drm/radeon/kms: enable ACPI powermanagement mode on radeon gpus.
Some GPUs have an APM/ACPI PM mode selection switch and some BIOSes
set this to APM. We really want this in ACPI mode for Linux.
Signed-off-by: Dave Airlie <airlied@redhat.com>
diff --git a/drivers/gpu/drm/radeon/r100.c b/drivers/gpu/drm/radeon/r100.c
index c8f4b03..3ae51ad 100644
--- a/drivers/gpu/drm/radeon/r100.c
+++ b/drivers/gpu/drm/radeon/r100.c
@@ -1809,6 +1809,7 @@
{
struct drm_device *dev = rdev->ddev;
bool force_dac2 = false;
+ u32 tmp;
/* set these so they don't interfere with anything */
WREG32(RADEON_OV0_SCALE_CNTL, 0);
@@ -1880,6 +1881,12 @@
WREG32(RADEON_DISP_HW_DEBUG, disp_hw_debug);
WREG32(RADEON_DAC_CNTL2, dac2_cntl);
}
+
+ /* switch PM block to ACPI mode */
+ tmp = RREG32_PLL(RADEON_PLL_PWRMGT_CNTL);
+ tmp &= ~RADEON_PM_MODE_SEL;
+ WREG32_PLL(RADEON_PLL_PWRMGT_CNTL, tmp);
+
}
/*
diff --git a/drivers/gpu/drm/radeon/radeon_reg.h b/drivers/gpu/drm/radeon/radeon_reg.h
index 5c0dc08..eabbc9c 100644
--- a/drivers/gpu/drm/radeon/radeon_reg.h
+++ b/drivers/gpu/drm/radeon/radeon_reg.h
@@ -346,6 +346,7 @@
# define RADEON_TVPLL_PWRMGT_OFF (1 << 30)
# define RADEON_TVCLK_TURNOFF (1 << 31)
#define RADEON_PLL_PWRMGT_CNTL 0x0015 /* PLL */
+# define RADEON_PM_MODE_SEL (1 << 13)
# define RADEON_TCL_BYPASS_DISABLE (1 << 20)
#define RADEON_CLR_CMP_CLR_3D 0x1a24
#define RADEON_CLR_CMP_CLR_DST 0x15c8