linux-kernel - Re: [PATCH] mmc: sdhci-of-arasan: Add quirk to avoid erroneous msg

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Date:   Tue, 27 Feb 2018 22:42:03 +0800
From:   Shawn Lin <shawn.lin@...k-chips.com>
To:     Phil Edworthy <phil.edworthy@...esas.com>
Cc:     shawn.lin@...k-chips.com, Adrian Hunter <adrian.hunter@...el.com>,
        Michal Simek <michal.simek@...inx.com>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        "linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-renesas-soc@...r.kernel.org" 
        <linux-renesas-soc@...r.kernel.org>
Subject: Re: [PATCH] mmc: sdhci-of-arasan: Add quirk to avoid erroneous msg

On 2018/2/27 22:31, Phil Edworthy wrote:
> Hi Shawn,
> 
> On 27 February 2018 14:28, Shawn Lin wrote:
>> 在 2018/2/27 21:55, Phil Edworthy 写道:
>>> Since the controller does not support the end-of-busy IRQ, don't use it.
>>> Otherwise, on older SD cards you will get lots of these messages:
>>> "mmc0: Got data interrupt 0x00000002 even though no data operation was
>> in progress"
>>>
>>
>> I'm afraid you have to explain which version of arasan's IP suffer from this
>> and what does the "older SD cards" mean?
> Ok, I'll try to find out the IP version...
> For "older SD cards", I can provide a list of a few cards that exhibit this problem
> and others that don't, is that enough info?

What I meant is could you elaborate more about what kind of cards, e.g,
are them the  legacy SDSC cards or SDHC cards, or maybe they are only
running with defaut speed? or whatever, but not just with a vague
"older" cards. :)

> 
> Thanks
> Phil
> 
>>> This has been reported on Xilinx devices that also use the Arasan IP.
>>> See https://patchwork.kernel.org/patch/8062871/
>>>
>>> This has been tested on the Renesas RZ/ND-DB board with the RZ/N1 SoC.
>>>
>>> Signed-off-by: Phil Edworthy <phil.edworthy@...esas.com>
>>> ---
>>>    drivers/mmc/host/sdhci-of-arasan.c | 3 ++-
>>>    1 file changed, 2 insertions(+), 1 deletion(-)
>>>
>>> diff --git a/drivers/mmc/host/sdhci-of-arasan.c
>>> b/drivers/mmc/host/sdhci-of-arasan.c
>>> index c33a5f7..ab66e32 100644
>>> --- a/drivers/mmc/host/sdhci-of-arasan.c
>>> +++ b/drivers/mmc/host/sdhci-of-arasan.c
>>> @@ -290,7 +290,8 @@ static const struct sdhci_pltfm_data
>> sdhci_arasan_pdata = {
>>>    	.ops = &sdhci_arasan_ops,
>>>    	.quirks = SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN,
>>>    	.quirks2 = SDHCI_QUIRK2_PRESET_VALUE_BROKEN |
>>> -			SDHCI_QUIRK2_CLOCK_DIV_ZERO_BROKEN,
>>> +			SDHCI_QUIRK2_CLOCK_DIV_ZERO_BROKEN |
>>> +			SDHCI_QUIRK2_STOP_WITH_TC,
>>>    };
>>>
>>>    static u32 sdhci_arasan_cqhci_irq(struct sdhci_host *host, u32
>>> intmask)
>>>
>>
>>
>> --
>> Best Regards
>> Shawn Lin
> 
> 
> 
> 


-- 
Best Regards
Shawn Lin