From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jagan Teki Date: Tue, 15 Dec 2015 13:54:21 +0530 Subject: [U-Boot] [PATCH 2/3] sf: Read back and check once spansion quad bit set In-Reply-To: <1450167862-16087-1-git-send-email-jteki@openedev.com> References: <1450167862-16087-1-git-send-email-jteki@openedev.com> Message-ID: <1450167862-16087-2-git-send-email-jteki@openedev.com> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: u-boot@lists.denx.de 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: Mugunthan V N Cc: Simon Glass Cc: Bin Meng Cc: Michal Simek Cc: Siva Durga Prasad Paladugu 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 fc1538c..2e21eaa 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; -- 1.9.1