diff mbox series

[V5,17/26] mmc: sdhci-uhs2: add clock operations

Message ID 20221019110647.11076-18-victor.shih@genesyslogic.com.tw
State New
Headers show
Series Add support UHS-II for GL9755 | expand

Commit Message

Victor Shih Oct. 19, 2022, 11:06 a.m. UTC 
This is a sdhci version of mmc's uhs2_[enable|disable]_clk operations.

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 | 36 +++++++++++++++++++++++++++++++++++
 1 file changed, 36 insertions(+)

Comments

Adrian Hunter Nov. 1, 2022, 5:14 p.m. UTC | #1 
On 19/10/22 14:06, Victor Shih wrote:
> This is a sdhci version of mmc's uhs2_[enable|disable]_clk operations.
> 
> 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 | 36 +++++++++++++++++++++++++++++++++++
>  1 file changed, 36 insertions(+)
> 
> diff --git a/drivers/mmc/host/sdhci-uhs2.c b/drivers/mmc/host/sdhci-uhs2.c
> index 9ceae552c323..afaca5d96938 100644
> --- a/drivers/mmc/host/sdhci-uhs2.c
> +++ b/drivers/mmc/host/sdhci-uhs2.c
> @@ -11,6 +11,7 @@
>   */
>  
>  #include <linux/delay.h>
> +#include <linux/ktime.h>
>  #include <linux/module.h>
>  
>  #include "sdhci.h"
> @@ -403,6 +404,37 @@ int sdhci_uhs2_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
>  	return 0;
>  }
>  
> +static int sdhci_uhs2_disable_clk(struct mmc_host *mmc)
> +{
> +	struct sdhci_host *host = mmc_priv(mmc);
> +	u16 clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL);
> +
> +	clk &= ~SDHCI_CLOCK_CARD_EN;
> +	sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
> +
> +	return 0;
> +}
> +
> +static int sdhci_uhs2_enable_clk(struct mmc_host *mmc)
> +{
> +	struct sdhci_host *host = mmc_priv(mmc);
> +	u16 clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL);
> +	u32 val;
> +	/* 20ms */
> +	int timeout_us = 20000;
> +
> +	clk |= SDHCI_CLOCK_CARD_EN;
> +	sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
> +
> +	if (read_poll_timeout_atomic(sdhci_readw, val, (val & SDHCI_CLOCK_INT_STABLE),
> +				     10, timeout_us, true, host, SDHCI_CLOCK_CONTROL)) {
> +		pr_err("%s: Internal clock never stabilised.\n", mmc_hostname(host->mmc));
> +		sdhci_dumpregs(host);
> +		return 1;
> +	}
> +	return 0;
> +}
> +
>  /*****************************************************************************\
>   *                                                                           *
>   * Driver init/exit                                                          *
> @@ -560,6 +592,10 @@ static int sdhci_uhs2_host_ops_init(struct sdhci_host *host)
>  
>  	if (!host->mmc_host_ops.uhs2_detect_init)
>  		host->mmc_host_ops.uhs2_detect_init = sdhci_uhs2_do_detect_init;
> +	if (!host->mmc_host_ops.uhs2_disable_clk)
> +		host->mmc_host_ops.uhs2_disable_clk = sdhci_uhs2_disable_clk;
> +	if (!host->mmc_host_ops.uhs2_enable_clk)
> +		host->mmc_host_ops.uhs2_enable_clk = sdhci_uhs2_enable_clk;

As mentioned before ->uhs2_disable_clk() and ->uhs2_enable_clk()
are never called.

>  
>  	return 0;
>  }
Victor Shih Dec. 13, 2022, 8:47 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:
> > This is a sdhci version of mmc's uhs2_[enable|disable]_clk operations.
> >
> > 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 | 36 +++++++++++++++++++++++++++++++++++
> >  1 file changed, 36 insertions(+)
> >
> > diff --git a/drivers/mmc/host/sdhci-uhs2.c b/drivers/mmc/host/sdhci-uhs2.c
> > index 9ceae552c323..afaca5d96938 100644
> > --- a/drivers/mmc/host/sdhci-uhs2.c
> > +++ b/drivers/mmc/host/sdhci-uhs2.c
> > @@ -11,6 +11,7 @@
> >   */
> >
> >  #include <linux/delay.h>
> > +#include <linux/ktime.h>
> >  #include <linux/module.h>
> >
> >  #include "sdhci.h"
> > @@ -403,6 +404,37 @@ int sdhci_uhs2_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
> >       return 0;
> >  }
> >
> > +static int sdhci_uhs2_disable_clk(struct mmc_host *mmc)
> > +{
> > +     struct sdhci_host *host = mmc_priv(mmc);
> > +     u16 clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL);
> > +
> > +     clk &= ~SDHCI_CLOCK_CARD_EN;
> > +     sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
> > +
> > +     return 0;
> > +}
> > +
> > +static int sdhci_uhs2_enable_clk(struct mmc_host *mmc)
> > +{
> > +     struct sdhci_host *host = mmc_priv(mmc);
> > +     u16 clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL);
> > +     u32 val;
> > +     /* 20ms */
> > +     int timeout_us = 20000;
> > +
> > +     clk |= SDHCI_CLOCK_CARD_EN;
> > +     sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
> > +
> > +     if (read_poll_timeout_atomic(sdhci_readw, val, (val & SDHCI_CLOCK_INT_STABLE),
> > +                                  10, timeout_us, true, host, SDHCI_CLOCK_CONTROL)) {
> > +             pr_err("%s: Internal clock never stabilised.\n", mmc_hostname(host->mmc));
> > +             sdhci_dumpregs(host);
> > +             return 1;
> > +     }
> > +     return 0;
> > +}
> > +
> >  /*****************************************************************************\
> >   *                                                                           *
> >   * Driver init/exit                                                          *
> > @@ -560,6 +592,10 @@ static int sdhci_uhs2_host_ops_init(struct sdhci_host *host)
> >
> >       if (!host->mmc_host_ops.uhs2_detect_init)
> >               host->mmc_host_ops.uhs2_detect_init = sdhci_uhs2_do_detect_init;
> > +     if (!host->mmc_host_ops.uhs2_disable_clk)
> > +             host->mmc_host_ops.uhs2_disable_clk = sdhci_uhs2_disable_clk;
> > +     if (!host->mmc_host_ops.uhs2_enable_clk)
> > +             host->mmc_host_ops.uhs2_enable_clk = sdhci_uhs2_enable_clk;
>
> As mentioned before ->uhs2_disable_clk() and ->uhs2_enable_clk()
> are never called.
>

I will update it in the patch#16 of the new [PATCH V6].

> >
> >       return 0;
> >  }
>

Thanks, Victor Shih
diff mbox series

Patch

diff --git a/drivers/mmc/host/sdhci-uhs2.c b/drivers/mmc/host/sdhci-uhs2.c
index 9ceae552c323..afaca5d96938 100644
--- a/drivers/mmc/host/sdhci-uhs2.c
+++ b/drivers/mmc/host/sdhci-uhs2.c
@@ -11,6 +11,7 @@ 
  */
 
 #include <linux/delay.h>
+#include <linux/ktime.h>
 #include <linux/module.h>
 
 #include "sdhci.h"
@@ -403,6 +404,37 @@  int sdhci_uhs2_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
 	return 0;
 }
 
+static int sdhci_uhs2_disable_clk(struct mmc_host *mmc)
+{
+	struct sdhci_host *host = mmc_priv(mmc);
+	u16 clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL);
+
+	clk &= ~SDHCI_CLOCK_CARD_EN;
+	sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
+
+	return 0;
+}
+
+static int sdhci_uhs2_enable_clk(struct mmc_host *mmc)
+{
+	struct sdhci_host *host = mmc_priv(mmc);
+	u16 clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL);
+	u32 val;
+	/* 20ms */
+	int timeout_us = 20000;
+
+	clk |= SDHCI_CLOCK_CARD_EN;
+	sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
+
+	if (read_poll_timeout_atomic(sdhci_readw, val, (val & SDHCI_CLOCK_INT_STABLE),
+				     10, timeout_us, true, host, SDHCI_CLOCK_CONTROL)) {
+		pr_err("%s: Internal clock never stabilised.\n", mmc_hostname(host->mmc));
+		sdhci_dumpregs(host);
+		return 1;
+	}
+	return 0;
+}
+
 /*****************************************************************************\
  *                                                                           *
  * Driver init/exit                                                          *
@@ -560,6 +592,10 @@  static int sdhci_uhs2_host_ops_init(struct sdhci_host *host)
 
 	if (!host->mmc_host_ops.uhs2_detect_init)
 		host->mmc_host_ops.uhs2_detect_init = sdhci_uhs2_do_detect_init;
+	if (!host->mmc_host_ops.uhs2_disable_clk)
+		host->mmc_host_ops.uhs2_disable_clk = sdhci_uhs2_disable_clk;
+	if (!host->mmc_host_ops.uhs2_enable_clk)
+		host->mmc_host_ops.uhs2_enable_clk = sdhci_uhs2_enable_clk;
 
 	return 0;
 }