mtd: rawnand: Fix comments about the use of bufpoi

Clarify these comments which are not very accurate (even wrong in the
read case).

Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Reviewed-by: Boris Brezillon <boris.brezillon@collabora.com>
Link: https://lore.kernel.org/linux-mtd/20200507105241.14299-5-miquel.raynal@bootlin.com

diff --git a/drivers/mtd/nand/raw/nand_base.c b/drivers/mtd/nand/raw/nand_base.c
index 906b8cd..7dc7889 100644 (file)
--- a/drivers/mtd/nand/raw/nand_base.c
+++ b/drivers/mtd/nand/raw/nand_base.c
@@ -3279,7 +3279,10 @@ read_retry:
                                break;
                        }
 
-                       /* Transfer not aligned data */
+                       /*
+                        * Copy back the data in the initial buffer when reading
+                        * partial pages or when a bounce buffer is required.
+                        */
                        if (use_bufpoi) {
                                if (!NAND_HAS_SUBPAGE_READ(chip) && !oob &&
                                    !(mtd->ecc_stats.failed - ecc_failures) &&
@@ -4074,7 +4077,10 @@ static int nand_do_write_ops(struct nand_chip *chip, loff_t to,
                else
                        use_bufpoi = 0;
 
-               /* Partial page write?, or need to use bounce buffer */
+               /*
+                * Copy the data from the initial buffer when doing partial page
+                * writes or when a bounce buffer is required.
+                */
                if (use_bufpoi) {
                        pr_debug("%s: using write bounce buffer for buf@%p\n",
                                         __func__, buf);