diff options
| author | John Crispin <john@phrozen.org> | 2016-12-25 20:11:34 +0100 |
|---|---|---|
| committer | John Crispin <john@phrozen.org> | 2017-08-05 08:46:36 +0200 |
| commit | 74d00a8c3849c1340efd713eb94b786e304c201f (patch) | |
| tree | de481743de61c34da96ab5f9dba3af3edcfb8260 /target/linux/generic/pending-4.4/861-04_spi_gpio_implement_spi_delay.patch | |
| parent | de350550ef648d9728351b986b0516fa29465c45 (diff) | |
| download | upstream-74d00a8c3849c1340efd713eb94b786e304c201f.tar.gz upstream-74d00a8c3849c1340efd713eb94b786e304c201f.tar.bz2 upstream-74d00a8c3849c1340efd713eb94b786e304c201f.zip | |
kernel: split patches folder up into backport, pending and hack folders
* properly format/comment all patches
* merge debloat patches
* merge Kconfig patches
* merge swconfig patches
* merge hotplug patches
* drop 200-fix_localversion.patch - upstream
* drop 222-arm_zimage_none.patch - unused
* drop 252-mv_cesa_depends.patch - no longer required
* drop 410-mtd-move-forward-declaration-of-struct-mtd_info.patch - unused
* drop 661-fq_codel_keep_dropped_stats.patch - outdated
* drop 702-phy_add_aneg_done_function.patch - upstream
* drop 840-rtc7301.patch - unused
* drop 841-rtc_pt7c4338.patch - upstream
* drop 921-use_preinit_as_init.patch - unused
* drop spio-gpio-old and gpio-mmc - unused
Signed-off-by: John Crispin <john@phrozen.org>
Diffstat (limited to 'target/linux/generic/pending-4.4/861-04_spi_gpio_implement_spi_delay.patch')
| -rw-r--r-- | target/linux/generic/pending-4.4/861-04_spi_gpio_implement_spi_delay.patch | 58 |
1 files changed, 58 insertions, 0 deletions
diff --git a/target/linux/generic/pending-4.4/861-04_spi_gpio_implement_spi_delay.patch b/target/linux/generic/pending-4.4/861-04_spi_gpio_implement_spi_delay.patch new file mode 100644 index 0000000000..fc1b40c035 --- /dev/null +++ b/target/linux/generic/pending-4.4/861-04_spi_gpio_implement_spi_delay.patch @@ -0,0 +1,58 @@ +Implement the SPI-GPIO delay function for busses that need speed limitation. + +--mb + + + +--- a/drivers/spi/spi-gpio.c ++++ b/drivers/spi/spi-gpio.c +@@ -17,6 +17,7 @@ + #include <linux/module.h> + #include <linux/platform_device.h> + #include <linux/gpio.h> ++#include <linux/delay.h> + #include <linux/of.h> + #include <linux/of_device.h> + #include <linux/of_gpio.h> +@@ -69,6 +70,7 @@ struct spi_gpio { + * #define SPI_MOSI_GPIO 120 + * #define SPI_SCK_GPIO 121 + * #define SPI_N_CHIPSEL 4 ++ * #undef NEED_SPIDELAY + * #include "spi-gpio.c" + */ + +@@ -76,6 +78,7 @@ struct spi_gpio { + #define DRIVER_NAME "spi_gpio" + + #define GENERIC_BITBANG /* vs tight inlines */ ++#define NEED_SPIDELAY 1 + + /* all functions referencing these symbols must define pdata */ + #define SPI_MISO_GPIO ((pdata)->miso) +@@ -126,12 +129,20 @@ static inline int getmiso(const struct s + #undef pdata + + /* +- * NOTE: this clocks "as fast as we can". It "should" be a function of the +- * requested device clock. Software overhead means we usually have trouble +- * reaching even one Mbit/sec (except when we can inline bitops), so for now +- * we'll just assume we never need additional per-bit slowdowns. ++ * NOTE: to clock "as fast as we can", set spi_device.max_speed_hz ++ * and spi_transfer.speed_hz to 0. ++ * Otherwise this is a function of the requested device clock. ++ * Software overhead means we usually have trouble ++ * reaching even one Mbit/sec (except when we can inline bitops). So on small ++ * embedded devices with fast SPI slaves you usually don't need a delay. + */ +-#define spidelay(nsecs) do {} while (0) ++static inline void spidelay(unsigned nsecs) ++{ ++#ifdef NEED_SPIDELAY ++ if (unlikely(nsecs)) ++ ndelay(nsecs); ++#endif /* NEED_SPIDELAY */ ++} + + #include "spi-bitbang-txrx.h" + |