From 0f64614dde172e4f4b2734a55091a4d307863cbb Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Ville=20Syrj=C3=A4l=C3=A4?= <ville.syrjala@linux.intel.com> Date: Wed, 26 Aug 2015 19:39:18 +0300 Subject: [PATCH] drm/i915: Fix clock readout when pipes are enabled w/o ports MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit The BIOS sometimes likes to enable pipes w/o any ports, at least on older machines. Currently we fail to assign anything sensible to crtc->hwmode.crtc_clock which leads to complaints from the vblank code. Deal with active pipes w/o ports and assign something sensible to crtc_clock in i9xx_get_pipe_config(). The encoder .get_config() will override this if the port is enabled. Gets rid of rest of these on my gen4: [drm:drm_calc_timestamping_constants [drm]] *ERROR* crtc 24: Can't calculate constants, dotclock = 0! [drm:i915_get_vblank_timestamp] crtc 1 is disabled v2: Fill out crtc_clock already in i9xx_get_pipe_config() (Maarten) Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com> Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com> Reviewed-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch> --- drivers/gpu/drm/i915/intel_display.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c index f32206d959861..ba0c85e69f6f0 100644 --- a/drivers/gpu/drm/i915/intel_display.c +++ b/drivers/gpu/drm/i915/intel_display.c @@ -8059,6 +8059,14 @@ static bool i9xx_get_pipe_config(struct intel_crtc *crtc, else i9xx_crtc_clock_get(crtc, pipe_config); + /* + * Normally the dotclock is filled in by the encoder .get_config() + * but in case the pipe is enabled w/o any ports we need a sane + * default. + */ + pipe_config->base.adjusted_mode.crtc_clock = + pipe_config->port_clock / pipe_config->pixel_multiplier; + return true; }