mtd: cfi_cmdset_0002: Use chip_ready() for write on S29GL064N

commit 0a8e98305f63deaf0a799d5cf5532cc83af035d1 upstream.

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.de/
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
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/mtd/chips/cfi_cmdset_0002.c b/drivers/mtd/chips/cfi_cmdset_0002.c
index 9ccde90dc180de654870fe601be70ce4805df993..59334530dd46fb80f445569898cac4db778448c3 100644 (file)
--- a/drivers/mtd/chips/cfi_cmdset_0002.c
+++ b/drivers/mtd/chips/cfi_cmdset_0002.c
@@ -59,6 +59,10 @@
 #define CFI_SR_WBASB           BIT(3)
 #define CFI_SR_SLSB            BIT(1)
 
+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 *);
 #if !FORCE_WORD_WRITE
@@ -436,6 +440,15 @@ 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 */
@@ -474,6 +487,7 @@ 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[] = {
@@ -846,6 +860,18 @@ static int __xipram chip_ready(struct map_info *map, struct flchip *chip,
        return map_word_equal(map, t, *expected);
 }
 
+static int __xipram chip_good(struct map_info *map, struct flchip *chip,
+                             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, chip, addr, datum);
+}
+
 static int get_chip(struct map_info *map, struct flchip *chip, unsigned long adr, int mode)
 {
        DECLARE_WAITQUEUE(wait, current);
@@ -1662,11 +1688,11 @@ static int __xipram do_write_oneword_once(struct map_info *map,
                }
 
                /*
-                * 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, chip, adr, &datum)) {
+                   !chip_good(map, chip, adr, &datum)) {
                        xip_enable(map, chip, adr);
                        printk(KERN_WARNING "MTD %s(): software timeout\n", __func__);
                        xip_disable(map, chip, adr);
@@ -1674,7 +1700,7 @@ static int __xipram do_write_oneword_once(struct map_info *map,
                        break;
                }
 
-               if (chip_ready(map, chip, adr, &datum)) {
+               if (chip_good(map, chip, adr, &datum)) {
                        if (cfi_check_err_status(map, chip, adr))
                                ret = -EIO;
                        break;
@@ -1942,18 +1968,18 @@ static int __xipram do_write_buffer_wait(struct map_info *map,
                }
 
                /*
-                * 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, chip, adr, &datum)) {
+                   !chip_good(map, chip, adr, &datum)) {
                        pr_err("MTD %s(): software timeout, address:0x%.8lx.\n",
                               __func__, adr);
                        ret = -EIO;
                        break;
                }
 
-               if (chip_ready(map, chip, adr, &datum)) {
+               if (chip_good(map, chip, adr, &datum)) {
                        if (cfi_check_err_status(map, chip, adr))
                                ret = -EIO;
                        break;

diff --git a/include/linux/mtd/cfi.h b/include/linux/mtd/cfi.h
index fd1ecb8211060accb59065d07217d1ded9bdd4f6..d88bb56c18e2e9d78308f85e4e843fee790422a3 100644 (file)
--- a/include/linux/mtd/cfi.h
+++ b/include/linux/mtd/cfi.h
@@ -286,6 +286,7 @@ 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[];  /* per-chip data structure for each chip */
 };