Re: [PATCH 1/3] drm/i915: Capture dmc firmware information before reset

[Michel Thierry <michel.thierry@intel.com>]

On 2/24/2017 11:22 AM, Chris Wilson wrote:
> On Fri, Feb 24, 2017 at 11:05:28AM -0800, Michel Thierry wrote:
>> The firmware may change between the hang and cat /sys/class/drm/card0/error
>>
>> Cc: Chris Wilson <chris@chris-wilson.co.uk>
>> Signed-off-by: Michel Thierry <michel.thierry@intel.com>
>
> Looks sane...
>
>> ---
>>  drivers/gpu/drm/i915/i915_drv.h       |  4 ++++
>>  drivers/gpu/drm/i915/i915_gpu_error.c | 22 ++++++++++++++++------
>>  2 files changed, 20 insertions(+), 6 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
>> index a74b87b1b5a9..3b0cff05f5f7 100644
>> --- a/drivers/gpu/drm/i915/i915_drv.h
>> +++ b/drivers/gpu/drm/i915/i915_drv.h
>> @@ -953,6 +953,10 @@ struct i915_gpu_state {
>>  	u32 gab_ctl;
>>  	u32 gfx_mode;
>>
>> +	/* Firmware load state */
>> +	u32 dmc_loaded;
>
> Can dmc_version be zero? i.e. Does !0 => dmc_loaded?
>

Nothing would stop them to build a v0.0 firmware, but in this case, we 
can save one variable.
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