diff options
Diffstat (limited to 'target/linux/generic/backport-5.4/408-v5.13-mtd-cfi_cmdset_0002-Disable-buffered-writes-for-AMD.patch')
| -rw-r--r-- | target/linux/generic/backport-5.4/408-v5.13-mtd-cfi_cmdset_0002-Disable-buffered-writes-for-AMD.patch | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/target/linux/generic/backport-5.4/408-v5.13-mtd-cfi_cmdset_0002-Disable-buffered-writes-for-AMD.patch b/target/linux/generic/backport-5.4/408-v5.13-mtd-cfi_cmdset_0002-Disable-buffered-writes-for-AMD.patch new file mode 100644 index 0000000000..3af641e62e --- /dev/null +++ b/target/linux/generic/backport-5.4/408-v5.13-mtd-cfi_cmdset_0002-Disable-buffered-writes-for-AMD.patch @@ -0,0 +1,54 @@ +From 7e4404113686868858a34210c28ae122e967aa64 Mon Sep 17 00:00:00 2001 +From: Mauri Sandberg <sandberg@mailfence.com> +Date: Tue, 9 Mar 2021 19:48:59 +0200 +Subject: [PATCH] mtd: cfi_cmdset_0002: Disable buffered writes for AMD chip + 0x2201 + +Buffer writes do not work with AMD chip 0x2201. The chip in question +is a AMD/Spansion/Cypress Semiconductor S29GL256N and datasheet [1] +talks about writing buffers being possible. While waiting for a neater +solution resort to writing word-sized chunks only. + +Without the patch kernel logs will be flooded with entries like below: + +jffs2_scan_eraseblock(): End of filesystem marker found at 0x0 +jffs2_build_filesystem(): unlocking the mtd device... +done. +jffs2_build_filesystem(): erasing all blocks after the end marker... +MTD do_write_buffer_wait(): software timeout, address:0x01ec000a. +jffs2: Write clean marker to block at 0x01920000 failed: -5 +MTD do_write_buffer_wait(): software timeout, address:0x01e2000a. +jffs2: Write clean marker to block at 0x01880000 failed: -5 +MTD do_write_buffer_wait(): software timeout, address:0x01e0000a. +jffs2: Write clean marker to block at 0x01860000 failed: -5 +MTD do_write_buffer_wait(): software timeout, address:0x01dc000a. +jffs2: Write clean marker to block at 0x01820000 failed: -5 +MTD do_write_buffer_wait(): software timeout, address:0x01da000a. +jffs2: Write clean marker to block at 0x01800000 failed: -5 +... + +Tested on a Buffalo wzr-hp-g300nh running kernel 5.10.16. + +[1] https://www.cypress.com/file/219941/download +or https://datasheetspdf.com/pdf-file/565708/SPANSION/S29GL256N/1 + +Signed-off-by: Mauri Sandberg <sandberg@mailfence.com> +Signed-off-by: Vignesh Raghavendra <vigneshr@ti.com> +Link: https://lore.kernel.org/r/20210309174859.362060-1-sandberg@mailfence.com +--- + drivers/mtd/chips/cfi_cmdset_0002.c | 4 ++++ + 1 file changed, 4 insertions(+) + +--- a/drivers/mtd/chips/cfi_cmdset_0002.c ++++ b/drivers/mtd/chips/cfi_cmdset_0002.c +@@ -272,6 +272,10 @@ static void fixup_use_write_buffers(stru + { + struct map_info *map = mtd->priv; + struct cfi_private *cfi = map->fldrv_priv; ++ ++ if (cfi->mfr == CFI_MFR_AMD && cfi->id == 0x2201) ++ return; ++ + if (cfi->cfiq->BufWriteTimeoutTyp) { + pr_debug("Using buffer write method\n"); + mtd->_write = cfi_amdstd_write_buffers; |