drm/radeon/kms: fix s/r issues with bios scratch regs

commit 87364760de5d631390c478fcbac8db1b926e0adf upstream.

The accelerate mode bit gets checked by certain atom
command tables to set up some register state.  It needs
to be clear when setting modes and set when not.

Fixes:
https://bugzilla.kernel.org/show_bug.cgi?id=26942

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_atombios.c b/drivers/gpu/drm/radeon/radeon_atombios.c
index 2b038d0c2c86c644368825416bc99e73e4d9a8af..85a0d9f1f82b595a8e9d99e89e20b6bee1b1e5da 100644 (file)
--- a/drivers/gpu/drm/radeon/radeon_atombios.c
+++ b/drivers/gpu/drm/radeon/radeon_atombios.c
@@ -2303,7 +2303,7 @@ void radeon_atom_initialize_bios_scratch_regs(struct drm_device *dev)
        bios_2_scratch &= ~ATOM_S2_VRI_BRIGHT_ENABLE;
 
        /* tell the bios not to handle mode switching */
-       bios_6_scratch |= (ATOM_S6_ACC_BLOCK_DISPLAY_SWITCH | ATOM_S6_ACC_MODE);
+       bios_6_scratch |= ATOM_S6_ACC_BLOCK_DISPLAY_SWITCH;
 
        if (rdev->family >= CHIP_R600) {
                WREG32(R600_BIOS_2_SCRATCH, bios_2_scratch);
@@ -2354,10 +2354,13 @@ void radeon_atom_output_lock(struct drm_encoder *encoder, bool lock)
        else
                bios_6_scratch = RREG32(RADEON_BIOS_6_SCRATCH);
 
-       if (lock)
+       if (lock) {
                bios_6_scratch |= ATOM_S6_CRITICAL_STATE;
-       else
+               bios_6_scratch &= ~ATOM_S6_ACC_MODE;
+       } else {
                bios_6_scratch &= ~ATOM_S6_CRITICAL_STATE;
+               bios_6_scratch |= ATOM_S6_ACC_MODE;
+       }
 
        if (rdev->family >= CHIP_R600)
                WREG32(R600_BIOS_6_SCRATCH, bios_6_scratch);