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| author |   Ville Syrjälä <ville.syrjala@linux.intel.com> | 2019-06-04 23:09:33 +0300 |
|---|---|---|
| committer | Ville Syrjälä <ville.syrjala@linux.intel.com> | 2019-06-12 14:49:47 +0300 |
| commit | 86761789b38a90ee56d455b81d534ac65e8a2b8b (patch) | |
| tree | 3d92e733f5ec6a45fce7a7be87c69bb51dd066b7 /drivers/gpu/drm/i915/i915_reg.h | |
| parent | drm/i915: Assert that HSW/BDW LCPLL is using the non-SSC reference (diff) | |
| download | linux-dev-86761789b38a90ee56d455b81d534ac65e8a2b8b.tar.xz linux-dev-86761789b38a90ee56d455b81d534ac65e8a2b8b.zip | |
drm/i915: Improve WRPLL reference clock readout on HSW/BDW
On non-ULT HSW the "special" WRPLL reference clock select
actually means non-SSC. Take that into account when reading
out the WRPLL state.
Also the non-SSC reference may be either 24MHz or 135MHz,
which we can read out from FUSE_STRAP3. The BDW docs actually
say: "also indicates whether the CPU and PCH are in a single
package or separate packages", so it may be that this is not
actually required and we could just assume 135 MHz (just like
the code already did). But it doesn't really hurt to read this
out as the HSW docs aren't quite so clear.
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190604200933.29417-5-ville.syrjala@linux.intel.com
Reviewed-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Diffstat (limited to 'drivers/gpu/drm/i915/i915_reg.h')
| -rw-r--r-- | drivers/gpu/drm/i915/i915_reg.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h index 665dfc177528..d0c262367f09 100644 --- a/drivers/gpu/drm/i915/i915_reg.h +++ b/drivers/gpu/drm/i915/i915_reg.h @@ -7514,6 +7514,9 @@ enum { #define ILK_DESKTOP (1 << 23) #define HSW_CPU_SSC_ENABLE (1 << 21) +#define FUSE_STRAP3 _MMIO(0x42020) +#define HSW_REF_CLK_SELECT (1 << 1) + #define ILK_DSPCLK_GATE_D _MMIO(0x42020) #define ILK_VRHUNIT_CLOCK_GATE_DISABLE (1 << 28) #define ILK_DPFCUNIT_CLOCK_GATE_DISABLE (1 << 9) |