diff options
Diffstat (limited to 'recipes-kernel/linux/linux-3.12.27/linux-3.12-atmel-spi.patch')
| -rw-r--r-- | recipes-kernel/linux/linux-3.12.27/linux-3.12-atmel-spi.patch | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/recipes-kernel/linux/linux-3.12.27/linux-3.12-atmel-spi.patch b/recipes-kernel/linux/linux-3.12.27/linux-3.12-atmel-spi.patch new file mode 100644 index 0000000..898bf74 --- /dev/null +++ b/recipes-kernel/linux/linux-3.12.27/linux-3.12-atmel-spi.patch @@ -0,0 +1,37 @@ +Index: linux-3.12.13/drivers/spi/spi-atmel.c +=================================================================== +--- linux-3.12.13.orig/drivers/spi/spi-atmel.c 2014-04-04 15:00:11.677055454 -0500 ++++ linux-3.12.13/drivers/spi/spi-atmel.c 2014-04-04 15:36:28.973123089 -0500 +@@ -291,26 +291,15 @@ + unsigned active = spi->mode & SPI_CS_HIGH; + u32 mr; + ++ mr = spi_readl(as, MR); + if (atmel_spi_is_v2(as)) { +- spi_writel(as, CSR0 + 4 * spi->chip_select, asd->csr); +- /* For the low SPI version, there is a issue that PDC transfer +- * on CS1,2,3 needs SPI_CSR0.BITS config as SPI_CSR1,2,3.BITS ++ /* mtcdt: always use CSR0 ++ * old 2.6.39 kernel did this and it worked for supporting more than 4 slaves + */ + spi_writel(as, CSR0, asd->csr); +- if (as->caps.has_wdrbt) { +- spi_writel(as, MR, +- SPI_BF(PCS, ~(0x01 << spi->chip_select)) +- | SPI_BIT(WDRBT) +- | SPI_BIT(MODFDIS) +- | SPI_BIT(MSTR)); +- } else { +- spi_writel(as, MR, +- SPI_BF(PCS, ~(0x01 << spi->chip_select)) +- | SPI_BIT(MODFDIS) +- | SPI_BIT(MSTR)); +- } +- +- mr = spi_readl(as, MR); ++ mr &= (SPI_BIT(MODFDIS) | SPI_BIT(MSTR) | (as->caps.has_wdrbt ? SPI_BIT(WDRBT) : 0)); ++ mr |= SPI_BF(PCS, 0x0e); ++ spi_writel(as, MR, mr); + gpio_set_value(asd->npcs_pin, active); + } else { + u32 cpol = (spi->mode & SPI_CPOL) ? SPI_BIT(CPOL) : 0; |