diff options
Diffstat (limited to 'target/linux/generic/patches-2.6.33/920-04-spi-gpio-implement-spi-delay.patch')
| -rw-r--r-- | target/linux/generic/patches-2.6.33/920-04-spi-gpio-implement-spi-delay.patch | 58 |
1 files changed, 0 insertions, 58 deletions
diff --git a/target/linux/generic/patches-2.6.33/920-04-spi-gpio-implement-spi-delay.patch b/target/linux/generic/patches-2.6.33/920-04-spi-gpio-implement-spi-delay.patch deleted file mode 100644 index 19032881b8..0000000000 --- a/target/linux/generic/patches-2.6.33/920-04-spi-gpio-implement-spi-delay.patch +++ /dev/null @@ -1,58 +0,0 @@ -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 -@@ -21,6 +21,7 @@ - #include <linux/init.h> - #include <linux/platform_device.h> - #include <linux/gpio.h> -+#include <linux/delay.h> - - #include <linux/spi/spi.h> - #include <linux/spi/spi_bitbang.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) -@@ -120,12 +123,20 @@ 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 */ -+} - - #define EXPAND_BITBANG_TXRX - #include <linux/spi/spi_bitbang.h> |