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Mon, 17 Jul 2023 22:33:17 +0200 (CEST) DKIM-Filter: OpenDKIM Filter v2.11.0 alsa1.perex.cz DCED6F8027B Authentication-Results: alsa1.perex.cz; dkim=pass (2048-bit key, unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20201202 header.b=dfbHZzBN Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 3F92261233; Mon, 17 Jul 2023 20:33:16 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 12199C433C7; Mon, 17 Jul 2023 20:33:13 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1689625995; bh=asnEKCSLQS/uNfyRgYl+ksnbJzzBRAv8Ur+NiRrtqSE=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=dfbHZzBNjmAh2GPJQXl4+PaLzVLBTGWLswICTnQVJW216Oo8KlI66DrLdViLmyf2C 9rK28bfTGMx4Q0OHIrus77fko1PutrcwiMIHF41ViglSealy8zAZgcAwvU3SnTewYc oynzCKz+H5BOCykQKioEVO8XQlr6ea6iOYeG8yeFCCSUtoaWHfnZYYAzMpldeu/5Fd sPcKYDeBugl4TJ0gadfrRYF9R0wMV2mu822lsNUEbgr8dvQPF3RD39KWkCeriq7sU6 2o/nO4NJQCSZ2LUcDVwOlVZPDyzep9NAdPclZDWYNki1And5yKrvoTOUWjZHu9l683 g2XEA7uVOyktw== From: Mark Brown Date: Mon, 17 Jul 2023 21:33:03 +0100 Subject: [PATCH 1/3] regmap: Let users check if a register is cached MIME-Version: 1.0 Message-Id: <20230717-regmap-cache-check-v1-1-73ef688afae3@kernel.org> References: <20230717-regmap-cache-check-v1-0-73ef688afae3@kernel.org> In-Reply-To: <20230717-regmap-cache-check-v1-0-73ef688afae3@kernel.org> To: Jaroslav Kysela , Takashi Iwai Cc: alsa-devel@alsa-project.org, linux-kernel@vger.kernel.org, Mark Brown X-Mailer: b4 0.13-dev-099c9 X-Developer-Signature: v=1; a=openpgp-sha256; l=1894; i=broonie@kernel.org; h=from:subject:message-id; bh=asnEKCSLQS/uNfyRgYl+ksnbJzzBRAv8Ur+NiRrtqSE=; b=owEBbQGS/pANAwAKASTWi3JdVIfQAcsmYgBktaWFmLfcJep5LqvVZiSrYHrXWYcDXZnPESyRi cO5BUNFXQKJATMEAAEKAB0WIQSt5miqZ1cYtZ/in+ok1otyXVSH0AUCZLWlhQAKCRAk1otyXVSH 0IDsCACCdkNOcaAD2yxTysnsoFA5Go65pphKHCRH16FNb9l77a994IjWeN6pqJb/HoIhCx4v8qm NV9os3vvsXgvzc++6x42Fe0DnYKdlF4FWccBqddxjdYtGKxQFocxz6QxfDJMApOrf8jjgBQ2Lga LrrOASaENXQfKC1M7W/+MBpzvLhEzXi3Zlm9rtoGNce3EFxYe4XZBCWkT6LHlF/ggLDMk+4PjUo b5aVLhhWfO0rLd0ZodVPjM7S3IWWjsahQC0HiTZQB7QhVowINFH3+DFd7HjAPBQvLM/aQvw9lRx SR2v3OItdm7tkpng4SgeDNv76HdCJQIYiaYP0T5+q2VHcx5z X-Developer-Key: i=broonie@kernel.org; a=openpgp; fpr=3F2568AAC26998F9E813A1C5C3F436CA30F5D8EB Message-ID-Hash: EEDYM2UHAHB3VAEANGJNH536QL252LGW X-Message-ID-Hash: EEDYM2UHAHB3VAEANGJNH536QL252LGW X-MailFrom: broonie@kernel.org X-Mailman-Rule-Misses: dmarc-mitigation; no-senders; approved; emergency; loop; banned-address; member-moderation; header-match-alsa-devel.alsa-project.org-0; header-match-alsa-devel.alsa-project.org-1; nonmember-moderation; administrivia; implicit-dest; max-recipients; max-size; news-moderation; no-subject; digests; suspicious-header X-Mailman-Version: 3.3.8 Precedence: list List-Id: "Alsa-devel mailing list for ALSA developers - http://www.alsa-project.org" Archived-At: List-Archive: List-Help: List-Owner: List-Post: List-Subscribe: List-Unsubscribe: The HDA driver has a use case for checking if a register is cached which it bodges in awkwardly and unclearly. Provide an API which allows it to directly do what it's trying to do. Signed-off-by: Mark Brown --- drivers/base/regmap/regcache.c | 23 +++++++++++++++++++++++ include/linux/regmap.h | 1 + 2 files changed, 24 insertions(+) diff --git a/drivers/base/regmap/regcache.c b/drivers/base/regmap/regcache.c index 28bc3ae9458a..4d25a906b688 100644 --- a/drivers/base/regmap/regcache.c +++ b/drivers/base/regmap/regcache.c @@ -561,6 +561,29 @@ void regcache_cache_bypass(struct regmap *map, bool enable) } EXPORT_SYMBOL_GPL(regcache_cache_bypass); +/** + * regcache_reg_cached - Check if a register is cached + * + * @map: map to check + * @reg: register to check + * + * Reports if a register is cached. + */ +bool regcache_reg_cached(struct regmap *map, unsigned int reg) +{ + unsigned int val; + int ret; + + map->lock(map->lock_arg); + + ret = regcache_read(map, reg, &val); + + map->unlock(map->lock_arg); + + return ret == 0; +} +EXPORT_SYMBOL_GPL(regcache_reg_cached); + void regcache_set_val(struct regmap *map, void *base, unsigned int idx, unsigned int val) { diff --git a/include/linux/regmap.h b/include/linux/regmap.h index 8fc0b3ebce44..c9182a47736e 100644 --- a/include/linux/regmap.h +++ b/include/linux/regmap.h @@ -1287,6 +1287,7 @@ int regcache_drop_region(struct regmap *map, unsigned int min, void regcache_cache_only(struct regmap *map, bool enable); void regcache_cache_bypass(struct regmap *map, bool enable); void regcache_mark_dirty(struct regmap *map); +bool regcache_reg_cached(struct regmap *map, unsigned int reg); bool regmap_check_range_table(struct regmap *map, unsigned int reg, const struct regmap_access_table *table);