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| author | Miquel Raynal <miquel.raynal@bootlin.com> | 2021-05-05 23:37:43 +0200 |
|---|---|---|
| committer | Miquel Raynal <miquel.raynal@bootlin.com> | 2021-05-26 10:43:59 +0200 |
| commit | e32df79f19c756f072bd517ece65df1efd496f95 (patch) | |
| tree | 8fabd205d8a89f0fe7516812cd6afe5b6ecc400b /drivers/mtd/nand/raw/nand_timings.c | |
| parent | mtd: rawnand: Handle the double bytes in NV-DDR mode (diff) | |
| download | linux-e32df79f19c756f072bd517ece65df1efd496f95.tar.xz linux-e32df79f19c756f072bd517ece65df1efd496f95.zip | |
mtd: rawnand: Add a helper to find the closest ONFI NV-DDR mode
Introduce a similar helper to onfi_find_closest_sdr_mode(), but for
NV-DDR timings. It just takes a timing structure as parameter and
returns the closest mode by comparing all minimum timings. This is
useful for rigid controllers on which tuning the timings is not
possible.
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/linux-mtd/20210505213750.257417-16-miquel.raynal@bootlin.com
Diffstat (limited to 'drivers/mtd/nand/raw/nand_timings.c')
| -rw-r--r-- | drivers/mtd/nand/raw/nand_timings.c | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/drivers/mtd/nand/raw/nand_timings.c b/drivers/mtd/nand/raw/nand_timings.c index 8eaa132c3900..7b41afc372d2 100644 --- a/drivers/mtd/nand/raw/nand_timings.c +++ b/drivers/mtd/nand/raw/nand_timings.c @@ -601,6 +601,48 @@ onfi_find_closest_sdr_mode(const struct nand_sdr_timings *spec_timings) } /** + * onfi_find_closest_nvddr_mode - Derive the closest ONFI NVDDR timing mode + * given a set of timings + * @spec_timings: the timings to challenge + */ +unsigned int +onfi_find_closest_nvddr_mode(const struct nand_nvddr_timings *spec_timings) +{ + const struct nand_nvddr_timings *onfi_timings; + int mode; + + for (mode = ARRAY_SIZE(onfi_nvddr_timings) - 1; mode > 0; mode--) { + onfi_timings = &onfi_nvddr_timings[mode].timings.nvddr; + + if (spec_timings->tCCS_min <= onfi_timings->tCCS_min && + spec_timings->tAC_min <= onfi_timings->tAC_min && + spec_timings->tADL_min <= onfi_timings->tADL_min && + spec_timings->tCAD_min <= onfi_timings->tCAD_min && + spec_timings->tCAH_min <= onfi_timings->tCAH_min && + spec_timings->tCALH_min <= onfi_timings->tCALH_min && + spec_timings->tCALS_min <= onfi_timings->tCALS_min && + spec_timings->tCAS_min <= onfi_timings->tCAS_min && + spec_timings->tCEH_min <= onfi_timings->tCEH_min && + spec_timings->tCH_min <= onfi_timings->tCH_min && + spec_timings->tCK_min <= onfi_timings->tCK_min && + spec_timings->tCS_min <= onfi_timings->tCS_min && + spec_timings->tDH_min <= onfi_timings->tDH_min && + spec_timings->tDQSCK_min <= onfi_timings->tDQSCK_min && + spec_timings->tDQSD_min <= onfi_timings->tDQSD_min && + spec_timings->tDS_min <= onfi_timings->tDS_min && + spec_timings->tDSC_min <= onfi_timings->tDSC_min && + spec_timings->tRHW_min <= onfi_timings->tRHW_min && + spec_timings->tRR_min <= onfi_timings->tRR_min && + spec_timings->tWHR_min <= onfi_timings->tWHR_min && + spec_timings->tWRCK_min <= onfi_timings->tWRCK_min && + spec_timings->tWW_min <= onfi_timings->tWW_min) + return mode; + } + + return 0; +} + +/* * onfi_fill_sdr_interface_config - Initialize a SDR interface config from a * given ONFI mode * @chip: The NAND chip |