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drm/i915/skl: If needed sanitize bios programmed cdclk

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Especially in cases where pre-os does not enable display, cdclk might
not be in sane state. During sanitization initialize cdclk with maximum
value till we get dynamic cdclk support.

v2: Check if BIOS programmed correctly rather than always calling init
    - Do validation of programmed cdctl and what it is expected
    - Only do slk_init_cdclk if validation failed else reuse BIOS
      programmed value

v3: Move the validation logic in a separate sanitize function (Ville)

v4: No need to check LCPLL after sanitize and use max_cdclk_freq instead
    of hardcoded value (Ville)

Cc: Imre Deak <imre.deak@intel.com>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Shobhit Kumar <shobhit.kumar@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1445344992-14658-1-git-send-email-shobhit.kumar@intel.com
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Shobhit Kumar 2015-10-20 18:13:12 +05:30 committed by Daniel Vetter
parent fbcc1a0c3e
commit c73666f394
3 changed files with 34 additions and 2 deletions
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4
drivers/gpu/drm/i915/intel_ddi.c
View file

@ -2949,8 +2949,8 @@ void intel_ddi_pll_init(struct drm_device *dev)
cdclk_freq = dev_priv->display.get_display_clock_speed(dev);
dev_priv->skl_boot_cdclk = cdclk_freq;
if (!(I915_READ(LCPLL1_CTL) & LCPLL_PLL_ENABLE))
DRM_ERROR("LCPLL1 is disabled\n");
if (skl_sanitize_cdclk(dev_priv))
DRM_DEBUG_KMS("Sanitized cdclk programmed by pre-os\n");
else
intel_display_power_get(dev_priv, POWER_DOMAIN_PLLS);
} else if (IS_BROXTON(dev)) {

31
drivers/gpu/drm/i915/intel_display.c
View file

@ -5760,6 +5760,37 @@ void skl_init_cdclk(struct drm_i915_private *dev_priv)
DRM_ERROR("DBuf power enable timeout\n");
}
int skl_sanitize_cdclk(struct drm_i915_private *dev_priv)
{
uint32_t lcpll1 = I915_READ(LCPLL1_CTL);
uint32_t cdctl = I915_READ(CDCLK_CTL);
int freq = dev_priv->skl_boot_cdclk;
/* Is PLL enabled and locked ? */
if (!((lcpll1 & LCPLL_PLL_ENABLE) && (lcpll1 & LCPLL_PLL_LOCK)))
goto sanitize;
/* DPLL okay; verify the cdclock
*
* Noticed in some instances that the freq selection is correct but
* decimal part is programmed wrong from BIOS where pre-os does not
* enable display. Verify the same as well.
*/
if (cdctl == ((cdctl & CDCLK_FREQ_SEL_MASK) | skl_cdclk_decimal(freq)))
/* All well; nothing to sanitize */
return false;
sanitize:
/*
* As of now initialize with max cdclk till
* we get dynamic cdclk support
* */
dev_priv->skl_boot_cdclk = dev_priv->max_cdclk_freq;
skl_init_cdclk(dev_priv);
/* we did have to sanitize */
return true;
}
/* Adjust CDclk dividers to allow high res or save power if possible */
static void valleyview_set_cdclk(struct drm_device *dev, int cdclk)
{

1
drivers/gpu/drm/i915/intel_drv.h
View file

@ -1151,6 +1151,7 @@ void broxton_ddi_phy_uninit(struct drm_device *dev);
void bxt_enable_dc9(struct drm_i915_private *dev_priv);
void bxt_disable_dc9(struct drm_i915_private *dev_priv);
void skl_init_cdclk(struct drm_i915_private *dev_priv);
int skl_sanitize_cdclk(struct drm_i915_private *dev_priv);
void skl_uninit_cdclk(struct drm_i915_private *dev_priv);
void skl_enable_dc6(struct drm_i915_private *dev_priv);
void skl_disable_dc6(struct drm_i915_private *dev_priv);