From 3f891a103c5c90c186a5a0b1584dfa39e8688b8f Mon Sep 17 00:00:00 2001 From: Vignesh Raghavendra Date: Thu, 17 Sep 2020 16:53:08 +0530 Subject: [PATCH] mtd: cfi_mtd: Use DMA for reads When possible use DMA for reading from CFI flash, this provides upto 5x improvement in read performance with high speed CFI compliant flashes like HyperFlash. Code will gracefully fallback to CPU copy when DMA is unavailable. Signed-off-by: Vignesh Raghavendra Reviewed-by: Stefan Roese --- drivers/mtd/cfi_mtd.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/mtd/cfi_mtd.c b/drivers/mtd/cfi_mtd.c index a5bb096..78293ca 100644 --- a/drivers/mtd/cfi_mtd.c +++ b/drivers/mtd/cfi_mtd.c @@ -6,6 +6,7 @@ */ #include +#include #include #include @@ -70,7 +71,8 @@ static int cfi_mtd_read(struct mtd_info *mtd, loff_t from, size_t len, flash_info_t *fi = mtd->priv; u_char *f = (u_char*)(fi->start[0]) + from; - memcpy(buf, f, len); + if (dma_memcpy(buf, f, len) < 0) + memcpy(buf, f, len); *retlen = len; return 0; -- 2.7.4