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

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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
This commit is contained in:
Alex Deucher 2014-01-27 18:29:35 -05:00
parent ffcda352b5
commit 6802d4bad8
1 changed files with 4 additions and 0 deletions
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4
drivers/gpu/drm/radeon/radeon_atombios.c
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@ -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);