5.4-stable review patch. If anyone has any objections, please let me know.
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From: Ben Wolsieffer ben.wolsieffer@hefring.com
[ Upstream commit 984a4afdc87a1fc226fd657b1cd8255c13d3fc1a ]
Currently, noinc writes are cached as if they were standard incrementing writes, overwriting unrelated register values in the cache. Instead, we want to cache the last value written to the register, as is done in the accelerated noinc handler (regmap_noinc_readwrite).
Fixes: cdf6b11daa77 ("regmap: Add regmap_noinc_write API") Signed-off-by: Ben Wolsieffer ben.wolsieffer@hefring.com Link: https://lore.kernel.org/r/20231101142926.2722603-2-ben.wolsieffer@hefring.co... Signed-off-by: Mark Brown broonie@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/base/regmap/regmap.c | 16 +++++++++------- 1 file changed, 9 insertions(+), 7 deletions(-)
diff --git a/drivers/base/regmap/regmap.c b/drivers/base/regmap/regmap.c index b5974cbbe78f6..23574c328616f 100644 --- a/drivers/base/regmap/regmap.c +++ b/drivers/base/regmap/regmap.c @@ -1495,17 +1495,19 @@ static int _regmap_raw_write_impl(struct regmap *map, unsigned int reg, }
if (!map->cache_bypass && map->format.parse_val) { - unsigned int ival; + unsigned int ival, offset; int val_bytes = map->format.val_bytes; - for (i = 0; i < val_len / val_bytes; i++) { - ival = map->format.parse_val(val + (i * val_bytes)); - ret = regcache_write(map, - reg + regmap_get_offset(map, i), - ival); + + /* Cache the last written value for noinc writes */ + i = noinc ? val_len - val_bytes : 0; + for (; i < val_len; i += val_bytes) { + ival = map->format.parse_val(val + i); + offset = noinc ? 0 : regmap_get_offset(map, i / val_bytes); + ret = regcache_write(map, reg + offset, ival); if (ret) { dev_err(map->dev, "Error in caching of register: %x ret: %d\n", - reg + regmap_get_offset(map, i), ret); + reg + offset, ret); return ret; } }