diff options
| author | Nicolas Pitre <nico@cam.org> | 2006-05-05 22:32:24 +0100 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2006-05-05 22:32:24 +0100 |
| commit | 99532559dc7a8e686b2cef14c780a7ad5dbd4a31 (patch) | |
| tree | 3dff94d714f3e32739cd898b7eebf7910e1ef227 /arch | |
| parent | b7d7ef87e15dea105be59ec8f14e2f92182dd421 (diff) | |
| download | lwn-99532559dc7a8e686b2cef14c780a7ad5dbd4a31.tar.gz lwn-99532559dc7a8e686b2cef14c780a7ad5dbd4a31.zip | |
[ARM] 3500/1: fix PXA27x DMA allocation priority
Patch from Nicolas Pitre
Intel PXA27x developers manual section 5.4.1.1 lists a priority
distribution for the DMA channels differently than what the code
currently assumes. This patch fixes that.
Noticed by Simon Vogl <vogl@soft.uni-linz.ac.at>
Signed-off-by: Nicolas Pitre <nico@cam.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm/mach-pxa/dma.c | 17 |
1 files changed, 5 insertions, 12 deletions
diff --git a/arch/arm/mach-pxa/dma.c b/arch/arm/mach-pxa/dma.c index 458112b21e25..7d8c85486c66 100644 --- a/arch/arm/mach-pxa/dma.c +++ b/arch/arm/mach-pxa/dma.c @@ -45,23 +45,16 @@ int pxa_request_dma (char *name, pxa_dma_prio prio, local_irq_save(flags); - /* try grabbing a DMA channel with the requested priority */ - for (i = prio; i < prio + PXA_DMA_NBCH(prio); i++) { - if (!dma_channels[i].name) { - found = 1; - break; - } - } - - if (!found) { - /* requested prio group is full, try hier priorities */ - for (i = prio-1; i >= 0; i--) { + do { + /* try grabbing a DMA channel with the requested priority */ + pxa_for_each_dma_prio (i, prio) { if (!dma_channels[i].name) { found = 1; break; } } - } + /* if requested prio group is full, try a hier priority */ + } while (!found && prio--); if (found) { DCSR(i) = DCSR_STARTINTR|DCSR_ENDINTR|DCSR_BUSERR; |