From: Andrey Smirnov <andrew.smirnov@gmail.com>
To: linux-usb@vger.kernel.org
Cc: Andrey Smirnov <andrew.smirnov@gmail.com>,
Mathias Nyman <mathias.nyman@intel.com>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
linux-kernel@vger.kernel.org
Subject: [PATCH] xhci: Convert xhci_handshake() to use readl_poll_timeout()
Date: Wed, 6 Feb 2019 16:03:08 -0800 [thread overview]
Message-ID: <20190207000308.7051-1-andrew.smirnov@gmail.com> (raw)
Xhci_handshake() implements the algorithm already captured by
readl_poll_timeout(). Convert the former to use the latter to avoid
repetition.
Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Cc: Mathias Nyman <mathias.nyman@intel.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: linux-usb@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
---
drivers/usb/host/xhci.c | 22 ++++++++++------------
1 file changed, 10 insertions(+), 12 deletions(-)
diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c
index 005e65922608..1b5306001340 100644
--- a/drivers/usb/host/xhci.c
+++ b/drivers/usb/host/xhci.c
@@ -9,6 +9,7 @@
*/
#include <linux/pci.h>
+#include <linux/iopoll.h>
#include <linux/irq.h>
#include <linux/log2.h>
#include <linux/module.h>
@@ -52,7 +53,6 @@ static bool td_on_ring(struct xhci_td *td, struct xhci_ring *ring)
return false;
}
-/* TODO: copied from ehci-hcd.c - can this be refactored? */
/*
* xhci_handshake - spin reading hc until handshake completes or fails
* @ptr: address of hc register to be read
@@ -69,18 +69,16 @@ static bool td_on_ring(struct xhci_td *td, struct xhci_ring *ring)
int xhci_handshake(void __iomem *ptr, u32 mask, u32 done, int usec)
{
u32 result;
+ int ret;
- do {
- result = readl(ptr);
- if (result == ~(u32)0) /* card removed */
- return -ENODEV;
- result &= mask;
- if (result == done)
- return 0;
- udelay(1);
- usec--;
- } while (usec > 0);
- return -ETIMEDOUT;
+ ret = readl_poll_timeout(ptr, result,
+ (result & mask) == done ||
+ result == U32_MAX,
+ 1, usec);
+ if (result == U32_MAX) /* card removed */
+ return -ENODEV;
+
+ return ret;
}
/*
--
2.20.1
next reply other threads:[~2019-02-07 0:03 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-02-07 0:03 Andrey Smirnov [this message]
2019-02-07 8:32 ` [PATCH] xhci: Convert xhci_handshake() to use readl_poll_timeout() Mathias Nyman
2019-02-07 8:45 ` Felipe Balbi
2019-02-07 21:03 ` Andrey Smirnov
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