[PATCH 3.4 21/30] drm/radeon/DCE4+: clear bios scratch dpms bit (v2)

From: Greg Kroah-Hartman
Date: Tue Feb 11 2014 - 14:13:29 EST


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

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

From: Alex Deucher <alexander.deucher@xxxxxxx>

commit 6802d4bad83f50081b2788698570218aaff8d10e upstream.

The BlankCrtc table in some DCE8 boards has some
logic shortcuts for the vbios when this bit is set.
Clear it for driver use.

v2: fix typo

Bug:
https://bugs.freedesktop.org/show_bug.cgi?id=73420

Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
drivers/gpu/drm/radeon/radeon_atombios.c | 4 ++++
1 file changed, 4 insertions(+)

--- a/drivers/gpu/drm/radeon/radeon_atombios.c
+++ b/drivers/gpu/drm/radeon/radeon_atombios.c
@@ -2785,6 +2785,10 @@ void radeon_atom_initialize_bios_scratch
/* tell the bios not to handle mode switching */
bios_6_scratch |= ATOM_S6_ACC_BLOCK_DISPLAY_SWITCH;

+ /* clear the vbios dpms state */
+ if (ASIC_IS_DCE4(rdev))
+ bios_2_scratch &= ~ATOM_S2_DEVICE_DPMS_STATE;
+
if (rdev->family >= CHIP_R600) {
WREG32(R600_BIOS_2_SCRATCH, bios_2_scratch);
WREG32(R600_BIOS_6_SCRATCH, bios_6_scratch);


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