linux-kernel - Re: [PATCH 2/2] drm/i915: Use the fixed pixel clock for eDP in intel_dp_set_m

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Date:	Sun, 17 Mar 2013 23:12:03 +0100
From:	Daniel Vetter <daniel@...ll.ch>
To:	Takashi Iwai <tiwai@...e.de>
Cc:	Daniel Vetter <daniel.vetter@...ll.ch>,
	intel-gfx@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] drm/i915: Use the fixed pixel clock for eDP in
 intel_dp_set_m_n()

On Tue, Mar 12, 2013 at 04:32:28PM +0100, Takashi Iwai wrote:
> The eDP output on HP Z1 is still broken when X is started even after
> fixing the infinite link-train loop.  The regression was introduced in
> 3.6 kernel for cleaning up the mode clock handling code in intel_dp.c.
> 
> In the past, the clock of the reference mode was modified in
> intel_dp_mode_fixup() in the case of eDP fixed clock, and this clock was
> used for calculating in intel_dp_set_m_n().  This override was removed,
> thus the wrong mode clock is used for the calculation, resulting in a
> psychedelic smoking output in the end.
> 
> This patch corrects the clock to be used in the place.
> 
> Cc: <stable@...r.kernel.org>
> Signed-off-by: Takashi Iwai <tiwai@...e.de>

I truly hate this mess of dotclock vs portclock vs. whatever. Can you pls
apply a little bikeshed and use the existing intel_edp_target_clock like
in ironlake_set_m_n? And if you have the regressing commit a little
citation to assign the blame (it's probably me) would be good.

Thanks, Daniel
-- 
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch
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