diff options
| author | Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com> | 2016-10-20 07:19:19 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-10-24 15:35:46 +0300 |
| commit | b76032396d7958f006bccf5fb2535beb5526837c (patch) | |
| tree | a445204f4d0a5bdf22f02741b373a56a700e11ea /drivers/usb | |
| parent | ed6d6f8f42d7302f6f9b6245f34927ec20d26c12 (diff) | |
| download | linux-b76032396d7958f006bccf5fb2535beb5526837c.tar.xz | |
usb: renesas_usbhs: add wait after initialization for R-Car Gen3
Since the controller on R-Car Gen3 doesn't have any status registers
to detect initialization (LPSTS.SUSPM = 1) and the initialization needs
up to 45 usec, this patch adds wait after the initialization. Otherwise,
writing other registers (e.g. INTENB0) will fail.
Fixes: de18757e272d ("usb: renesas_usbhs: add R-Car Gen3 power control")
Cc: <stable@vger.kernel.org> # v4.6+
Cc: <balbi@kernel.org>
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb')
| -rw-r--r-- | drivers/usb/renesas_usbhs/rcar3.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/drivers/usb/renesas_usbhs/rcar3.c b/drivers/usb/renesas_usbhs/rcar3.c index 1d70add926f0..d544b331c9f2 100644 --- a/drivers/usb/renesas_usbhs/rcar3.c +++ b/drivers/usb/renesas_usbhs/rcar3.c @@ -9,6 +9,7 @@ * */ +#include <linux/delay.h> #include <linux/io.h> #include "common.h" #include "rcar3.h" @@ -35,10 +36,13 @@ static int usbhs_rcar3_power_ctrl(struct platform_device *pdev, usbhs_write32(priv, UGCTRL2, UGCTRL2_RESERVED_3 | UGCTRL2_USB0SEL_OTG); - if (enable) + if (enable) { usbhs_bset(priv, LPSTS, LPSTS_SUSPM, LPSTS_SUSPM); - else + /* The controller on R-Car Gen3 needs to wait up to 45 usec */ + udelay(45); + } else { usbhs_bset(priv, LPSTS, LPSTS_SUSPM, 0); + } return 0; } |