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Message-ID: <YqbWt9f3of+7Z76e@lahna>
Date: Mon, 13 Jun 2022 09:18:31 +0300
From: Mika Westerberg <mika.westerberg@...ux.intel.com>
To: Oleksandr Ocheretnyi <oocheret@...co.com>
Cc: tudor.ambarus@...rochip.com, miquel.raynal@...tlin.com,
p.yadav@...com, michael@...le.cc, richard@....at, vigneshr@...com,
broonie@...nel.org, linux-mtd@...ts.infradead.org,
linux-spi@...r.kernel.org, mauro.lima@...ypsium.com,
lee.jones@...aro.org, linux-kernel@...r.kernel.org,
xe-linux-external@...co.com
Subject: Re: [PATCH] mtd: spi-nor: handle unsupported FSR opcodes properly
Hi,
On Fri, Jun 10, 2022 at 12:15:48PM -0700, Oleksandr Ocheretnyi wrote:
> Commit 094d3b9 ("mtd: spi-nor: Add USE_FSR flag for n25q* entries")
> and following one 8f93826 ("mtd: spi-nor: micron-st: convert USE_FSR
> to a manufacturer flag") enables SPINOR_OP_RDFSR opcode handling ability,
> however some controller drivers still cannot handle it properly in
> the micron_st_nor_ready() call what breaks some mtd callbacks with
> next error logs:
>
> mtdblock: erase of region [address1, size1] on "BIOS" failed
> mtdblock: erase of region [address2, size2] on "BIOS" failed
>
> Just skip subsequent processing of the SPINOR_OP_RDFSR opcode's results
> because of -ENOTSUPP return value of the micron_st_nor_read_fsr()
> if there is no proper handling of that opcode as it's been before
> commit 094d3b9 ("mtd: spi-nor: Add USE_FSR flag for n25q* entries")
>
> Signed-off-by: Oleksandr Ocheretnyi <oocheret@...co.com>
I sent similar patch some time ago here:
https://lore.kernel.org/linux-mtd/20220506105158.43613-1-mika.westerberg@linux.intel.com/#t
but so far it has not been picked up by the maintainers. I'm fine if we
go with your patch instead, just one minor comment:
> ---
> drivers/mtd/spi-nor/micron-st.c | 6 +++++-
> drivers/spi/spi-intel.c | 3 ++-
> 2 files changed, 7 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/mtd/spi-nor/micron-st.c b/drivers/mtd/spi-nor/micron-st.c
> index a96f74e0f568..507e675d81e0 100644
> --- a/drivers/mtd/spi-nor/micron-st.c
> +++ b/drivers/mtd/spi-nor/micron-st.c
> @@ -399,8 +399,12 @@ static int micron_st_nor_ready(struct spi_nor *nor)
> return sr_ready;
>
> ret = micron_st_nor_read_fsr(nor, nor->bouncebuf);
> - if (ret)
> + if (ret < 0) {
> + /* Check if read FSR is supported. If not, skip it. */
> + if (ret == -ENOTSUPP)
> + return sr_ready;
> return ret;
> + }
>
> if (nor->bouncebuf[0] & (FSR_E_ERR | FSR_P_ERR)) {
> if (nor->bouncebuf[0] & FSR_E_ERR)
> diff --git a/drivers/spi/spi-intel.c b/drivers/spi/spi-intel.c
> index 50f42983b950..f0313a718d1b 100644
> --- a/drivers/spi/spi-intel.c
> +++ b/drivers/spi/spi-intel.c
> @@ -352,7 +352,8 @@ static int intel_spi_hw_cycle(struct intel_spi *ispi, u8 opcode, size_t len)
> val |= HSFSTS_CTL_FCYCLE_RDSR;
> break;
> default:
> - return -EINVAL;
> + dev_dbg(ispi->dev, "%#x not supported\n", opcode);
> + return -ENOTSUPP;
I don't think this is necessary because we already return -EOPNOTSUPP in
intel_spi_exec_mem_op() so we can just check that one in
micron_st_nor_ready().
With that changed feel free to add my,
Reviewed-by: Mika Westerberg <mika.westerberg@...ux.intel.com>
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