[Intel-gfx] [PATCH 2/5] drm/i915: Do not read GAMMA_MODE register

Lionel Landwerlin lionel.g.landwerlin at intel.com
Tue Feb 23 10:36:36 UTC 2016

On 23/02/16 00:38, Matt Roper wrote:
> On Mon, Feb 22, 2016 at 02:18:08PM +0000, Lionel Landwerlin wrote:
>> Implement Daniel Stone's recommendation to not read registers to infer
>> the hardware's state.
>> Signed-off-by: Lionel Landwerlin <lionel.g.landwerlin at intel.com>
> Do we need to ensure that software and hardware state are synchronized
> at startup?  A boot firmware might have set it to something different
> before our driver starts up; if we use 'fastboot' then we might not do
> any modesets and might wind up with 0 (8BIT) in our state variable, but
> something else actually programmed into the hardware.
> Matt

Thanks Matt,

It makes sense know, I couldn't understand why this would ever be at 
something different that 8bit mode...
I guess the value should be read from the intel_color_init() function 
upon startup.


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