linux-kernel - Re: [PATCH v2 1/2] sdhci: tegra: Implement Tegra specific set

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Date:   Thu, 12 Mar 2020 08:28:40 -0700
From:   Sowjanya Komatineni <skomatineni@...dia.com>
To:     Ulf Hansson <ulf.hansson@...aro.org>
CC:     Adrian Hunter <adrian.hunter@...el.com>,
        Bradley Bolen <bradleybolen@...il.com>,
        Thierry Reding <thierry.reding@...il.com>,
        "Jon Hunter" <jonathanh@...dia.com>,
        Aniruddha Tvs Rao <anrao@...dia.com>,
        linux-tegra <linux-tegra@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>
Subject: Re: [PATCH v2 1/2] sdhci: tegra: Implement Tegra specific set_timeout
 callback


On 3/12/20 6:08 AM, Ulf Hansson wrote:
> External email: Use caution opening links or attachments
>
>
> -trimmed cc list
>
> On Thu, 12 Mar 2020 at 00:51, Sowjanya Komatineni
> <skomatineni@...dia.com> wrote:
>> Tegra host supports HW busy detection and timeouts based on the
>> count programmed in SDHCI_TIMEOUT_CONTROL register and max busy
>> timeout it supports is 11s in finite busy wait mode.
>>
>> Some operations like SLEEP_AWAKE, ERASE and flush cache through
>> SWITCH commands take longer than 11s and Tegra host supports
>> infinite HW busy wait mode where HW waits forever till the card
>> is busy without HW timeout.
>>
>> This patch implements Tegra specific set_timeout sdhci_ops to allow
>> switching between finite and infinite HW busy detection wait modes
>> based on the device command expected operation time.
>>
>> Signed-off-by: Sowjanya Komatineni <skomatineni@...dia.com>
> Applied for next, thanks!
>
> We should probably tag this for stable as well, don't you think?
>
> Kind regards
> Uffe

Yes, we need this for stable as well. As this is applied for next, looks 
like can't re-send patch with tag.

Can you please help to add tag if you don't mind?

>
>
>> ---
>>   drivers/mmc/host/sdhci-tegra.c | 31 +++++++++++++++++++++++++++++++
>>   1 file changed, 31 insertions(+)
>>
>> diff --git a/drivers/mmc/host/sdhci-tegra.c b/drivers/mmc/host/sdhci-tegra.c
>> index a25c3a4..fa8f6a4 100644
>> --- a/drivers/mmc/host/sdhci-tegra.c
>> +++ b/drivers/mmc/host/sdhci-tegra.c
>> @@ -45,6 +45,7 @@
>>   #define SDHCI_TEGRA_CAP_OVERRIDES_DQS_TRIM_SHIFT       8
>>
>>   #define SDHCI_TEGRA_VENDOR_MISC_CTRL                   0x120
>> +#define SDHCI_MISC_CTRL_ERASE_TIMEOUT_LIMIT            BIT(0)
>>   #define SDHCI_MISC_CTRL_ENABLE_SDR104                  0x8
>>   #define SDHCI_MISC_CTRL_ENABLE_SDR50                   0x10
>>   #define SDHCI_MISC_CTRL_ENABLE_SDHCI_SPEC_300          0x20
>> @@ -1227,6 +1228,34 @@ static u32 sdhci_tegra_cqhci_irq(struct sdhci_host *host, u32 intmask)
>>          return 0;
>>   }
>>
>> +static void tegra_sdhci_set_timeout(struct sdhci_host *host,
>> +                                   struct mmc_command *cmd)
>> +{
>> +       u32 val;
>> +
>> +       /*
>> +        * HW busy detection timeout is based on programmed data timeout
>> +        * counter and maximum supported timeout is 11s which may not be
>> +        * enough for long operations like cache flush, sleep awake, erase.
>> +        *
>> +        * ERASE_TIMEOUT_LIMIT bit of VENDOR_MISC_CTRL register allows
>> +        * host controller to wait for busy state until the card is busy
>> +        * without HW timeout.
>> +        *
>> +        * So, use infinite busy wait mode for operations that may take
>> +        * more than maximum HW busy timeout of 11s otherwise use finite
>> +        * busy wait mode.
>> +        */
>> +       val = sdhci_readl(host, SDHCI_TEGRA_VENDOR_MISC_CTRL);
>> +       if (cmd && cmd->busy_timeout >= 11 * HZ)
>> +               val |= SDHCI_MISC_CTRL_ERASE_TIMEOUT_LIMIT;
>> +       else
>> +               val &= ~SDHCI_MISC_CTRL_ERASE_TIMEOUT_LIMIT;
>> +       sdhci_writel(host, val, SDHCI_TEGRA_VENDOR_MISC_CTRL);
>> +
>> +       __sdhci_set_timeout(host, cmd);
>> +}
>> +
>>   static const struct cqhci_host_ops sdhci_tegra_cqhci_ops = {
>>          .write_l    = tegra_cqhci_writel,
>>          .enable = sdhci_tegra_cqe_enable,
>> @@ -1366,6 +1395,7 @@ static const struct sdhci_ops tegra210_sdhci_ops = {
>>          .set_uhs_signaling = tegra_sdhci_set_uhs_signaling,
>>          .voltage_switch = tegra_sdhci_voltage_switch,
>>          .get_max_clock = tegra_sdhci_get_max_clock,
>> +       .set_timeout = tegra_sdhci_set_timeout,
>>   };
>>
>>   static const struct sdhci_pltfm_data sdhci_tegra210_pdata = {
>> @@ -1403,6 +1433,7 @@ static const struct sdhci_ops tegra186_sdhci_ops = {
>>          .voltage_switch = tegra_sdhci_voltage_switch,
>>          .get_max_clock = tegra_sdhci_get_max_clock,
>>          .irq = sdhci_tegra_cqhci_irq,
>> +       .set_timeout = tegra_sdhci_set_timeout,
>>   };
>>
>>   static const struct sdhci_pltfm_data sdhci_tegra186_pdata = {
>> --
>> 2.7.4
>>