Re: [PATCH V4] mmc: sdhci-msm: Update the software timeout value for sdhc

[Ulf Hansson <ulf.hansson@linaro.org>]

+ Stephen

On Mon, 2 Aug 2021 at 12:41, <sbhanu@codeaurora.org> wrote:
>
> Gentle Reminder
>
> Thanks,
> Sajida
>
> On 2021-07-16 17:16, Shaik Sajida Bhanu wrote:
> > Whenever SDHC run at clock rate 50MHZ or below, the hardware data
> > timeout value will be 21.47secs, which is approx. 22secs and we have
> > a current software timeout value as 10secs. We have to set software
> > timeout value more than the hardware data timeout value to avioid
> > seeing
> > the below register dumps.
> >
> > [  332.953670] mmc2: Timeout waiting for hardware interrupt.
> > [  332.959608] mmc2: sdhci: ============ SDHCI REGISTER DUMP
> > ===========
> > [  332.966450] mmc2: sdhci: Sys addr:  0x00000000 | Version:
> > 0x00007202
> > [  332.973256] mmc2: sdhci: Blk size:  0x00000200 | Blk cnt:
> > 0x00000001
> > [  332.980054] mmc2: sdhci: Argument:  0x00000000 | Trn mode:
> > 0x00000027
> > [  332.986864] mmc2: sdhci: Present:   0x01f801f6 | Host ctl:
> > 0x0000001f
> > [  332.993671] mmc2: sdhci: Power:     0x00000001 | Blk gap:
> > 0x00000000
> > [  333.000583] mmc2: sdhci: Wake-up:   0x00000000 | Clock:
> > 0x00000007
> > [  333.007386] mmc2: sdhci: Timeout:   0x0000000e | Int stat:
> > 0x00000000
> > [  333.014182] mmc2: sdhci: Int enab:  0x03ff100b | Sig enab:
> > 0x03ff100b
> > [  333.020976] mmc2: sdhci: ACmd stat: 0x00000000 | Slot int:
> > 0x00000000
> > [  333.027771] mmc2: sdhci: Caps:      0x322dc8b2 | Caps_1:
> > 0x0000808f
> > [  333.034561] mmc2: sdhci: Cmd:       0x0000183a | Max curr:
> > 0x00000000
> > [  333.041359] mmc2: sdhci: Resp[0]:   0x00000900 | Resp[1]:
> > 0x00000000
> > [  333.048157] mmc2: sdhci: Resp[2]:   0x00000000 | Resp[3]:
> > 0x00000000
> > [  333.054945] mmc2: sdhci: Host ctl2: 0x00000000
> > [  333.059657] mmc2: sdhci: ADMA Err:  0x00000000 | ADMA Ptr:
> > 0x0000000ffffff218
> > [  333.067178] mmc2: sdhci_msm: ----------- VENDOR REGISTER DUMP
> > -----------
> > [  333.074343] mmc2: sdhci_msm: DLL sts: 0x00000000 | DLL cfg:
> > 0x6000642c | DLL cfg2: 0x0020a000
> > [  333.083417] mmc2: sdhci_msm: DLL cfg3: 0x00000000 | DLL usr ctl:
> > 0x00000000 | DDR cfg: 0x80040873
> > [  333.092850] mmc2: sdhci_msm: Vndr func: 0x00008a9c | Vndr func2 :
> > 0xf88218a8 Vndr func3: 0x02626040
> > [  333.102371] mmc2: sdhci:
> > ============================================
> >
> > So, set software timeout value more than hardware timeout value.
> >
> > Signed-off-by: Shaik Sajida Bhanu <sbhanu@codeaurora.org>
> > Acked-by: Adrian Hunter <adrian.hunter@intel.com>

Applied for fixes and by adding a stable tag, thanks!

Kind regards
Uffe


> > ---
> >
> > Changes since V3:
> >       - Addressed minor comments from Adrain Hunter and retained his
> >         Acked-by Signed-off.
> >
> > Changes since V2:
> >       - Updated 22 with 22LL to avoid compiler warning as
> >         suggested by Adrian Hunter.
> >       - Added a check to update software data timeout value if its value
> >         is less than the calculated hardware data timeout value as suggested
> >         by Veerabhadrarao Badiganti.
> > Changes since V1:
> >       - Moved software data timeout update part to qcom specific file
> >         as suggested by Veerabhadrarao Badiganti.
> > ---
> >  drivers/mmc/host/sdhci-msm.c | 18 ++++++++++++++++++
> >  1 file changed, 18 insertions(+)
> >
> > diff --git a/drivers/mmc/host/sdhci-msm.c
> > b/drivers/mmc/host/sdhci-msm.c
> > index e44b7a6..290a14c 100644
> > --- a/drivers/mmc/host/sdhci-msm.c
> > +++ b/drivers/mmc/host/sdhci-msm.c
> > @@ -2089,6 +2089,23 @@ static void sdhci_msm_cqe_disable(struct
> > mmc_host *mmc, bool recovery)
> >       sdhci_cqe_disable(mmc, recovery);
> >  }
> >
> > +static void sdhci_msm_set_timeout(struct sdhci_host *host, struct
> > mmc_command *cmd)
> > +{
> > +     u32 count, start = 15;
> > +
> > +     __sdhci_set_timeout(host, cmd);
> > +     count = sdhci_readb(host, SDHCI_TIMEOUT_CONTROL);
> > +     /*
> > +      * Update software timeout value if its value is less than hardware
> > data
> > +      * timeout value. Qcom SoC hardware data timeout value was calculated
> > +      * using 4 * MCLK * 2^(count + 13). where MCLK = 1 / host->clock.
> > +      */
> > +     if (cmd && cmd->data && host->clock > 400000 &&
> > +         host->clock <= 50000000 &&
> > +         ((1 << (count + start)) > (10 * host->clock)))
> > +             host->data_timeout = 22LL * NSEC_PER_SEC;
> > +}
> > +
> >  static const struct cqhci_host_ops sdhci_msm_cqhci_ops = {
> >       .enable         = sdhci_msm_cqe_enable,
> >       .disable        = sdhci_msm_cqe_disable,
> > @@ -2438,6 +2455,7 @@ static const struct sdhci_ops sdhci_msm_ops = {
> >       .irq    = sdhci_msm_cqe_irq,
> >       .dump_vendor_regs = sdhci_msm_dump_vendor_regs,
> >       .set_power = sdhci_set_power_noreg,
> > +     .set_timeout = sdhci_msm_set_timeout,
> >  };
> >
> >  static const struct sdhci_pltfm_data sdhci_msm_pdata = {