Dhinakaran Pandiyan b1e314462b drm/i915/dp: Write to SET_POWER dpcd to enable MST hub. ... If bios sets up an MST output and hardware state readout code sees this is an SST configuration, when disabling the encoder we end up calling ->post_disable_dp() hook instead of the MST version. Consequently, we write to the DP_SET_POWER dpcd to set it D3 state. Further along when we try enable the encoder in MST mode, POWER_UP_PHY transaction fails to power up the MST hub. This results in continuous link training failures which keep the system busy delaying boot. We could identify bios MST boot discrepancy and handle it accordingly but a simple way to solve this is to write to the DP_SET_POWER dpcd for MST too. Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=105470 Cc: Ville Syrjälä <ville.syrjala@linux.intel.com> Cc: Jani Nikula <jani.nikula@intel.com> Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com> Reported-by: Laura Abbott <labbott@redhat.com> Cc: stable@vger.kernel.org Fixes: 5ea2355a10 ("drm/i915/mst: Use MST sideband message transactions for dpms control") Tested-by: Laura Abbott <labbott@redhat.com> Signed-off-by: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com> Signed-off-by: Jani Nikula <jani.nikula@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20180314054825.1718-1-dhinakaran.pandiyan@intel.com (cherry picked from commit ad260ab32a) Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>		2018-03-19 16:21:52 -07:00
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drm	drm/i915/dp: Write to SET_POWER dpcd to enable MST hub.	2018-03-19 16:21:52 -07:00
host1x	gpu: host1x: Use IOMMU groups	2017-12-21 14:52:36 +01:00
ipu-v3	gpu: ipu-csi: add 10/12-bit grayscale support to mbus_code_to_bus_cfg	2018-02-19 15:13:05 +01:00
vga	vfs: do bulk POLL* -> EPOLL* replacement	2018-02-11 14:34:03 -08:00
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