On Fri, 2022-07-01 at 13:03 +0200, Sascha Hauer wrote: > 06781a5026350 Fixes the calculation of the DEVICE_BUSY_TIMEOUT register > value from busy_timeout_cycles. busy_timeout_cycles is calculated wrong > though: It is calculated based on the maximum page read time, but the > timeout is also used for page write and block erase operations which > require orders of magnitude bigger timeouts. > > Fix this by calculating busy_timeout_cycles from the maximum of > tBERS_max and tPROG_max. 06781a5026350 was merged in v5.19-rc4 and then was picked up by several stable kernels, including v5.15.51. After we have upgraded to v5.15.51 we have observed the issue that Sascha mentioned in his email [1]. As the v5.19-rc6 was released yesterday and this fix is still not applied, the v5.19-rc6 (and all stable kernels that picked up the backport) causes NAND flash data loss on imx targets. I have backported this patch to our internal v5.15.51 based kernel on 4th July 2022 and I can confirm that it does indeed solve the NAND data loss on imx targets. Is it possible for this patch to make it to the v5.19-rc7? > Fixes: 06781a5026350 ("mtd: rawnand: gpmi: Fix setting busy timeout setting") > Fixes: b1206122069aa ("mtd: rawniand: gpmi: use core timings instead of an empirical derivation") > Cc: stable@xxxxxxxxxxxxxxx > Signed-off-by: Sascha Hauer <s.hauer@xxxxxxxxxxxxxx> Tested-by: Tomasz Moń <tomasz.mon@xxxxxxxxxxxxxxx> [1] https://lore.kernel.org/linux-mtd/20220701091909.GE2387@xxxxxxxxxxxxxx/