[PATCH 4.2.y-ckt 37/59] drm/radeon: make sure vertical front porch is at least 1

From	Kamal Mostafa <kamal@canonical.com>
Newsgroups	linux.kernel
Subject	[PATCH 4.2.y-ckt 37/59] drm/radeon: make sure vertical front porch is at least 1
Date	2016-05-09 22:00 +0200
Message-ID	<rwZvt-3Ct-13@gated-at.bofh.it> (permalink)
References	<rwZvs-3Ct-3@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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4.2.8-ckt10 -stable review patch.  If anyone has any objections, please let me know.

---8<------------------------------------------------------------

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

commit 3104b8128d4d646a574ed9d5b17c7d10752cd70b upstream.

hw doesn't like a 0 value.

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
---
 drivers/gpu/drm/radeon/atombios_encoders.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/gpu/drm/radeon/atombios_encoders.c b/drivers/gpu/drm/radeon/atombios_encoders.c
index adf74f4..0b04b92 100644
--- a/drivers/gpu/drm/radeon/atombios_encoders.c
+++ b/drivers/gpu/drm/radeon/atombios_encoders.c
@@ -310,6 +310,10 @@ static bool radeon_atom_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 (radeon_encoder->active_device & (ATOM_DEVICE_LCD_SUPPORT)) {
 		radeon_panel_mode_fixup(encoder, adjusted_mode);
-- 
2.7.4

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[PATCH 4.2.y-ckt 37/59] drm/radeon: make sure vertical front porch is at least 1 Kamal Mostafa <kamal@canonical.com> - 2016-05-09 22:00 +0200

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