[Intel-gfx] [PATCH 2/3] drm/i915: Correct the Ref clock value for BXT

[Ville Syrjälä]

On Fri, Dec 04, 2015 at 04:25:19PM +0000, Deepak, M wrote:
> 
> 
> > -----Original Message-----
> > From: Daniel Vetter [mailto:daniel.vetter at ffwll.ch] On Behalf Of Daniel
> > Vetter
> > Sent: Friday, December 4, 2015 9:52 PM
> > To: Ville Syrjälä <ville.syrjala at linux.intel.com>
> > Cc: Deepak, M <m.deepak at intel.com>; intel-gfx at lists.freedesktop.org
> > Subject: Re: [Intel-gfx] [PATCH 2/3] drm/i915: Correct the Ref clock value for
> > BXT
> > 
> > On Fri, Dec 04, 2015 at 11:55:56AM +0200, Ville Syrjälä wrote:
> > > On Fri, Dec 04, 2015 at 07:47:38PM +0530, Deepak M wrote:
> > > > The reference clock for BXT is 19.2 MHz not 19.5 MHz, updating the
> > > > correct value here.
> > > >
> > > > Signed-off-by: Deepak M <m.deepak at intel.com>
> > > > ---
> > > >  drivers/gpu/drm/i915/i915_reg.h | 2 +-
> > > >  1 file changed, 1 insertion(+), 1 deletion(-)
> > > >
> > > > diff --git a/drivers/gpu/drm/i915/i915_reg.h
> > > > b/drivers/gpu/drm/i915/i915_reg.h index 8bd2699..009f474 100644
> > > > --- a/drivers/gpu/drm/i915/i915_reg.h
> > > > +++ b/drivers/gpu/drm/i915/i915_reg.h
> > > > @@ -7676,7 +7676,7 @@ enum skl_disp_power_wells {
> > > >  #define BXT_DSI_PLL_RATIO_MAX		0x7D
> > > >  #define BXT_DSI_PLL_RATIO_MIN		0x22
> > > >  #define BXT_DSI_PLL_RATIO_MASK		0xFF
> > > > -#define BXT_REF_CLOCK_KHZ		19500
> > > > +#define BXT_REF_CLOCK_KHZ		19200
> > >
> > > No idea why we have this define in i915_reg.h. We don't have such
> > > defines for other platforms (also my fix CHV refclk to 19.2MHz patch
> > > never got reviewed by anyone either. Interedted?)
> > 
> > Add link and I think Deepak is volunteered ;-)
> > >
> [Deepak, M] Please share the link, I can go through the patch :)

This is the whole series:
http://lists.freedesktop.org/archives/intel-gfx/2015-September/075097.html
Some of it might have bitrotted a bit, but nothing a rebase wouldn't
fix I think.

There's also this other patch dealing with dual-link (which I've never
tested due to lack of hardware):
http://lists.freedesktop.org/archives/intel-gfx/2015-September/075568.html

> 
> > > Reviewed-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
> > 
> > Queued for -next, thanks for the patch.
> > -Daniel
> > >
> > > >
> > > >  #define BXT_DSI_PLL_ENABLE		0x46080
> > > >  #define  BXT_DSI_PLL_DO_ENABLE		(1 << 31)
> > > > --
> > > > 1.9.1
> > > >
> > > > _______________________________________________
> > > > Intel-gfx mailing list
> > > > Intel-gfx at lists.freedesktop.org
> > > > http://lists.freedesktop.org/mailman/listinfo/intel-gfx
> > >
> > > --
> > > Ville Syrjälä
> > > Intel OTC
> > > _______________________________________________
> > > Intel-gfx mailing list
> > > Intel-gfx at lists.freedesktop.org
> > > http://lists.freedesktop.org/mailman/listinfo/intel-gfx
> > 
> > --
> > Daniel Vetter
> > Software Engineer, Intel Corporation
> > http://blog.ffwll.ch

-- 
Ville Syrjälä
Intel OTC