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/evergreen.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/evergreen.c')
| -rw-r--r-- | drivers/gpu/drm/radeon/evergreen.c | 22 |
1 files changed, 14 insertions, 8 deletions
diff --git a/drivers/gpu/drm/radeon/evergreen.c b/drivers/gpu/drm/radeon/evergreen.c index d425a4fa010..0af36e7731e 100644 --- a/drivers/gpu/drm/radeon/evergreen.c +++ b/drivers/gpu/drm/radeon/evergreen.c @@ -189,6 +189,20 @@ int evergreen_set_uvd_clocks(struct radeon_device *rdev, u32 vclk, u32 dclk) unsigned vco_freq; int r; + /* 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)); + + /* put PLL in bypass mode */ + WREG32_P(CG_UPLL_FUNC_CNTL, UPLL_BYPASS_EN_MASK, ~UPLL_BYPASS_EN_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 */ for (vco_freq = 125000; vco_freq <= 250000; vco_freq += 100) { unsigned fb_div = vco_freq / rdev->clock.spll.reference_freq * 16384; @@ -236,14 +250,6 @@ int evergreen_set_uvd_clocks(struct radeon_device *rdev, u32 vclk, u32 dclk) mdelay(1); - /* 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)); - - /* put PLL in bypass mode */ - WREG32_P(CG_UPLL_FUNC_CNTL, UPLL_BYPASS_EN_MASK, ~UPLL_BYPASS_EN_MASK); - r = evergreen_uvd_send_upll_ctlreq(rdev); if (r) return r; |