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)
Cc: Imre Deak <imre.deak@xxxxxxxxx>
Cc: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
Signed-off-by: Shobhit Kumar <shobhit.kumar@xxxxxxxxx>
---
drivers/gpu/drm/i915/intel_ddi.c | 12 ++++++++----
drivers/gpu/drm/i915/intel_display.c | 31 +++++++++++++++++++++++++++++++
drivers/gpu/drm/i915/intel_drv.h | 1 +
3 files changed, 40 insertions(+), 4 deletions(-)
diff --git a/drivers/gpu/drm/i915/intel_ddi.c b/drivers/gpu/drm/i915/intel_ddi.c
index b25e99a..86d43e6 100644
--- a/drivers/gpu/drm/i915/intel_ddi.c
+++ b/drivers/gpu/drm/i915/intel_ddi.c
@@ -2949,10 +2949,14 @@ 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");
- else
- intel_display_power_get(dev_priv, POWER_DOMAIN_PLLS);
+ if (skl_sanitize_cdclk(dev_priv))
+ DRM_DEBUG_KMS("Sanitized cdclk programmed by pre-os\n");
+ else {
+ if (!(I915_READ(LCPLL1_CTL) & LCPLL_PLL_ENABLE))
+ DRM_ERROR("LCPLL1 is disabled\n");
+ else
+ intel_display_power_get(dev_priv, POWER_DOMAIN_PLLS);
+ }
} else if (IS_BROXTON(dev)) {
broxton_init_cdclk(dev);
broxton_ddi_phy_init(dev);
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 5f37f84..98333d3 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -5784,6 +5784,37 @@ 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 = 675000;
+ 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)
{
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index 0598932..ec10e6a 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -1152,6 +1152,7 @@ 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 intel_dp_get_m_n(struct intel_crtc *crtc,
struct intel_crtc_state *pipe_config);
--
2.4.3
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