Commit 8f4b1068 authored Jul 18, 2019 by Ville Syrjälä

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>

parent 13ed13a4

drivers/gpu/drm/i915/display/intel_display.c

+15 −0

Original line number	Diff line number	Diff line
		@@ -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;
		}