If a block write covers a paged memory region and crosses a window boundary then rather than failing the write split the transfer up into multiple writes, making the whole process more transparent for drivers.
Signed-off-by: Mark Brown <[email protected]> --- drivers/base/regmap/regmap.c | 21 +++++++++++++++++++-- 1 file changed, 19 insertions(+), 2 deletions(-) diff --git a/drivers/base/regmap/regmap.c b/drivers/base/regmap/regmap.c index baf9586..07ea564 100644 --- a/drivers/base/regmap/regmap.c +++ b/drivers/base/regmap/regmap.c @@ -852,8 +852,25 @@ static int _regmap_raw_write(struct regmap *map, unsigned int reg, range = _regmap_range_lookup(map, reg); if (range) { - ret = _regmap_select_page(map, ®, range, - val_len / map->format.val_bytes); + int val_num = val_len / map->format.val_bytes; + int win_offset = (reg - range->range_min) % range->window_len; + int win_residue = range->window_len - win_offset; + + /* If the write goes beyond the end of the window split it */ + while (val_num > win_residue) { + dev_dbg(map->dev, "Writing window %d/%d\n", + win_residue, val_len); + ret = _regmap_raw_write(map, reg, val, win_residue); + if (ret != 0) + return ret; + + val += win_residue; + val_len -= win_residue; + val_num = val_len / map->format.val_bytes; + win_residue = range->window_len - win_offset; + } + + ret = _regmap_select_page(map, ®, range, val_num); if (ret != 0) return ret; } -- 1.7.10.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
