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drm/i915: enable lvds pin pairs before dpll on gen2

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Otherwise things migt not work too well.

Breakage introduced in

commit eb1cbe4848
Author: Daniel Vetter <daniel.vetter@ffwll.ch>
Date:   Wed Mar 28 23:12:16 2012 +0200

    drm/i915: split PLL update code out of i9xx_crtc_mode_set

Cc: Jesse Barnes <jbarnes@virtuousgeek.org>
Cc: stable@vger.kernel.org (for 3.5 only)
Reviewed-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Daniel Vetter 2012-09-11 12:37:55 +02:00
parent 5698bd757d
commit 5b5896e4e1
1 changed files with 6 additions and 6 deletions
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12
drivers/gpu/drm/i915/intel_display.c
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@ -4191,12 +4191,6 @@ static void i8xx_update_pll(struct drm_crtc *crtc,
POSTING_READ(DPLL(pipe));
udelay(150);
I915_WRITE(DPLL(pipe), dpll);
/* Wait for the clocks to stabilize. */
POSTING_READ(DPLL(pipe));
udelay(150);
/* The LVDS pin pair needs to be on before the DPLLs are enabled.
* This is an exception to the general rule that mode_set doesn't turn
* things on.
@ -4204,6 +4198,12 @@ static void i8xx_update_pll(struct drm_crtc *crtc,
if (intel_pipe_has_type(crtc, INTEL_OUTPUT_LVDS))
intel_update_lvds(crtc, clock, adjusted_mode);
I915_WRITE(DPLL(pipe), dpll);
/* Wait for the clocks to stabilize. */
POSTING_READ(DPLL(pipe));
udelay(150);
/* The pixel multiplier can only be updated once the
* DPLL is enabled and the clocks are stable.
*