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Various TDA19988 fixes #1821

Merged
merged 4 commits into from
Sep 5, 2023
Merged

Various TDA19988 fixes #1821

merged 4 commits into from
Sep 5, 2023

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jrtc27
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@jrtc27 jrtc27 commented Aug 29, 2023

  • tda19988: Implement a non-stub mode_valid to filter unsupported resolutions
  • tda19988: Properly implement mode_set/bridge_enable/bridge_disable flow
  • tda19988: Fix divisor calculation
  • komeda: Drop temporary resolution hack

jrtc27 and others added 4 commits August 29, 2023 21:35
@jrtc27
tda19988: Implement a non-stub mode_valid to filter unsupported resol…
a2bbba0 
…utions
@jrtc27 @bukinr
tda19988: Properly implement mode_set/bridge_enable/bridge_disable flow
e227dac 
Otherwise, when SDDM tries to put the display to sleep, we don't disable
the output and end up outputting a garbled picture, where the amount of
garbling increases with system activity.

Co-authored-by: Ruslan Bukin <[email protected]>
@jrtc27
tda19988: Fix divisor calculation
d7c2cf6 
The existing calculation was linear with a fixup to make it non-linear
(and, correctly, cap it at 3). However, the actual value is logarithmic
and this ended up generating bad values in the following ranges:

* [20000, 37125] - gave a divisor of 3 not 2
* [40000, 49500] - gave a divisor of 2 not 1
* [74251, 79999] - gave a divisor of 0 not 1
@jrtc27
komeda: Drop temporary resolution hack
068b1e9 
This was presumably an attempt to work around not having properly
implemented mode_valid in the tda19988 driver.
bsdjhb
bsdjhb reviewed Aug 29, 2023
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Confirmed that this does allow my monitor to go to sleep at sddm.

bsdjhb
bsdjhb reviewed Aug 29, 2023
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I assume this supplants #1618 btw since the second commit here is a squash of that?

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jrtc27 commented Aug 29, 2023 •
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I assume this supplants #1618 btw since the second commit here is a squash of that?

Partially. This doesn't change anything for komeda. And I wrote it from scratch (other than the enable / disable bits, which is what the Co-authored-by is for), so it's slightly different (e.g. mode vs adjusted_mode).

kwitaszczyk
kwitaszczyk approved these changes Aug 31, 2023
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I confirm this patch works correctly on my screen - ASUS ProArt Display PA148CTV. Instead of displaying garbage, the screen sleeps due to inactivity in sddm.

@jrtc27 jrtc27 mentioned this pull request Aug 31, 2023
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@bsdjhb bsdjhb merged commit a47d2fe into dev Sep 5, 2023
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@bsdjhb bsdjhb deleted the tda19988-fixes branch September 5, 2023 22:45
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@kwitaszczyk kwitaszczyk kwitaszczyk approved these changes

@arichardson arichardson Awaiting requested review from arichardson

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3 participants
@jrtc27 @bsdjhb @kwitaszczyk