Re: [PATCH] drm/i915: fix assert_cursor on BDW

[Jani Nikula <jani.nikula@linux.intel.com>]

On Thu, 27 Feb 2014, Ville Syrjälä <ville.syrjala@linux.intel.com> wrote:
> On Thu, Feb 27, 2014 at 04:30:56PM -0300, Paulo Zanoni wrote:
>> From: Paulo Zanoni <paulo.r.zanoni@intel.com>
>> 
>> We need to read the correct register, not a register that doesn't exist
>> and will trigger "Unclaimed register" messages when we touch it.
>> 
>> Also rearrange the checks in an attempt to prevent this error from
>> happening again.
>> 
>> Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
>
> Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>

Pushed to -fixes, thanks for the patch and review.

BR,
Jani.

>
> I was thinking you might want to rearrange intel_crtc_update_cursor()
> the same way, but maybe it's not worth the effort. We may soon have
> to take a look at using the pipe_offsets[] stuff for cursors anyway.
>
>> ---
>>  drivers/gpu/drm/i915/intel_display.c | 9 +++++----
>>  1 file changed, 5 insertions(+), 4 deletions(-)
>> 
>> This patch is untested, but the "Uncalimed register" message is real, as long as
>> we have the patch to print them.
>> 
>> diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
>> index f19e6ea..2e05d1e 100644
>> --- a/drivers/gpu/drm/i915/intel_display.c
>> +++ b/drivers/gpu/drm/i915/intel_display.c
>> @@ -1095,12 +1095,13 @@ static void assert_cursor(struct drm_i915_private *dev_priv,
>>  	struct drm_device *dev = dev_priv->dev;
>>  	bool cur_state;
>>  
>> -	if (IS_IVYBRIDGE(dev) || IS_HASWELL(dev))
>> -		cur_state = I915_READ(CURCNTR_IVB(pipe)) & CURSOR_MODE;
>> -	else if (IS_845G(dev) || IS_I865G(dev))
>> +
>> +	if (IS_845G(dev) || IS_I865G(dev))
>>  		cur_state = I915_READ(_CURACNTR) & CURSOR_ENABLE;
>> -	else
>> +	else if (INTEL_INFO(dev)->gen <= 6 || IS_VALLEYVIEW(dev))
>>  		cur_state = I915_READ(CURCNTR(pipe)) & CURSOR_MODE;
>> +	else
>> +		cur_state = I915_READ(CURCNTR_IVB(pipe)) & CURSOR_MODE;
>>  
>>  	WARN(cur_state != state,
>>  	     "cursor on pipe %c assertion failure (expected %s, current %s)\n",
>> -- 
>> 1.8.5.3
>> 
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>
> -- 
> Ville Syrjälä
> Intel OTC
> _______________________________________________
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> Intel-gfx@lists.freedesktop.org
> http://lists.freedesktop.org/mailman/listinfo/intel-gfx

-- 
Jani Nikula, Intel Open Source Technology Center
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