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authorDmitry Eremin-Solenikov <dbaryshkov@gmail.com>2014-10-24 21:19:57 +0400
committerLee Jones <lee.jones@linaro.org>2014-11-25 16:18:52 +0000
commit1a5fb99de4850cba710d91becfa2c65653048589 (patch)
tree2c58155932011052cd0526466b74f0a1d5512c9c /drivers/mfd
parentbde3e706a63d5c258b3e4f5e327bcf032fb1adfe (diff)
mfd: tc6393xb: Fail ohci suspend if full state restore is required
Some boards with TC6393XB chip require full state restore during system resume thanks to chip's VCC being cut off during suspend (Sharp SL-6000 tosa is one of them). Failing to do so would result in ohci Oops on resume due to internal memory contentes being changed. Fail ohci suspend on tc6393xb is full state restore is required. Recommended workaround is to unbind tmio-ohci driver before suspend and rebind it after resume. Cc: stable@vger.kernel.org Signed-off-by: Dmitry Eremin-Solenikov <dbaryshkov@gmail.com> Signed-off-by: Lee Jones <lee.jones@linaro.org>
Diffstat (limited to 'drivers/mfd')
-rw-r--r--drivers/mfd/tc6393xb.c13
1 files changed, 12 insertions, 1 deletions
diff --git a/drivers/mfd/tc6393xb.c b/drivers/mfd/tc6393xb.c
index 4fac16bcd732..0afddf6c37af 100644
--- a/drivers/mfd/tc6393xb.c
+++ b/drivers/mfd/tc6393xb.c
@@ -263,6 +263,17 @@ static int tc6393xb_ohci_disable(struct platform_device *dev)
return 0;
}
+static int tc6393xb_ohci_suspend(struct platform_device *dev)
+{
+ struct tc6393xb_platform_data *tcpd = dev_get_platdata(dev->dev.parent);
+
+ /* We can't properly store/restore OHCI state, so fail here */
+ if (tcpd->resume_restore)
+ return -EBUSY;
+
+ return tc6393xb_ohci_disable(dev);
+}
+
static int tc6393xb_fb_enable(struct platform_device *dev)
{
struct tc6393xb *tc6393xb = dev_get_drvdata(dev->dev.parent);
@@ -403,7 +414,7 @@ static struct mfd_cell tc6393xb_cells[] = {
.num_resources = ARRAY_SIZE(tc6393xb_ohci_resources),
.resources = tc6393xb_ohci_resources,
.enable = tc6393xb_ohci_enable,
- .suspend = tc6393xb_ohci_disable,
+ .suspend = tc6393xb_ohci_suspend,
.resume = tc6393xb_ohci_enable,
.disable = tc6393xb_ohci_disable,
},