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7d7aa2fd92
This change makes the names of Broadcom targets consistent by using the common notation based on SoC/CPU ID (which is used internally anyway), bcmXXXX instead of brcmXXXX. This is even used for target TITLE in make menuconfig already, only the short target name used brcm so far. Despite, since subtargets range from bcm2708 to bcm2711, it seems appropriate to use bcm27xx instead of bcm2708 (again, as already done for BOARDNAME). This also renames the packages brcm2708-userland and brcm2708-gpu-fw. Signed-off-by: Adrian Schmutzler <freifunk@adrianschmutzler.de> Acked-by: Álvaro Fernández Rojas <noltari@gmail.com>
75 lines
2.3 KiB
Diff
75 lines
2.3 KiB
Diff
From 91e443597cdd8f89d2b68ea5bf0f0823d1853ab7 Mon Sep 17 00:00:00 2001
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From: Mariusz Bialonczyk <manio@skyboo.net>
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Date: Mon, 20 May 2019 09:05:56 +0200
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Subject: [PATCH] w1: ds2413: add retry support to state_read()
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commit c50d09a86172073f55ebac0b92ad5a75907d64e7 upstream.
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The state_read() was calling PIO_ACCESS_READ once and bail out if it
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failed for this first time.
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This commit is improving this to trying more times before it give up,
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similarly as the write call is currently doing.
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Signed-off-by: Mariusz Bialonczyk <manio@skyboo.net>
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Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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---
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drivers/w1/slaves/w1_ds2413.c | 37 +++++++++++++++++++++++------------
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1 file changed, 24 insertions(+), 13 deletions(-)
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--- a/drivers/w1/slaves/w1_ds2413.c
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+++ b/drivers/w1/slaves/w1_ds2413.c
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@@ -30,6 +30,9 @@ static ssize_t state_read(struct file *f
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size_t count)
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{
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struct w1_slave *sl = kobj_to_w1_slave(kobj);
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+ unsigned int retries = W1_F3A_RETRIES;
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+ ssize_t bytes_read = -EIO;
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+
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dev_dbg(&sl->dev,
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"Reading %s kobj: %p, off: %0#10x, count: %zu, buff addr: %p",
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bin_attr->attr.name, kobj, (unsigned int)off, count, buf);
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@@ -42,22 +45,30 @@ static ssize_t state_read(struct file *f
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mutex_lock(&sl->master->bus_mutex);
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dev_dbg(&sl->dev, "mutex locked");
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- if (w1_reset_select_slave(sl)) {
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- mutex_unlock(&sl->master->bus_mutex);
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- return -EIO;
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- }
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+ if (w1_reset_select_slave(sl))
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+ goto out;
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- w1_write_8(sl->master, W1_F3A_FUNC_PIO_ACCESS_READ);
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- *buf = w1_read_8(sl->master);
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+ while (retries--) {
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+ w1_write_8(sl->master, W1_F3A_FUNC_PIO_ACCESS_READ);
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- mutex_unlock(&sl->master->bus_mutex);
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- dev_dbg(&sl->dev, "mutex unlocked");
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+ *buf = w1_read_8(sl->master);
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+ /* check for correct complement */
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+ if ((*buf & 0x0F) == ((~*buf >> 4) & 0x0F)) {
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+ bytes_read = 1;
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+ goto out;
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+ }
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+
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+ if (w1_reset_resume_command(sl->master))
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+ goto out; /* unrecoverable error */
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- /* check for correct complement */
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- if ((*buf & 0x0F) != ((~*buf >> 4) & 0x0F))
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- return -EIO;
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- else
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- return 1;
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+ dev_warn(&sl->dev, "PIO_ACCESS_READ error, retries left: %d\n", retries);
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+ }
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+
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+out:
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+ mutex_unlock(&sl->master->bus_mutex);
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+ dev_dbg(&sl->dev, "%s, mutex unlocked, retries: %d\n",
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+ (bytes_read > 0) ? "succeeded" : "error", retries);
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+ return bytes_read;
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}
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static BIN_ATTR_RO(state, 1);
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