On Wed, 30 May 2012 13:52:02 +0200, Daniel Vetter <daniel.vetter at ffwll.ch> wrote:
> ... instead of changing mode->clock, which we should leave as-is.
>
> We only touch that if it's a panel, and then adjusted mode->clock
> equals adjusted_mode->clock. Outside of intel_dp.c we only use
> ajusted_mode->clock in the mode_set functions.
>
> Within intel_dp.c we only use it to calculate the dp dithering
> and link bw parameters, so that's the only thing we need to fix
> up.
>
> As a temporary ugliness (until the cleanup in the next patch) we
> pass the adjusted_mode into dp_dither for both parameters (because
> that one still looks at mode->clock).
>
> Note that we do overwrite adjusted_mode->clock with the selected dp
> link clock, but that only happens after we've calculated everything we
> need based on the dotclock of the adjusted output configuration.
>
> v2: Adjust the debug message to also use adjusted_mode->clock.
>
> Signed-off-by: Daniel Vetter <daniel.vetter at ffwll.ch>
> ---
> drivers/gpu/drm/i915/intel_dp.c | 11 +++--------
> 1 file changed, 3 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
> index 296cfc2..a9dffa6 100644
> --- a/drivers/gpu/drm/i915/intel_dp.c
> +++ b/drivers/gpu/drm/i915/intel_dp.c
> @@ -698,11 +698,6 @@ intel_dp_mode_fixup(struct drm_encoder *encoder, struct drm_display_mode *mode,
> intel_fixed_panel_mode(intel_dp->panel_fixed_mode, adjusted_mode);
> intel_pch_panel_fitting(dev, DRM_MODE_SCALE_FULLSCREEN,
> mode, adjusted_mode);
> - /*
> - * the mode->clock is used to calculate the Data&Link M/N
> - * of the pipe. For the eDP the fixed clock should be used.
> - */
> - mode->clock = intel_dp->panel_fixed_mode->clock;
But in ironlake_crtc_mode_set() we have:
if (is_cpu_edp) {
target_clock = mode->clock;
} else {
if (is_dp)
target_clock = mode->clock;
else
target_clock = adjusted_mode->clock;
}
It would seem like eDP would have had mode->clock adjusted previously.
Similarly PCH eDP uses the adjusted mode->clock in intel_dp_set_m_n().
-Chris
--
Chris Wilson, Intel Open Source Technology Centre
