drm/i915: Program SHPD_FILTER_CNT on CNP+

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The bspec tells us 'Program SHPD_FILTER_CNT with the "500 microseconds
adjusted" value before enabling hotplug detection' on CNP+.  We haven't
been touching this register at all thus far, but we should probably
follow the bspec's guidance.

The register also exists on LPT and SPT, but there isn't any specific
guidance I can find on how we should be programming it there so let's
leave it be for now.

Bspec: 4342
Bspec: 31297
Bspec: 8407
Bspec: 49305
Bspec: 50473

Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
Reviewed-by: José Roberto de Souza <jose.souza@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20191127221314.575575-3-matthew.d.roper@intel.com

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This commit is contained in:

Matt Roper 2019-11-27 14:13:14 -08:00

parent 3d1e388d40

commit f49108d0e0

2 changed files with 9 additions and 0 deletions

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5

drivers/gpu/drm/i915/i915_irq.c

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4

drivers/gpu/drm/i915/i915_reg.h

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