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: Mark Brown <broonie@opensource.wolfsonmicro.com>
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0ff3e62ff1
Коммит
8a2ceac661
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@ -852,8 +852,30 @@ static int _regmap_raw_write(struct regmap *map, unsigned int reg,
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range = _regmap_range_lookup(map, reg);
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range = _regmap_range_lookup(map, reg);
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if (range) {
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if (range) {
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ret = _regmap_select_page(map, ®, range,
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int val_num = val_len / map->format.val_bytes;
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val_len / map->format.val_bytes);
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int win_offset = (reg - range->range_min) % range->window_len;
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int win_residue = range->window_len - win_offset;
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/* If the write goes beyond the end of the window split it */
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while (val_num > win_residue) {
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dev_dbg(map->dev, "Writing window %d/%d\n",
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win_residue, val_len / map->format.val_bytes);
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ret = _regmap_raw_write(map, reg, val, win_residue *
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map->format.val_bytes);
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if (ret != 0)
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return ret;
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reg += win_residue;
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val_num -= win_residue;
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val += win_residue * map->format.val_bytes;
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val_len -= win_residue * map->format.val_bytes;
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win_offset = (reg - range->range_min) %
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range->window_len;
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win_residue = range->window_len - win_offset;
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}
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ret = _regmap_select_page(map, ®, range, val_num);
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if (ret != 0)
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if (ret != 0)
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return ret;
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return ret;
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}
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}
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