Path: csiph.com!1.us.feeder.erje.net!2.us.feeder.erje.net!feeder.erje.net!1.eu.feeder.erje.net!weretis.net!feeder4.news.weretis.net!news.mixmin.net!aioe.org!news.servidellagleba.it!bofh.it!news.nic.it!robomod
From: Masahiro Yamada <yamada.masahiro@socionext.com>
Newsgroups: linux.kernel
Subject: [RESEND PATCH v2 23/53] mtd: nand: denali: set DEVICES_CONNECTED 1 if not set
Date: Wed, 22 Mar 2017 21:20:03 +0100
Message-ID: <tnUTF-85w-47@gated-at.bofh.it>
References: <tnUTD-85w-3@gated-at.bofh.it>
Sender: robomod@news.nic.it
Approved: robomod@news.nic.it
Lines: 35
Organization: linux.* mail to news gateway
Xref: csiph.com linux.kernel:1606970

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