[PATCH for 4.14.y 1/2] mtd: cfi_cmdset_0002: Move and rename chip_check/chip_ready/chip_good_for_write
This is a preparation patch for the S29GL064N buffer writes fix. There is no functional change.
Link: https://lore.kernel.org/r/b687c259-6413-26c9-d4c9-b3afa69ea124@pengutronix.d... Fixes: dfeae1073583("mtd: cfi_cmdset_0002: Change write buffer to check correct value") Signed-off-by: Tokunori Ikegami ikegami.t@gmail.com Cc: stable@vger.kernel.org Acked-by: Vignesh Raghavendra vigneshr@ti.com Signed-off-by: Miquel Raynal miquel.raynal@bootlin.com Link: https://lore.kernel.org/linux-mtd/20220323170458.5608-2-ikegami.t@gmail.com --- drivers/mtd/chips/cfi_cmdset_0002.c | 77 ++++++++++++----------------- 1 file changed, 32 insertions(+), 45 deletions(-)
diff --git a/drivers/mtd/chips/cfi_cmdset_0002.c b/drivers/mtd/chips/cfi_cmdset_0002.c index 870d1f1331b1..a8e1a961e844 100644 --- a/drivers/mtd/chips/cfi_cmdset_0002.c +++ b/drivers/mtd/chips/cfi_cmdset_0002.c @@ -730,50 +730,34 @@ static struct mtd_info *cfi_amdstd_setup(struct mtd_info *mtd) }
/* - * Return true if the chip is ready. + * Return true if the chip is ready and has the correct value. * * Ready is one of: read mode, query mode, erase-suspend-read mode (in any * non-suspended sector) and is indicated by no toggle bits toggling. * + * Error are indicated by toggling bits or bits held with the wrong value, + * or with bits toggling. + * * Note that anything more complicated than checking if no bits are toggling * (including checking DQ5 for an error status) is tricky to get working * correctly and is therefore not done (particularly with interleaved chips * as each chip must be checked independently of the others). */ -static int __xipram chip_ready(struct map_info *map, unsigned long addr) +static int __xipram chip_ready(struct map_info *map, unsigned long addr, + map_word *expected) { map_word d, t; + int ret;
d = map_read(map, addr); t = map_read(map, addr);
- return map_word_equal(map, d, t); -} + ret = map_word_equal(map, d, t);
-/* - * Return true if the chip is ready and has the correct value. - * - * Ready is one of: read mode, query mode, erase-suspend-read mode (in any - * non-suspended sector) and it is indicated by no bits toggling. - * - * Error are indicated by toggling bits or bits held with the wrong value, - * or with bits toggling. - * - * Note that anything more complicated than checking if no bits are toggling - * (including checking DQ5 for an error status) is tricky to get working - * correctly and is therefore not done (particularly with interleaved chips - * as each chip must be checked independently of the others). - * - */ -static int __xipram chip_good(struct map_info *map, unsigned long addr, map_word expected) -{ - map_word oldd, curd; - - oldd = map_read(map, addr); - curd = map_read(map, addr); + if (!ret || !expected) + return ret;
- return map_word_equal(map, oldd, curd) && - map_word_equal(map, curd, expected); + return map_word_equal(map, t, *expected); }
static int get_chip(struct map_info *map, struct flchip *chip, unsigned long adr, int mode) @@ -790,7 +774,7 @@ static int get_chip(struct map_info *map, struct flchip *chip, unsigned long adr
case FL_STATUS: for (;;) { - if (chip_ready(map, adr)) + if (chip_ready(map, adr, NULL)) break;
if (time_after(jiffies, timeo)) { @@ -828,7 +812,7 @@ static int get_chip(struct map_info *map, struct flchip *chip, unsigned long adr chip->state = FL_ERASE_SUSPENDING; chip->erase_suspended = 1; for (;;) { - if (chip_ready(map, adr)) + if (chip_ready(map, adr, NULL)) break;
if (time_after(jiffies, timeo)) { @@ -1361,7 +1345,7 @@ static int do_otp_lock(struct map_info *map, struct flchip *chip, loff_t adr, /* wait for chip to become ready */ timeo = jiffies + msecs_to_jiffies(2); for (;;) { - if (chip_ready(map, adr)) + if (chip_ready(map, adr, NULL)) break;
if (time_after(jiffies, timeo)) { @@ -1628,10 +1612,11 @@ static int __xipram do_write_oneword(struct map_info *map, struct flchip *chip, }
/* - * We check "time_after" and "!chip_good" before checking - * "chip_good" to avoid the failure due to scheduling. + * We check "time_after" and "!chip_ready" before checking + * "chip_ready" to avoid the failure due to scheduling. */ - if (time_after(jiffies, timeo) && !chip_good(map, adr, datum)) { + if (time_after(jiffies, timeo) && + !chip_ready(map, adr, &datum)) { xip_enable(map, chip, adr); printk(KERN_WARNING "MTD %s(): software timeout\n", __func__); xip_disable(map, chip, adr); @@ -1639,7 +1624,7 @@ static int __xipram do_write_oneword(struct map_info *map, struct flchip *chip, break; }
- if (chip_good(map, adr, datum)) + if (chip_ready(map, adr, &datum)) break;
/* Latency issues. Drop the lock, wait a while and retry */ @@ -1883,13 +1868,13 @@ static int __xipram do_write_buffer(struct map_info *map, struct flchip *chip, }
/* - * We check "time_after" and "!chip_good" before checking "chip_good" to avoid - * the failure due to scheduling. + * We check "time_after" and "!chip_ready" before checking + * "chip_ready" to avoid the failure due to scheduling. */ - if (time_after(jiffies, timeo) && !chip_good(map, adr, datum)) + if (time_after(jiffies, timeo) && !chip_ready(map, adr, &datum)) break;
- if (chip_good(map, adr, datum)) { + if (chip_ready(map, adr, &datum)) { xip_enable(map, chip, adr); goto op_done; } @@ -2023,7 +2008,7 @@ static int cfi_amdstd_panic_wait(struct map_info *map, struct flchip *chip, * If the driver thinks the chip is idle, and no toggle bits * are changing, then the chip is actually idle for sure. */ - if (chip->state == FL_READY && chip_ready(map, adr)) + if (chip->state == FL_READY && chip_ready(map, adr, NULL)) return 0;
/* @@ -2040,7 +2025,7 @@ static int cfi_amdstd_panic_wait(struct map_info *map, struct flchip *chip,
/* wait for the chip to become ready */ for (i = 0; i < jiffies_to_usecs(timeo); i++) { - if (chip_ready(map, adr)) + if (chip_ready(map, adr, NULL)) return 0;
udelay(1); @@ -2104,13 +2089,13 @@ static int do_panic_write_oneword(struct map_info *map, struct flchip *chip, map_write(map, datum, adr);
for (i = 0; i < jiffies_to_usecs(uWriteTimeout); i++) { - if (chip_ready(map, adr)) + if (chip_ready(map, adr, NULL)) break;
udelay(1); }
- if (!chip_good(map, adr, datum)) { + if (!chip_ready(map, adr, &datum)) { /* reset on all failures. */ map_write(map, CMD(0xF0), chip->start); /* FIXME - should have reset delay before continuing */ @@ -2251,6 +2236,7 @@ static int __xipram do_erase_chip(struct map_info *map, struct flchip *chip) DECLARE_WAITQUEUE(wait, current); int ret = 0; int retry_cnt = 0; + map_word datum = map_word_ff(map);
adr = cfi->addr_unlock1;
@@ -2305,7 +2291,7 @@ static int __xipram do_erase_chip(struct map_info *map, struct flchip *chip) chip->erase_suspended = 0; }
- if (chip_good(map, adr, map_word_ff(map))) + if (chip_ready(map, adr, &datum)) break;
if (time_after(jiffies, timeo)) { @@ -2347,6 +2333,7 @@ static int __xipram do_erase_oneblock(struct map_info *map, struct flchip *chip, DECLARE_WAITQUEUE(wait, current); int ret = 0; int retry_cnt = 0; + map_word datum = map_word_ff(map);
adr += chip->start;
@@ -2401,7 +2388,7 @@ static int __xipram do_erase_oneblock(struct map_info *map, struct flchip *chip, chip->erase_suspended = 0; }
- if (chip_good(map, adr, map_word_ff(map))) { + if (chip_ready(map, adr, &datum)) { xip_enable(map, chip, adr); break; } @@ -2616,7 +2603,7 @@ static int __maybe_unused do_ppb_xxlock(struct map_info *map, */ timeo = jiffies + msecs_to_jiffies(2000); /* 2s max (un)locking */ for (;;) { - if (chip_ready(map, adr)) + if (chip_ready(map, adr, NULL)) break;
if (time_after(jiffies, timeo)) {
Since commit dfeae1073583("mtd: cfi_cmdset_0002: Change write buffer to check correct value") buffered writes fail on S29GL064N. This is because, on S29GL064N, reads return 0xFF at the end of DQ polling for write completion, where as, chip_good() check expects actual data written to the last location to be returned post DQ polling completion. Fix is to revert to using chip_good() for S29GL064N which only checks for DQ lines to settle down to determine write completion.
Link: https://lore.kernel.org/r/b687c259-6413-26c9-d4c9-b3afa69ea124@pengutronix.d... Fixes: dfeae1073583("mtd: cfi_cmdset_0002: Change write buffer to check correct value") Cc: stable@vger.kernel.org Signed-off-by: Tokunori Ikegami ikegami.t@gmail.com Acked-by: Vignesh Raghavendra vigneshr@ti.com Signed-off-by: Miquel Raynal miquel.raynal@bootlin.com Link: https://lore.kernel.org/linux-mtd/20220323170458.5608-3-ikegami.t@gmail.com --- drivers/mtd/chips/cfi_cmdset_0002.c | 42 +++++++++++++++++++++++------ include/linux/mtd/cfi.h | 1 + 2 files changed, 35 insertions(+), 8 deletions(-)
diff --git a/drivers/mtd/chips/cfi_cmdset_0002.c b/drivers/mtd/chips/cfi_cmdset_0002.c index a8e1a961e844..e3477b5bceaf 100644 --- a/drivers/mtd/chips/cfi_cmdset_0002.c +++ b/drivers/mtd/chips/cfi_cmdset_0002.c @@ -49,6 +49,10 @@ #define SST49LF008A 0x005a #define AT49BV6416 0x00d6
+enum cfi_quirks { + CFI_QUIRK_DQ_TRUE_DATA = BIT(0), +}; + static int cfi_amdstd_read (struct mtd_info *, loff_t, size_t, size_t *, u_char *); static int cfi_amdstd_write_words(struct mtd_info *, loff_t, size_t, size_t *, const u_char *); static int cfi_amdstd_write_buffers(struct mtd_info *, loff_t, size_t, size_t *, const u_char *); @@ -365,6 +369,15 @@ static void fixup_s29ns512p_sectors(struct mtd_info *mtd) mtd->name); }
+static void fixup_quirks(struct mtd_info *mtd) +{ + struct map_info *map = mtd->priv; + struct cfi_private *cfi = map->fldrv_priv; + + if (cfi->mfr == CFI_MFR_AMD && cfi->id == 0x0c01) + cfi->quirks |= CFI_QUIRK_DQ_TRUE_DATA; +} + /* Used to fix CFI-Tables of chips without Extended Query Tables */ static struct cfi_fixup cfi_nopri_fixup_table[] = { { CFI_MFR_SST, 0x234a, fixup_sst39vf }, /* SST39VF1602 */ @@ -403,6 +416,7 @@ static struct cfi_fixup cfi_fixup_table[] = { #if !FORCE_WORD_WRITE { CFI_MFR_ANY, CFI_ID_ANY, fixup_use_write_buffers }, #endif + { CFI_MFR_ANY, CFI_ID_ANY, fixup_quirks }, { 0, 0, NULL } }; static struct cfi_fixup jedec_fixup_table[] = { @@ -760,6 +774,18 @@ static int __xipram chip_ready(struct map_info *map, unsigned long addr, return map_word_equal(map, t, *expected); }
+static int __xipram chip_good(struct map_info *map, unsigned long addr, + map_word *expected) +{ + struct cfi_private *cfi = map->fldrv_priv; + map_word *datum = expected; + + if (cfi->quirks & CFI_QUIRK_DQ_TRUE_DATA) + datum = NULL; + + return chip_ready(map, addr, datum); +} + static int get_chip(struct map_info *map, struct flchip *chip, unsigned long adr, int mode) { DECLARE_WAITQUEUE(wait, current); @@ -1612,11 +1638,11 @@ static int __xipram do_write_oneword(struct map_info *map, struct flchip *chip, }
/* - * We check "time_after" and "!chip_ready" before checking - * "chip_ready" to avoid the failure due to scheduling. + * We check "time_after" and "!chip_good" before checking + * "chip_good" to avoid the failure due to scheduling. */ if (time_after(jiffies, timeo) && - !chip_ready(map, adr, &datum)) { + !chip_good(map, adr, &datum)) { xip_enable(map, chip, adr); printk(KERN_WARNING "MTD %s(): software timeout\n", __func__); xip_disable(map, chip, adr); @@ -1624,7 +1650,7 @@ static int __xipram do_write_oneword(struct map_info *map, struct flchip *chip, break; }
- if (chip_ready(map, adr, &datum)) + if (chip_good(map, adr, &datum)) break;
/* Latency issues. Drop the lock, wait a while and retry */ @@ -1868,13 +1894,13 @@ static int __xipram do_write_buffer(struct map_info *map, struct flchip *chip, }
/* - * We check "time_after" and "!chip_ready" before checking - * "chip_ready" to avoid the failure due to scheduling. + * We check "time_after" and "!chip_good" before checking + * "chip_good" to avoid the failure due to scheduling. */ - if (time_after(jiffies, timeo) && !chip_ready(map, adr, &datum)) + if (time_after(jiffies, timeo) && !chip_good(map, adr, &datum)) break;
- if (chip_ready(map, adr, &datum)) { + if (chip_good(map, adr, &datum)) { xip_enable(map, chip, adr); goto op_done; } diff --git a/include/linux/mtd/cfi.h b/include/linux/mtd/cfi.h index 9b57a9b1b081..4ead3d1559f5 100644 --- a/include/linux/mtd/cfi.h +++ b/include/linux/mtd/cfi.h @@ -293,6 +293,7 @@ struct cfi_private { map_word sector_erase_cmd; unsigned long chipshift; /* Because they're of the same type */ const char *im_name; /* inter_module name for cmdset_setup */ + unsigned long quirks; struct flchip chips[0]; /* per-chip data structure for each chip */ };
linux-stable-mirror@lists.linaro.org
-
Tokunori Ikegami