diff mbox series

[V5,14/26] mmc: sdhci-uhs2: add set_timeout()

Message ID 20221019110647.11076-15-victor.shih@genesyslogic.com.tw
State New
Headers
Series Add support UHS-II for GL9755 |

Commit Message

Victor Shih Oct. 19, 2022, 11:06 a.m. UTC 
  From: AKASHI Takahiro <takahiro.akashi@linaro.org>

This is a UHS-II version of sdhci's set_timeout() operation.

Signed-off-by: Ben Chuang <ben.chuang@genesyslogic.com.tw>
Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
---
 drivers/mmc/host/sdhci-uhs2.c | 85 +++++++++++++++++++++++++++++++++++
 drivers/mmc/host/sdhci-uhs2.h |  1 +
 2 files changed, 86 insertions(+)

Comments

Adrian Hunter Nov. 1, 2022, 5:14 p.m. UTC | #1 
On 19/10/22 14:06, Victor Shih wrote:
> From: AKASHI Takahiro <takahiro.akashi@linaro.org>
> 
> This is a UHS-II version of sdhci's set_timeout() operation.
> 
> Signed-off-by: Ben Chuang <ben.chuang@genesyslogic.com.tw>
> Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
> ---
>  drivers/mmc/host/sdhci-uhs2.c | 85 +++++++++++++++++++++++++++++++++++
>  drivers/mmc/host/sdhci-uhs2.h |  1 +
>  2 files changed, 86 insertions(+)
> 
> diff --git a/drivers/mmc/host/sdhci-uhs2.c b/drivers/mmc/host/sdhci-uhs2.c
> index 4dc3e904d7d2..2b90e5308764 100644
> --- a/drivers/mmc/host/sdhci-uhs2.c
> +++ b/drivers/mmc/host/sdhci-uhs2.c
> @@ -196,6 +196,91 @@ void sdhci_uhs2_set_power(struct sdhci_host *host, unsigned char mode,
>  }
>  EXPORT_SYMBOL_GPL(sdhci_uhs2_set_power);
>  
> +static u8 sdhci_calc_timeout_uhs2(struct sdhci_host *host, u8 *cmd_res,
> +				  u8 *dead_lock)
> +{
> +	u8 count;
> +	unsigned int cmd_res_timeout, dead_lock_timeout, current_timeout;
> +
> +	/*
> +	 * If the host controller provides us with an incorrect timeout
> +	 * value, just skip the check and use 0xE.  The hardware may take
> +	 * longer to time out, but that's much better than having a too-short
> +	 * timeout value.
> +	 */
> +	if (host->quirks & SDHCI_QUIRK_BROKEN_TIMEOUT_VAL) {
> +		*cmd_res = 0xE;
> +		*dead_lock = 0xE;
> +		return 0xE;
> +	}

Let's skip quirks you don't need for now.

> +
> +	/* timeout in us */
> +	cmd_res_timeout = 5 * 1000;
> +	dead_lock_timeout = 1 * 1000 * 1000;
> +
> +	/*
> +	 * Figure out needed cycles.
> +	 * We do this in steps in order to fit inside a 32 bit int.
> +	 * The first step is the minimum timeout, which will have a
> +	 * minimum resolution of 6 bits:
> +	 * (1) 2^13*1000 > 2^22,
> +	 * (2) host->timeout_clk < 2^16
> +	 *     =>
> +	 *     (1) / (2) > 2^6
> +	 */
> +	count = 0;
> +	current_timeout = (1 << 13) * 1000 / host->timeout_clk;
> +	while (current_timeout < cmd_res_timeout) {
> +		count++;
> +		current_timeout <<= 1;
> +		if (count >= 0xF)
> +			break;
> +	}
> +
> +	if (count >= 0xF) {
> +		DBG("%s: Too large timeout 0x%x requested for CMD_RES!\n",
> +		    mmc_hostname(host->mmc), count);
> +		count = 0xE;
> +	}
> +	*cmd_res = count;
> +
> +	count = 0;
> +	current_timeout = (1 << 13) * 1000 / host->timeout_clk;
> +	while (current_timeout < dead_lock_timeout) {
> +		count++;
> +		current_timeout <<= 1;
> +		if (count >= 0xF)
> +			break;
> +	}
> +
> +	if (count >= 0xF) {
> +		DBG("%s: Too large timeout 0x%x requested for DEADLOCK!\n",
> +		    mmc_hostname(host->mmc), count);
> +		count = 0xE;
> +	}
> +	*dead_lock = count;
> +
> +	return count;
> +}
> +
> +static void __sdhci_uhs2_set_timeout(struct sdhci_host *host)
> +{
> +	u8 cmd_res, dead_lock;
> +
> +	sdhci_calc_timeout_uhs2(host, &cmd_res, &dead_lock);
> +	cmd_res |= dead_lock << SDHCI_UHS2_TIMER_CTRL_DEADLOCK_SHIFT;

GENMASK() and FIELD_PREP() please

> +	sdhci_writeb(host, cmd_res, SDHCI_UHS2_TIMER_CTRL);
> +}
> +
> +void sdhci_uhs2_set_timeout(struct sdhci_host *host, struct mmc_command *cmd)
> +{
> +	__sdhci_set_timeout(host, cmd);
> +
> +	if (host->mmc->flags & MMC_UHS2_SUPPORT)

	if (sdhci_uhs2_mode(host))

> +		__sdhci_uhs2_set_timeout(host);
> +}
> +EXPORT_SYMBOL_GPL(sdhci_uhs2_set_timeout);
> +
>  /*****************************************************************************\
>   *                                                                           *
>   * MMC callbacks                                                             *
> diff --git a/drivers/mmc/host/sdhci-uhs2.h b/drivers/mmc/host/sdhci-uhs2.h
> index 3179915f7f79..5ea235b14108 100644
> --- a/drivers/mmc/host/sdhci-uhs2.h
> +++ b/drivers/mmc/host/sdhci-uhs2.h
> @@ -215,5 +215,6 @@ bool sdhci_uhs2_mode(struct sdhci_host *host);
>  void sdhci_uhs2_reset(struct sdhci_host *host, u16 mask);
>  void sdhci_uhs2_set_power(struct sdhci_host *host, unsigned char mode,
>  			  unsigned short vdd);
> +void sdhci_uhs2_set_timeout(struct sdhci_host *host, struct mmc_command *cmd);
>  
>  #endif /* __SDHCI_UHS2_H */
Victor Shih Dec. 13, 2022, 8:46 a.m. UTC | #2 
Hi, Adrian

On Wed, Nov 2, 2022 at 1:14 AM Adrian Hunter <adrian.hunter@intel.com> wrote:
>
> On 19/10/22 14:06, Victor Shih wrote:
> > From: AKASHI Takahiro <takahiro.akashi@linaro.org>
> >
> > This is a UHS-II version of sdhci's set_timeout() operation.
> >
> > Signed-off-by: Ben Chuang <ben.chuang@genesyslogic.com.tw>
> > Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
> > ---
> >  drivers/mmc/host/sdhci-uhs2.c | 85 +++++++++++++++++++++++++++++++++++
> >  drivers/mmc/host/sdhci-uhs2.h |  1 +
> >  2 files changed, 86 insertions(+)
> >
> > diff --git a/drivers/mmc/host/sdhci-uhs2.c b/drivers/mmc/host/sdhci-uhs2.c
> > index 4dc3e904d7d2..2b90e5308764 100644
> > --- a/drivers/mmc/host/sdhci-uhs2.c
> > +++ b/drivers/mmc/host/sdhci-uhs2.c
> > @@ -196,6 +196,91 @@ void sdhci_uhs2_set_power(struct sdhci_host *host, unsigned char mode,
> >  }
> >  EXPORT_SYMBOL_GPL(sdhci_uhs2_set_power);
> >
> > +static u8 sdhci_calc_timeout_uhs2(struct sdhci_host *host, u8 *cmd_res,
> > +                               u8 *dead_lock)
> > +{
> > +     u8 count;
> > +     unsigned int cmd_res_timeout, dead_lock_timeout, current_timeout;
> > +
> > +     /*
> > +      * If the host controller provides us with an incorrect timeout
> > +      * value, just skip the check and use 0xE.  The hardware may take
> > +      * longer to time out, but that's much better than having a too-short
> > +      * timeout value.
> > +      */
> > +     if (host->quirks & SDHCI_QUIRK_BROKEN_TIMEOUT_VAL) {
> > +             *cmd_res = 0xE;
> > +             *dead_lock = 0xE;
> > +             return 0xE;
> > +     }
>
> Let's skip quirks you don't need for now.
>

I will update it in the patch#13 of the new [PATCH V6].

> > +
> > +     /* timeout in us */
> > +     cmd_res_timeout = 5 * 1000;
> > +     dead_lock_timeout = 1 * 1000 * 1000;
> > +
> > +     /*
> > +      * Figure out needed cycles.
> > +      * We do this in steps in order to fit inside a 32 bit int.
> > +      * The first step is the minimum timeout, which will have a
> > +      * minimum resolution of 6 bits:
> > +      * (1) 2^13*1000 > 2^22,
> > +      * (2) host->timeout_clk < 2^16
> > +      *     =>
> > +      *     (1) / (2) > 2^6
> > +      */
> > +     count = 0;
> > +     current_timeout = (1 << 13) * 1000 / host->timeout_clk;
> > +     while (current_timeout < cmd_res_timeout) {
> > +             count++;
> > +             current_timeout <<= 1;
> > +             if (count >= 0xF)
> > +                     break;
> > +     }
> > +
> > +     if (count >= 0xF) {
> > +             DBG("%s: Too large timeout 0x%x requested for CMD_RES!\n",
> > +                 mmc_hostname(host->mmc), count);
> > +             count = 0xE;
> > +     }
> > +     *cmd_res = count;
> > +
> > +     count = 0;
> > +     current_timeout = (1 << 13) * 1000 / host->timeout_clk;
> > +     while (current_timeout < dead_lock_timeout) {
> > +             count++;
> > +             current_timeout <<= 1;
> > +             if (count >= 0xF)
> > +                     break;
> > +     }
> > +
> > +     if (count >= 0xF) {
> > +             DBG("%s: Too large timeout 0x%x requested for DEADLOCK!\n",
> > +                 mmc_hostname(host->mmc), count);
> > +             count = 0xE;
> > +     }
> > +     *dead_lock = count;
> > +
> > +     return count;
> > +}
> > +
> > +static void __sdhci_uhs2_set_timeout(struct sdhci_host *host)
> > +{
> > +     u8 cmd_res, dead_lock;
> > +
> > +     sdhci_calc_timeout_uhs2(host, &cmd_res, &dead_lock);
> > +     cmd_res |= dead_lock << SDHCI_UHS2_TIMER_CTRL_DEADLOCK_SHIFT;
>
> GENMASK() and FIELD_PREP() please
>
> > +     sdhci_writeb(host, cmd_res, SDHCI_UHS2_TIMER_CTRL);
> > +}
> > +
> > +void sdhci_uhs2_set_timeout(struct sdhci_host *host, struct mmc_command *cmd)
> > +{
> > +     __sdhci_set_timeout(host, cmd);
> > +
> > +     if (host->mmc->flags & MMC_UHS2_SUPPORT)
>
>         if (sdhci_uhs2_mode(host))
>

I will update it in the patch#13 of the new [PATCH V6].

> > +             __sdhci_uhs2_set_timeout(host);
> > +}
> > +EXPORT_SYMBOL_GPL(sdhci_uhs2_set_timeout);
> > +
> >  /*****************************************************************************\
> >   *                                                                           *
> >   * MMC callbacks                                                             *
> > diff --git a/drivers/mmc/host/sdhci-uhs2.h b/drivers/mmc/host/sdhci-uhs2.h
> > index 3179915f7f79..5ea235b14108 100644
> > --- a/drivers/mmc/host/sdhci-uhs2.h
> > +++ b/drivers/mmc/host/sdhci-uhs2.h
> > @@ -215,5 +215,6 @@ bool sdhci_uhs2_mode(struct sdhci_host *host);
> >  void sdhci_uhs2_reset(struct sdhci_host *host, u16 mask);
> >  void sdhci_uhs2_set_power(struct sdhci_host *host, unsigned char mode,
> >                         unsigned short vdd);
> > +void sdhci_uhs2_set_timeout(struct sdhci_host *host, struct mmc_command *cmd);
> >
> >  #endif /* __SDHCI_UHS2_H */
>

Thanks, Victor Shih
diff mbox series

Patch

diff --git a/drivers/mmc/host/sdhci-uhs2.c b/drivers/mmc/host/sdhci-uhs2.c
index 4dc3e904d7d2..2b90e5308764 100644
--- a/drivers/mmc/host/sdhci-uhs2.c
+++ b/drivers/mmc/host/sdhci-uhs2.c
@@ -196,6 +196,91 @@  void sdhci_uhs2_set_power(struct sdhci_host *host, unsigned char mode,
 }
 EXPORT_SYMBOL_GPL(sdhci_uhs2_set_power);
 
+static u8 sdhci_calc_timeout_uhs2(struct sdhci_host *host, u8 *cmd_res,
+				  u8 *dead_lock)
+{
+	u8 count;
+	unsigned int cmd_res_timeout, dead_lock_timeout, current_timeout;
+
+	/*
+	 * If the host controller provides us with an incorrect timeout
+	 * value, just skip the check and use 0xE.  The hardware may take
+	 * longer to time out, but that's much better than having a too-short
+	 * timeout value.
+	 */
+	if (host->quirks & SDHCI_QUIRK_BROKEN_TIMEOUT_VAL) {
+		*cmd_res = 0xE;
+		*dead_lock = 0xE;
+		return 0xE;
+	}
+
+	/* timeout in us */
+	cmd_res_timeout = 5 * 1000;
+	dead_lock_timeout = 1 * 1000 * 1000;
+
+	/*
+	 * Figure out needed cycles.
+	 * We do this in steps in order to fit inside a 32 bit int.
+	 * The first step is the minimum timeout, which will have a
+	 * minimum resolution of 6 bits:
+	 * (1) 2^13*1000 > 2^22,
+	 * (2) host->timeout_clk < 2^16
+	 *     =>
+	 *     (1) / (2) > 2^6
+	 */
+	count = 0;
+	current_timeout = (1 << 13) * 1000 / host->timeout_clk;
+	while (current_timeout < cmd_res_timeout) {
+		count++;
+		current_timeout <<= 1;
+		if (count >= 0xF)
+			break;
+	}
+
+	if (count >= 0xF) {
+		DBG("%s: Too large timeout 0x%x requested for CMD_RES!\n",
+		    mmc_hostname(host->mmc), count);
+		count = 0xE;
+	}
+	*cmd_res = count;
+
+	count = 0;
+	current_timeout = (1 << 13) * 1000 / host->timeout_clk;
+	while (current_timeout < dead_lock_timeout) {
+		count++;
+		current_timeout <<= 1;
+		if (count >= 0xF)
+			break;
+	}
+
+	if (count >= 0xF) {
+		DBG("%s: Too large timeout 0x%x requested for DEADLOCK!\n",
+		    mmc_hostname(host->mmc), count);
+		count = 0xE;
+	}
+	*dead_lock = count;
+
+	return count;
+}
+
+static void __sdhci_uhs2_set_timeout(struct sdhci_host *host)
+{
+	u8 cmd_res, dead_lock;
+
+	sdhci_calc_timeout_uhs2(host, &cmd_res, &dead_lock);
+	cmd_res |= dead_lock << SDHCI_UHS2_TIMER_CTRL_DEADLOCK_SHIFT;
+	sdhci_writeb(host, cmd_res, SDHCI_UHS2_TIMER_CTRL);
+}
+
+void sdhci_uhs2_set_timeout(struct sdhci_host *host, struct mmc_command *cmd)
+{
+	__sdhci_set_timeout(host, cmd);
+
+	if (host->mmc->flags & MMC_UHS2_SUPPORT)
+		__sdhci_uhs2_set_timeout(host);
+}
+EXPORT_SYMBOL_GPL(sdhci_uhs2_set_timeout);
+
 /*****************************************************************************\
  *                                                                           *
  * MMC callbacks                                                             *
diff --git a/drivers/mmc/host/sdhci-uhs2.h b/drivers/mmc/host/sdhci-uhs2.h
index 3179915f7f79..5ea235b14108 100644
--- a/drivers/mmc/host/sdhci-uhs2.h
+++ b/drivers/mmc/host/sdhci-uhs2.h
@@ -215,5 +215,6 @@  bool sdhci_uhs2_mode(struct sdhci_host *host);
 void sdhci_uhs2_reset(struct sdhci_host *host, u16 mask);
 void sdhci_uhs2_set_power(struct sdhci_host *host, unsigned char mode,
 			  unsigned short vdd);
+void sdhci_uhs2_set_timeout(struct sdhci_host *host, struct mmc_command *cmd);
 
 #endif /* __SDHCI_UHS2_H */