[PATCH v4 1/5] clk: sunxi-ng: common: Support minimum and maximum rate

[Linux regression tracking (Thorsten Leemhuis)]

On 23.05.24 20:58, Måns Rullgård wrote:
> Måns Rullgård <mans at mansr.com> writes:
>> Frank Oltmanns <frank at oltmanns.dev> writes:
>>> 21.05.2024 15:43:10 Måns Rullgård <mans at mansr.com>:
>>>> Frank Oltmanns <frank at oltmanns.dev> writes:
>>>>
>>>>> The Allwinner SoC's typically have an upper and lower limit for their
>>>>> clocks' rates. Up until now, support for that has been implemented
>>>>> separately for each clock type.
>>>>>
>>>>> Implement that functionality in the sunxi-ng's common part making use of
>>>>> the CCF rate liming capabilities, so that it is available for all clock
>>>>> types.
>>>>>
>>>>> Suggested-by: Maxime Ripard <mripard at kernel.org>
>>>>> Signed-off-by: Frank Oltmanns <frank at oltmanns.dev>
>>>>> Cc: stable at vger.kernel.org
>>>>> ---
>>>>> drivers/clk/sunxi-ng/ccu_common.c | 19 +++++++++++++++++++
>>>>> drivers/clk/sunxi-ng/ccu_common.h |  3 +++
>>>>> 2 files changed, 22 insertions(+)
>>>>
>>>> This just landed in 6.6 stable, and it broke HDMI output on an A20 based
>>>> device, the clocks ending up all wrong as seen in this diff of
>>>> /sys/kernel/debug/clk/clk_summary:
> [...]
> 
>>>> Reverting this commit makes it work again.
>>> Thank you for your detailed report!
> [...]
> It turns out HDMI output is broken in v6.9 for a different reason.
> However, this commit (b914ec33b391 clk: sunxi-ng: common: Support
> minimum and maximum rate) requires two others as well in order not
> to break things on the A20:
> 
> cedb7dd193f6 drm/sun4i: hdmi: Convert encoder to atomic
> 9ca6bc246035 drm/sun4i: hdmi: Move mode_set into enable
> 
> With those two (the second depends on the first) cherry-picked on top of
> v6.6.31, the HDMI output is working again.  Likewise on v6.8.10.

They from what I can see are not yet in 6.6.y or on their way there (6.8
is EOL now). Did anyone ask Greg to pick this up? If not: Månsm could
you maybe do that? CCing him on a reply and asking is likely enough if
both changes apply cleanly.

Ciao, Thorsten (wearing his 'the Linux kernel's regression tracker' hat)
--
Everything you wanna know about Linux kernel regression tracking:
https://linux-regtracking.leemhuis.info/about/#tldr
If I did something stupid, please tell me, as explained on that page.

#regzbot introduced: 547263745e15a0
#regzbot fix: drm/sun4i: hdmi: Move mode_set into enable
#regzbot poke