linux-kernel - Re: [RFC 3/4] mmc: sdhci-msm: Change the desc_sz on cqe

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Date:   Sat, 2 Sep 2017 10:42:34 +0530
From:   Ritesh Harjani <riteshh@...eaurora.org>
To:     Adrian Hunter <adrian.hunter@...el.com>, ulf.hansson@...aro.org
Cc:     linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org,
        stummala@...eaurora.org, asutoshd@...eaurora.org
Subject: Re: [RFC 3/4] mmc: sdhci-msm: Change the desc_sz on
 cqe_enable/disable.



On 8/31/2017 12:12 PM, Adrian Hunter wrote:
> On 30/08/17 16:04, Ritesh Harjani wrote:
>> When CMDQ is halted the HW expects descriptor size to
>> be same which is using in CMDQ mode.
>> Thus adjust the desc_sz of sdhci accordingly.
>>
>> Without this patch below command gives ADMA error
>> when CQE is enabled.
>> cat /sys/kernel/debug/mmc0/mmc0:0001/ext_csd
>>
>> Signed-off-by: Ritesh Harjani <riteshh@...eaurora.org>
>> ---
>>   drivers/mmc/host/sdhci-msm.c | 24 ++++++++++++++++++++++--
>>   1 file changed, 22 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/mmc/host/sdhci-msm.c b/drivers/mmc/host/sdhci-msm.c
>> index 346cdfb..baa3409 100644
>> --- a/drivers/mmc/host/sdhci-msm.c
>> +++ b/drivers/mmc/host/sdhci-msm.c
>> @@ -1111,9 +1111,29 @@ static u32 sdhci_msm_cqe_irq(struct sdhci_host *host, u32 intmask)
>>   	return 0;
>>   }
>>   
>> +void sdhci_msm_cqe_enable(struct mmc_host *mmc)
>> +{
>> +	struct sdhci_host *host = mmc_priv(mmc);
>> +
>> +	if (host->flags & SDHCI_USE_64_BIT_DMA)
>> +		host->desc_sz = 12;
> 
> This has no effect.

Yes, I added it for the sake of completion.
Sure I will check on this.

> 
>> +
>> +	sdhci_cqe_enable(mmc);
>> +}
>> +
>> +void sdhci_msm_cqe_disable(struct mmc_host *mmc, bool recovery)
>> +{
>> +	struct sdhci_host *host = mmc_priv(mmc);
>> +
>> +	if (host->flags & SDHCI_USE_64_BIT_DMA)
>> +		host->desc_sz = 16;
> 
> You can't change the descriptor size this way.  If you need 128-bit ADMA
> descriptors it must be done in sdhci_setup_host().

Let me again check on this once. I will get back then.
Thanks.

> 
>> +
>> +	sdhci_cqe_disable(mmc, recovery);
>> +}
>> +
>>   static const struct cqhci_host_ops sdhci_msm_cqhci_ops = {
>> -	.enable		= sdhci_cqe_enable,
>> -	.disable	= sdhci_cqe_disable,
>> +	.enable		= sdhci_msm_cqe_enable,
>> +	.disable	= sdhci_msm_cqe_disable,
>>   };
>>   
>>   #ifdef CONFIG_MMC_CQHCI
>>
> 

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