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drm/amdgpu: make sure vertical front porch is at least 1 

hw doesn't like a 0 value.

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
This commit is contained in:
Alex Deucher 2016-05-02 18:54:39 -04:00
parent 3104b8128d
commit 0126d4b9a5
1 changed files with 4 additions and 0 deletions
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4
drivers/gpu/drm/amd/amdgpu/atombios_encoders.c
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@ -298,6 +298,10 @@ bool amdgpu_atombios_encoder_mode_fixup(struct drm_encoder *encoder,
&& (mode->crtc_vsync_start < (mode->crtc_vdisplay + 2)))
adjusted_mode->crtc_vsync_start = adjusted_mode->crtc_vdisplay + 2;
/* vertical FP must be at least 1 */
if (mode->crtc_vsync_start == mode->crtc_vdisplay)
adjusted_mode->crtc_vsync_start++;
/* get the native mode for scaling */
if (amdgpu_encoder->active_device & (ATOM_DEVICE_LCD_SUPPORT))
amdgpu_panel_mode_fixup(encoder, adjusted_mode);