This is a note to let you know that I've just added the patch titled
usb: renesas_usbhs: add wait after initialization for R-Car Gen3
to the 4.8-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
usb-renesas_usbhs-add-wait-after-initialization-for-r-car-gen3.patch
and it can be found in the queue-4.8 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From b76032396d7958f006bccf5fb2535beb5526837c Mon Sep 17 00:00:00 2001
From: Yoshihiro Shimoda <yoshihiro.shimoda.uh@xxxxxxxxxxx>
Date: Thu, 20 Oct 2016 13:19:19 +0900
Subject: usb: renesas_usbhs: add wait after initialization for R-Car Gen3
From: Yoshihiro Shimoda <yoshihiro.shimoda.uh@xxxxxxxxxxx>
commit b76032396d7958f006bccf5fb2535beb5526837c upstream.
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: <balbi@xxxxxxxxxx>
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@xxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/usb/renesas_usbhs/rcar3.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)
--- 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
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;
}
Patches currently in stable-queue which might be from yoshihiro.shimoda.uh@xxxxxxxxxxx are
queue-4.8/usb-renesas_usbhs-add-wait-after-initialization-for-r-car-gen3.patch
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