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authorManuel Lauss <mano@roarinelk.homelinux.net>2008-07-29 10:10:49 +0200
committerPierre Ossman <drzeus@drzeus.cx>2008-08-01 19:04:26 +0200
commite491d230fd398bb730e3c2dd734c5447463b9d38 (patch)
tree84017cd3fe7bddb473977e9d4cf27539bdf7a90f /drivers/mmc
parentb41e9c7b8e14ea57aa0fc05fd63a0de0e935d58d (diff)
downloadop-kernel-dev-e491d230fd398bb730e3c2dd734c5447463b9d38.zip
op-kernel-dev-e491d230fd398bb730e3c2dd734c5447463b9d38.tar.gz
au1xmmc: raise segment size limit.
Raise the DMA block size limit from 2048 bytes to the maximum supported by the DMA controllers on the chip (64KB on Au1100, 4MB on Au1200). This gives a very 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@roarinelk.homelinux.net> Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
Diffstat (limited to 'drivers/mmc')
-rw-r--r--drivers/mmc/host/au1xmmc.c8
1 files changed, 7 insertions, 1 deletions
diff --git a/drivers/mmc/host/au1xmmc.c b/drivers/mmc/host/au1xmmc.c
index 99b2091..d3f5561 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 */
+#ifdef CONFIG_SOC_AU1100
+#define AU1XMMC_DESCRIPTOR_SIZE 0x0000ffff
+#else /* Au1200 */
+#define AU1XMMC_DESCRIPTOR_SIZE 0x003fffff
+#endif
#define AU1XMMC_OCR (MMC_VDD_27_28 | MMC_VDD_28_29 | MMC_VDD_29_30 | \
MMC_VDD_30_31 | MMC_VDD_31_32 | MMC_VDD_32_33 | \
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