drm/radeon/DCE4+: clear bios scratch dpms bit (v2)

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@amd.com>
Cc: stable@vger.kernel.org

1 files changed, 4 insertions, 0 deletions

diff --git a/drivers/gpu/drm/radeon/radeon_atombios.c b/drivers/gpu/drm/radeon/radeon_atombios.c
index f48bd6dc10cd..30844814c25a 100644
--- a/drivers/gpu/drm/radeon/radeon_atombios.c
+++ b/drivers/gpu/drm/radeon/radeon_atombios.c
@@ -3938,6 +3938,10 @@ void radeon_atom_initialize_bios_scratch_regs(struct drm_device *dev)
         /* 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);