diff mbox

[V2] PCI: rcar: Use runtime PM to control controller clock

Message ID 20171108095816.14192-1-marek.vasut+renesas@gmail.com (mailing list archive)
State New, archived
Delegated to: Bjorn Helgaas
Headers show

Commit Message

Marek Vasut Nov. 8, 2017, 9:58 a.m. UTC 
From: Dien Pham <dien.pham.ry@rvc.renesas.com>

The controller clock can be switched off during suspend/resume,
let runtime PM take care of that.

Signed-off-by: Dien Pham <dien.pham.ry@rvc.renesas.com>
Signed-off-by: Hien Dang <hien.dang.eb@renesas.com>
Signed-off-by: Marek Vasut <marek.vasut+renesas@gmail.com>
Cc: Geert Uytterhoeven <geert+renesas@glider.be>
Cc: Simon Horman <horms+renesas@verge.net.au>
Cc: Wolfram Sang <wsa@the-dreams.de>
Cc: linux-renesas-soc@vger.kernel.org
To: linux-pci@vger.kernel.org
---
V2: - Reorder the fail path in rcar_pcie_probe() to cater for the
      reordering of function calls in probe
    - Dispose of fail_clk in rcar_pcie_get_resources()
---
 drivers/pci/host/pcie-rcar.c | 37 ++++++++++++-------------------------
 1 file changed, 12 insertions(+), 25 deletions(-)

Comments

Geert Uytterhoeven Nov. 8, 2017, 10:08 a.m. UTC | #1 
Hi Marek,

On Wed, Nov 8, 2017 at 10:58 AM, Marek Vasut <marek.vasut@gmail.com> wrote:
> From: Dien Pham <dien.pham.ry@rvc.renesas.com>
>
> The controller clock can be switched off during suspend/resume,
> let runtime PM take care of that.
>
> Signed-off-by: Dien Pham <dien.pham.ry@rvc.renesas.com>
> Signed-off-by: Hien Dang <hien.dang.eb@renesas.com>
> Signed-off-by: Marek Vasut <marek.vasut+renesas@gmail.com>

> --- a/drivers/pci/host/pcie-rcar.c
> +++ b/drivers/pci/host/pcie-rcar.c
> @@ -1125,6 +1112,13 @@ static int rcar_pcie_probe(struct platform_device *pdev)
>
>         rcar_pcie_parse_request_of_pci_ranges(pcie);
>
> +       pm_runtime_enable(pcie->dev);
> +       err = pm_runtime_get_sync(pcie->dev);
> +       if (err < 0) {
> +               dev_err(pcie->dev, "pm_runtime_get_sync failed\n");
> +               goto err_pm_disable;
> +       }
> +
>         err = rcar_pcie_get_resources(pcie);
>         if (err < 0) {
>                 dev_err(dev, "failed to request resources: %d\n", err);

(out of context)
                 goto err_free_bridge;

But that should do pm_runtime_put(), too.

> @@ -1135,13 +1129,6 @@ static int rcar_pcie_probe(struct platform_device *pdev)
>         if (err)
>                 goto err_free_bridge;
>
> -       pm_runtime_enable(dev);
> -       err = pm_runtime_get_sync(dev);
> -       if (err < 0) {
> -               dev_err(dev, "pm_runtime_get_sync failed\n");
> -               goto err_pm_disable;
> -       }
> -
>         /* Failure to get a link might just be that no cards are inserted */
>         hw_init_fn = of_device_get_match_data(dev);
>         err = hw_init_fn(pcie);
> @@ -1173,13 +1160,13 @@ static int rcar_pcie_probe(struct platform_device *pdev)
>  err_pm_put:
>         pm_runtime_put(dev);

"err_pm_put" should be moved, too.

> -err_pm_disable:
> -       pm_runtime_disable(dev);
> -
>  err_free_bridge:
>         pci_free_host_bridge(bridge);
>         pci_free_resource_list(&pcie->resources);
>
> +err_pm_disable:
> +       pm_runtime_disable(dev);
> +
>         return err;
>  }

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds
Marek Vasut Nov. 10, 2017, 8:34 p.m. UTC | #2 
On 11/08/2017 11:08 AM, Geert Uytterhoeven wrote:
> Hi Marek,

Hi Geert,

> On Wed, Nov 8, 2017 at 10:58 AM, Marek Vasut <marek.vasut@gmail.com> wrote:
>> From: Dien Pham <dien.pham.ry@rvc.renesas.com>
>>
>> The controller clock can be switched off during suspend/resume,
>> let runtime PM take care of that.
>>
>> Signed-off-by: Dien Pham <dien.pham.ry@rvc.renesas.com>
>> Signed-off-by: Hien Dang <hien.dang.eb@renesas.com>
>> Signed-off-by: Marek Vasut <marek.vasut+renesas@gmail.com>
> 
>> --- a/drivers/pci/host/pcie-rcar.c
>> +++ b/drivers/pci/host/pcie-rcar.c
>> @@ -1125,6 +1112,13 @@ static int rcar_pcie_probe(struct platform_device *pdev)
>>
>>         rcar_pcie_parse_request_of_pci_ranges(pcie);
>>
>> +       pm_runtime_enable(pcie->dev);
>> +       err = pm_runtime_get_sync(pcie->dev);
>> +       if (err < 0) {
>> +               dev_err(pcie->dev, "pm_runtime_get_sync failed\n");
>> +               goto err_pm_disable;
>> +       }
>> +
>>         err = rcar_pcie_get_resources(pcie);
>>         if (err < 0) {
>>                 dev_err(dev, "failed to request resources: %d\n", err);
> 
> (out of context)
>                  goto err_free_bridge;
> 
> But that should do pm_runtime_put(), too.
> 
>> @@ -1135,13 +1129,6 @@ static int rcar_pcie_probe(struct platform_device *pdev)
>>         if (err)
>>                 goto err_free_bridge;
>>
>> -       pm_runtime_enable(dev);
>> -       err = pm_runtime_get_sync(dev);
>> -       if (err < 0) {
>> -               dev_err(dev, "pm_runtime_get_sync failed\n");
>> -               goto err_pm_disable;
>> -       }
>> -
>>         /* Failure to get a link might just be that no cards are inserted */
>>         hw_init_fn = of_device_get_match_data(dev);
>>         err = hw_init_fn(pcie);
>> @@ -1173,13 +1160,13 @@ static int rcar_pcie_probe(struct platform_device *pdev)
>>  err_pm_put:
>>         pm_runtime_put(dev);
> 
> "err_pm_put" should be moved, too.

ACK. I combed through the probe function one more time and I hope I'll
have it right in V3.

>> -err_pm_disable:
>> -       pm_runtime_disable(dev);
>> -
>>  err_free_bridge:
>>         pci_free_host_bridge(bridge);
>>         pci_free_resource_list(&pcie->resources);

^ IMO this should happen after pm_runtime_disable too , just to be
consistent.

>> +err_pm_disable:
>> +       pm_runtime_disable(dev);
>> +
>>         return err;
>>  }

[...]
diff mbox

Patch

diff --git a/drivers/pci/host/pcie-rcar.c b/drivers/pci/host/pcie-rcar.c
index 12796eccb2be..1a7254ec16da 100644
--- a/drivers/pci/host/pcie-rcar.c
+++ b/drivers/pci/host/pcie-rcar.c
@@ -145,7 +145,6 @@  struct rcar_pcie {
 	void __iomem		*base;
 	struct list_head	resources;
 	int			root_bus_nr;
-	struct clk		*clk;
 	struct clk		*bus_clk;
 	struct			rcar_msi msi;
 };
@@ -917,24 +916,14 @@  static int rcar_pcie_get_resources(struct rcar_pcie *pcie)
 	if (IS_ERR(pcie->base))
 		return PTR_ERR(pcie->base);
 
-	pcie->clk = devm_clk_get(dev, "pcie");
-	if (IS_ERR(pcie->clk)) {
-		dev_err(dev, "cannot get platform clock\n");
-		return PTR_ERR(pcie->clk);
-	}
-	err = clk_prepare_enable(pcie->clk);
-	if (err)
-		return err;
-
 	pcie->bus_clk = devm_clk_get(dev, "pcie_bus");
 	if (IS_ERR(pcie->bus_clk)) {
 		dev_err(dev, "cannot get pcie bus clock\n");
-		err = PTR_ERR(pcie->bus_clk);
-		goto fail_clk;
+		return PTR_ERR(pcie->bus_clk);
 	}
 	err = clk_prepare_enable(pcie->bus_clk);
 	if (err)
-		goto fail_clk;
+		return err;
 
 	i = irq_of_parse_and_map(dev->of_node, 0);
 	if (!i) {
@@ -956,8 +945,6 @@  static int rcar_pcie_get_resources(struct rcar_pcie *pcie)
 
 err_map_reg:
 	clk_disable_unprepare(pcie->bus_clk);
-fail_clk:
-	clk_disable_unprepare(pcie->clk);
 
 	return err;
 }
@@ -1125,6 +1112,13 @@  static int rcar_pcie_probe(struct platform_device *pdev)
 
 	rcar_pcie_parse_request_of_pci_ranges(pcie);
 
+	pm_runtime_enable(pcie->dev);
+	err = pm_runtime_get_sync(pcie->dev);
+	if (err < 0) {
+		dev_err(pcie->dev, "pm_runtime_get_sync failed\n");
+		goto err_pm_disable;
+	}
+
 	err = rcar_pcie_get_resources(pcie);
 	if (err < 0) {
 		dev_err(dev, "failed to request resources: %d\n", err);
@@ -1135,13 +1129,6 @@  static int rcar_pcie_probe(struct platform_device *pdev)
 	if (err)
 		goto err_free_bridge;
 
-	pm_runtime_enable(dev);
-	err = pm_runtime_get_sync(dev);
-	if (err < 0) {
-		dev_err(dev, "pm_runtime_get_sync failed\n");
-		goto err_pm_disable;
-	}
-
 	/* Failure to get a link might just be that no cards are inserted */
 	hw_init_fn = of_device_get_match_data(dev);
 	err = hw_init_fn(pcie);
@@ -1173,13 +1160,13 @@  static int rcar_pcie_probe(struct platform_device *pdev)
 err_pm_put:
 	pm_runtime_put(dev);
 
-err_pm_disable:
-	pm_runtime_disable(dev);
-
 err_free_bridge:
 	pci_free_host_bridge(bridge);
 	pci_free_resource_list(&pcie->resources);
 
+err_pm_disable:
+	pm_runtime_disable(dev);
+
 	return err;
 }