[Intel-gfx] [PATCH] drm/i915: Get correct display clock on 945gm
arthur at aheymans.xyz
Fri Jan 27 16:45:06 UTC 2017
Ville Syrjälä <ville.syrjala at linux.intel.com> writes:
> On Fri, Jan 27, 2017 at 03:44:27PM +0100, Arthur Heymans wrote:
> That indeed is what the docs say.
> The code is tantalizingly close to the 915gm code now, so maybe
> we could share it with a simple
> if (IS_915GM(dev_priv))
> return 320000;
> return 333333;
Agreed but it's the other way around ;)
> Now if someone could figure out where to dig up the DDR and FSB clocks
> we could also fix up the 190 vs. 200 MHz case...
>> + default:
>> + case GC_DISPLAY_CLOCK_190_200_MHZ:
>> + return 200000;
>> + }
>> + }
Hmm that seems to be 915gm specific (always 200 on 945gm). According to
"Mobile Intel® 915/910 Express Chipset: Datasheet", the only fsb/dram
combo that has 190MHz is FSB: 533MHz, DDR333. All the other supported
combos have 200Mhz set by that configuration.
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