[PATCH v2 23/53] mtd: nand: denali: set DEVICES_CONNECTED 1 if not set

From	Masahiro Yamada <yamada.masahiro@socionext.com>
Newsgroups	linux.kernel
Subject	[PATCH v2 23/53] mtd: nand: denali: set DEVICES_CONNECTED 1 if not set
Date	2017-03-22 15:20 +0100
Message-ID	<tnPhh-3Fu-55@gated-at.bofh.it> (permalink)
References	<tnPhf-3Fu-3@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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Currently, the driver expects DEVICE_CONNECTED is automatically set
by the hardware, but this feature is disabled in some cases.
In such cases, it is the software's responsibility to set up the
DEVICES_CONNECTED register.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
---

Changes in v2: None

 drivers/mtd/nand/denali.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/mtd/nand/denali.c b/drivers/mtd/nand/denali.c
index abf8997..3da0a0e 100644
--- a/drivers/mtd/nand/denali.c
+++ b/drivers/mtd/nand/denali.c
@@ -1472,6 +1472,15 @@ static int denali_multidev_fixup(struct denali_nand_info *denali)
 	 */
 	denali->devnum = ioread32(denali->flash_reg + DEVICES_CONNECTED);
 
+	/*
+	 * On some SoCs, DEVICES_CONNECTED is not auto-detected.
+	 * For those, DEVICES_CONNECTED is left to 0.  Set 1 if it is the case.
+	 */
+	if (denali->devnum == 0) {
+		denali->devnum = 1;
+		iowrite32(1, denali->flash_reg + DEVICES_CONNECTED);
+	}
+
 	if (denali->devnum == 1)
 		return 0;
 
-- 
2.7.4

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[PATCH v2 23/53] mtd: nand: denali: set DEVICES_CONNECTED 1 if not set Masahiro Yamada <yamada.masahiro@socionext.com> - 2017-03-22 15:20 +0100

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