[PATCH v2 0/4] amlogic: t7: give the MMC bus pipeline clock real consumers

[Lucas Tanure]

On 11/09/2026 16:40, Ulf Hansson wrote:
> On Sat, Sep 5, 2026 at 5:32 PM Lucas Tanure <tanure at linux.com> wrote:
>>
>> The previous series for the intermittent boot hangs on the VIM4
>> marked sys_ampipe_nand as critical. But as Chuan Liu from Amlogic
>> explained, sys_ampipe_nand clocks a pipeline stage that the
>> hardware design inserts in the bus path between the SD/eMMC
>> controllers and the NIC_MATRIX fabric to help timing closure.
>>
>> So the clock has real consumers: reference it from the three MMC
>> controller nodes and drop CLK_IS_CRITICAL instead.
>>
>> The series crosses three trees; patch 4 (clk) must only land after
>> patches 1-3, otherwise the DMA hangs fixed by 43e1705ecab9 come back.
>>
>> Changes since v1 [3]:
>>   - Dropped the Fixes: tag; this series is an improvement and should not
>>     be picked up by stable (Jerome Brunet)
>>   - Moved the patch 4 dependency note below the --- so it is not kept
>>     for posterity (Jerome Brunet)
>>   - Dropped the e-mail address from the Assisted-by trailer, see
>>     Documentation/process/coding-assistants.rst (Jerome Brunet)
>>   - Fixed the space-indented error path added to meson_mmc_probe() in
>>     patch 2, it did not pass checkpatch
>>   - Dropped the CLK_PIPELINE() macro from patch 2; has_pipeline_clk is a
>>     capability flag, not an SD_EMMC_CLOCK register field
>>
>> Thanks,
>> Lucas
>>
>> Lucas Tanure (4):
>>    dt-bindings: mmc: amlogic,meson-gx-mmc: document the T7 pipeline clock
>>    mmc: meson-gx: enable the bus pipeline clock on T7
>>    arm64: dts: amlogic: t7: add the pipeline clock to the MMC controllers
>>    clk: meson: t7: don't mark sys_ampipe_nand as critical
>>
>>   .../bindings/mmc/amlogic,meson-gx-mmc.yaml    | 29 ++++++++++++++++++-
>>   arch/arm64/boot/dts/amlogic/amlogic-t7.dtsi   | 15 ++++++----
>>   drivers/clk/meson/t7-peripherals.c            | 10 +++----
>>   drivers/mmc/host/meson-gx-mmc.c               | 20 +++++++++++++
>>   4 files changed, 62 insertions(+), 12 deletions(-)
>>
>> --
>> 2.55.0
>>
> 
> Patch 1 and patch2 applied for next, thanks!
> 
> Kind regards
> Uffe
Hi Neil,

Any chance you could queue patch 3 for this cycle? Patch 2 is already in
next, and until the DTS lands the MMC probe fails on T7 with "missing
pipeline clock".

Thanks
Lucas