>
On CHV, PUNIT team confirmed that 'VLV_GFX_CLK_STATUS_BIT' is not a
sticky bit and it will always be set. So ignore Check for previous
Gfx force off during suspend and allow the force clk as part S0ix
Sequence
Do we need the force clock at all since we don't do any gunit register
save/restore? I tried to peddle a patch to remove it totally in this bug
report, but never got any decent answer back:
https://bugs.freedesktop.org/show_bug.cgi?id=87086
hmm. your right we might not need. Let me confirm
Hi Ville,
Based on the spec we still need to follow the Gfx force clk sequence :(
Can you review the patch to skip wait for previous Gfx force-off?
This patch has gone through lot of S0ix testing.
Thanks
Deepak
Signed-off-by: Deepak S <deepak.s@xxxxxxxxxxxxxxx>
---
drivers/gpu/drm/i915/i915_drv.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_drv.c
b/drivers/gpu/drm/i915/i915_drv.c
index 4badb23..b88b7b1 100644
--- a/drivers/gpu/drm/i915/i915_drv.c
+++ b/drivers/gpu/drm/i915/i915_drv.c
@@ -1193,11 +1193,13 @@ int vlv_force_gfx_clock(struct
drm_i915_private *dev_priv, bool force_on)
int err;
val = I915_READ(VLV_GTLC_SURVIVABILITY_REG);
- WARN_ON(!!(val & VLV_GFX_CLK_FORCE_ON_BIT) == force_on);
#define COND (I915_READ(VLV_GTLC_SURVIVABILITY_REG) &
VLV_GFX_CLK_STATUS_BIT)
/* Wait for a previous force-off to settle */
- if (force_on) {
+ if (force_on && !IS_CHERRYVIEW(dev_priv->dev)) {
+ /* WARN_ON only for the Valleyview */
+ WARN_ON(!!(val & VLV_GFX_CLK_FORCE_ON_BIT) == force_on);
+
err = wait_for(!COND, 20);
if (err) {
DRM_ERROR("timeout waiting for GFX clock force-off
(%08x)\n",
--
1.9.1
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