usb: musb: fix some runtime_pm issues

When runtime_pm was originally added, it was done in rather confusing
way: omap2430_musb_init() (called from musb_init_controller) would do
runtime_pm_get_sync() and musb_init_controller() itself would do
runtime_pm_put to balance it out. This is not only confusing but also
wrong if non-omap2430 glue layer is used.

This confusion resulted in commit 772aed45b604 "usb: musb: fix
pm_runtime mismatch", that removed runtime_pm_put() from
musb_init_controller as that looked unbalanced, and also happened to
fix unrelated isp1704_charger crash. However this broke runtime PM
functionality (musb is now always powered, even without gadget active).

Avoid these confusing runtime pm dependences by making
musb_init_controller() and omap2430_musb_init() do their own runtime
get/put pairs; also cover error paths. Remove unneeded runtime_pm_put
in omap2430_remove too. isp1704_charger crash that motivated
772aed45b604 will be fixed by following patch.

Cc: Felipe Contreras <felipe.contreras@gmail.com>
Signed-off-by: Grazvydas Ignotas <notasas@gmail.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>

1 files changed, 8 insertions, 1 deletions

diff --git a/drivers/usb/musb/musb_core.c b/drivers/usb/musb/musb_core.c
index 0f8b82918a40..239214626ec5 100644
--- a/drivers/usb/musb/musb_core.c
+++ b/drivers/usb/musb/musb_core.c
@@ -1904,7 +1904,7 @@ musb_init_controller(struct device *dev, int nIrq, void __iomem *ctrl)
 
         if (!musb->isr) {
                 status = -ENODEV;
-                goto fail3;
+                goto fail2;
         }
 
         if (!musb->xceiv->io_ops) {
@@ -1912,6 +1912,8 @@ musb_init_controller(struct device *dev, int nIrq, void __iomem *ctrl)
                 musb->xceiv->io_ops = &musb_ulpi_access;
         }
 
+        pm_runtime_get_sync(musb->controller);
+
 #ifndef CONFIG_MUSB_PIO_ONLY
         if (use_dma && dev->dma_mask) {
                 struct dma_controller   *c;
@@ -2023,6 +2025,8 @@ musb_init_controller(struct device *dev, int nIrq, void __iomem *ctrl)
                 goto fail5;
 #endif
 
+        pm_runtime_put(musb->controller);
+
         dev_info(dev, "USB %s mode controller at %p using %s, IRQ %d\n",
                         ({char *s;
                          switch (musb->board_mode) {
@@ -2047,6 +2051,9 @@ fail4:
                 musb_gadget_cleanup(musb);
 
 fail3:
+        pm_runtime_put_sync(musb->controller);
+
+fail2:
         if (musb->irq_wake)
                 device_init_wakeup(dev, 0);
         musb_platform_exit(musb);