linux-kernel - Re: [PATCH v2] mmc: meson-mx-sdhc: Fix initialization frozen issue

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Date:   Fri, 3 Nov 2023 23:22:39 +0800
From:   Ziyang Huang <hzyitc@...look.com>
To:     Ulf Hansson <ulf.hansson@...aro.org>
Cc:     neil.armstrong@...aro.org, khilman@...libre.com,
        jbrunet@...libre.com, martin.blumenstingl@...glemail.com,
        yinxin_1989@...yun.com, regressions@...mhuis.info,
        briannorris@...omium.org, linux-mmc@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-amlogic@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Anand Moon <linux.amoon@...il.com>
Subject: Re: [PATCH v2] mmc: meson-mx-sdhc: Fix initialization frozen issue

在 2023/11/3 19:15, Ulf Hansson 写道:
> + Anand
> 
> On Tue, 10 Oct 2023 at 18:44, Ziyang Huang <hzyitc@...look.com> wrote:
>>
>> Commit 4bc31edebde5 ("mmc: core: Set HS clock speed before sending
>> HS CMD13") set HS clock (52MHz) before switching to HS mode. For this
>> freq, FCLK_DIV5 will be selected and div value is 10 (reg value is 9).
>> Then we set rx_clk_phase to 11 or 15 which is out of range and make
>> hardware frozen. After we send command request, no irq will be
>> interrupted and the mmc driver will keep to wait for request finished,
>> even durning rebooting.
>>
>> So let's set it to Phase 90 which should work in most cases. Then let
>> meson_mx_sdhc_execute_tuning() to find the accurate value for data
>> transfer.
>>
>> If this doesn't work, maybe need to define a factor in dts.
>>
>> Fixes: e4bf1b0970ef ("mmc: host: meson-mx-sdhc: new driver for the Amlogic Meson SDHC host")
>> Signed-off-by: Ziyang Huang <hzyitc@...look.com>
> 
> Let's give this a try! Although, rather than queuing it as a fix for
> v6.7, I am picking it for v6.8 and adding a stable tag, this should
> allow it to become a bit more tested first.
> 
> Kind regards
> Uffe
> 
> 

Yes, I think any fixes better than now since it's broken and can't work.