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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 <vigneshr@ti.com>
Reviewed-by: Stefan Roese <sr@denx.de>
This commit is contained in:
Vignesh Raghavendra 2020-09-17 16:53:08 +05:30 committed by Stefan Roese
parent 8995a86cd6
commit 3f891a103c
1 changed files with 3 additions and 1 deletions
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4
drivers/mtd/cfi_mtd.c
View File

@ -6,6 +6,7 @@
*/
#include <common.h>
#include <dma.h>
#include <flash.h>
#include <malloc.h>
@ -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;