diff options
Diffstat (limited to 'target/linux/mvebu/patches-3.10/0162-mtd-nand-pxa3xx-Clear-need_wait-flag-when-starting-a.patch')
| -rw-r--r-- | target/linux/mvebu/patches-3.10/0162-mtd-nand-pxa3xx-Clear-need_wait-flag-when-starting-a.patch | 50 |
1 files changed, 0 insertions, 50 deletions
diff --git a/target/linux/mvebu/patches-3.10/0162-mtd-nand-pxa3xx-Clear-need_wait-flag-when-starting-a.patch b/target/linux/mvebu/patches-3.10/0162-mtd-nand-pxa3xx-Clear-need_wait-flag-when-starting-a.patch deleted file mode 100644 index 5665ca1..0000000 --- a/target/linux/mvebu/patches-3.10/0162-mtd-nand-pxa3xx-Clear-need_wait-flag-when-starting-a.patch +++ /dev/null @@ -1,50 +0,0 @@ -From 7efaa8677ffd07d54d0122b5e92f29b74a36ad39 Mon Sep 17 00:00:00 2001 -From: Ezequiel Garcia <ezequiel.garcia@free-electrons.com> -Date: Thu, 19 Dec 2013 06:08:03 -0300 -Subject: [PATCH 162/203] mtd: nand: pxa3xx: Clear need_wait flag when starting - a command - -Currently the driver assumes all commands will eventually trigger a RnB -transition, and thus a "device is ready" IRQ. - -This assumption means that on every issued command, the dev_ready completion -handler is init'ed and the need_wait flag is set. - -However this is incorrect: some commands (such as NAND_CMD_STATUS) don't -make the device 'busy' and thus a RnB transition never occurs. -Given, the NAND core never calls waitfunc() after such commands, this -is not a problem. - -Therefore, it's possible to only clear the need_wait flag on every command -that is started. - -This fixes a current bug that can be reproduced on PXA boards by writing -blank (all 0xff'ed) to a page: - - 1. The kernel issues NAND_CMD_STATUS and sets need_wait=1. The flag - won't be cleared for this command since no RnB transition is - involved. - - 2. NAND_CMD_PAGEPROG is issued but since the data is blank, the driver - decides not to execute the command (and no IRQ activity is - involved). - - 3. The NAND core calls waitfunc() and waits for the dev_ready - completion, which will never end since the device _is_ already ready. - -Tested-by: Arnaud Ebalard <arno@natisbad.org> -Signed-off-by: Ezequiel Garcia <ezequiel.garcia@free-electrons.com> ---- - drivers/mtd/nand/pxa3xx_nand.c | 1 + - 1 file changed, 1 insertion(+) - ---- a/drivers/mtd/nand/pxa3xx_nand.c -+++ b/drivers/mtd/nand/pxa3xx_nand.c -@@ -694,6 +694,7 @@ static void prepare_start_command(struct - info->retcode = ERR_NONE; - info->ecc_err_cnt = 0; - info->ndcb3 = 0; -+ info->need_wait = 0; - - switch (command) { - case NAND_CMD_READ0: |