Re: [PATCH 1/5] drm/i915/chv: Remove Wait for a previous gfx force-off

[Deepak S <deepak.s@linux.intel.com>]

On Thursday 26 February 2015 09:13 PM, Ville Syrjälä wrote:
> On Thu, Feb 26, 2015 at 08:46:54PM +0530, deepak.s@linux.intel.com wrote:
>> From: Deepak S <deepak.s@linux.intel.com>
>>
>> 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

>> Signed-off-by: Deepak S <deepak.s@linux.intel.com>
>> ---
>>   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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