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d6c831e0e5
This flag was added to 4.9 with upstream commit 76a4707de5e18dc32d9cb4e990686140c5664a15. Signed-off-by: Victor Shyba <victor1984@riseup.net> [refresh and adjust platform patches, fix commit message] Signed-off-by: Mathias Kresin <dev@kresin.me>
67 lines
2.1 KiB
Diff
67 lines
2.1 KiB
Diff
From 3a06c61b48fbc23046928275e37a693e1055ae74 Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?Ezequiel=20Garc=C3=ADa?= <ezequiel@vanguardiasur.com.ar>
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Date: Mon, 28 Dec 2015 17:54:51 -0300
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Subject: [PATCH 086/113] mtd: spi-nor: wait until lock/unlock operations are
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ready
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On Micron and Numonyx devices, the status register write command
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(WRSR), raises a work-in-progress bit (WIP) on the status register.
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The datasheets for these devices specify that while the status
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register write is in progress, the status register WIP bit can still
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be read to check the end of the operation.
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This commit adds a wait_till_ready call on lock/unlock operations,
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which is required for Micron and Numonyx but should be harmless for
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others. This is needed to prevent applications from issuing erase or
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program operations before the unlock operation is completed.
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Reported-by: Stas Sergeev <stsp@list.ru>
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Signed-off-by: Ezequiel Garcia <ezequiel@vanguardiasur.com.ar>
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Signed-off-by: Brian Norris <computersforpeace@gmail.com>
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---
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drivers/mtd/spi-nor/spi-nor.c | 12 ++++++++++--
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1 file changed, 10 insertions(+), 2 deletions(-)
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--- a/drivers/mtd/spi-nor/spi-nor.c
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+++ b/drivers/mtd/spi-nor/spi-nor.c
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@@ -482,6 +482,7 @@ static int stm_lock(struct spi_nor *nor,
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int status_old, status_new;
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u8 mask = SR_BP2 | SR_BP1 | SR_BP0;
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u8 shift = ffs(mask) - 1, pow, val;
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+ int ret;
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status_old = read_sr(nor);
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if (status_old < 0)
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@@ -520,7 +521,10 @@ static int stm_lock(struct spi_nor *nor,
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return -EINVAL;
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write_enable(nor);
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- return write_sr(nor, status_new);
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+ ret = write_sr(nor, status_new);
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+ if (ret)
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+ return ret;
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+ return spi_nor_wait_till_ready(nor);
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}
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/*
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@@ -534,6 +538,7 @@ static int stm_unlock(struct spi_nor *no
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int status_old, status_new;
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u8 mask = SR_BP2 | SR_BP1 | SR_BP0;
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u8 shift = ffs(mask) - 1, pow, val;
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+ int ret;
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status_old = read_sr(nor);
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if (status_old < 0)
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@@ -570,7 +575,10 @@ static int stm_unlock(struct spi_nor *no
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return -EINVAL;
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write_enable(nor);
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- return write_sr(nor, status_new);
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+ ret = write_sr(nor, status_new);
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+ if (ret)
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+ return ret;
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+ return spi_nor_wait_till_ready(nor);
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}
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/*
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