Hi Sergei, > Manuel Lauss wrote: >> Please apply this patch, as it fixes an oops when MMC-DMA and network >> traffic are active at the same time. This seems to be a 2.6.27-only >> thing; >> the current au1xmmc code (minus the polling parts) works fine on 2.6.26. >> >> --- >> >> Raise the DMA block size limit from 2048 bytes to the maximum supported >> by the DMA controllers on the chip (128kB on Au1100, 4MB on Au1200). >> >> This gives a small performance boost and apparently fixes an oops when >> MMC-DMA and network traffic are active at the same time. >> >> Signed-off-by: Manuel Lauss <mano@xxxxxxxxxxxxxxxxxxxxxxx> >> >> > [...] >> diff --git a/drivers/mmc/host/au1xmmc.c b/drivers/mmc/host/au1xmmc.c >> index 99b2091..dd414f1 100644 >> --- a/drivers/mmc/host/au1xmmc.c >> +++ b/drivers/mmc/host/au1xmmc.c >> @@ -61,7 +61,13 @@ >> /* Hardware definitions */ >> #define AU1XMMC_DESCRIPTOR_COUNT 1 >> -#define AU1XMMC_DESCRIPTOR_SIZE 2048 >> + >> +/* max DMA seg size: 64kB on Au1100, 4MB on Au1200 */ >> > > So, it's 64 or 128 KB? KB since k prefix usualy means decimal kilo... :-) I'm not so sure myself. If I understand the datasheet correctly, the Au1100 DMA ctrl always transfers 2 segments of up to 64KB each. I'll correct the commit-text and resend. Someone else with Au1100 hardware can figure that out if they want; for now this only matter for Au1200 DMA. (And I refuse to acknowledge the existence of that 'kibibyte' crap ;-) ) > WBR, Sergei Thank you Sergei, Manuel Lauss
