ath79: add kernel 5.10 support

[openwrt/openwrt.git] / target / linux / ath79 / patches-5.10 / 0054-spi-always-write-cs.patch

diff --git a/target/linux/ath79/patches-5.10/0054-spi-always-write-cs.patch b/target/linux/ath79/patches-5.10/0054-spi-always-write-cs.patch
new file mode 100644 (file)
index 0000000..1e461ce
--- /dev/null
+++ b/target/linux/ath79/patches-5.10/0054-spi-always-write-cs.patch
@@ -0,0 +1,31 @@
+Upstream commit d40f0b6f2e21 ("spi: Avoid settingthe chip select if
+we don't need to") causes the SPI CS only to be asserted once and not
+if it's state stays the same.
+
+This seems to cause problems with the SPI on the AR724x and the AR913x
+(but not the AR71xx). AR934x and subsequent chips do not look affected.
+
+ToDo:
+ - Analyze if this is a hardware bug or a bug in the software.
+ - Send a cleaned up patch upstream.
+
+Signed-off-by: David Bauer <mail@david-bauer.net>
+
+--- a/drivers/spi/spi.c
++++ b/drivers/spi/spi.c
+@@ -791,6 +791,7 @@ static void spi_set_cs(struct spi_device
+ {
+       bool enable1 = enable;
+ 
++#if 0
+       /*
+        * Avoid calling into the driver (or doing delays) if the chip select
+        * isn't actually changing from the last time this was called.
+@@ -801,6 +802,7 @@ static void spi_set_cs(struct spi_device
+ 
+       spi->controller->last_cs_enable = enable;
+       spi->controller->last_cs_mode_high = spi->mode & SPI_CS_HIGH;
++#endif
+ 
+       if (!spi->controller->set_cs_timing) {
+               if (enable1)