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drm/i915: Read timings from the correct transcoder in intel_crtc_mode_get() 

intel_crtc->config->cpu_transcoder isn't yet filled out when
intel_crtc_mode_get() gets called during output probing, so we should
not use it there. Instead intel_crtc_mode_get() figures out the correct
transcoder on its own, and that's what we should use.

If the BIOS boots LVDS on pipe B, intel_crtc_mode_get() would actually
end up reading the timings from pipe A instead (since PIPE_A==0),
which clearly isn't what we want.

It looks to me like this may have been broken by
commit eccb140bca ("drm/i915: hw state readout&check support for cpu_transcoder")
as that one removed the early initialization of cpu_transcoder from
intel_crtc_init().

Cc: stable@vger.kernel.org
Cc: dri-devel@lists.freedesktop.org
Cc: Rob Kramer <rob@solution-space.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Reported-by: Rob Kramer <rob@solution-space.com>
Fixes: eccb140bca ("drm/i915: hw state readout&check support for cpu_transcoder")
References: https://lists.freedesktop.org/archives/dri-devel/2016-April/104142.html
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/1459525046-19425-1-git-send-email-ville.syrjala@linux.intel.com
This commit is contained in:
Ville Syrjälä 2016-04-01 18:37:25 +03:00
parent a883241c39
commit e30a154b52
1 changed files with 9 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
drivers/gpu/drm/i915/intel_display.c
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@ -10253,13 +10253,10 @@ struct drm_display_mode *intel_crtc_mode_get(struct drm_device *dev,
{
struct drm_i915_private *dev_priv = to_i915(dev);
struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
enum transcoder cpu_transcoder = intel_crtc->config->cpu_transcoder;
enum transcoder cpu_transcoder;
struct drm_display_mode *mode;
struct intel_crtc_state *pipe_config;
int htot = I915_READ(HTOTAL(cpu_transcoder));
int hsync = I915_READ(HSYNC(cpu_transcoder));
int vtot = I915_READ(VTOTAL(cpu_transcoder));
int vsync = I915_READ(VSYNC(cpu_transcoder));
u32 htot, hsync, vtot, vsync;
enum pipe pipe = intel_crtc->pipe;
mode = kzalloc(sizeof(*mode), GFP_KERNEL);
@ -10287,6 +10284,13 @@ struct drm_display_mode *intel_crtc_mode_get(struct drm_device *dev,
i9xx_crtc_clock_get(intel_crtc, pipe_config);
mode->clock = pipe_config->port_clock / pipe_config->pixel_multiplier;
cpu_transcoder = pipe_config->cpu_transcoder;
htot = I915_READ(HTOTAL(cpu_transcoder));
hsync = I915_READ(HSYNC(cpu_transcoder));
vtot = I915_READ(VTOTAL(cpu_transcoder));
vsync = I915_READ(VSYNC(cpu_transcoder));
mode->hdisplay = (htot & 0xffff) + 1;
mode->htotal = ((htot & 0xffff0000) >> 16) + 1;
mode->hsync_start = (hsync & 0xffff) + 1;