On Wed, 02 Mar 2016, ville.syrjala@xxxxxxxxxxxxxxx wrote:
> From: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
>
> Currently we assume that hrawclk is 200MHz on VLV/CHV. That should
> be true always, but just to avoid such asumptions we can read out the
> actual frequency from CCK.
Okay, so I don't want to spend forever looking for the spec section
where I can verify this... please just pinpoint me the location. ;)
And whenever I see "that should be true always", I feel like there
should be a WARN_ON(*gasp* it's not true this time!)...
BR,
Jani.
>
> Signed-off-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
> ---
> drivers/gpu/drm/i915/i915_reg.h | 1 +
> drivers/gpu/drm/i915/intel_display.c | 3 ++-
> 2 files changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
> index 71abf5725495..c4606c7ad8d6 100644
> --- a/drivers/gpu/drm/i915/i915_reg.h
> +++ b/drivers/gpu/drm/i915/i915_reg.h
> @@ -786,6 +786,7 @@ enum skl_disp_power_wells {
> #define DSI_PLL_M1_DIV_MASK (0x1ff << 0)
> #define CCK_CZ_CLOCK_CONTROL 0x62
> #define CCK_DISPLAY_CLOCK_CONTROL 0x6b
> +#define CCK_DISPLAY_REF_CLOCK_CONTROL 0x6c
> #define CCK_TRUNK_FORCE_ON (1 << 17)
> #define CCK_TRUNK_FORCE_OFF (1 << 16)
> #define CCK_FREQUENCY_STATUS (0x1f << 8)
> diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> index 330528c1fb28..f5a757bec3f7 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -178,7 +178,8 @@ intel_pch_rawclk(struct drm_i915_private *dev_priv)
> static int
> intel_vlv_hrawclk(struct drm_i915_private *dev_priv)
> {
> - return 200000;
> + return vlv_get_cck_clock_hpll(dev_priv, "hrawclk",
> + CCK_DISPLAY_REF_CLOCK_CONTROL);
> }
>
> static int
--
Jani Nikula, Intel Open Source Technology Center
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