[PATCH v5 03/25] mtd: spi-nor: Refactor Read Status/Write Status support

[Miquel Raynal]

Hello Jon,

On 10/09/2026 at 05:38:01 +01, Jon Hunter <jonathanh at nvidia.com> wrote:

> Hi Miguel,
>
> On 04/09/2026 19:12, Miquel Raynal wrote:
>
> ...
>
>> This is a really hard to review patch, it is big, full of changes
>> everywhere, but I cannot really split it further. The commit log is
>> really important, it tries to explain the steps I went through when
>> trying to refactor the whole QE/SR handling for which I received
>> feedback from Michael, Tudor and Sashiko.
>> Ideally we could expect test coverage of each case:
>> - BFPT_DWORD15_QER_NONE: Probably not needed
>> - BFPT_DWORD15_QER_SR2_BIT1_BUGGY: Expected from Hsin-Yi (flag is being
>>    renamed _NO_1B_WR)
>> - BFPT_DWORD15_QER_SR2_BIT1_NO_RD: Tested with a chip re-enabling RDCR
>>    in a fixup
>> - BFPT_DWORD15_QER_SR1_BIT6: TBD
>> - BFPT_DWORD15_QER_SR2_BIT7: TBD
>> - BFPT_DWORD15_QER_SR2_BIT1: TBD
>> - BFPT_DWORD15_QER_SR2_BIT1_1B: Done.
>> There will probably be breakages on older chips. These cannot be
>> guessed because they are not properly listed in manufacturer
>> fixups (yet). If we want a cleanup/simplification, we will have to cope
>> with this risk.
>> I hope the diff stats will motivate people to have a look and report
>> their testing.
>> I will also eagerly monitor Sashiko's output which will probably be
>> very useful to catch niche weird cases where these changes might break.
>
>
> Since this landed in -next I am seeing a flash/boot issue on one of our
> Jetson boards. This board, Tegra234 Jetson Orin Nano
> (tegra234-p3768-0000+p3767-0005.dts), uses a QSPI flash device and the
> kernel is used to flash this device. Following this commit, on boot I
> now see ...
>
> spi-nor spi0.0: probe with driver spi-nor failed with error -22

Thanks for catching this early! I'll get back to you with a proposal
very soon.

Miquèl