[v3,0/3] MediaTek clocks: Support mux indices list and 8195 DP

Message

AngeloGioacchino Del Regno Nov. 3, 2023, 10:25 a.m. UTC

Changes in v3:
 - Rebased on next-20231025
 - Added comment in the code explaining why the dp/edp parents lists
   are split in one PLL per interface
 - Added a commit performing the same reparenting on MT8188 as well

Changes in v2:
 - Rebased on next-20231018

This series adds support to specify custom parent indices for MediaTek
MUX clocks, necessary to avoid setting the same parent PLL for MT8195's
top_dp and top_edp clocks, solving DP+eDP concurrent output issues.

No fixes tags are provided as the clk-mux commit introduces new logic
and the actual MT8195 fix depends on that.

This commit was tested on the Acer Tomato Chromebook (MT8195) with
dual concurrent display outputs (internal eDP panel and TypeC->DP->HDMI
adapter connected to Samsung UE40JU6400 4k TV); resolution switch on
DP was also tested; eDP output is not paused and internal display keeps
working as expected.


After feedback on v1 of this series (effectively the same as v2, except
for the rebase), I looked for an alternative solution with using
clk_set_rate_exclusive() as proposed. Couldn't find any, as that still
doesn't give any guarantee about selecting the same PLL that the driver
was manipulating before setting the right divider MUX, hence that still
wouldn't work correctly.

For more context, please look at the conversation at [1].

Cheers!

[1] https://lore.kernel.org/linux-arm-kernel/[e-mail]

AngeloGioacchino Del Regno (3):
  clk: mediatek: clk-mux: Support custom parent indices for muxes
  clk: mediatek: mt8195-topckgen: Refactor parents for top_dp/edp muxes
  clk: mediatek: mt8188-topckgen: Refactor parents for top_dp/edp muxes

 drivers/clk/mediatek/clk-mt8188-topckgen.c | 27 +++++++-------
 drivers/clk/mediatek/clk-mt8195-topckgen.c | 27 ++++++++++----
 drivers/clk/mediatek/clk-mux.c             | 14 +++++++
 drivers/clk/mediatek/clk-mux.h             | 43 ++++++++++++++++++++--
 4 files changed, 86 insertions(+), 25 deletions(-)

Comments

AngeloGioacchino Del Regno Dec. 20, 2023, 2:02 p.m. UTC | #1

Il 03/11/23 11:25, AngeloGioacchino Del Regno ha scritto:
> Changes in v3:
>   - Rebased on next-20231025
>   - Added comment in the code explaining why the dp/edp parents lists
>     are split in one PLL per interface
>   - Added a commit performing the same reparenting on MT8188 as well
> 
> Changes in v2:
>   - Rebased on next-20231018
> 

Hello Stephen,

friendly ping for this fully reviewed/tested series :-)

Cheers,
Angelo

> This series adds support to specify custom parent indices for MediaTek
> MUX clocks, necessary to avoid setting the same parent PLL for MT8195's
> top_dp and top_edp clocks, solving DP+eDP concurrent output issues.
> 
> No fixes tags are provided as the clk-mux commit introduces new logic
> and the actual MT8195 fix depends on that.
> 
> This commit was tested on the Acer Tomato Chromebook (MT8195) with
> dual concurrent display outputs (internal eDP panel and TypeC->DP->HDMI
> adapter connected to Samsung UE40JU6400 4k TV); resolution switch on
> DP was also tested; eDP output is not paused and internal display keeps
> working as expected.
> 
> 
> After feedback on v1 of this series (effectively the same as v2, except
> for the rebase), I looked for an alternative solution with using
> clk_set_rate_exclusive() as proposed. Couldn't find any, as that still
> doesn't give any guarantee about selecting the same PLL that the driver
> was manipulating before setting the right divider MUX, hence that still
> wouldn't work correctly.
> 
> For more context, please look at the conversation at [1].
> 
> Cheers!
> 
> [1] https://lore.kernel.org/linux-arm-kernel/[e-mail]
> 
> AngeloGioacchino Del Regno (3):
>    clk: mediatek: clk-mux: Support custom parent indices for muxes
>    clk: mediatek: mt8195-topckgen: Refactor parents for top_dp/edp muxes
>    clk: mediatek: mt8188-topckgen: Refactor parents for top_dp/edp muxes
> 
>   drivers/clk/mediatek/clk-mt8188-topckgen.c | 27 +++++++-------
>   drivers/clk/mediatek/clk-mt8195-topckgen.c | 27 ++++++++++----
>   drivers/clk/mediatek/clk-mux.c             | 14 +++++++
>   drivers/clk/mediatek/clk-mux.h             | 43 ++++++++++++++++++++--
>   4 files changed, 86 insertions(+), 25 deletions(-)
>