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SubjectRe: [RFC 1/4] mmc: cqhci: Move CQHCI_ENABLE before setting TDLBA/TDLBAU
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On 8/31/2017 11:31 AM, Adrian Hunter wrote:
> On 30/08/17 16:04, Ritesh Harjani wrote:
>> Without this patch the CQHCI registers are getting reset
>> again.
>>
>> Signed-off-by: Ritesh Harjani <riteshh@codeaurora.org>
>> ---
>> drivers/mmc/host/cqhci.c | 7 +++----
>> 1 file changed, 3 insertions(+), 4 deletions(-)
>>
>> diff --git a/drivers/mmc/host/cqhci.c b/drivers/mmc/host/cqhci.c
>> index 8650a13..2a7351c 100644
>> --- a/drivers/mmc/host/cqhci.c
>> +++ b/drivers/mmc/host/cqhci.c
>> @@ -262,6 +262,9 @@ static void __cqhci_enable(struct cqhci_host *cq_host)
>>
>> cqhci_writel(cq_host, cqcfg, CQHCI_CFG);
>>
>> + cqcfg |= CQHCI_ENABLE;
>> + cqhci_writel(cq_host, cqcfg, CQHCI_CFG);
> That doesn't follow the flow in the specification B.6.1. Command Queuing
> Initialization Sequence. Also in B.3.5 Task List, the spec. says "Changing
> the value of TDLBA is not allowed when command queue mode is enabled."
>
> So you will need to add a quirk for this.

Sure. thanks.

>
>> +
>> cqhci_writel(cq_host, lower_32_bits(cq_host->desc_dma_base),
>> CQHCI_TDLBA);
>> cqhci_writel(cq_host, upper_32_bits(cq_host->desc_dma_base),
>> @@ -271,10 +274,6 @@ static void __cqhci_enable(struct cqhci_host *cq_host)
>>
>> cqhci_set_irqs(cq_host, 0);
>>
>> - cqcfg |= CQHCI_ENABLE;
>> -
>> - cqhci_writel(cq_host, cqcfg, CQHCI_CFG);
>> -
>> mmc->cqe_on = true;
>>
>> if (cq_host->ops->enable)
>>
>

--
Qualcomm India Private Limited, on behalf of Qualcomm Innovation Center,
Inc.
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a
Linux Foundation Collaborative Project.

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