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drm/i915: Don't read out port_clock on CHV when DPLL is disabled

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Check whether the DPLL is even enabled before readoing out the dividers
and trying to derive port_clock on CHV. We already did this on VLV.

Also remove the comment "MIPI" comment from the VLV code since we call
this function whenever the pipe is enabled.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1458052809-23426-9-git-send-email-ville.syrjala@linux.intel.com
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
This commit is contained in:
Ville Syrjälä 2016-03-15 16:40:01 +02:00
parent 7f7d8dd62c
commit b521973b45
1 changed files with 6 additions and 2 deletions
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8
drivers/gpu/drm/i915/intel_display.c
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@ -8009,8 +8009,8 @@ static void vlv_crtc_clock_get(struct intel_crtc *crtc,
u32 mdiv;
int refclk = 100000;
/* In case of MIPI DPLL will not even be used */
if (!(pipe_config->dpll_hw_state.dpll & DPLL_VCO_ENABLE))
/* In case of DSI, DPLL will not be used */
if ((pipe_config->dpll_hw_state.dpll & DPLL_VCO_ENABLE) == 0)
return;
mutex_lock(&dev_priv->sb_lock);
@ -8106,6 +8106,10 @@ static void chv_crtc_clock_get(struct intel_crtc *crtc,
u32 cmn_dw13, pll_dw0, pll_dw1, pll_dw2, pll_dw3;
int refclk = 100000;
/* In case of DSI, DPLL will not be used */
if ((pipe_config->dpll_hw_state.dpll & DPLL_VCO_ENABLE) == 0)
return;
mutex_lock(&dev_priv->sb_lock);
cmn_dw13 = vlv_dpio_read(dev_priv, pipe, CHV_CMN_DW13(port));
pll_dw0 = vlv_dpio_read(dev_priv, pipe, CHV_PLL_DW0(port));