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>
diff --git a/drivers/gpu/drm/radeon/rv770.c b/drivers/gpu/drm/radeon/rv770.c
index 777f537..59065ba 100644
--- a/drivers/gpu/drm/radeon/rv770.c
+++ b/drivers/gpu/drm/radeon/rv770.c
@@ -100,6 +100,17 @@
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 @@
}
}
- /* 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);