On Tue, Mar 26, 2024 at 12:55:19PM +0530, Manivannan Sadhasivam wrote:
> On Mon, Mar 25, 2024 at 11:30:47AM +0100, Christian Marangi wrote:
> > misc_cmd_type in exec_op have multiple problems. With commit a82990c8a409
> > ("mtd: rawnand: qcom: Add read/read_start ops in exec_op path") it was
> > reworked and generalized but actually broke the handling of the
> > ERASE_BLOCK command.
> >
> > Additional logic was added to the erase command cycle without clear
> > explaination causing the erase command to be broken on testing it on
> > a ipq806x nandc.
> >
> > Fix the erase command by reverting the additional logic and only adding
> > the NAND_DEV0_CFG0 additional call (required for erase command).
> >
> > Fixes: a82990c8a409 ("mtd: rawnand: qcom: Add read/read_start ops in exec_op path")
> > Cc: stable@xxxxxxxxxxxxxxx
> > Signed-off-by: Christian Marangi <ansuelsmth@xxxxxxxxx>
> > ---
> > Changes v2:
> > - Split this and rework commit description and title
> >
> > drivers/mtd/nand/raw/qcom_nandc.c | 5 ++---
> > 1 file changed, 2 insertions(+), 3 deletions(-)
> >
> > diff --git a/drivers/mtd/nand/raw/qcom_nandc.c b/drivers/mtd/nand/raw/qcom_nandc.c
> > index b079605c84d3..19d76e345a49 100644
> > --- a/drivers/mtd/nand/raw/qcom_nandc.c
> > +++ b/drivers/mtd/nand/raw/qcom_nandc.c
> > @@ -2830,9 +2830,8 @@ static int qcom_misc_cmd_type_exec(struct nand_chip *chip, const struct nand_sub
> > nandc_set_reg(chip, NAND_EXEC_CMD, 1);
> >
> > write_reg_dma(nandc, NAND_FLASH_CMD, instrs, NAND_BAM_NEXT_SGL);
> > - (q_op.cmd_reg == OP_BLOCK_ERASE) ? write_reg_dma(nandc, NAND_DEV0_CFG0,
> > - 2, NAND_BAM_NEXT_SGL) : read_reg_dma(nandc,
> > - NAND_FLASH_STATUS, 1, NAND_BAM_NEXT_SGL);
> > + if (q_op.cmd_reg == OP_BLOCK_ERASE)
> > + write_reg_dma(nandc, NAND_DEV0_CFG0, 2, NAND_BAM_NEXT_SGL);
>
> So this only avoids the call to, 'read_reg_dma(nandc, NAND_FLASH_STATUS, 1,
> NAND_BAM_NEXT_SGL)' if q_op.cmd_reg != OP_BLOCK_ERASE. But for q_op.cmd_reg ==
> OP_BLOCK_ERASE, the result is the same.
>
> I'm wondering how it results in fixing the OP_BLOCK_ERASE command.
>
Perhaps you are trying to fix the OP_RESET_DEVICE command altogether?
- Mani
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