[PATCH 1/2] spi: make sure all transfer has proper speed set

[PATCH 1/2] spi: make sure all transfer has proper speed set

[Laxman Dewangan]

When spi client does the spi transfer and if it does not set
the speed for each transfer then set it as default
of spi device in spi core before calling low level transfer.

This will remove the extra check in low level driver for setting
speed.

Signed-off-by: Laxman Dewangan <ldewangan-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
---
 drivers/spi/spi.c |    6 ++++--
 1 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
index 19ee901..9676a29 100644
--- a/drivers/spi/spi.c
+++ b/drivers/spi/spi.c
@@ -1366,12 +1366,14 @@ static int __spi_async(struct spi_device *spi, struct spi_message *message)
 	}
 
 	/**
-	 * Set transfer bits_per_word as spi device default if it is not
-	 * set for this transfer.
+	 * Set transfer bits_per_word and max speed as spi device default if
+	 * it is not set for this transfer.
 	 */
 	list_for_each_entry(xfer, &message->transfers, transfer_list) {
 		if (!xfer->bits_per_word)
 			xfer->bits_per_word = spi->bits_per_word;
+		if (!xfer->speed_hz)
+			xfer->speed_hz = spi->max_speed_hz;
 	}
 
 	message->spi = spi;
-- 
1.7.1.1


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[PATCH 2/2] spi: tegra: remove checks for valid speed

[Laxman Dewangan]

SPI core make sure that all transfer has proper speed set
before calling low level spi transfer. Hence, it is not
require to have check in spi driver.

Remove the check for speed validity from transfer and use it directly.

Signed-off-by: Laxman Dewangan <ldewangan-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
---
 drivers/spi/spi-tegra20-sflash.c |   14 +++++++++++---
 drivers/spi/spi-tegra20-slink.c  |    6 +++---
 2 files changed, 14 insertions(+), 6 deletions(-)

diff --git a/drivers/spi/spi-tegra20-sflash.c b/drivers/spi/spi-tegra20-sflash.c
index 448a8cc..9a42c15 100644
--- a/drivers/spi/spi-tegra20-sflash.c
+++ b/drivers/spi/spi-tegra20-sflash.c
@@ -269,9 +269,7 @@ static int tegra_sflash_start_transfer_one(struct spi_device *spi,
 	u32 speed;
 	unsigned long command;
 
-	speed = t->speed_hz ? t->speed_hz : spi->max_speed_hz;
-	if (!speed)
-		speed = tsd->spi_max_frequency;
+	speed = t->speed_hz;
 	if (speed != tsd->cur_speed) {
 		clk_set_rate(tsd->clk, speed);
 		tsd->cur_speed = speed;
@@ -319,6 +317,15 @@ static int tegra_sflash_start_transfer_one(struct spi_device *spi,
 	return  tegra_sflash_start_cpu_based_transfer(tsd, t);
 }
 
+static int tegra_sflash_setup(struct spi_device *spi)
+{
+	struct tegra_sflash_data *tsd = spi_master_get_devdata(spi->master);
+
+	/* Set speed to the spi max fequency if spi device has not set */
+	spi->max_speed_hz = spi->max_speed_hz ? : tsd->spi_max_frequency;
+	return 0;
+}
+
 static int tegra_sflash_transfer_one_message(struct spi_master *master,
 			struct spi_message *msg)
 {
@@ -492,6 +499,7 @@ static int tegra_sflash_probe(struct platform_device *pdev)
 
 	/* the spi->mode bits understood by this driver: */
 	master->mode_bits = SPI_CPOL | SPI_CPHA;
+	master->setup = tegra_sflash_setup;
 	master->transfer_one_message = tegra_sflash_transfer_one_message;
 	master->num_chipselect = MAX_CHIP_SELECT;
 	master->bus_num = -1;
diff --git a/drivers/spi/spi-tegra20-slink.c b/drivers/spi/spi-tegra20-slink.c
index 651167f..29039f1 100644
--- a/drivers/spi/spi-tegra20-slink.c
+++ b/drivers/spi/spi-tegra20-slink.c
@@ -728,9 +728,7 @@ static int tegra_slink_start_transfer_one(struct spi_device *spi,
 	unsigned long command2;
 
 	bits_per_word = t->bits_per_word;
-	speed = t->speed_hz ? t->speed_hz : spi->max_speed_hz;
-	if (!speed)
-		speed = tspi->spi_max_frequency;
+	speed = t->speed_hz;
 	if (speed != tspi->cur_speed) {
 		clk_set_rate(tspi->clk, speed * 4);
 		tspi->cur_speed = speed;
@@ -841,6 +839,8 @@ static int tegra_slink_setup(struct spi_device *spi)
 
 	BUG_ON(spi->chip_select >= MAX_CHIP_SELECT);
 
+	/* Set speed to the spi max fequency if spi device has not set */
+	spi->max_speed_hz = spi->max_speed_hz ? : tspi->spi_max_frequency;
 	ret = pm_runtime_get_sync(tspi->dev);
 	if (ret < 0) {
 		dev_err(tspi->dev, "pm runtime failed, e = %d\n", ret);
-- 
1.7.1.1


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Re: [PATCH 2/2] spi: tegra: remove checks for valid speed

[Grant Likely]

On Sat, 5 Jan 2013 00:17:15 +0530, Laxman Dewangan <ldewangan-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org> wrote:
> SPI core make sure that all transfer has proper speed set
> before calling low level spi transfer. Hence, it is not
> require to have check in spi driver.
> 
> Remove the check for speed validity from transfer and use it directly.
> 
> Signed-off-by: Laxman Dewangan <ldewangan-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>

Applied, thanks.

g.

> ---
>  drivers/spi/spi-tegra20-sflash.c |   14 +++++++++++---
>  drivers/spi/spi-tegra20-slink.c  |    6 +++---
>  2 files changed, 14 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/spi/spi-tegra20-sflash.c b/drivers/spi/spi-tegra20-sflash.c
> index 448a8cc..9a42c15 100644
> --- a/drivers/spi/spi-tegra20-sflash.c
> +++ b/drivers/spi/spi-tegra20-sflash.c
> @@ -269,9 +269,7 @@ static int tegra_sflash_start_transfer_one(struct spi_device *spi,
>  	u32 speed;
>  	unsigned long command;
>  
> -	speed = t->speed_hz ? t->speed_hz : spi->max_speed_hz;
> -	if (!speed)
> -		speed = tsd->spi_max_frequency;
> +	speed = t->speed_hz;
>  	if (speed != tsd->cur_speed) {
>  		clk_set_rate(tsd->clk, speed);
>  		tsd->cur_speed = speed;
> @@ -319,6 +317,15 @@ static int tegra_sflash_start_transfer_one(struct spi_device *spi,
>  	return  tegra_sflash_start_cpu_based_transfer(tsd, t);
>  }
>  
> +static int tegra_sflash_setup(struct spi_device *spi)
> +{
> +	struct tegra_sflash_data *tsd = spi_master_get_devdata(spi->master);
> +
> +	/* Set speed to the spi max fequency if spi device has not set */
> +	spi->max_speed_hz = spi->max_speed_hz ? : tsd->spi_max_frequency;
> +	return 0;
> +}
> +
>  static int tegra_sflash_transfer_one_message(struct spi_master *master,
>  			struct spi_message *msg)
>  {
> @@ -492,6 +499,7 @@ static int tegra_sflash_probe(struct platform_device *pdev)
>  
>  	/* the spi->mode bits understood by this driver: */
>  	master->mode_bits = SPI_CPOL | SPI_CPHA;
> +	master->setup = tegra_sflash_setup;
>  	master->transfer_one_message = tegra_sflash_transfer_one_message;
>  	master->num_chipselect = MAX_CHIP_SELECT;
>  	master->bus_num = -1;
> diff --git a/drivers/spi/spi-tegra20-slink.c b/drivers/spi/spi-tegra20-slink.c
> index 651167f..29039f1 100644
> --- a/drivers/spi/spi-tegra20-slink.c
> +++ b/drivers/spi/spi-tegra20-slink.c
> @@ -728,9 +728,7 @@ static int tegra_slink_start_transfer_one(struct spi_device *spi,
>  	unsigned long command2;
>  
>  	bits_per_word = t->bits_per_word;
> -	speed = t->speed_hz ? t->speed_hz : spi->max_speed_hz;
> -	if (!speed)
> -		speed = tspi->spi_max_frequency;
> +	speed = t->speed_hz;
>  	if (speed != tspi->cur_speed) {
>  		clk_set_rate(tspi->clk, speed * 4);
>  		tspi->cur_speed = speed;
> @@ -841,6 +839,8 @@ static int tegra_slink_setup(struct spi_device *spi)
>  
>  	BUG_ON(spi->chip_select >= MAX_CHIP_SELECT);
>  
> +	/* Set speed to the spi max fequency if spi device has not set */
> +	spi->max_speed_hz = spi->max_speed_hz ? : tspi->spi_max_frequency;
>  	ret = pm_runtime_get_sync(tspi->dev);
>  	if (ret < 0) {
>  		dev_err(tspi->dev, "pm runtime failed, e = %d\n", ret);
> -- 
> 1.7.1.1
> 

-- 
Grant Likely, B.Sc, P.Eng.
Secret Lab Technologies, Ltd.

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Re: [PATCH 1/2] spi: make sure all transfer has proper speed set

[Grant Likely]

On Sat, 5 Jan 2013 00:17:14 +0530, Laxman Dewangan <ldewangan@nvidia.com> wrote:
> When spi client does the spi transfer and if it does not set
> the speed for each transfer then set it as default
> of spi device in spi core before calling low level transfer.
> 
> This will remove the extra check in low level driver for setting
> speed.
> 
> Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com>

Applied, thanks.

g.

> ---
>  drivers/spi/spi.c |    6 ++++--
>  1 files changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
> index 19ee901..9676a29 100644
> --- a/drivers/spi/spi.c
> +++ b/drivers/spi/spi.c
> @@ -1366,12 +1366,14 @@ static int __spi_async(struct spi_device *spi, struct spi_message *message)
>  	}
>  
>  	/**
> -	 * Set transfer bits_per_word as spi device default if it is not
> -	 * set for this transfer.
> +	 * Set transfer bits_per_word and max speed as spi device default if
> +	 * it is not set for this transfer.
>  	 */
>  	list_for_each_entry(xfer, &message->transfers, transfer_list) {
>  		if (!xfer->bits_per_word)
>  			xfer->bits_per_word = spi->bits_per_word;
> +		if (!xfer->speed_hz)
> +			xfer->speed_hz = spi->max_speed_hz;
>  	}
>  
>  	message->spi = spi;
> -- 
> 1.7.1.1
> 

-- 
Grant Likely, B.Sc, P.Eng.
Secret Lab Technologies, Ltd.