Messages in this thread Patch in this message | | | Date | Fri, 6 Oct 2023 14:33:11 +0100 | Subject | Re: [PATCH v2] mtd: micron-st: enable lock/unlock for mt25qu512a | From | Tudor Ambarus <> |
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Hi,
Thanks for the debugging info.
On 10/6/23 11:30, SHUKLA Mamta Ramendra wrote:
cut
> -------------------------------------------------------- > > IMO, HAS_16BIT_SR flag is causing lock/unlock failure, > since BP bits are calculated wrong then. > > I tested also for a case where I don't parse SFDP and > reverted the condition in micron_st_nor_default_init() > for 16BIT Status Register Flag. And lock/unlock fails with > same log as Non-working case. > > And this mt25qu512 has 8-BIT SR as typical micron-st flash. >
Indeed, the problem is that HAS_16BIT_SR gets set when it shouldn't have to. This means that the BFPT table of the flash is wrong and we should fix the parsed settings via a post_bfpt hook.
Does the following fix your problem?
diff --git a/drivers/mtd/spi-nor/micron-st.c b/drivers/mtd/spi-nor/micron-st.c index 4afcfc57c896..733bbddc6829 100644 --- a/drivers/mtd/spi-nor/micron-st.c +++ b/drivers/mtd/spi-nor/micron-st.c @@ -180,6 +180,17 @@ static const struct flash_info micron_nor_parts[] = { }, };
+static int mt25qu512a_post_bfpt_fixup(struct spi_nor *nor, + const struct sfdp_parameter_header *bfpt_header, + const struct sfdp_bfpt *bfpt) +{ + nor->flags &= ~SNOR_F_HAS_16BIT_SR; +} + +static struct spi_nor_fixups mt25qu512a_fixups = { + .post_bfpt = mt25qu512a_post_bfpt_fixup, +} + static const struct flash_info st_nor_parts[] = { { .name = "m25p05-nonjedec", @@ -405,10 +416,10 @@ static const struct flash_info st_nor_parts[] = { }, { .id = SNOR_ID(0x20, 0xbb, 0x20, 0x10, 0x44, 0x00), .name = "mt25qu512a", - .size = SZ_64M, - .no_sfdp_flags = SECT_4K | SPI_NOR_DUAL_READ | SPI_NOR_QUAD_READ, - .fixup_flags = SPI_NOR_4B_OPCODES, + .flags = SPI_NOR_HAS_LOCK | SPI_NOR_HAS_TB | SPI_NOR_4BIT_BP | + SPI_NOR_BP3_SR_BIT6, .mfr_flags = USE_FSR, + .fixups = &mt25qu512a_fixups, }, { .id = SNOR_ID(0x20, 0xbb, 0x20), .name = "n25q512a",
If yes, please add some prints in sfdp.c to determine where it's set, either in BFPT_DWORD15_QER_SR2_BIT1 or BFPT_DWORD15_QER_SR2_BIT1_NO_RD
Is the datasheet for this flash public? Would you send me a link to it please?
Cheers, ta
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