drm/radeon/kms: fix legacy LVDS dpms sequence

commit 15cb02c0a0338ee724bf23e31c7c410ecbffeeba upstream.

Add delay after turning off the LVDS encoder.

Fixes:
https://bugzilla.kernel.org/show_bug.cgi?id=16389

Tested-by: Jan Kreuzer <kontrollator@gmx.de>
Signed-off-by: Alex Deucher <alexdeucher@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/gpu/drm/radeon/radeon_legacy_encoders.c b/drivers/gpu/drm/radeon/radeon_legacy_encoders.c
index 00382122869b9c94dfeeff68c1f6a4d5ec2ad821..183bef831afb5752b111b846baf89adf3edb0f4a 100644 (file)
--- a/drivers/gpu/drm/radeon/radeon_legacy_encoders.c
+++ b/drivers/gpu/drm/radeon/radeon_legacy_encoders.c
@@ -89,6 +89,7 @@ static void radeon_legacy_lvds_dpms(struct drm_encoder *encoder, int mode)
                udelay(panel_pwr_delay * 1000);
                WREG32(RADEON_LVDS_GEN_CNTL, lvds_gen_cntl);
                WREG32_PLL(RADEON_PIXCLKS_CNTL, pixclks_cntl);
+               udelay(panel_pwr_delay * 1000);
                break;
        }