This is a note to let you know that I've just added the patch titled
mtd: nand: gpmi: reset BCH earlier, too, to avoid NAND startup problems
to the 3.7-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
mtd-nand-gpmi-reset-bch-earlier-too-to-avoid-nand-startup-problems.patch
and it can be found in the queue-3.7 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From 6f2a6a52560ad8d85710aabd92b7a3239b3a6b07 Mon Sep 17 00:00:00 2001
From: Wolfram Sang <[email protected]>
Date: Wed, 5 Dec 2012 21:46:02 +0100
Subject: mtd: nand: gpmi: reset BCH earlier, too, to avoid NAND startup problems
From: Wolfram Sang <[email protected]>
commit 6f2a6a52560ad8d85710aabd92b7a3239b3a6b07 upstream.
It could happen (1 out of 100 times) that NAND did not start up
correctly after warm rebooting, so the kernel could not find the UBI or
DMA timed out due to a stalled BCH. When resetting BCH together with
GPMI, the issue could not be observed anymore (after 10000+ reboots). We
probably need the consistent state already before sending any command to
NAND, even when no ECC is needed. I chose to keep the extra reset for
BCH when changing the flash layout to be on the safe side.
Signed-off-by: Wolfram Sang <[email protected]>
Acked-by: Huang Shijie <[email protected]>
Signed-off-by: Artem Bityutskiy <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
drivers/mtd/nand/gpmi-nand/gpmi-lib.c | 9 +++++++++
1 file changed, 9 insertions(+)
--- a/drivers/mtd/nand/gpmi-nand/gpmi-lib.c
+++ b/drivers/mtd/nand/gpmi-nand/gpmi-lib.c
@@ -166,6 +166,15 @@ int gpmi_init(struct gpmi_nand_data *thi
if (ret)
goto err_out;
+ /*
+ * Reset BCH here, too. We got failures otherwise :(
+ * See later BCH reset for explanation of MX23 handling
+ */
+ ret = gpmi_reset_block(r->bch_regs, GPMI_IS_MX23(this));
+ if (ret)
+ goto err_out;
+
+
/* Choose NAND mode. */
writel(BM_GPMI_CTRL1_GPMI_MODE, r->gpmi_regs + HW_GPMI_CTRL1_CLR);
Patches currently in stable-queue which might be from [email protected] are
queue-3.7/mtd-nand-gpmi-reset-bch-earlier-too-to-avoid-nand-startup-problems.patch
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