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drm/i915: Reject modeset if the dotclock is too high

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Reject the modeset if the requested dotclock exceeds the maximum allowed
by the hardware. So far we've only checked this on gen2/3 while also
handling the double wide vs. single wide pipe selection. Extend the
check to all platforms since we have the max dotclock correctly
populated now across the board.

Testcase: igt/kms_invalid_dotclock
Cc: Mika Kahola <mika.kahola@intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1464114859-15610-1-git-send-email-ville.syrjala@linux.intel.com
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
This commit is contained in:
Ville Syrjälä 2016-05-24 21:34:18 +03:00
parent bb14316551
commit f326115630
1 changed files with 9 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

18
drivers/gpu/drm/i915/intel_display.c
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@ -6624,10 +6624,10 @@ static int intel_crtc_compute_config(struct intel_crtc *crtc,
struct drm_device *dev = crtc->base.dev;
struct drm_i915_private *dev_priv = dev->dev_private;
const struct drm_display_mode *adjusted_mode = &pipe_config->base.adjusted_mode;
int clock_limit = dev_priv->max_dotclk_freq;
/* FIXME should check pixel clock limits on all platforms */
if (INTEL_INFO(dev)->gen < 4) {
int clock_limit = dev_priv->max_cdclk_freq * 9 / 10;
clock_limit = dev_priv->max_cdclk_freq * 9 / 10;
/*
* Enable double wide mode when the dot clock
@ -6635,16 +6635,16 @@ static int intel_crtc_compute_config(struct intel_crtc *crtc,
*/
if (intel_crtc_supports_double_wide(crtc) &&
adjusted_mode->crtc_clock > clock_limit) {
clock_limit *= 2;
clock_limit = dev_priv->max_dotclk_freq;
pipe_config->double_wide = true;
}
}
if (adjusted_mode->crtc_clock > clock_limit) {
DRM_DEBUG_KMS("requested pixel clock (%d kHz) too high (max: %d kHz, double wide: %s)\n",
adjusted_mode->crtc_clock, clock_limit,
yesno(pipe_config->double_wide));
return -EINVAL;
}
if (adjusted_mode->crtc_clock > clock_limit) {
DRM_DEBUG_KMS("requested pixel clock (%d kHz) too high (max: %d kHz, double wide: %s)\n",
adjusted_mode->crtc_clock, clock_limit,
yesno(pipe_config->double_wide));
return -EINVAL;
}
/*