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    Subject[PATCH 4.4 56/67] drm/amdgpu: make sure vertical front porch is at least 1
    Date
    4.4-stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: Alex Deucher <alexander.deucher@amd.com>

    commit 0126d4b9a516256f2432ca0dc78ab293a8255378 upstream.

    hw doesn't like a 0 value.

    Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    drivers/gpu/drm/amd/amdgpu/atombios_encoders.c | 4 ++++
    1 file changed, 4 insertions(+)

    --- a/drivers/gpu/drm/amd/amdgpu/atombios_encoders.c
    +++ b/drivers/gpu/drm/amd/amdgpu/atombios_encoders.c
    @@ -298,6 +298,10 @@ bool amdgpu_atombios_encoder_mode_fixup(
    && (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);

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