drm/radeon/atom: workaround vbios bug in transmitter table on rs780

commit c23632d4e57c0dd20bf50eca08fa0eb8ad3ff680 upstream.

Some rs780 asics seem to be affected as well.

See:
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=91f3a6aaf280294b07c05dfe606e6c27b7ba3c72

Fixes:
https://bugzilla.kernel.org/show_bug.cgi?id=60791

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

diff --git a/drivers/gpu/drm/radeon/atombios_encoders.c b/drivers/gpu/drm/radeon/atombios_encoders.c
index 7c2a28531cab19eabed6c6b14d12b66f57668f2b..56ed69ee6b91c7f473f353848ca71797a18d2af2 100644 (file)
--- a/drivers/gpu/drm/radeon/atombios_encoders.c
+++ b/drivers/gpu/drm/radeon/atombios_encoders.c
@@ -1657,7 +1657,7 @@ radeon_atom_encoder_dpms_dig(struct drm_encoder *encoder, int mode)
                         * does the same thing and more.
                         */
                        if ((rdev->family != CHIP_RV710) && (rdev->family != CHIP_RV730) &&
-                           (rdev->family != CHIP_RS880))
+                           (rdev->family != CHIP_RS780) && (rdev->family != CHIP_RS880))
                                atombios_dig_transmitter_setup(encoder, ATOM_TRANSMITTER_ACTION_ENABLE_OUTPUT, 0, 0);
                }
                if (ENCODER_MODE_IS_DP(atombios_get_encoder_mode(encoder)) && connector) {