On Wed, Jul 18, 2012 at 10:36 AM, Shilimkar, Santosh <santosh.shilimkar@xxxxxx> wrote: > On Wed, Jul 18, 2012 at 1:14 PM, S, Venkatraman <svenkatr@xxxxxx> wrote: >> On Wed, Jul 18, 2012 at 12:40 PM, Tony Lindgren <tony@xxxxxxxxxxx> wrote: >>> * Shilimkar, Santosh <santosh.shilimkar@xxxxxx> [120718 00:09]: >>>> On Wed, Jul 18, 2012 at 12:29 PM, Tony Lindgren <tony@xxxxxxxxxxx> wrote: >>>> > * Javier Martinez Canillas <javier@xxxxxxxxxxxx> [120716 23:56]: >>>> >> On Tue, Jul 17, 2012 at 8:45 AM, Shilimkar, Santosh >>>> >> <santosh.shilimkar@xxxxxx> wrote: >>>> >> > Hi, >>>> >> > >>>> >> > On Tue, Jul 17, 2012 at 6:00 AM, Javier Martinez Canillas >>>> >> > <javier@xxxxxxxxxxxx> wrote: >>>> >> >> The OMAP MMC and OMAP High Speed MMC hosts now use entirely the DMA >>>> >> >> engine API instead of the previous private DMA API implementation. >>>> >> >> >>>> >> >> So, if the kernel is built with support for any of these hosts but it >>>> >> >> doesn't support DMA devices nor OMAP DMA support, it fails when trying >>>> >> >> to obtain a DMA channel which leads to the following error on an OMAP3 >>>> >> >> IGEPv2 Rev.C board (and probably on most OMAP boards with MMC support): >>>> >> >> >>>> >> >> [ 2.199981] omap_hsmmc omap_hsmmc.1: unable to obtain RX DMA engine channel 48 >>>> >> >> [ 2.215087] omap_hsmmc omap_hsmmc.0: unable to obtain RX DMA engine channel 62 >>>> >> >> >>>> >> >> selecting automatically CONFIG_DMADEVICES and CONFIG_DMA_OMAP solves it. >>>> >> >> >>>> >> >> Signed-off-by: Javier Martinez Canillas <javier@xxxxxxxxxxxx> >>>> >> >> --- >>>> >> > Considering, we are updating drivers to select the DMA engine, can you >>>> >> > also include >>>> >> > "drivers/spi/spi-omap2-mcspi.c" which is also updated for DMA engine. >>>> >> > >>>> >> > Regards >>>> >> > Santosh >>>> >> >>>> >> Hi Santosh, >>>> >> >>>> >> Ok, I'll send a v2 now which includes spi-omap2-mcspi then. >>>> > >>>> > I don't think we should do this, the drivers should work with and without >>>> > dma. This just needs to be added to the omap2plus_defconfig. >>>> > >>>> Well this was not decided based on any DMA CONFIG option before for >>>> the subject drivers. It is already by default enabled if the DMA is supported >>>> by the driver IP. There is a possibility to disable it from driver platform/dt >>>> data so that still remains. >>> >>> I think it should rather be that if the driver is broken and does not work >>> without DMA, it should have depends on CONFIG_DMA_OMAP. >>> >> I can confirm that omap MMC can't work without DMA; polled mode is not >> supported / implemented. > > Same case for SPI driver as well. It uses DMA for everything except the cases > where DMA doesn't make sense like 1 byte/2 byte etc. And its not configurable, > > At least considering this, it is better we do this per driver than enabling > it at SOC config. > > Regards > Santosh > -- Hi Santosh, And what about enabling it at the SoC config level but making the drivers dependant on CONFIG_DMADEVICES and CONFIG_DMA_OMAP? If you agree I can send something like this in two different patches (one for the omap2plus_defconfig and another to make the drivers dependant on the config option): diff --git a/arch/arm/configs/omap2plus_defconfig b/arch/arm/configs/omap2plus_defconfig index b152de7..e58edc3 100644 --- a/arch/arm/configs/omap2plus_defconfig +++ b/arch/arm/configs/omap2plus_defconfig @@ -193,6 +193,8 @@ CONFIG_MMC_OMAP_HS=y CONFIG_RTC_CLASS=y CONFIG_RTC_DRV_TWL92330=y CONFIG_RTC_DRV_TWL4030=y +CONFIG_DMADEVICES=y +CONFIG_DMA_OMAP=y CONFIG_EXT2_FS=y CONFIG_EXT3_FS=y # CONFIG_EXT3_FS_XATTR is not set diff --git a/drivers/mmc/host/Kconfig b/drivers/mmc/host/Kconfig index aa131b3..314c7bd 100644 --- a/drivers/mmc/host/Kconfig +++ b/drivers/mmc/host/Kconfig @@ -231,7 +231,7 @@ config MMC_SDHCI_S3C_DMA config MMC_OMAP tristate "TI OMAP Multimedia Card Interface support" - depends on ARCH_OMAP + depends on ARCH_OMAP && DMADEVICES && DMA_OMAP select TPS65010 if MACH_OMAP_H2 help This selects the TI OMAP Multimedia card Interface. @@ -242,7 +242,8 @@ config MMC_OMAP config MMC_OMAP_HS tristate "TI OMAP High Speed Multimedia Card Interface support" - depends on SOC_OMAP2430 || ARCH_OMAP3 || ARCH_OMAP4 + depends on (SOC_OMAP2430 || ARCH_OMAP3 || ARCH_OMAP4) && \ + DMADEVICES && DMA_OMAP help This selects the TI OMAP High Speed Multimedia card Interface. If you have an OMAP2430 or OMAP3 board or OMAP4 board with a diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig index cd2fe35..1c23242 100644 --- a/drivers/spi/Kconfig +++ b/drivers/spi/Kconfig @@ -237,7 +237,7 @@ config SPI_OMAP_UWIRE config SPI_OMAP24XX tristate "McSPI driver for OMAP" - depends on ARCH_OMAP2PLUS + depends on ARCH_OMAP2PLUS && DMADEVICES && DMA_OMAP help SPI master controller for OMAP24XX and later Multichannel SPI (McSPI) modules. Best regards, Javier -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
