mbox series

[0/2,SRU,G] Support WD19TB external output on TGL platform

Message ID 20200910052736.314874-1-shane.lin@canonical.com
Headers show
Series Support WD19TB external output on TGL platform | expand

Message

Hsuan-Yu Lin Sept. 10, 2020, 5:27 a.m. UTC 
BugLink: https://bugs.launchpad.net/bugs/1886165

[Impact]
TGL platform can't output external monitor on WD19TB docking.
There's no screen on the external monitor.
error in dmesg:

[drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe B FIFO underru

[Fix]
According to Intel's suggestion,
we need this: https://patchwork.freedesktop.org/series/78909/
The following patches are landed in 5.9-rc1
and necessary for support TGL platform:

* commit 09eac8277262 ("drm/i915/tgl+: Fix TBT DPLL fractional divider for 38.4MHz ref clock")
* commit f153478de4b2 ("drm/i915/tgl+: Use the correct DP_TP_* register instances in MST encoders")

[Test]
The WD19TB can output HDMI/DP to external monitor.

[Regression Potential]
Low, it's the fixes for TGL platform, doesn't affect other platforms.

Imre Deak (2):
  drm/i915/tgl+: Use the correct DP_TP_* register instances in MST
    encoders
  drm/i915/tgl+: Fix TBT DPLL fractional divider for 38.4MHz ref clock

 drivers/gpu/drm/i915/display/intel_ddi.c      | 15 ++++++++++-----
 drivers/gpu/drm/i915/display/intel_dpll_mgr.c | 13 ++++++++++++-
 2 files changed, 22 insertions(+), 6 deletions(-)

Comments

Paolo Pisati Sept. 10, 2020, 8:33 a.m. UTC | #1 
On Thu, Sep 10, 2020 at 01:27:34PM +0800, Hsuan-Yu Lin wrote:
> BugLink: https://bugs.launchpad.net/bugs/1886165

Acked-by: Paolo Pisati <paolo.pisati@canonical.com>