diff mbox series

[V7,13/23] mmc: sdhci-uhs2: add set_timeout()

Message ID 20230331105546.13607-14-victor.shih@genesyslogic.com.tw
State New
Headers
Series Add support UHS-II for GL9755 |

Commit Message

Victor Shih March 31, 2023, 10:55 a.m. UTC 
  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>
Signed-off-by: Victor Shih <victor.shih@genesyslogic.com.tw>
---
 drivers/mmc/host/sdhci-uhs2.c | 72 +++++++++++++++++++++++++++++++++++
 drivers/mmc/host/sdhci-uhs2.h |  1 +
 2 files changed, 73 insertions(+)

Comments

Adrian Hunter April 12, 2023, 1:10 p.m. UTC | #1 
On 31/03/23 13:55, Victor Shih wrote:
> 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>
> Signed-off-by: Victor Shih <victor.shih@genesyslogic.com.tw>
> ---
>  drivers/mmc/host/sdhci-uhs2.c | 72 +++++++++++++++++++++++++++++++++++
>  drivers/mmc/host/sdhci-uhs2.h |  1 +
>  2 files changed, 73 insertions(+)
> 
> diff --git a/drivers/mmc/host/sdhci-uhs2.c b/drivers/mmc/host/sdhci-uhs2.c
> index 388d87537847..e2e9ce51b768 100644
> --- a/drivers/mmc/host/sdhci-uhs2.c
> +++ b/drivers/mmc/host/sdhci-uhs2.c
> @@ -13,6 +13,7 @@
>  #include <linux/delay.h>
>  #include <linux/module.h>
>  #include <linux/iopoll.h>
> +#include <linux/bitfield.h>
>  
>  #include "sdhci.h"
>  #include "sdhci-uhs2.h"
> @@ -144,6 +145,77 @@ static void sdhci_uhs2_set_power(struct sdhci_host *host, unsigned char mode,
>  	}
>  }
>  
> +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;
> +	/* timeout in us */
> +	cmd_res_timeout = 5 * 1000;
> +	dead_lock_timeout = 1 * 1000 * 1000;

Initialization should be combined with declaration,
and by descending line length looks neater i.e.

	unsigned int dead_lock_timeout = 1 * 1000 * 1000;
	unsigned int cmd_res_timeout = 5 * 1000;
	unsigned int current_timeout;
	u8 count;

> +
> +	/*
> +	 * 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 |= FIELD_PREP(SDHCI_UHS2_TIMER_CTRL_DEADLOCK_MASK, dead_lock);
> +	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 (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 6834893eee85..fc03a178b676 100644
> --- a/drivers/mmc/host/sdhci-uhs2.h
> +++ b/drivers/mmc/host/sdhci-uhs2.h
> @@ -180,5 +180,6 @@ struct sdhci_host;
>  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);

Really should forward declare 'struct mmc_command' as was done
for 'struct sdhci_host'

>  
>  #endif /* __SDHCI_UHS2_H */
Victor Shih June 21, 2023, 10:29 a.m. UTC | #2 
Hi, Adrian

On Wed, Apr 12, 2023 at 9:10 PM Adrian Hunter <adrian.hunter@intel.com> wrote:
>
> On 31/03/23 13:55, Victor Shih wrote:
> > 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>
> > Signed-off-by: Victor Shih <victor.shih@genesyslogic.com.tw>
> > ---
> >  drivers/mmc/host/sdhci-uhs2.c | 72 +++++++++++++++++++++++++++++++++++
> >  drivers/mmc/host/sdhci-uhs2.h |  1 +
> >  2 files changed, 73 insertions(+)
> >
> > diff --git a/drivers/mmc/host/sdhci-uhs2.c b/drivers/mmc/host/sdhci-uhs2.c
> > index 388d87537847..e2e9ce51b768 100644
> > --- a/drivers/mmc/host/sdhci-uhs2.c
> > +++ b/drivers/mmc/host/sdhci-uhs2.c
> > @@ -13,6 +13,7 @@
> >  #include <linux/delay.h>
> >  #include <linux/module.h>
> >  #include <linux/iopoll.h>
> > +#include <linux/bitfield.h>
> >
> >  #include "sdhci.h"
> >  #include "sdhci-uhs2.h"
> > @@ -144,6 +145,77 @@ static void sdhci_uhs2_set_power(struct sdhci_host *host, unsigned char mode,
> >       }
> >  }
> >
> > +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;
> > +     /* timeout in us */
> > +     cmd_res_timeout = 5 * 1000;
> > +     dead_lock_timeout = 1 * 1000 * 1000;
>
> Initialization should be combined with declaration,
> and by descending line length looks neater i.e.
>
>         unsigned int dead_lock_timeout = 1 * 1000 * 1000;
>         unsigned int cmd_res_timeout = 5 * 1000;
>         unsigned int current_timeout;
>         u8 count;
>

I will update it to the V8 version.

> > +
> > +     /*
> > +      * 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 |= FIELD_PREP(SDHCI_UHS2_TIMER_CTRL_DEADLOCK_MASK, dead_lock);
> > +     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 (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 6834893eee85..fc03a178b676 100644
> > --- a/drivers/mmc/host/sdhci-uhs2.h
> > +++ b/drivers/mmc/host/sdhci-uhs2.h
> > @@ -180,5 +180,6 @@ struct sdhci_host;
> >  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);
>
> Really should forward declare 'struct mmc_command' as was done
> for 'struct sdhci_host'
>

I will update it to the V8 version.

> >
> >  #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 388d87537847..e2e9ce51b768 100644
--- a/drivers/mmc/host/sdhci-uhs2.c
+++ b/drivers/mmc/host/sdhci-uhs2.c
@@ -13,6 +13,7 @@ 
 #include <linux/delay.h>
 #include <linux/module.h>
 #include <linux/iopoll.h>
+#include <linux/bitfield.h>
 
 #include "sdhci.h"
 #include "sdhci-uhs2.h"
@@ -144,6 +145,77 @@  static void sdhci_uhs2_set_power(struct sdhci_host *host, unsigned char mode,
 	}
 }
 
+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;
+	/* 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 |= FIELD_PREP(SDHCI_UHS2_TIMER_CTRL_DEADLOCK_MASK, dead_lock);
+	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 (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 6834893eee85..fc03a178b676 100644
--- a/drivers/mmc/host/sdhci-uhs2.h
+++ b/drivers/mmc/host/sdhci-uhs2.h
@@ -180,5 +180,6 @@  struct sdhci_host;
 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);
 
 #endif /* __SDHCI_UHS2_H */