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drm/i915: Don't use link_bw for PLL setup

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Use port_clock instead of link_bw when picking the PLL parameters for
DP. link_bw may be zero with an eDP 1.4 sink that supports
DP_LINK_RATE_SET so we shouldn't use it for anything other than feed it
to the sink appropriately.

v2: Fix typo in commit message (Sivakumar)

Reviewed-by: Sivakumar Thulasimani <sivakumar.thulasimani@intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Ville Syrjälä
2015-08-11 20:21:46 +03:00
committed by Daniel Vetter
parent 0f2a2a756e
commit 840b32b7ed
2 changed files with 26 additions and 29 deletions
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11
drivers/gpu/drm/i915/intel_ddi.c
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@@ -1579,17 +1579,14 @@ skl_ddi_pll_select(struct intel_crtc *intel_crtc,
DPLL_CFGCR2_PDIV(wrpll_params.pdiv) |
wrpll_params.central_freq;
} else if (intel_encoder->type == INTEL_OUTPUT_DISPLAYPORT) {
struct drm_encoder *encoder = &intel_encoder->base;
struct intel_dp *intel_dp = enc_to_intel_dp(encoder);
switch (intel_dp->link_bw) {
case DP_LINK_BW_1_62:
switch (crtc_state->port_clock / 2) {
case 81000:
ctrl1 |= DPLL_CTRL1_LINK_RATE(DPLL_CTRL1_LINK_RATE_810, 0);
break;
case DP_LINK_BW_2_7:
case 135000:
ctrl1 |= DPLL_CTRL1_LINK_RATE(DPLL_CTRL1_LINK_RATE_1350, 0);
break;
case DP_LINK_BW_5_4:
case 270000:
ctrl1 |= DPLL_CTRL1_LINK_RATE(DPLL_CTRL1_LINK_RATE_2700, 0);
break;
}