[Intel-gfx] [PATCH resend] drm/i915: Add support for dual-channel LVDS on 8xx.

[Bruno Prémont]

drm/i915: Check if BIOS enabled dual-channel LVDS on 8xx, not only on 9xx

Commit 0c2e39525b3b53a97a0202c5f35058147e53977e is not sufficient to
get fd.o bug #20115 fixed.
In addition intel_find_best_PLL() must not only rely on BIOS settings
for i9xx chips but also for i8xx, so drop the IS_I9XX() check.

Signed-off-by: Bruno Prémont <bonbons at linux-vserver.org>
--
Hi Eric, Ma Ling,

http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=0c2e39525b3b53a97a0202c5f35058147e53977e
(drm/i915: Add support for dual-channel LVDS on 8xx.) is not sufficient
for i8xx, below patch is needed too for LVDS to work on my Acer TM66x.

In case this is not appropriate for newer chips replacing IS_I9XX(dev)
with (IS_I9XX(dev) || IS_I85X(dev)) would be sufficient for me though
other i8xx variants would possibly need to be added too/later on.

Bruno
--
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index d6fce21..486bdaf 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -666,7 +666,7 @@ intel_find_best_PLL(const intel_limit_t *limit, struct drm_crtc *crtc,
 	intel_clock_t clock;
 	int err = target;
 
-	if (IS_I9XX(dev) && intel_pipe_has_type(crtc, INTEL_OUTPUT_LVDS) &&
+	if (intel_pipe_has_type(crtc, INTEL_OUTPUT_LVDS) &&
 	    (I915_READ(LVDS)) != 0) {
 		/*
 		 * For LVDS, if the panel is on, just rely on its
 		   current