Re: [PATCH V6 14/24] mmc: sdhci-uhs2: add set_ios()

From: Victor Shih
Date: Fri Feb 24 2023 - 05:24:27 EST

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Hi, Adrian

On Mon, Jan 30, 2023 at 9:16 PM Adrian Hunter <adrian.hunter@xxxxxxxxx> wrote:
>
> On 26/01/23 12:58, Victor Shih wrote:
> > Hi, Adrian
> >
> > On Fri, Jan 6, 2023 at 5:28 AM Adrian Hunter <adrian.hunter@xxxxxxxxx> wrote:
> >>
> >> On 13/12/22 11:00, Victor Shih wrote:
> >>> This is a sdhci version of mmc's set_ios operation.
> >>> It covers both UHS-I and UHS-II.
> >>>
> >>> Signed-off-by: Ben Chuang <ben.chuang@xxxxxxxxxxxxxxxxxxx>
> >>> Signed-off-by: AKASHI Takahiro <takahiro.akashi@xxxxxxxxxx>
> >>> Signed-off-by: Victor Shih <victor.shih@xxxxxxxxxxxxxxxxxxx>
> >>> ---
> >>> drivers/mmc/host/sdhci-uhs2.c | 96 +++++++++++++++++++++++++++++++++++
> >>> drivers/mmc/host/sdhci-uhs2.h | 1 +
> >>> drivers/mmc/host/sdhci.c | 53 +++++++++++--------
> >>> drivers/mmc/host/sdhci.h | 2 +
> >>> 4 files changed, 131 insertions(+), 21 deletions(-)
> >>>
> >>> diff --git a/drivers/mmc/host/sdhci-uhs2.c b/drivers/mmc/host/sdhci-uhs2.c
> >>> index 00b1b69b49ea..3d52d35a91a5 100644
> >>> --- a/drivers/mmc/host/sdhci-uhs2.c
> >>> +++ b/drivers/mmc/host/sdhci-uhs2.c
> >>> @@ -213,6 +213,68 @@ void sdhci_uhs2_set_timeout(struct sdhci_host *host, struct mmc_command *cmd)
> >>> }
> >>> EXPORT_SYMBOL_GPL(sdhci_uhs2_set_timeout);
> >>>
> >>> +/**
> >>> + * sdhci_uhs2_clear_set_irqs - set Error Interrupt Status Enable register
> >>> + * @host: SDHCI host
> >>> + * @clear: bit-wise clear mask
> >>> + * @set: bit-wise set mask
> >>> + *
> >>> + * Set/unset bits in UHS-II Error Interrupt Status Enable register
> >>> + */
> >>> +void sdhci_uhs2_clear_set_irqs(struct sdhci_host *host, u32 clear, u32 set)
> >>> +{
> >>> + u32 ier;
> >>> +
> >>> + ier = sdhci_readl(host, SDHCI_UHS2_INT_STATUS_ENABLE);
> >>> + ier &= ~clear;
> >>> + ier |= set;
> >>> + sdhci_writel(host, ier, SDHCI_UHS2_INT_STATUS_ENABLE);
> >>> + sdhci_writel(host, ier, SDHCI_UHS2_INT_SIGNAL_ENABLE);
> >>> +}
> >>> +EXPORT_SYMBOL_GPL(sdhci_uhs2_clear_set_irqs);
> >>> +
> >>> +static void __sdhci_uhs2_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
> >>> +{
> >>> + struct sdhci_host *host = mmc_priv(mmc);
> >>> + u8 cmd_res, dead_lock;
> >>> + u16 ctrl_2;
> >>> +
> >>> + /* UHS2 Timeout Control */
> >>> + sdhci_calc_timeout_uhs2(host, &cmd_res, &dead_lock);
> >>> +
> >>> + /* change to use calculate value */
> >>> + cmd_res |= FIELD_PREP(SDHCI_UHS2_TIMER_CTRL_DEADLOCK_MASK, dead_lock);
> >>> +
> >>> + sdhci_uhs2_clear_set_irqs(host,
> >>> + SDHCI_UHS2_INT_CMD_TIMEOUT |
> >>> + SDHCI_UHS2_INT_DEADLOCK_TIMEOUT,
> >>> + 0);
> >>> + sdhci_writeb(host, cmd_res, SDHCI_UHS2_TIMER_CTRL);
> >>> + sdhci_uhs2_clear_set_irqs(host, 0,
> >>> + SDHCI_UHS2_INT_CMD_TIMEOUT |
> >>> + SDHCI_UHS2_INT_DEADLOCK_TIMEOUT);
> >>> +
> >>> + /* UHS2 timing */
> >>
> >> Please extend comment to include:
> >>
> >> Note, UHS2 timing is disabled when powering off
> >>

I will update it in V7 version.

> >>> + ctrl_2 = sdhci_readw(host, SDHCI_HOST_CONTROL2);
> >>> + if (ios->timing == MMC_TIMING_SD_UHS2)
> >>> + ctrl_2 |= SDHCI_CTRL_UHS2 | SDHCI_CTRL_UHS2_ENABLE;
> >>> + else
> >>> + ctrl_2 &= ~(SDHCI_CTRL_UHS2 | SDHCI_CTRL_UHS2_ENABLE);
> >>> + sdhci_writew(host, ctrl_2, SDHCI_HOST_CONTROL2);
> >>> +
> >>> + if (!(host->quirks2 & SDHCI_QUIRK2_PRESET_VALUE_BROKEN))
> >>> + sdhci_enable_preset_value(host, true);
> >>> +
> >>> + if (host->ops->set_power)
> >>> + host->ops->set_power(host, ios->power_mode, ios->vdd);
> >>> + else
> >>> + sdhci_uhs2_set_power(host, ios->power_mode, ios->vdd);
> >>
> >> sdhci_set_ios_common() already set the power. Are both needed?
> >>

I will move the set_power function in the sdhci_set_ios_common to the
sdhci_set_ios and update it in V7 version.

> >>> + udelay(100);
> >>
> >> Please add a comment for why this delay is here.
> >>

I will drop it and update in V7 version.

> >>> +
> >>> + host->timing = ios->timing;
> >>
> >> Please move this up to where the timing change is.
> >>
> >
> > The ios->timing was changed in sd_uhs2_power_up function and not
> > modified in this function(__sdhci_uhs2_set_ios), therefore would you
> > want me to move this to the sd_uhs2_power_up function?
>
> No
>
> >
> > As I know the ios->timing is used in sdhci_set_clock function, setting
> > the host->timing before call the sdhci_set_clock function ensures that
> > the host->timing used in sdhci_set_clock function is the most recent
> > value. What do you think about this?
>
> I just meant move it below the timing chunk i.e.
>
> /* UHS2 timing. Note, UHS2 timing is disabled when powering off */
> ctrl_2 = sdhci_readw(host, SDHCI_HOST_CONTROL2);
> if (ios->timing == MMC_TIMING_SD_UHS2)
> ctrl_2 |= SDHCI_CTRL_UHS2 | SDHCI_CTRL_UHS2_ENABLE;
> else
> ctrl_2 &= ~(SDHCI_CTRL_UHS2 | SDHCI_CTRL_UHS2_ENABLE);
> sdhci_writew(host, ctrl_2, SDHCI_HOST_CONTROL2);
> host->timing = ios->timing;
>

I will update it in V7 version.

> >
> >>> + sdhci_set_clock(host, host->clock);
> >>> +}
> >>> +
> >>> /*****************************************************************************\
> >>> * *
> >>> * MMC callbacks *
> >>> @@ -234,6 +296,39 @@ static int sdhci_uhs2_start_signal_voltage_switch(struct mmc_host *mmc,
> >>> return sdhci_start_signal_voltage_switch(mmc, ios);
> >>> }
> >>>
> >>> +int sdhci_uhs2_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
> >>
> >> Should be static
> >>

I will update it in V7 version.

> >>> +{
> >>> + struct sdhci_host *host = mmc_priv(mmc);
> >>> +
> >>> + if (!(host->version >= SDHCI_SPEC_400) ||
> >>> + !(host->mmc->flags & MMC_UHS2_SUPPORT &&
> >>> + host->mmc->caps2 & MMC_CAP2_SD_UHS2)) {
> >>
> >> This can be just:
> >>
> >> if (!sdhci_uhs2_mode(host)) {
> >>
> >> Not sure if this is actually possible?
> >>

I will update it in V7 version.

> >>> + sdhci_set_ios(mmc, ios);
> >>> + return 0;
> >>> + }
> >>> +
> >>> + if (ios->power_mode == MMC_POWER_UNDEFINED)
> >>> + return 0;
> >>> +
> >>> + if (host->flags & SDHCI_DEVICE_DEAD) {
> >>> + if (!IS_ERR(mmc->supply.vmmc) &&
> >>> + ios->power_mode == MMC_POWER_OFF)
> >>> + mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, 0);
> >>> + if (!IS_ERR_OR_NULL(mmc->supply.vmmc2) &&
> >>> + ios->power_mode == MMC_POWER_OFF)
> >>> + mmc_regulator_set_ocr(mmc, mmc->supply.vmmc2, 0);
> >>
> >> This can be just:
> >>
> >> if (ios->power_mode == MMC_POWER_OFF) {
> >> mmc_opt_regulator_set_ocr(mmc, mmc->supply.vmmc, 0);
> >> mmc_opt_regulator_set_ocr(mmc, mmc->supply.vmmc2, 0);
> >> }
> >>

I will update it in V7 version.

> >>> + return -1;
> >>> + }
> >>> +
> >>> + host->timing = ios->timing;
> >>
> >> __sdhci_uhs2_set_ios() does this so it is not needed here.
> >>

I will update it in V7 version.

> >>> +
> >>> + sdhci_set_ios_common(mmc, ios);
> >>> +
> >>> + __sdhci_uhs2_set_ios(mmc, ios);
> >>> +
> >>> + return 0;
> >>> +}
> >>> +
> >>> /*****************************************************************************\
> >>> * *
> >>> * Driver init/exit *
> >>> @@ -244,6 +339,7 @@ static int sdhci_uhs2_host_ops_init(struct sdhci_host *host)
> >>> {
> >>> host->mmc_host_ops.start_signal_voltage_switch =
> >>> sdhci_uhs2_start_signal_voltage_switch;
> >>> + host->mmc_host_ops.uhs2_set_ios = sdhci_uhs2_set_ios;
> >>>
> >>> return 0;
> >>> }
> >>> diff --git a/drivers/mmc/host/sdhci-uhs2.h b/drivers/mmc/host/sdhci-uhs2.h
> >>> index a58ef19c08aa..184fee80253c 100644
> >>> --- a/drivers/mmc/host/sdhci-uhs2.h
> >>> +++ b/drivers/mmc/host/sdhci-uhs2.h
> >>> @@ -178,5 +178,6 @@ void sdhci_uhs2_dump_regs(struct sdhci_host *host);
> >>> bool sdhci_uhs2_mode(struct sdhci_host *host);
> >>> void sdhci_uhs2_reset(struct sdhci_host *host, u16 mask);
> >>> void sdhci_uhs2_set_timeout(struct sdhci_host *host, struct mmc_command *cmd);
> >>> +void sdhci_uhs2_clear_set_irqs(struct sdhci_host *host, u32 clear, u32 set);
> >>>
> >>> #endif /* __SDHCI_UHS2_H */
> >>> diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
> >>> index 99633a3ef549..49bbdc155b2b 100644
> >>> --- a/drivers/mmc/host/sdhci.c
> >>> +++ b/drivers/mmc/host/sdhci.c
> >>> @@ -47,8 +47,6 @@
> >>> static unsigned int debug_quirks = 0;
> >>> static unsigned int debug_quirks2;
> >>>
> >>> -static void sdhci_enable_preset_value(struct sdhci_host *host, bool enable);
> >>> -
> >>> static bool sdhci_send_command(struct sdhci_host *host, struct mmc_command *cmd);
> >>>
> >>> void sdhci_dumpregs(struct sdhci_host *host)
> >>> @@ -1877,6 +1875,9 @@ static u16 sdhci_get_preset_value(struct sdhci_host *host)
> >>> case MMC_TIMING_MMC_HS400:
> >>> preset = sdhci_readw(host, SDHCI_PRESET_FOR_HS400);
> >>> break;
> >>> + case MMC_TIMING_SD_UHS2:
> >>> + preset = sdhci_readw(host, SDHCI_PRESET_FOR_UHS2);
> >>> + break;
> >>> default:
> >>> pr_warn("%s: Invalid UHS-I mode selected\n",
> >>> mmc_hostname(host->mmc));
> >>> @@ -2325,24 +2326,9 @@ static bool sdhci_presetable_values_change(struct sdhci_host *host, struct mmc_i
> >>> (sdhci_preset_needed(host, ios->timing) || host->drv_type != ios->drv_type);
> >>> }
> >>>
> >>> -void sdhci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
> >>> +void sdhci_set_ios_common(struct mmc_host *mmc, struct mmc_ios *ios)
> >>> {
> >>> struct sdhci_host *host = mmc_priv(mmc);
> >>> - bool reinit_uhs = host->reinit_uhs;
> >>> - bool turning_on_clk = false;
> >>> - u8 ctrl;
> >>> -
> >>> - host->reinit_uhs = false;
> >>> -
> >>> - if (ios->power_mode == MMC_POWER_UNDEFINED)
> >>> - return;
> >>> -
> >>> - if (host->flags & SDHCI_DEVICE_DEAD) {
> >>> - if (!IS_ERR(mmc->supply.vmmc) &&
> >>> - ios->power_mode == MMC_POWER_OFF)
> >>> - mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, 0);
> >>> - return;
> >>> - }
> >>>
> >>> /*
> >>> * Reset the chip on each power off.
> >>> @@ -2359,8 +2345,6 @@ void sdhci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
> >>> sdhci_enable_preset_value(host, false);
> >>>
> >>> if (!ios->clock || ios->clock != host->clock) {
> >>> - turning_on_clk = ios->clock && !host->clock;
> >>> -
> >>> host->ops->set_clock(host, ios->clock);
> >>> host->clock = ios->clock;
> >>>
> >>> @@ -2381,6 +2365,32 @@ void sdhci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
> >>> host->ops->set_power(host, ios->power_mode, ios->vdd);
> >>> else
> >>> sdhci_set_power(host, ios->power_mode, ios->vdd);
> >>> +}
> >>> +EXPORT_SYMBOL_GPL(sdhci_set_ios_common);
> >>> +
> >>> +void sdhci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
> >>> +{
> >>> + struct sdhci_host *host = mmc_priv(mmc);
> >>> + bool reinit_uhs = host->reinit_uhs;
> >>> + bool turning_on_clk = false;
> >>> + u8 ctrl;
> >>> +
> >>> + host->reinit_uhs = false;
> >>> +
> >>> + if (ios->power_mode == MMC_POWER_UNDEFINED)
> >>> + return;
> >>> +
> >>> + if (host->flags & SDHCI_DEVICE_DEAD) {
> >>> + if (!IS_ERR(mmc->supply.vmmc) &&
> >>> + ios->power_mode == MMC_POWER_OFF)
> >>> + mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, 0);
> >>> + return;
> >>> + }
> >>> +
> >>> + sdhci_set_ios_common(mmc, ios);
> >>> +
> >>> + if (!ios->clock || ios->clock != host->clock)
> >>> + turning_on_clk = ios->clock && !host->clock;
> >>>
> >>> if (host->ops->platform_send_init_74_clocks)
> >>> host->ops->platform_send_init_74_clocks(host, ios->power_mode);
> >>> @@ -2959,7 +2969,7 @@ int sdhci_execute_tuning(struct mmc_host *mmc, u32 opcode)
> >>> }
> >>> EXPORT_SYMBOL_GPL(sdhci_execute_tuning);
> >>>
> >>> -static void sdhci_enable_preset_value(struct sdhci_host *host, bool enable)
> >>> +void sdhci_enable_preset_value(struct sdhci_host *host, bool enable)
> >>> {
> >>> /* Host Controller v3.00 defines preset value registers */
> >>> if (host->version < SDHCI_SPEC_300)
> >>> @@ -2987,6 +2997,7 @@ static void sdhci_enable_preset_value(struct sdhci_host *host, bool enable)
> >>> host->preset_enabled = enable;
> >>> }
> >>> }
> >>> +EXPORT_SYMBOL_GPL(sdhci_enable_preset_value);
> >>>
> >>> static void sdhci_post_req(struct mmc_host *mmc, struct mmc_request *mrq,
> >>> int err)
> >>> diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h
> >>> index df7fa0c0ebf8..c2f989dc2361 100644
> >>> --- a/drivers/mmc/host/sdhci.h
> >>> +++ b/drivers/mmc/host/sdhci.h
> >>> @@ -850,6 +850,8 @@ void sdhci_set_bus_width(struct sdhci_host *host, int width);
> >>> void sdhci_reset(struct sdhci_host *host, u8 mask);
> >>> void sdhci_set_uhs_signaling(struct sdhci_host *host, unsigned timing);
> >>> int sdhci_execute_tuning(struct mmc_host *mmc, u32 opcode);
> >>> +void sdhci_enable_preset_value(struct sdhci_host *host, bool enable);
> >>> +void sdhci_set_ios_common(struct mmc_host *mmc, struct mmc_ios *ios);
> >>> void sdhci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios);
> >>> int sdhci_start_signal_voltage_switch(struct mmc_host *mmc,
> >>> struct mmc_ios *ios);
> >>
> >
> > Thanks, Victor Shih
>

Thanks, Victor Shih

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