diff options
Diffstat (limited to 'target/linux/brcm2708/patches-4.19/950-0678-w1-ds2413-when-the-slave-is-not-responding-during-re.patch')
| -rw-r--r-- | target/linux/brcm2708/patches-4.19/950-0678-w1-ds2413-when-the-slave-is-not-responding-during-re.patch | 56 |
1 files changed, 0 insertions, 56 deletions
diff --git a/target/linux/brcm2708/patches-4.19/950-0678-w1-ds2413-when-the-slave-is-not-responding-during-re.patch b/target/linux/brcm2708/patches-4.19/950-0678-w1-ds2413-when-the-slave-is-not-responding-during-re.patch deleted file mode 100644 index c3b0c5d308..0000000000 --- a/target/linux/brcm2708/patches-4.19/950-0678-w1-ds2413-when-the-slave-is-not-responding-during-re.patch +++ /dev/null @@ -1,56 +0,0 @@ -From 1808665b2b2e06d6f14762eb0ab82d65e3af3e2b Mon Sep 17 00:00:00 2001 -From: Mariusz Bialonczyk <manio@skyboo.net> -Date: Wed, 22 May 2019 12:40:53 +0200 -Subject: [PATCH 678/703] w1: ds2413: when the slave is not responding during - read, select it again - -commit 3856032a0628e6b94badb9131a706dda185e071d upstream. - -The protocol is not allowing to obtain a byte of 0xff for PIO_ACCESS_READ -call. It is very likely that the slave was not addressed properly and -it is just not respoding (leaving the bus in logic high state) during -the read of sampled PIO value. -We cannot just call w1_reset_resume_command() because the problem will -persist, instead try selecting (addressing) the slave again. - -Signed-off-by: Mariusz Bialonczyk <manio@skyboo.net> -Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> ---- - drivers/w1/slaves/w1_ds2413.c | 9 ++++++++- - 1 file changed, 8 insertions(+), 1 deletion(-) - ---- a/drivers/w1/slaves/w1_ds2413.c -+++ b/drivers/w1/slaves/w1_ds2413.c -@@ -24,6 +24,7 @@ - #define W1_F3A_FUNC_PIO_ACCESS_READ 0xF5 - #define W1_F3A_FUNC_PIO_ACCESS_WRITE 0x5A - #define W1_F3A_SUCCESS_CONFIRM_BYTE 0xAA -+#define W1_F3A_INVALID_PIO_STATE 0xFF - - static ssize_t state_read(struct file *filp, struct kobject *kobj, - struct bin_attribute *bin_attr, char *buf, loff_t off, -@@ -45,6 +46,7 @@ static ssize_t state_read(struct file *f - mutex_lock(&sl->master->bus_mutex); - dev_dbg(&sl->dev, "mutex locked"); - -+next: - if (w1_reset_select_slave(sl)) - goto out; - -@@ -52,10 +54,15 @@ static ssize_t state_read(struct file *f - w1_write_8(sl->master, W1_F3A_FUNC_PIO_ACCESS_READ); - - *buf = w1_read_8(sl->master); -- /* check for correct complement */ - if ((*buf & 0x0F) == ((~*buf >> 4) & 0x0F)) { -+ /* complement is correct */ - bytes_read = 1; - goto out; -+ } else if (*buf == W1_F3A_INVALID_PIO_STATE) { -+ /* slave didn't respond, try to select it again */ -+ dev_warn(&sl->dev, "slave device did not respond to PIO_ACCESS_READ, " \ -+ "reselecting, retries left: %d\n", retries); -+ goto next; - } - - if (w1_reset_resume_command(sl->master)) |