linux-kernel - [PATCH AUTOSEL 4.9 101/141] usb: musb: omap2430: Get rid of musb .set

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Message-Id: <20200214162122.19794-101-sashal@kernel.org>
Date:   Fri, 14 Feb 2020 11:20:41 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Tony Lindgren <tony@...mide.com>, Pavel Machek <pavel@....cz>,
        Bin Liu <b-liu@...com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Sasha Levin <sashal@...nel.org>, linux-usb@...r.kernel.org,
        linux-omap@...r.kernel.org
Subject: [PATCH AUTOSEL 4.9 101/141] usb: musb: omap2430: Get rid of musb .set_vbus for omap2430 glue

From: Tony Lindgren <tony@...mide.com>

[ Upstream commit 91b6dec32e5c25fbdbb564d1e5af23764ec17ef1 ]

We currently have musb_set_vbus() called from two different paths. Mostly
it gets called from the USB PHY via omap_musb_set_mailbox(), but in some
cases it can get also called from musb_stage0_irq() rather via .set_vbus:

(musb_set_host [musb_hdrc])
(omap2430_musb_set_vbus [omap2430])
(musb_stage0_irq [musb_hdrc])
(musb_interrupt [musb_hdrc])
(omap2430_musb_interrupt [omap2430])

This is racy and will not work with introducing generic helper functions
for musb_set_host() and musb_set_peripheral(). We want to get rid of the
busy loops in favor of usleep_range().

Let's just get rid of .set_vbus for omap2430 glue layer and let the PHY
code handle VBUS with musb_set_vbus(). Note that in the follow-up patch
we can completely remove omap2430_musb_set_vbus(), but let's do it in a
separate patch as this change may actually turn out to be needed as a
fix.

Reported-by: Pavel Machek <pavel@....cz>
Acked-by: Pavel Machek <pavel@....cz>
Signed-off-by: Tony Lindgren <tony@...mide.com>
Signed-off-by: Bin Liu <b-liu@...com>
Link: https://lore.kernel.org/r/20200115132547.364-5-b-liu@ti.com
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/usb/musb/omap2430.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/drivers/usb/musb/omap2430.c b/drivers/usb/musb/omap2430.c
index e8be8e39ab8fb..457ad33f4caa8 100644
--- a/drivers/usb/musb/omap2430.c
+++ b/drivers/usb/musb/omap2430.c
@@ -388,8 +388,6 @@ static const struct musb_platform_ops omap2430_ops = {
 	.init		= omap2430_musb_init,
 	.exit		= omap2430_musb_exit,
 
-	.set_vbus	= omap2430_musb_set_vbus,
-
 	.enable		= omap2430_musb_enable,
 	.disable	= omap2430_musb_disable,
 
-- 
2.20.1