| Message ID | 20220101074250.14443-13-a-nandan@ti.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | mtd: spinand: Add Octal DTR SPI (8D-8D-8D) mode support | expand |
On Sat, 1 Jan 2022 13:12:45 +0530 Apurva Nandan <a-nandan@ti.com> wrote: > The flash might or might not have gone a power-down during sleep. > Hence, its SPI IO mode is unpredictable for the core at the time of > resume. To ensure proper reinitialization during resume, disable the > Octal DTR SPI IO mode and bring the flash to 1S-1S-1S mode when > performing suspend using mtd_suspend(). > > Signed-off-by: Apurva Nandan <a-nandan@ti.com> > --- > drivers/mtd/nand/spi/core.c | 11 +++++++++++ > 1 file changed, 11 insertions(+) > > diff --git a/drivers/mtd/nand/spi/core.c b/drivers/mtd/nand/spi/core.c > index 2fd08085db6f..9d1c72634e5a 100644 > --- a/drivers/mtd/nand/spi/core.c > +++ b/drivers/mtd/nand/spi/core.c > @@ -1307,6 +1307,16 @@ static void spinand_mtd_resume(struct mtd_info *mtd) > spinand_ecc_enable(spinand, false); > } > > +static int spinand_mtd_suspend(struct mtd_info *mtd) > +{ > + struct spinand_device *spinand = mtd_to_spinand(mtd); > + > + if (spinand->ctrl_ops->protocol == SPINAND_8D_8D_8D) > + return spinand_init_octal_dtr_disable(spinand); Ok, so you're calling it here. I'd re-order commmits so that DTR support is added after the suspend hook is defined, even if this hook does nothing at first. This way you don't have an unused warning in the previous commit, and most importantly, you don't enter 8DTR before you're sure things will be set back to 1S when entering suspend. > + > + return 0; > +} > + > static int spinand_init(struct spinand_device *spinand) > { > struct device *dev = &spinand->spimem->spi->dev; > @@ -1381,6 +1391,7 @@ static int spinand_init(struct spinand_device *spinand) > mtd->_erase = spinand_mtd_erase; > mtd->_max_bad_blocks = nanddev_mtd_max_bad_blocks; > mtd->_resume = spinand_mtd_resume; > + mtd->_suspend = spinand_mtd_suspend; > > if (nand->ecc.engine) { > ret = mtd_ooblayout_count_freebytes(mtd);
diff --git a/drivers/mtd/nand/spi/core.c b/drivers/mtd/nand/spi/core.c index 2fd08085db6f..9d1c72634e5a 100644 --- a/drivers/mtd/nand/spi/core.c +++ b/drivers/mtd/nand/spi/core.c @@ -1307,6 +1307,16 @@ static void spinand_mtd_resume(struct mtd_info *mtd) spinand_ecc_enable(spinand, false); } +static int spinand_mtd_suspend(struct mtd_info *mtd) +{ + struct spinand_device *spinand = mtd_to_spinand(mtd); + + if (spinand->ctrl_ops->protocol == SPINAND_8D_8D_8D) + return spinand_init_octal_dtr_disable(spinand); + + return 0; +} + static int spinand_init(struct spinand_device *spinand) { struct device *dev = &spinand->spimem->spi->dev; @@ -1381,6 +1391,7 @@ static int spinand_init(struct spinand_device *spinand) mtd->_erase = spinand_mtd_erase; mtd->_max_bad_blocks = nanddev_mtd_max_bad_blocks; mtd->_resume = spinand_mtd_resume; + mtd->_suspend = spinand_mtd_suspend; if (nand->ecc.engine) { ret = mtd_ooblayout_count_freebytes(mtd);
The flash might or might not have gone a power-down during sleep. Hence, its SPI IO mode is unpredictable for the core at the time of resume. To ensure proper reinitialization during resume, disable the Octal DTR SPI IO mode and bring the flash to 1S-1S-1S mode when performing suspend using mtd_suspend(). Signed-off-by: Apurva Nandan <a-nandan@ti.com> --- drivers/mtd/nand/spi/core.c | 11 +++++++++++ 1 file changed, 11 insertions(+)