On Tue, 16 Oct 2018 09:51:47 +0000
Yogesh Narayan Gaur [off-list ref] wrote:

Hi Tudor,

This patch is breaking the 1-4-4 Read protocol for the spansion flash "s25fl512s".

Without this patch read request command for Quad mode, 4-byte enable, is coming as 0xEC i.e. SPINOR_OP_READ_1_4_4_4B.
But after applying this patch, read request command for Quad mode is coming as 0x6C i.e. SPINOR_OP_READ_1_1_4_4B.

This flash also supports non-uniform erase.
Can you please check and provide some suggestion?

Are you sure the regression comes from this patch? I suspect your bug
comes from 41fe242979e4 ("mtd: spi-nor: fsl-quadspi: fix read error for
flash size larger than 16MB").