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Diffstat (limited to 'target/linux/brcm2708/patches-4.19/950-0588-w1-ds2413-output_write-cosmetic-fixes-simplify.patch')
-rw-r--r--target/linux/brcm2708/patches-4.19/950-0588-w1-ds2413-output_write-cosmetic-fixes-simplify.patch64
1 files changed, 64 insertions, 0 deletions
diff --git a/target/linux/brcm2708/patches-4.19/950-0588-w1-ds2413-output_write-cosmetic-fixes-simplify.patch b/target/linux/brcm2708/patches-4.19/950-0588-w1-ds2413-output_write-cosmetic-fixes-simplify.patch
new file mode 100644
index 0000000000..6c0a304f1c
--- /dev/null
+++ b/target/linux/brcm2708/patches-4.19/950-0588-w1-ds2413-output_write-cosmetic-fixes-simplify.patch
@@ -0,0 +1,64 @@
+From 3280ce5f5483a351f49e84b48ad98df87989346a Mon Sep 17 00:00:00 2001
+From: Mariusz Bialonczyk <manio@skyboo.net>
+Date: Mon, 20 May 2019 09:05:55 +0200
+Subject: [PATCH] w1: ds2413: output_write() cosmetic fixes / simplify
+
+commit ae2ee27aa985232f66421d7cd1c7f4b87c7dba7d upstream.
+
+Make the output_write simpler.
+Based on Jean-Francois Dagenais code from:
+49695ac46861 ("w1: ds2408: reset on output_write retry with readback")
+
+Signed-off-by: Mariusz Bialonczyk <manio@skyboo.net>
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+---
+ drivers/w1/slaves/w1_ds2413.c | 19 +++++++++++--------
+ 1 file changed, 11 insertions(+), 8 deletions(-)
+
+--- a/drivers/w1/slaves/w1_ds2413.c
++++ b/drivers/w1/slaves/w1_ds2413.c
+@@ -69,6 +69,7 @@ static ssize_t output_write(struct file
+ struct w1_slave *sl = kobj_to_w1_slave(kobj);
+ u8 w1_buf[3];
+ unsigned int retries = W1_F3A_RETRIES;
++ ssize_t bytes_written = -EIO;
+
+ if (count != 1 || off != 0)
+ return -EFAULT;
+@@ -78,7 +79,7 @@ static ssize_t output_write(struct file
+ dev_dbg(&sl->dev, "mutex locked");
+
+ if (w1_reset_select_slave(sl))
+- goto error;
++ goto out;
+
+ /* according to the DS2413 datasheet the most significant 6 bits
+ should be set to "1"s, so do it now */
+@@ -91,18 +92,20 @@ static ssize_t output_write(struct file
+ w1_write_block(sl->master, w1_buf, 3);
+
+ if (w1_read_8(sl->master) == W1_F3A_SUCCESS_CONFIRM_BYTE) {
+- mutex_unlock(&sl->master->bus_mutex);
+- dev_dbg(&sl->dev, "mutex unlocked, retries:%d", retries);
+- return 1;
++ bytes_written = 1;
++ goto out;
+ }
+ if (w1_reset_resume_command(sl->master))
+- goto error;
++ goto out; /* unrecoverable error */
++
++ dev_warn(&sl->dev, "PIO_ACCESS_WRITE error, retries left: %d\n", retries);
+ }
+
+-error:
++out:
+ mutex_unlock(&sl->master->bus_mutex);
+- dev_dbg(&sl->dev, "mutex unlocked in error, retries:%d", retries);
+- return -EIO;
++ dev_dbg(&sl->dev, "%s, mutex unlocked, retries: %d\n",
++ (bytes_written > 0) ? "succeeded" : "error", retries);
++ return bytes_written;
+ }
+
+ static BIN_ATTR(output, S_IRUGO | S_IWUSR | S_IWGRP, NULL, output_write, 1);