drm/i915: Preserve the FDI line reversal override bit on CPT

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The FDI link has supported link reversal to make the PCB layout
engineer's life easier for quite a while and we have always presered
this bit as we programmed FDI_RX_CTL with a read/modify/write sequence.

We're trying to take a bit more control over what the BIOS leaves in
various register and with the introduction of DDI, started to program
FDI_RX_CTL fully.

There's a fused bit to indicate DMI link reversal and FDI defaults to
mirroring that configuration. We have a bit to override that behaviour
that we need to preserve from the BIOS.

Signed-off-by: Damien Lespiau <damien.lespiau@intel.com>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@gmail.com>
Reviewed-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Cc: stable@vger.kernel.org
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

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This commit is contained in:

Damien Lespiau 2012-12-11 18:48:29 +00:00 • committed by Daniel Vetter

parent fdfa175d0a

commit 3e68320ef8

4 changed files with 13 additions and 11 deletions

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2

drivers/gpu/drm/i915/i915_drv.h

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2

drivers/gpu/drm/i915/i915_reg.h

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14

drivers/gpu/drm/i915/intel_crt.c

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6

drivers/gpu/drm/i915/intel_ddi.c

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