On Sun, Apr 13, 2014 at 12:00:33PM +0200, Daniel Vetter wrote: > ... our current modeset code isn't good enough yet to handle this. The > scenario is: > > 1. BIOS sets up a cloned config with lvds+external screen on the same > pipe, e.g. pipe B. > > 2. We read out that state for pipe B and assign the gmch_pfit state to > it. > > 3. The initial modeset switches the lvds to pipe A but due to lack of > atomic modeset we don't recompute the config of pipe B. > > -> both pipes now claim (in the sw pipe config structure) to use the > gmch_pfit, which just won't work. > > Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=74081 Tested-by: max <manikulin@xxxxxxxxx> > Cc: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx> > Cc: stable@xxxxxxxxxxxxxxx > Signed-off-by: Daniel Vetter <daniel.vetter@xxxxxxxx> > --- > drivers/gpu/drm/i915/intel_display.c | 23 ++++++++++++++++++----- > drivers/gpu/drm/i915/intel_drv.h | 3 ++- > 2 files changed, 20 insertions(+), 6 deletions(-) > > diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c > index 1390ab5e00dc..7b7987dc65ba 100644 > --- a/drivers/gpu/drm/i915/intel_display.c > +++ b/drivers/gpu/drm/i915/intel_display.c > @@ -9655,11 +9655,22 @@ intel_pipe_config_compare(struct drm_device *dev, > PIPE_CONF_CHECK_I(pipe_src_w); > PIPE_CONF_CHECK_I(pipe_src_h); > > - PIPE_CONF_CHECK_I(gmch_pfit.control); > - /* pfit ratios are autocomputed by the hw on gen4+ */ > - if (INTEL_INFO(dev)->gen < 4) > - PIPE_CONF_CHECK_I(gmch_pfit.pgm_ratios); > - PIPE_CONF_CHECK_I(gmch_pfit.lvds_border_bits); > + /* > + * FIXME: BIOS likes to set up a cloned config with lvds+external > + * screen. Since we don't yet re-compute the pipe config when moving > + * just the lvds port away to another pipe the sw tracking won't match. > + * > + * Proper atomic modesets with recomputed global state will fix this. > + * Until then just don't check gmch state for inherited modes. > + */ > + if (!PIPE_CONF_QUIRK(PIPE_CONFIG_QUIRK_INHERITED_MODE)) { > + PIPE_CONF_CHECK_I(gmch_pfit.control); > + /* pfit ratios are autocomputed by the hw on gen4+ */ > + if (INTEL_INFO(dev)->gen < 4) > + PIPE_CONF_CHECK_I(gmch_pfit.pgm_ratios); > + PIPE_CONF_CHECK_I(gmch_pfit.lvds_border_bits); > + } > + > PIPE_CONF_CHECK_I(pch_pfit.enabled); > if (current_config->pch_pfit.enabled) { > PIPE_CONF_CHECK_I(pch_pfit.pos); > @@ -11618,6 +11629,8 @@ static void intel_modeset_readout_hw_state(struct drm_device *dev) > base.head) { > memset(&crtc->config, 0, sizeof(crtc->config)); > > + crtc->config.quirks |= PIPE_CONFIG_QUIRK_INHERITED_MODE; > + > crtc->active = dev_priv->display.get_pipe_config(crtc, > &crtc->config); > > diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h > index c551472b892e..b885df150910 100644 > --- a/drivers/gpu/drm/i915/intel_drv.h > +++ b/drivers/gpu/drm/i915/intel_drv.h > @@ -236,7 +236,8 @@ struct intel_crtc_config { > * tracked with quirk flags so that fastboot and state checker can act > * accordingly. > */ > -#define PIPE_CONFIG_QUIRK_MODE_SYNC_FLAGS (1<<0) /* unreliable sync mode.flags */ > +#define PIPE_CONFIG_QUIRK_MODE_SYNC_FLAGS (1<<0) /* unreliable sync mode.flags */ > +#define PIPE_CONFIG_QUIRK_INHERITED_MODE (1<<1) /* mode inherited from firmware */ > unsigned long quirks; > > /* User requested mode, only valid as a starting point to > -- > 1.8.4.rc3 > -- Daniel Vetter Software Engineer, Intel Corporation +41 (0) 79 365 57 48 - http://blog.ffwll.ch _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/intel-gfx
