linux-kernel - Re: [PATCH v3 6/7] mmc: sdhci_am654: Fix SDHCI_RESET

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Message-ID: <d5a6cd9f-4f1e-5d54-ebd4-e48f73268153@gmail.com>
Date:   Wed, 26 Oct 2022 11:23:02 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Brian Norris <briannorris@...omium.org>,
        Adrian Hunter <adrian.hunter@...el.com>
Cc:     Ulf Hansson <ulf.hansson@...aro.org>,
        Shawn Lin <shawn.lin@...k-chips.com>,
        linux-mmc@...r.kernel.org, Al Cooper <alcooperx@...il.com>,
        Bjorn Andersson <andersson@...nel.org>,
        Sowjanya Komatineni <skomatineni@...dia.com>,
        Broadcom internal kernel review list 
        <bcm-kernel-feedback-list@...adcom.com>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Konrad Dybcio <konrad.dybcio@...ainline.org>,
        NXP Linux Team <linux-imx@....com>,
        Thierry Reding <thierry.reding@...il.com>,
        Fabio Estevam <festevam@...il.com>,
        Michal Simek <michal.simek@...inx.com>,
        linux-kernel@...r.kernel.org, Shawn Guo <shawnguo@...nel.org>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        linux-arm-msm@...r.kernel.org, Haibo Chen <haibo.chen@....com>,
        Andy Gross <agross@...nel.org>,
        linux-arm-kernel@...ts.infradead.org,
        Jonathan Hunter <jonathanh@...dia.com>
Subject: Re: [PATCH v3 6/7] mmc: sdhci_am654: Fix SDHCI_RESET_ALL for CQHCI

On 10/26/22 11:18, Brian Norris wrote:
> Hi Adrian,
> 
> On Wed, Oct 26, 2022 at 08:36:48AM +0300, Adrian Hunter wrote:
>> On 26/10/22 01:26, Brian Norris wrote:
>>> On Tue, Oct 25, 2022 at 02:53:46PM -0700, Florian Fainelli wrote:
>>>> On 10/25/22 14:45, Brian Norris wrote:
>>>>> On Tue, Oct 25, 2022 at 04:10:44PM +0300, Adrian Hunter wrote:
>>>>>> On 24/10/22 20:55, Brian Norris wrote:
>>>>>>> diff --git a/drivers/mmc/host/sdhci_am654.c b/drivers/mmc/host/sdhci_am654.c
>>>>>>> index 8f1023480e12..6a282c7a221e 100644
>>>>>>> --- a/drivers/mmc/host/sdhci_am654.c
>>>>>>> +++ b/drivers/mmc/host/sdhci_am654.c
>>>>>
>>>>>>> @@ -378,7 +379,7 @@ static void sdhci_am654_reset(struct sdhci_host *host, u8 mask)
>>>>>>>    	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
>>>>>>>    	struct sdhci_am654_data *sdhci_am654 = sdhci_pltfm_priv(pltfm_host);
>>>>>>> -	sdhci_reset(host, mask);
>>>>>>> +	sdhci_and_cqhci_reset(host, mask);
>>>>>>>    	if (sdhci_am654->quirks & SDHCI_AM654_QUIRK_FORCE_CDTEST) {
>>>>>>>    		ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
>>>>>>
>>>>>> What about sdhci_reset in sdhci_am654_ops ?
>>>>>
>>>>> Oops, I think you caught a big fallacy in some of my patches: I assumed
>>>>> there was a single reset() implementation in a given driver (an unwise
>>>>> assumption, I realize). I see at least sdhci-brcmstb.c also has several
>>>>> variant ops that call sdhci_reset(), and I should probably convert them
>>>>> too.
>>
>> I checked and found only sdhci_am654_ops
> 
> And...how about sdhci_j721e_8bit_ops in that same driver?
> 
>>>> You got it right for sdhci-brcmstb.c because "supports-cqe" which gates the
>>>> enabling of CQE can only be found with the "brcm,bcm7216-sdhci" compatible
>>>> which implies using brcmstb_reset().
>>>
>>> I don't see any in-tree device trees for these chips (which is OK), and
>>> that's not what the Documentation/ says, and AFAICT nothing in the
>>> driver is limiting other variants from specifying the "supports-cqe"
>>> flag in their (out-of-tree) device tree. The closest thing I see is that
>>> an *example* in brcm,sdhci-brcmstb.yaml shows "supports-cqe" only on
>>> brcm,bcm7216-sdhci -- but an example is not a binding agreement. Am I
>>> missing something?
>>
>> It was mentioned in the patch from the Fixes tag.
> 
> OK, good note. If I don't patch the other seemingly-unaffected variants
> in brcmstb, I'll at least update the commit message, since the code
> doesn't tell me they're unaffected.

You can mention in the commit message that they are unaffected and quote 
me on that if you feel like this needs to be explicitly said.
-- 
Florian