From ffecb0fc840707d7aadf42364ae596f998a3d52f Mon Sep 17 00:00:00 2001 From: Jagan Teki Date: Tue, 15 Dec 2015 12:28:39 +0530 Subject: sf: Read back and check once spansion quad bit set One spansion quad bit set using CR, it's good to read back and check the written bit and also if it's already been set check for the bit and return. Cc: Vignesh R Cc: Simon Glass Cc: Bin Meng Cc: Michal Simek Cc: Siva Durga Prasad Paladugu Tested-by: Mugunthan V N Signed-off-by: Jagan Teki --- drivers/mtd/spi/spi_flash.c | 18 ++++++++++++------ 1 file changed, 12 insertions(+), 6 deletions(-) diff --git a/drivers/mtd/spi/spi_flash.c b/drivers/mtd/spi/spi_flash.c index d9124c5..b7c0da4 100644 --- a/drivers/mtd/spi/spi_flash.c +++ b/drivers/mtd/spi/spi_flash.c @@ -862,12 +862,18 @@ static int spansion_quad_enable(struct spi_flash *flash) if (ret < 0) return ret; - if (qeb_status & STATUS_QEB_WINSPAN) { - debug("SF: winspan: QEB is already set\n"); - } else { - ret = write_cr(flash, STATUS_QEB_WINSPAN); - if (ret < 0) - return ret; + if (qeb_status & STATUS_QEB_WINSPAN) + return 0; + + ret = write_cr(flash, STATUS_QEB_WINSPAN); + if (ret < 0) + return ret; + + /* read CR and check it */ + ret = read_cr(flash, &qeb_status); + if (!(ret >= 0 && (qeb_status & STATUS_QEB_WINSPAN))) { + printf("SF: Spansion CR Quad bit not clear\n"); + return -EINVAL; } return ret; -- cgit v1.1