Initial commit for ADAS boards support in 2.23.0

1 files changed, 51 insertions, 0 deletions

diff --git a/meta-rcar-gen3-adas/recipes-kernel/linux/linux-renesas/0029-i2c-mux-pca954x-fix-i2c-mux-selection-caching.patch b/meta-rcar-gen3-adas/recipes-kernel/linux/linux-renesas/0029-i2c-mux-pca954x-fix-i2c-mux-selection-caching.patch
new file mode 100644
index 0000000..1640b51
--- /dev/null
+++ b/meta-rcar-gen3-adas/recipes-kernel/linux/linux-renesas/0029-i2c-mux-pca954x-fix-i2c-mux-selection-caching.patch
@@ -0,0 +1,51 @@
+From 7f638c1cb0a1112dbe0b682a42db30521646686b Mon Sep 17 00:00:00 2001
+From: Russell King <rmk+kernel@armlinux.org.uk>
+Date: Sat, 17 Dec 2016 12:10:56 +0000
+Subject: [PATCH] i2c: mux: pca954x: fix i2c mux selection caching
+
+smbus functions return -ve on error, 0 on success.  However,
+__i2c_transfer() have a different return signature - -ve on error, or
+number of buffers transferred (which may be zero or greater.)
+
+The upshot of this is that the sense of the test is reversed when using
+the mux on a bus supporting the master_xfer method: we cache the value
+and never retry if we fail to transfer any buffers, but if we succeed,
+we clear the cached value.
+
+Fix this by making pca954x_reg_write() return a negative error code for
+all failure cases.
+
+Fixes: 463e8f845cbf ("i2c: mux: pca954x: retry updating the mux selection on failure")
+Acked-by: Peter Rosin <peda@axentia.se>
+Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
+Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
+---
+ drivers/i2c/muxes/i2c-mux-pca954x.c | 5 ++++-
+ 1 file changed, 4 insertions(+), 1 deletion(-)
+
+diff --git a/drivers/i2c/muxes/i2c-mux-pca954x.c b/drivers/i2c/muxes/i2c-mux-pca954x.c
+index 9a348ee..dd18b9c 100644
+--- a/drivers/i2c/muxes/i2c-mux-pca954x.c
++++ b/drivers/i2c/muxes/i2c-mux-pca954x.c
+@@ -167,6 +167,9 @@ static int pca954x_reg_write(struct i2c_adapter *adap,
+ 		buf[0] = val;
+ 		msg.buf = buf;
+ 		ret = __i2c_transfer(adap, &msg, 1);
++
++		if (ret >= 0 && ret != 1)
++			ret = -EREMOTEIO;
+ 	} else {
+ 		union i2c_smbus_data data;
+ 		ret = adap->algo->smbus_xfer(adap, client->addr,
+@@ -195,7 +198,7 @@ static int pca954x_select_chan(struct i2c_mux_core *muxc, u32 chan)
+ 	/* Only select the channel if its different from the last channel */
+ 	if (data->last_chan != regval) {
+ 		ret = pca954x_reg_write(muxc->parent, client, regval);
+-		data->last_chan = ret ? 0 : regval;
++		data->last_chan = ret < 0 ? 0 : regval;
+ 	}
+ 
+ 	return ret;
+-- 
+1.9.1
+