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drm/radeon/dce8: workaround for atom BlankCrtc table 

Some DCE8 boards have a funky BlankCrtc table that results
in a timeout when trying to blank the display.  The
timeout is harmless (all operations needed from the table
are complete), but wastes time and is confusing to users so
work around it.

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 2014-01-28 23:49:37 -05:00
parent 6802d4bad8
commit 78fe9e545c
1 changed files with 20 additions and 0 deletions
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20
drivers/gpu/drm/radeon/atombios_crtc.c
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@ -209,6 +209,16 @@ static void atombios_enable_crtc_memreq(struct drm_crtc *crtc, int state)
atom_execute_table(rdev->mode_info.atom_context, index, (uint32_t *)&args);
}
static const u32 vga_control_regs[6] =
{
AVIVO_D1VGA_CONTROL,
AVIVO_D2VGA_CONTROL,
EVERGREEN_D3VGA_CONTROL,
EVERGREEN_D4VGA_CONTROL,
EVERGREEN_D5VGA_CONTROL,
EVERGREEN_D6VGA_CONTROL,
};
static void atombios_blank_crtc(struct drm_crtc *crtc, int state)
{
struct radeon_crtc *radeon_crtc = to_radeon_crtc(crtc);
@ -216,13 +226,23 @@ static void atombios_blank_crtc(struct drm_crtc *crtc, int state)
struct radeon_device *rdev = dev->dev_private;
int index = GetIndexIntoMasterTable(COMMAND, BlankCRTC);
BLANK_CRTC_PS_ALLOCATION args;
u32 vga_control = 0;
memset(&args, 0, sizeof(args));
if (ASIC_IS_DCE8(rdev)) {
vga_control = RREG32(vga_control_regs[radeon_crtc->crtc_id]);
WREG32(vga_control_regs[radeon_crtc->crtc_id], vga_control | 1);
}
args.ucCRTC = radeon_crtc->crtc_id;
args.ucBlanking = state;
atom_execute_table(rdev->mode_info.atom_context, index, (uint32_t *)&args);
if (ASIC_IS_DCE8(rdev)) {
WREG32(vga_control_regs[radeon_crtc->crtc_id], vga_control);
}
}
static void atombios_powergate_crtc(struct drm_crtc *crtc, int state)