diff options
Diffstat (limited to 'target/linux/ath79/patches-5.10/0054-spi-always-write-cs.patch')
| -rw-r--r-- | target/linux/ath79/patches-5.10/0054-spi-always-write-cs.patch | 31 |
1 files changed, 31 insertions, 0 deletions
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 index 0000000000..1e461cee0a --- /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) |