From: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
The current gen2 DPLL readout code:
* assumes i845/i865 have LVDS which is not true
* assumes only pipe B can drive LVDS (true, but makes
the code appear a bit magical)
* hard to parse in general
Clean it up by checking for i85x (the only gen2 platform
with LVDS) and reusing intel_lvds_port_enabled().
Cc: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxxxxxxxx>
Signed-off-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
---
drivers/gpu/drm/i915/intel_display.c | 10 ++++++----
1 file changed, 6 insertions(+), 4 deletions(-)
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 2ba61181746d..9f31d94fc04b 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -10809,7 +10809,6 @@ static void i9xx_crtc_clock_get(struct intel_crtc *crtc,
{
struct drm_device *dev = crtc->base.dev;
struct drm_i915_private *dev_priv = to_i915(dev);
- int pipe = pipe_config->cpu_transcoder;
u32 dpll = pipe_config->dpll_hw_state.dpll;
u32 fp;
struct dpll clock;
@@ -10858,10 +10857,13 @@ static void i9xx_crtc_clock_get(struct intel_crtc *crtc,
else
port_clock = i9xx_calc_dpll_params(refclk, &clock);
} else {
- u32 lvds = IS_I830(dev_priv) ? 0 : I915_READ(LVDS);
- bool is_lvds = (pipe == 1) && (lvds & LVDS_PORT_EN);
+ enum pipe lvds_pipe;
+
+ if (IS_I85X(dev_priv) &&
+ intel_lvds_port_enabled(dev_priv, LVDS, &lvds_pipe) &&
+ lvds_pipe == crtc->pipe) {
+ u32 lvds = I915_READ(LVDS);
- if (is_lvds) {
clock.p1 = ffs((dpll & DPLL_FPA01_P1_POST_DIV_MASK_I830_LVDS) >>
DPLL_FPA01_P1_POST_DIV_SHIFT);
--
2.19.2
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