patch "phy: renesas: rcar-gen3-usb2: Disable clearing VBUS in over-current" added to char-misc-testing

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This is a note to let you know that I've just added the patch titled

    phy: renesas: rcar-gen3-usb2: Disable clearing VBUS in over-current

to my char-misc git tree which can be found at
    git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc.git
in the char-misc-testing branch.

The patch will show up in the next release of the linux-next tree
(usually sometime within the next 24 hours during the week.)

The patch will be merged to the char-misc-next branch sometime soon,
after it passes testing, and the merge window is open.

If you have any questions about this process, please let me know.


>From e6839c31a608e79f2057fab987dd814f5d3477e6 Mon Sep 17 00:00:00 2001
From: Yoshihiro Shimoda <yoshihiro.shimoda.uh@xxxxxxxxxxx>
Date: Tue, 6 Aug 2019 17:51:19 +0900
Subject: phy: renesas: rcar-gen3-usb2: Disable clearing VBUS in over-current

The hardware manual should be revised, but the initial value of
VBCTRL.OCCLREN is set to 1 actually. If the bit is set, the hardware
clears VBCTRL.VBOUT and ADPCTRL.DRVVBUS registers automatically
when the hardware detects over-current signal from a USB power switch.
However, since the hardware doesn't have any registers which
indicates over-current, the driver cannot handle it at all. So, if
"is_otg_channel" hardware detects over-current, since ADPCTRL.DRVVBUS
register is cleared automatically, the channel cannot be used after
that.

To resolve this behavior, this patch sets the VBCTRL.OCCLREN to 0
to keep ADPCTRL.DRVVBUS even if the "is_otg_channel" hardware
detects over-current. (We assume a USB power switch itself protects
over-current and turns the VBUS off.)

This patch is inspired by a BSP patch from Kazuya Mizuguchi.

Fixes: 1114e2d31731 ("phy: rcar-gen3-usb2: change the mode to OTG on the combined channel")
Cc: <stable@xxxxxxxxxxxxxxx> # v4.5+
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@xxxxxxxxxxx>
Signed-off-by: Kishon Vijay Abraham I <kishon@xxxxxx>
---
 drivers/phy/renesas/phy-rcar-gen3-usb2.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/phy/renesas/phy-rcar-gen3-usb2.c b/drivers/phy/renesas/phy-rcar-gen3-usb2.c
index 8ffba67568ec..b7f6b1324395 100644
--- a/drivers/phy/renesas/phy-rcar-gen3-usb2.c
+++ b/drivers/phy/renesas/phy-rcar-gen3-usb2.c
@@ -61,6 +61,7 @@
 					 USB2_OBINT_IDDIGCHG)
 
 /* VBCTRL */
+#define USB2_VBCTRL_OCCLREN		BIT(16)
 #define USB2_VBCTRL_DRVVBUSSEL		BIT(8)
 
 /* LINECTRL1 */
@@ -374,6 +375,7 @@ static void rcar_gen3_init_otg(struct rcar_gen3_chan *ch)
 	writel(val, usb2_base + USB2_LINECTRL1);
 
 	val = readl(usb2_base + USB2_VBCTRL);
+	val &= ~USB2_VBCTRL_OCCLREN;
 	writel(val | USB2_VBCTRL_DRVVBUSSEL, usb2_base + USB2_VBCTRL);
 	val = readl(usb2_base + USB2_ADPCTRL);
 	writel(val | USB2_ADPCTRL_IDPULLUP, usb2_base + USB2_ADPCTRL);
-- 
2.23.0





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