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Commit 8a2ceac6 authored by Mark Brown's avatar Mark Brown
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regmap: Split raw writes that cross window boundaries 



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: default avatarMark Brown <broonie@opensource.wolfsonmicro.com>
parent 0ff3e62f

drivers/base/regmap/regmap.c

+24 −2
Original line number Original line Diff line number Diff line
@@ -852,8 +852,30 @@ static int _regmap_raw_write(struct regmap *map, unsigned int reg, 




	range = _regmap_range_lookup(map, reg);

	range = _regmap_range_lookup(map, reg);

	if (range) {

	if (range) {

		ret = _regmap_select_page(map, &reg, range,

		int val_num = val_len / map->format.val_bytes;

					  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 / map->format.val_bytes);

			ret = _regmap_raw_write(map, reg, val, win_residue *

						map->format.val_bytes);

			if (ret != 0)

				return ret;



			reg += win_residue;

			val_num -= win_residue;

			val += win_residue * map->format.val_bytes;

			val_len -= win_residue * map->format.val_bytes;



			win_offset = (reg - range->range_min) %

				range->window_len;

			win_residue = range->window_len - win_offset;

		}



		ret = _regmap_select_page(map, &reg, range, val_num);

		if (ret != 0)

		if (ret != 0)

			return ret;

			return ret;

	}

	}