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Message-ID: <20240528102026.40136-5-bastien.curutchet@bootlin.com>
Date: Tue, 28 May 2024 12:20:26 +0200
From: Bastien Curutchet <bastien.curutchet@...tlin.com>
To: Vinod Koul <vkoul@...nel.org>,
Kishon Vijay Abraham I <kishon@...nel.org>,
Bin Liu <b-liu@...com>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: linux-phy@...ts.infradead.org,
linux-kernel@...r.kernel.org,
linux-usb@...r.kernel.org,
Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
herve.codina@...tlin.com,
christophercordahi@...ometrics.ca,
Bastien Curutchet <bastien.curutchet@...tlin.com>
Subject: [PATCH 4/4] usb: musb: da8xx: Implement BABBLE recovery
There is no specific behaviour implemented to recover from a babble
error. When a BABBLE error happens, recovery fails as connected sticks
are no longer detected by the USB controller.
Implement the recover callback of the MUSB operation to reset the USB
controller when a BABBLE happens.
Signed-off-by: Bastien Curutchet <bastien.curutchet@...tlin.com>
---
drivers/usb/musb/da8xx.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/drivers/usb/musb/da8xx.c b/drivers/usb/musb/da8xx.c
index c5cf733673a2..fcf06dcf2d61 100644
--- a/drivers/usb/musb/da8xx.c
+++ b/drivers/usb/musb/da8xx.c
@@ -220,6 +220,13 @@ static void __maybe_unused da8xx_musb_try_idle(struct musb *musb, unsigned long
mod_timer(&musb->dev_timer, timeout);
}
+static int da8xx_babble_recover(struct musb *musb)
+{
+ dev_dbg(musb->controller, "resetting controller to recover from babble\n");
+ musb_writel(musb->ctrl_base, DA8XX_USB_CTRL_REG, DA8XX_SOFT_RESET_MASK);
+ return 0;
+}
+
static irqreturn_t da8xx_musb_interrupt(int irq, void *hci)
{
struct musb *musb = hci;
@@ -480,6 +487,7 @@ static const struct musb_platform_ops da8xx_ops = {
#ifndef CONFIG_USB_MUSB_HOST
.try_idle = da8xx_musb_try_idle,
#endif
+ .recover = da8xx_babble_recover,
.set_vbus = da8xx_musb_set_vbus,
};
--
2.44.0
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