diff options
| author | Christian König <christian.koenig@amd.com> | 2013-04-18 15:25:58 +0200 |
|---|---|---|
| committer | Alex Deucher <alexander.deucher@amd.com> | 2013-04-22 10:39:16 -0400 |
| commit | 4ed108352d9b60a723a5071ed05e722826c2b72f (patch) | |
| tree | d2f1500ca5a72b79d073770f28916d68d37a91fa /drivers/gpu/drm/radeon/rv770.c | |
| parent | 9054ae1ce33f08315616999c742e6656b9967724 (diff) | |
drm/radeon: put UVD PLLs in bypass mode
Just power down the PLL when we get a VCLK or DCLK of zero.
Enabling the bypass mode early should also allow us to
switch UVD clocks on the fly.
Signed-off-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Diffstat (limited to 'drivers/gpu/drm/radeon/rv770.c')
| -rw-r--r-- | drivers/gpu/drm/radeon/rv770.c | 20 |
1 files changed, 13 insertions, 7 deletions
diff --git a/drivers/gpu/drm/radeon/rv770.c b/drivers/gpu/drm/radeon/rv770.c index 777f537a32c7..59065ba7c342 100644 --- a/drivers/gpu/drm/radeon/rv770.c +++ b/drivers/gpu/drm/radeon/rv770.c @@ -100,6 +100,17 @@ int rv770_set_uvd_clocks(struct radeon_device *rdev, u32 vclk, u32 dclk) if (rdev->family == CHIP_RV740) return evergreen_set_uvd_clocks(rdev, vclk, dclk); + /* bypass vclk and dclk with bclk */ + WREG32_P(CG_UPLL_FUNC_CNTL_2, + VCLK_SRC_SEL(1) | DCLK_SRC_SEL(1), + ~(VCLK_SRC_SEL_MASK | DCLK_SRC_SEL_MASK)); + + if (!vclk || !dclk) { + /* keep the Bypass mode, put PLL to sleep */ + WREG32_P(CG_UPLL_FUNC_CNTL, UPLL_SLEEP_MASK, ~UPLL_SLEEP_MASK); + return 0; + } + /* loop through vco from low to high */ vco_min = max(max(vco_min, vclk), dclk); for (vco_freq = vco_min; vco_freq <= vco_max; vco_freq += 500) { @@ -139,16 +150,11 @@ int rv770_set_uvd_clocks(struct radeon_device *rdev, u32 vclk, u32 dclk) } } - /* bypass vclk and dclk with bclk */ - WREG32_P(CG_UPLL_FUNC_CNTL_2, - VCLK_SRC_SEL(1) | DCLK_SRC_SEL(1), - ~(VCLK_SRC_SEL_MASK | DCLK_SRC_SEL_MASK)); - /* set UPLL_FB_DIV to 0x50000 */ WREG32_P(CG_UPLL_FUNC_CNTL_3, UPLL_FB_DIV(0x50000), ~UPLL_FB_DIV_MASK); - /* deassert UPLL_RESET */ - WREG32_P(CG_UPLL_FUNC_CNTL, 0, ~UPLL_RESET_MASK); + /* deassert UPLL_RESET and UPLL_SLEEP */ + WREG32_P(CG_UPLL_FUNC_CNTL, 0, ~(UPLL_RESET_MASK | UPLL_SLEEP_MASK)); /* assert BYPASS EN and FB_DIV[0] <- ??? why? */ WREG32_P(CG_UPLL_FUNC_CNTL, UPLL_BYPASS_EN_MASK, ~UPLL_BYPASS_EN_MASK); |