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drm/i915: Check some transcoder timing minimum limits 

On ILK+ the documented min hdisplay is 64, min hblank is 32, and min
vblank is 5. On earlier platforms min hblank is also 32, and min
vblank is 3. Make sure the mode satisfies those limits.

There are further limits for HDMI and pfit use cases, but we'll check
for those in a more specific location.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190718144340.1114-2-ville.syrjala@linux.intel.com
Reviewed-by: Manasi Navare <manasi.d.navare@intel.com>
This commit is contained in:
Ville Syrjälä 2019-07-18 17:43:40 +03:00
parent 13ed13a4dc
commit 8f4b1068e7
1 changed files with 15 additions and 0 deletions
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15
drivers/gpu/drm/i915/display/intel_display.c
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@ -16294,6 +16294,21 @@ intel_mode_valid(struct drm_device *dev,
mode->vtotal > vtotal_max)
return MODE_V_ILLEGAL;
if (INTEL_GEN(dev_priv) >= 5) {
if (mode->hdisplay < 64 ||
mode->htotal - mode->hdisplay < 32)
return MODE_H_ILLEGAL;
if (mode->vtotal - mode->vdisplay < 5)
return MODE_V_ILLEGAL;
} else {
if (mode->htotal - mode->hdisplay < 32)
return MODE_H_ILLEGAL;
if (mode->vtotal - mode->vdisplay < 3)
return MODE_V_ILLEGAL;
}
return MODE_OK;
}