Hi Shashidhar (resending in form that won't get bounced from linux-mmc list). On 08/02/2011 12:53 PM, Shashidhar Hiremath wrote: > Hi James, > Sorry for interrupting you, > > I had a few queries on mmc driver. Can you please help on this I've CC'd the linux-mmc list as both questions involve mostly generic MMC. > 1> > ------------------------------------------------------------------------------ > What do the following elements in the mmc_host struct signify: > max_segs,max_block_size,max_block_count,max_seg_size,max_req_size I'm not familiar with these myself, but as far as I can tell they signify the limits of the DMAC (which is why they're set differently depending on whether the internal DMAC or the platform specific DMAC is used): http://lxr.linux.no/#linux+v3.0/drivers/mmc/host/dw_mmc.c#L1421 > I was adding the support for Dual_Buffer Descriptors support in dw_mmc > driver.Does it require a change in the above elements of mmc_host > structure ? I don't know, but I'll see if I can find out. > ------------------------------------------------------------------------------ > > 2> > ------------------------------------------------------------------------------ > I have observed in most of the drivers that the switching between PIO > mode and the DMA mode is being done based on the data_size. Instead can > this be made independent of data_size and be coded such that ,it only > depends on the menu-config option and driver uses only one ? I can see the use of that (I've forced PIO mode myself during debugging or running mmc_test), but whether this is an acceptable thing to have upstream as a config option I don't know. Regards James -- 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
