[PATCH 1/2] spi: atmel: factorize reusable code for SPI controller init

[PATCH 1/2] spi: atmel: factorize reusable code for SPI controller init

[Quentin Schulz]

The SPI controller configuration during the init can be reused, for the
resume function for example.

Let's move this configuration to a separate function.

Signed-off-by: Quentin Schulz <quentin.schulz-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>
---
 drivers/spi/spi-atmel.c | 35 +++++++++++++++++++++--------------
 1 file changed, 21 insertions(+), 14 deletions(-)

diff --git a/drivers/spi/spi-atmel.c b/drivers/spi/spi-atmel.c
index 0e7712b..247d920 100644
--- a/drivers/spi/spi-atmel.c
+++ b/drivers/spi/spi-atmel.c
@@ -1464,6 +1464,25 @@ static int atmel_spi_gpio_cs(struct platform_device *pdev)
 	return 0;
 }
 
+static void atmel_spi_init(struct atmel_spi *as)
+{
+	spi_writel(as, CR, SPI_BIT(SWRST));
+	spi_writel(as, CR, SPI_BIT(SWRST)); /* AT91SAM9263 Rev B workaround */
+	if (as->caps.has_wdrbt) {
+		spi_writel(as, MR, SPI_BIT(WDRBT) | SPI_BIT(MODFDIS)
+				| SPI_BIT(MSTR));
+	} else {
+		spi_writel(as, MR, SPI_BIT(MSTR) | SPI_BIT(MODFDIS));
+	}
+
+	if (as->use_pdc)
+		spi_writel(as, PTCR, SPI_BIT(RXTDIS) | SPI_BIT(TXTDIS));
+	spi_writel(as, CR, SPI_BIT(SPIEN));
+
+	if (as->fifo_size)
+		spi_writel(as, CR, SPI_BIT(FIFOEN));
+}
+
 static int atmel_spi_probe(struct platform_device *pdev)
 {
 	struct resource		*regs;
@@ -1572,26 +1591,14 @@ static int atmel_spi_probe(struct platform_device *pdev)
 
 	as->spi_clk = clk_get_rate(clk);
 
-	spi_writel(as, CR, SPI_BIT(SWRST));
-	spi_writel(as, CR, SPI_BIT(SWRST)); /* AT91SAM9263 Rev B workaround */
-	if (as->caps.has_wdrbt) {
-		spi_writel(as, MR, SPI_BIT(WDRBT) | SPI_BIT(MODFDIS)
-				| SPI_BIT(MSTR));
-	} else {
-		spi_writel(as, MR, SPI_BIT(MSTR) | SPI_BIT(MODFDIS));
-	}
-
-	if (as->use_pdc)
-		spi_writel(as, PTCR, SPI_BIT(RXTDIS) | SPI_BIT(TXTDIS));
-	spi_writel(as, CR, SPI_BIT(SPIEN));
-
 	as->fifo_size = 0;
 	if (!of_property_read_u32(pdev->dev.of_node, "atmel,fifo-size",
 				  &as->fifo_size)) {
 		dev_info(&pdev->dev, "Using FIFO (%u data)\n", as->fifo_size);
-		spi_writel(as, CR, SPI_BIT(FIFOEN));
 	}
 
+	atmel_spi_init(as);
+
 	pm_runtime_set_autosuspend_delay(&pdev->dev, AUTOSUSPEND_TIMEOUT);
 	pm_runtime_use_autosuspend(&pdev->dev);
 	pm_runtime_set_active(&pdev->dev);
-- 
2.9.3

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[PATCH 2/2] spi: atmel: add PM support to SAMA5D2

[Quentin Schulz]

This adds PM support to the ATMEL SAMA5D2 Xplained.

When suspending, VDDCore is shut down and the SPI registers are lost.
Thus, the SPI controller needs to be re-initialized after resuming from
a system suspend.

Signed-off-by: Quentin Schulz <quentin.schulz-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>
---
 drivers/spi/spi-atmel.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/spi/spi-atmel.c b/drivers/spi/spi-atmel.c
index 247d920..1eb83c9 100644
--- a/drivers/spi/spi-atmel.c
+++ b/drivers/spi/spi-atmel.c
@@ -1702,8 +1702,17 @@ static int atmel_spi_suspend(struct device *dev)
 static int atmel_spi_resume(struct device *dev)
 {
 	struct spi_master *master = dev_get_drvdata(dev);
+	struct atmel_spi *as = spi_master_get_devdata(master);
 	int ret;
 
+	ret = clk_prepare_enable(as->clk);
+	if (ret)
+		return ret;
+
+	atmel_spi_init(as);
+
+	clk_disable_unprepare(as->clk);
+
 	if (!pm_runtime_suspended(dev)) {
 		ret = atmel_spi_runtime_resume(dev);
 		if (ret)
-- 
2.9.3

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Re: [PATCH 2/2] spi: atmel: add PM support to SAMA5D2

[Nicolas Ferre]

Le 12/04/2017 à 09:05, Quentin Schulz a écrit :
> This adds PM support to the ATMEL SAMA5D2 Xplained.

Well not only for this board. The Backup+Self-Refresh PM state is
available for all boards using the SAMA5D2 SoC (and beyond)...

> When suspending, VDDCore is shut down and the SPI registers are lost.

Yes, but only on sama5d2 and only if the Backup+Self-Refresh (or deepest
PM state on sama5d2).

> Thus, the SPI controller needs to be re-initialized after resuming from
> a system suspend.
> 
> Signed-off-by: Quentin Schulz <quentin.schulz-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>

I'm okay with the core of the patch but would prefer a modified commit
message.

Best regards,

> ---
>  drivers/spi/spi-atmel.c | 9 +++++++++
>  1 file changed, 9 insertions(+)
> 
> diff --git a/drivers/spi/spi-atmel.c b/drivers/spi/spi-atmel.c
> index 247d920..1eb83c9 100644
> --- a/drivers/spi/spi-atmel.c
> +++ b/drivers/spi/spi-atmel.c
> @@ -1702,8 +1702,17 @@ static int atmel_spi_suspend(struct device *dev)
>  static int atmel_spi_resume(struct device *dev)
>  {
>  	struct spi_master *master = dev_get_drvdata(dev);
> +	struct atmel_spi *as = spi_master_get_devdata(master);
>  	int ret;
>  
> +	ret = clk_prepare_enable(as->clk);
> +	if (ret)
> +		return ret;
> +
> +	atmel_spi_init(as);
> +
> +	clk_disable_unprepare(as->clk);
> +
>  	if (!pm_runtime_suspended(dev)) {
>  		ret = atmel_spi_runtime_resume(dev);
>  		if (ret)
> 


-- 
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Applied "spi: atmel: add deepest PM support to SAMA5D2" to the spi tree

[Mark Brown]

The patch

   spi: atmel: add deepest PM support to SAMA5D2

has been applied to the spi tree at

   git://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi.git 

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.  

You may get further e-mails resulting from automated or manual testing
and review of the tree, please engage with people reporting problems and
send followup patches addressing any issues that are reported if needed.

If any updates are required or you are submitting further changes they
should be sent as incremental updates against current git, existing
patches will not be replaced.

Please add any relevant lists and maintainers to the CCs when replying
to this mail.

Thanks,
Mark

>From e53800787a251d67e532fadf72886be0661aba12 Mon Sep 17 00:00:00 2001
From: Quentin Schulz <quentin.schulz@free-electrons.com>
Date: Fri, 14 Apr 2017 10:22:43 +0200
Subject: [PATCH] spi: atmel: add deepest PM support to SAMA5D2

This adds deepest (Backup+Self-Refresh) PM support to the ATMEL SAMA5D2
SoC's SPI controller.

When resuming from deepest state, it is required to restore MR register
as the registers are lost since VDD core has been shut down when
entering deepest state on the SAMA5D2.

Signed-off-by: Quentin Schulz <quentin.schulz@free-electrons.com>
Acked-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Acked-by: Nicolas Ferre <nicolas.ferre@microchip.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
---
 drivers/spi/spi-atmel.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/spi/spi-atmel.c b/drivers/spi/spi-atmel.c
index 247d920a512f..1eb83c9613d5 100644
--- a/drivers/spi/spi-atmel.c
+++ b/drivers/spi/spi-atmel.c
@@ -1702,8 +1702,17 @@ static int atmel_spi_suspend(struct device *dev)
 static int atmel_spi_resume(struct device *dev)
 {
 	struct spi_master *master = dev_get_drvdata(dev);
+	struct atmel_spi *as = spi_master_get_devdata(master);
 	int ret;
 
+	ret = clk_prepare_enable(as->clk);
+	if (ret)
+		return ret;
+
+	atmel_spi_init(as);
+
+	clk_disable_unprepare(as->clk);
+
 	if (!pm_runtime_suspended(dev)) {
 		ret = atmel_spi_runtime_resume(dev);
 		if (ret)
-- 
2.11.0

Re: [PATCH 1/2] spi: atmel: factorize reusable code for SPI controller init

[Nicolas Ferre]

Le 12/04/2017 à 09:05, Quentin Schulz a écrit :
> The SPI controller configuration during the init can be reused, for the
> resume function for example.
> 
> Let's move this configuration to a separate function.
> 
> Signed-off-by: Quentin Schulz <quentin.schulz-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>

Okay:
Acked-by: Nicolas Ferre <nicolas.ferre-UWL1GkI3JZL3oGB3hsPCZA@public.gmane.org>

> ---
>  drivers/spi/spi-atmel.c | 35 +++++++++++++++++++++--------------
>  1 file changed, 21 insertions(+), 14 deletions(-)
> 
> diff --git a/drivers/spi/spi-atmel.c b/drivers/spi/spi-atmel.c
> index 0e7712b..247d920 100644
> --- a/drivers/spi/spi-atmel.c
> +++ b/drivers/spi/spi-atmel.c
> @@ -1464,6 +1464,25 @@ static int atmel_spi_gpio_cs(struct platform_device *pdev)
>  	return 0;
>  }
>  
> +static void atmel_spi_init(struct atmel_spi *as)
> +{
> +	spi_writel(as, CR, SPI_BIT(SWRST));
> +	spi_writel(as, CR, SPI_BIT(SWRST)); /* AT91SAM9263 Rev B workaround */
> +	if (as->caps.has_wdrbt) {
> +		spi_writel(as, MR, SPI_BIT(WDRBT) | SPI_BIT(MODFDIS)
> +				| SPI_BIT(MSTR));
> +	} else {
> +		spi_writel(as, MR, SPI_BIT(MSTR) | SPI_BIT(MODFDIS));
> +	}
> +
> +	if (as->use_pdc)
> +		spi_writel(as, PTCR, SPI_BIT(RXTDIS) | SPI_BIT(TXTDIS));
> +	spi_writel(as, CR, SPI_BIT(SPIEN));
> +
> +	if (as->fifo_size)
> +		spi_writel(as, CR, SPI_BIT(FIFOEN));
> +}
> +
>  static int atmel_spi_probe(struct platform_device *pdev)
>  {
>  	struct resource		*regs;
> @@ -1572,26 +1591,14 @@ static int atmel_spi_probe(struct platform_device *pdev)
>  
>  	as->spi_clk = clk_get_rate(clk);
>  
> -	spi_writel(as, CR, SPI_BIT(SWRST));
> -	spi_writel(as, CR, SPI_BIT(SWRST)); /* AT91SAM9263 Rev B workaround */
> -	if (as->caps.has_wdrbt) {
> -		spi_writel(as, MR, SPI_BIT(WDRBT) | SPI_BIT(MODFDIS)
> -				| SPI_BIT(MSTR));
> -	} else {
> -		spi_writel(as, MR, SPI_BIT(MSTR) | SPI_BIT(MODFDIS));
> -	}
> -
> -	if (as->use_pdc)
> -		spi_writel(as, PTCR, SPI_BIT(RXTDIS) | SPI_BIT(TXTDIS));
> -	spi_writel(as, CR, SPI_BIT(SPIEN));
> -
>  	as->fifo_size = 0;
>  	if (!of_property_read_u32(pdev->dev.of_node, "atmel,fifo-size",
>  				  &as->fifo_size)) {
>  		dev_info(&pdev->dev, "Using FIFO (%u data)\n", as->fifo_size);
> -		spi_writel(as, CR, SPI_BIT(FIFOEN));
>  	}
>  
> +	atmel_spi_init(as);
> +
>  	pm_runtime_set_autosuspend_delay(&pdev->dev, AUTOSUSPEND_TIMEOUT);
>  	pm_runtime_use_autosuspend(&pdev->dev);
>  	pm_runtime_set_active(&pdev->dev);
> 


-- 
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Applied "spi: atmel: factorize reusable code for SPI controller init" to the spi tree

[Mark Brown]

The patch

   spi: atmel: factorize reusable code for SPI controller init

has been applied to the spi tree at

   git://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi.git 

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.  

You may get further e-mails resulting from automated or manual testing
and review of the tree, please engage with people reporting problems and
send followup patches addressing any issues that are reported if needed.

If any updates are required or you are submitting further changes they
should be sent as incremental updates against current git, existing
patches will not be replaced.

Please add any relevant lists and maintainers to the CCs when replying
to this mail.

Thanks,
Mark

>From 05514c86965f98f9b0e57f73700771fa267050a7 Mon Sep 17 00:00:00 2001
From: Quentin Schulz <quentin.schulz-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>
Date: Wed, 12 Apr 2017 09:05:19 +0200
Subject: [PATCH] spi: atmel: factorize reusable code for SPI controller init

The SPI controller configuration during the init can be reused, for the
resume function for example.

Let's move this configuration to a separate function.

Signed-off-by: Quentin Schulz <quentin.schulz-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>
Acked-by: Nicolas Ferre <nicolas.ferre-UWL1GkI3JZL3oGB3hsPCZA@public.gmane.org>
Signed-off-by: Mark Brown <broonie-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
---
 drivers/spi/spi-atmel.c | 35 +++++++++++++++++++++--------------
 1 file changed, 21 insertions(+), 14 deletions(-)

diff --git a/drivers/spi/spi-atmel.c b/drivers/spi/spi-atmel.c
index 0e7712bac3b6..247d920a512f 100644
--- a/drivers/spi/spi-atmel.c
+++ b/drivers/spi/spi-atmel.c
@@ -1464,6 +1464,25 @@ static int atmel_spi_gpio_cs(struct platform_device *pdev)
 	return 0;
 }
 
+static void atmel_spi_init(struct atmel_spi *as)
+{
+	spi_writel(as, CR, SPI_BIT(SWRST));
+	spi_writel(as, CR, SPI_BIT(SWRST)); /* AT91SAM9263 Rev B workaround */
+	if (as->caps.has_wdrbt) {
+		spi_writel(as, MR, SPI_BIT(WDRBT) | SPI_BIT(MODFDIS)
+				| SPI_BIT(MSTR));
+	} else {
+		spi_writel(as, MR, SPI_BIT(MSTR) | SPI_BIT(MODFDIS));
+	}
+
+	if (as->use_pdc)
+		spi_writel(as, PTCR, SPI_BIT(RXTDIS) | SPI_BIT(TXTDIS));
+	spi_writel(as, CR, SPI_BIT(SPIEN));
+
+	if (as->fifo_size)
+		spi_writel(as, CR, SPI_BIT(FIFOEN));
+}
+
 static int atmel_spi_probe(struct platform_device *pdev)
 {
 	struct resource		*regs;
@@ -1572,26 +1591,14 @@ static int atmel_spi_probe(struct platform_device *pdev)
 
 	as->spi_clk = clk_get_rate(clk);
 
-	spi_writel(as, CR, SPI_BIT(SWRST));
-	spi_writel(as, CR, SPI_BIT(SWRST)); /* AT91SAM9263 Rev B workaround */
-	if (as->caps.has_wdrbt) {
-		spi_writel(as, MR, SPI_BIT(WDRBT) | SPI_BIT(MODFDIS)
-				| SPI_BIT(MSTR));
-	} else {
-		spi_writel(as, MR, SPI_BIT(MSTR) | SPI_BIT(MODFDIS));
-	}
-
-	if (as->use_pdc)
-		spi_writel(as, PTCR, SPI_BIT(RXTDIS) | SPI_BIT(TXTDIS));
-	spi_writel(as, CR, SPI_BIT(SPIEN));
-
 	as->fifo_size = 0;
 	if (!of_property_read_u32(pdev->dev.of_node, "atmel,fifo-size",
 				  &as->fifo_size)) {
 		dev_info(&pdev->dev, "Using FIFO (%u data)\n", as->fifo_size);
-		spi_writel(as, CR, SPI_BIT(FIFOEN));
 	}
 
+	atmel_spi_init(as);
+
 	pm_runtime_set_autosuspend_delay(&pdev->dev, AUTOSUSPEND_TIMEOUT);
 	pm_runtime_use_autosuspend(&pdev->dev);
 	pm_runtime_set_active(&pdev->dev);
-- 
2.11.0

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