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Koen Kooi
ebbeb55561
Also add script used to generate patches and SRC_URI Signed-off-by: Koen Kooi <koen@dominion.thruhere.net> Signed-off-by: Denys Dmytriyenko <denys@ti.com>
54 lines
2.2 KiB
Diff
54 lines
2.2 KiB
Diff
From 8aff5c7aa69b29b924063b4424cf5ff5823b3fd1 Mon Sep 17 00:00:00 2001
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From: Lars-Peter Clausen <lars@metafoo.de>
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Date: Wed, 15 Feb 2012 10:23:25 +0100
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Subject: [PATCH 08/72] regmap: Fix cache defaults initialization from raw
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cache defaults
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commit 61cddc57dc14a5dffa0921d9a24fd68edbb374ac upstream.
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Currently registers with a value of 0 are ignored when initializing the register
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defaults from raw defaults. This worked in the past, because registers without a
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explicit default were assumed to have a default value of 0. This was changed in
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commit b03622a8 ("regmap: Ensure rbtree syncs registers set to zero properly").
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As a result registers, which have a raw default value of 0 are now assumed to
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have no default. This again can result in unnecessary writes when syncing the
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cache. It will also result in unnecessary reads for e.g. the first update
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operation. In the case where readback is not possible this will even let the
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update operation fail, if the register has not been written to before.
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So this patch removes the check. Instead it adds a check to ignore raw defaults
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for registers which are volatile, since those registers are not cached.
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Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
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Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
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Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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---
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drivers/base/regmap/regcache.c | 4 ++--
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1 file changed, 2 insertions(+), 2 deletions(-)
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diff --git a/drivers/base/regmap/regcache.c b/drivers/base/regmap/regcache.c
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index 666f6f5..64004b0 100644
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--- a/drivers/base/regmap/regcache.c
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+++ b/drivers/base/regmap/regcache.c
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@@ -54,7 +54,7 @@ static int regcache_hw_init(struct regmap *map)
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for (count = 0, i = 0; i < map->num_reg_defaults_raw; i++) {
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val = regcache_get_val(map->reg_defaults_raw,
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i, map->cache_word_size);
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- if (!val)
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+ if (regmap_volatile(map, i))
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continue;
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count++;
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}
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@@ -69,7 +69,7 @@ static int regcache_hw_init(struct regmap *map)
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for (i = 0, j = 0; i < map->num_reg_defaults_raw; i++) {
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val = regcache_get_val(map->reg_defaults_raw,
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i, map->cache_word_size);
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- if (!val)
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+ if (regmap_volatile(map, i))
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continue;
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map->reg_defaults[j].reg = i;
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map->reg_defaults[j].def = val;
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--
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1.7.9.4
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