From: Daniel Vetter <daniel@ffwll.ch>
To: "Ville Syrjälä" <ville.syrjala@linux.intel.com>
Cc: intel-gfx@lists.freedesktop.org
Subject: Re: [PATCH 01/12] drm/i915: Grab the pixel clock from adjusted_mode not requested_mode
Date: Tue, 3 Sep 2013 13:23:23 +0200 [thread overview]
Message-ID: <20130903112323.GF5767@phenom.ffwll.local> (raw)
In-Reply-To: <20130903100114.GE11428@intel.com>
On Tue, Sep 03, 2013 at 01:01:14PM +0300, Ville Syrjälä wrote:
> On Mon, Sep 02, 2013 at 08:38:16PM +0200, Daniel Vetter wrote:
> > On Mon, Sep 02, 2013 at 09:13:28PM +0300, ville.syrjala@linux.intel.com wrote:
> > > From: Ville Syrjälä <ville.syrjala@linux.intel.com>
> > >
> > > intel_crtc_compute_config() and i9xx_set_pipeconf() attempt to get
> > > the current pixel clock from requested_mode. requested_mode.clock may
> > > be totally bogus, so the clock should come from adjusted_mode.
> > >
> > > Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
> > > ---
> > > drivers/gpu/drm/i915/intel_display.c | 5 ++---
> > > 1 file changed, 2 insertions(+), 3 deletions(-)
> > >
> > > diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> > > index ecb8b52..cab1319 100644
> > > --- a/drivers/gpu/drm/i915/intel_display.c
> > > +++ b/drivers/gpu/drm/i915/intel_display.c
> > > @@ -4124,8 +4124,7 @@ static int intel_crtc_compute_config(struct intel_crtc *crtc,
> > >
> > > if (HAS_PCH_SPLIT(dev)) {
> > > /* FDI link clock is fixed at 2.7G */
> > > - if (pipe_config->requested_mode.clock * 3
> > > - > IRONLAKE_FDI_FREQ * 4)
> > > + if (adjusted_mode->clock * 3 > IRONLAKE_FDI_FREQ * 4)
> >
> > Note quite: The fdi dotclock is the adjusted mode's clock but with the
> > pixel multiplier _not_ taken into account. See
> > ironlake_fdi_compute_config. Maybe we need a fdi_dotclock_from_pipe_config
> > helper function?
>
> Dang those pixel multipliers. I need to study on the topic a bit more.
> I'm confused whether the pipe is actually pushing out pixels at the
> non-multiplied rate or the multiplied rate. That's an important detail
> when we consider the CDCLK vs. pipe pixel rate limitations.
On pch ports the pixel multiplier is in the pch dpll, so I think the data
pushed over the fdi link isn't multiplied. Iirc I've even bothered with
some tests, but not sure any more ... I vaguely remember that I've broken
Chris' ilk+sdvo machine a few times in the process of getting this fleshed
out ;-)
-Daniel
--
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch
next prev parent reply other threads:[~2013-09-03 11:23 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-09-02 18:13 [PATCH 00/12] drm/i915: pipe_config, adjusted_mode vs. requested_mode, etc ville.syrjala
2013-09-02 18:13 ` [PATCH 01/12] drm/i915: Grab the pixel clock from adjusted_mode not requested_mode ville.syrjala
2013-09-02 18:38 ` Daniel Vetter
2013-09-03 10:01 ` Ville Syrjälä
2013-09-03 11:23 ` Daniel Vetter [this message]
2013-09-03 12:08 ` Ville Syrjälä
2013-09-03 13:45 ` Daniel Vetter
2013-09-03 10:31 ` [PATCH] drm/i915: Kill IRONLAKE_FDI_FREQ check ville.syrjala
2013-09-03 11:24 ` Daniel Vetter
2013-09-02 18:13 ` [PATCH 02/12] drm/i915: Use adjusted_mode->clock in lpt_program_iclkip ville.syrjala
2013-09-02 18:13 ` [PATCH 03/12] drm/i915: Use adjusted_mode in HDMI 12bpc clock check ville.syrjala
2013-09-02 18:39 ` Daniel Vetter
2013-09-02 19:05 ` Ville Syrjälä
2013-09-03 7:50 ` Daniel Vetter
2013-09-03 9:33 ` [PATCH] drm/i915: Document the use of requested_mode, adjusted_mode, and pipe_src_{w, h} ville.syrjala
2013-09-02 18:13 ` [PATCH 04/12] drm/i915: Use adjusted_mode in intel_update_fbc() ville.syrjala
2013-09-02 18:13 ` [PATCH 05/12] drm/i915: Use adjusted_mode appropriately when computing watermarks ville.syrjala
2013-09-02 18:13 ` [PATCH 06/12] drm/i915: Check the clock from adjusted mode in intel_crtc_active() ville.syrjala
2013-09-02 18:13 ` [PATCH 07/12] drm/i915: Use adjusted_mode when checking conditions for PSR ville.syrjala
2013-09-02 18:13 ` [PATCH 08/12] drm/i915: Make intel_crtc_active() available outside intel_pm.c ville.syrjala
2013-09-02 18:42 ` Daniel Vetter
2013-09-02 19:46 ` [PATCH v2] " ville.syrjala
2013-09-02 18:13 ` [PATCH 09/12] drm/i915: Use pipe config in sprite code ville.syrjala
2013-09-02 18:13 ` [PATCH 10/12] drm/i915: Use adjusted_mode in DSI PLL calculations ville.syrjala
2013-09-02 18:13 ` [PATCH 11/12] drm/i915: Add explicit pipe src size to pipe config ville.syrjala
2013-09-02 18:46 ` Daniel Vetter
2013-09-02 19:11 ` Ville Syrjälä
2013-09-03 7:52 ` Daniel Vetter
2013-09-03 9:32 ` Ville Syrjälä
2013-09-02 18:13 ` [PATCH 12/12] drm/i915: Fix pipe config warnings when dealing with LVDS fixed mode ville.syrjala
2013-09-02 18:44 ` Daniel Vetter
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