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drm/i915: Extract p2 divider correctly for gen2 LVDS dual channel

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In order to determine the correct p2 divider for LVDS on gen2,
we need to check the CLKB mode from the LVDS port register to
determine if we're dealing with single or dual channel LVDS.

Cc: Bruno Prémont <bonbons@linux-vserver.org>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Tested-by: Bruno Prémont <bonbons@linux-vserver.org>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Ville Syrjälä 2013-12-09 18:54:13 +02:00 committed by Daniel Vetter
parent 3dda20a974
commit b1c560d13d
1 changed files with 7 additions and 2 deletions
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9
drivers/gpu/drm/i915/intel_display.c
View file

@ -7951,12 +7951,17 @@ static void i9xx_crtc_clock_get(struct intel_crtc *crtc,
else
i9xx_clock(refclk, &clock);
} else {
bool is_lvds = (pipe == 1) && (I915_READ(LVDS) & LVDS_PORT_EN);
u32 lvds = I915_READ(LVDS);
bool is_lvds = (pipe == 1) && (lvds & LVDS_PORT_EN);
if (is_lvds) {
clock.p1 = ffs((dpll & DPLL_FPA01_P1_POST_DIV_MASK_I830_LVDS) >>
DPLL_FPA01_P1_POST_DIV_SHIFT);
clock.p2 = 14;
if (lvds & LVDS_CLKB_POWER_UP)
clock.p2 = 7;
else
clock.p2 = 14;
} else {
if (dpll & PLL_P1_DIVIDE_BY_TWO)
clock.p1 = 2;