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authorGeert Uytterhoeven <geert+renesas@glider.be>2014-11-24 19:58:17 +0100
committerDavid S. Miller <davem@davemloft.net>2014-11-24 16:41:50 -0500
commit3a611e26e958b0372d2e7600b87bbb4a84c7704b (patch)
tree7cc0c1159e3852d4f54b9ec1e47930fb62bb1f07 /drivers/net/ethernet/smsc
parent4f0372150b1fbf2167cfe21d2e6eac1933fb36ac (diff)
net/smsc911x: Add minimal runtime PM support
Add minimal runtime PM support (enable on probe, disable on remove), to ensure proper operation with a parent device that uses runtime PM. This is needed on systems where the external bus controller module of the SoC is contained in a PM domain and/or has a gateable functional clock. In such cases, before accessing any device connected to the external bus, the PM domain must be powered up, and/or the functional clock must be enabled, which is typically handled through runtime PM by the bus controller driver. An example of this is the kzm9g development board, where an smsc9220 Ethernet controller is connected to the Bus State Controller (BSC) of a Renesas sh73a0 SoC. Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/ethernet/smsc')
-rw-r--r--drivers/net/ethernet/smsc/smsc911x.c10
1 files changed, 10 insertions, 0 deletions
diff --git a/drivers/net/ethernet/smsc/smsc911x.c b/drivers/net/ethernet/smsc/smsc911x.c
index 77ed74561e5f..f9c87624a0af 100644
--- a/drivers/net/ethernet/smsc/smsc911x.c
+++ b/drivers/net/ethernet/smsc/smsc911x.c
@@ -59,6 +59,8 @@
#include <linux/of_device.h>
#include <linux/of_gpio.h>
#include <linux/of_net.h>
+#include <linux/pm_runtime.h>
+
#include "smsc911x.h"
#define SMSC_CHIPNAME "smsc911x"
@@ -2338,6 +2340,9 @@ static int smsc911x_drv_remove(struct platform_device *pdev)
free_netdev(dev);
+ pm_runtime_put(&pdev->dev);
+ pm_runtime_disable(&pdev->dev);
+
return 0;
}
@@ -2491,6 +2496,9 @@ static int smsc911x_drv_probe(struct platform_device *pdev)
if (pdata->config.shift)
pdata->ops = &shifted_smsc911x_ops;
+ pm_runtime_enable(&pdev->dev);
+ pm_runtime_get_sync(&pdev->dev);
+
retval = smsc911x_init(dev);
if (retval < 0)
goto out_disable_resources;
@@ -2572,6 +2580,8 @@ out_unregister_netdev_5:
out_free_irq:
free_irq(dev->irq, dev);
out_disable_resources:
+ pm_runtime_put(&pdev->dev);
+ pm_runtime_disable(&pdev->dev);
(void)smsc911x_disable_resources(pdev);
out_enable_resources_fail:
smsc911x_free_resources(pdev);