diff options
Diffstat (limited to 'target/linux/brcm63xx/patches-4.4/000-4.5-20-spi-expose-master-transfer-size-limitation.patch')
| -rw-r--r-- | target/linux/brcm63xx/patches-4.4/000-4.5-20-spi-expose-master-transfer-size-limitation.patch | 51 |
1 files changed, 0 insertions, 51 deletions
diff --git a/target/linux/brcm63xx/patches-4.4/000-4.5-20-spi-expose-master-transfer-size-limitation.patch b/target/linux/brcm63xx/patches-4.4/000-4.5-20-spi-expose-master-transfer-size-limitation.patch deleted file mode 100644 index 21e037ce77..0000000000 --- a/target/linux/brcm63xx/patches-4.4/000-4.5-20-spi-expose-master-transfer-size-limitation.patch +++ /dev/null @@ -1,51 +0,0 @@ -From 4acad4aae10d1fa79a075b38b5c73772c44f576c Mon Sep 17 00:00:00 2001 -From: Michal Suchanek <hramrach@gmail.com> -Date: Wed, 2 Dec 2015 10:38:21 +0000 -Subject: [PATCH] spi: expose master transfer size limitation. - -On some SPI controllers it is not feasible to transfer arbitrary amount -of data at once. - -When the limit on transfer size is a few kilobytes at least it makes -sense to use the SPI hardware rather than reverting to gpio driver. - -The protocol drivers need a way to check that they do not sent overly -long messages, though. - -Signed-off-by: Michal Suchanek <hramrach@gmail.com> -Signed-off-by: Mark Brown <broonie@kernel.org> ---- - include/linux/spi/spi.h | 15 +++++++++++++++ - 1 file changed, 15 insertions(+) - ---- a/include/linux/spi/spi.h -+++ b/include/linux/spi/spi.h -@@ -428,6 +428,12 @@ struct spi_master { - #define SPI_MASTER_MUST_RX BIT(3) /* requires rx */ - #define SPI_MASTER_MUST_TX BIT(4) /* requires tx */ - -+ /* -+ * on some hardware transfer size may be constrained -+ * the limit may depend on device transfer settings -+ */ -+ size_t (*max_transfer_size)(struct spi_device *spi); -+ - /* lock and mutex for SPI bus locking */ - spinlock_t bus_lock_spinlock; - struct mutex bus_lock_mutex; -@@ -837,6 +843,15 @@ extern int spi_async(struct spi_device * - extern int spi_async_locked(struct spi_device *spi, - struct spi_message *message); - -+static inline size_t -+spi_max_transfer_size(struct spi_device *spi) -+{ -+ struct spi_master *master = spi->master; -+ if (!master->max_transfer_size) -+ return SIZE_MAX; -+ return master->max_transfer_size(spi); -+} -+ - /*---------------------------------------------------------------------------*/ - - /* All these synchronous SPI transfer routines are utilities layered |