lkml.org 
[lkml]   [2022]   [May]   [20]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
Subject[PATCH 0/4] clk: mediatek: mt8183: Fix GPU/MFG clock rate changing
Date
Hi everyone,

This series fixes the clock rate changing for the GPU. This work came
about as part of adding DVFS support for the Mali GPU on MT8183, to
support efforts in testing the SVS patches [1] on MT8183.

This series fixes a couple things:

1. Fix the clock reference for the GPU. The device tree incorrectly
references the top level PLL, when in fact it is fed from the clock
gate in the MFGCFG block. Fixed in patch 1.

2. Clock rate requests on the MFG clock gate aren't propagated up the
tree. Fixed in patch 2 by adding CLK_SET_RATE_PARENT.

3. MFG clock needs to be temporarily muxed away from MFG PLL during PLL
reconfiguration, to avoid glitches. This is done using a notifier.
The framework is added in patch 3, and added to the driver in patch 4.

This is based on my "clk: mediatek: Move to struct clk_hw provider APIs"
series version 3 [2], which was just merged.

Please have a look.

The GPU DVFS stuff will be sent separately, as that part is a bit more
contentious, and the changes span more subsystems.


Regards
ChenYu

[1] https://lore.kernel.org/linux-mediatek/20220516004311.18358-1-roger.lu@mediatek.com/
[2] https://lore.kernel.org/linux-mediatek/20220519071610.423372-1-wenst@chromium.org/

Chen-Yu Tsai (4):
arm64: dts: mt8183: Fix Mali GPU clock
clk: mediatek: mt8183: mfgcfg: Propagate rate changes to parent
clk: mediatek: mux: add clk notifier functions
clk: mediatek: mt8183: Add clk mux notifier for MFG mux

arch/arm64/boot/dts/mediatek/mt8183.dtsi | 2 +-
drivers/clk/mediatek/clk-mt8183-mfgcfg.c | 6 ++--
drivers/clk/mediatek/clk-mt8183.c | 21 ++++++++++++
drivers/clk/mediatek/clk-mux.c | 42 ++++++++++++++++++++++++
drivers/clk/mediatek/clk-mux.h | 15 +++++++++
5 files changed, 82 insertions(+), 4 deletions(-)

--
2.36.1.124.g0e6072fb45-goog

\
 
 \ /
  Last update: 2022-05-20 11:45    [W:1.220 / U:0.004 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site