From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756849Ab2BWUMj (ORCPT ); Thu, 23 Feb 2012 15:12:39 -0500 Received: from opensource.wolfsonmicro.com ([80.75.67.52]:38074 "EHLO opensource.wolfsonmicro.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756012Ab2BWUMi (ORCPT ); Thu, 23 Feb 2012 15:12:38 -0500 From: Mark Brown To: linux-kernel@vger.kernel.org Cc: patches@opensource.wolfsonmicro.com, Mark Brown Subject: [PATCH] regmap: Skip hardware defaults for LZO caches Date: Thu, 23 Feb 2012 20:12:34 +0000 Message-Id: <1330027955-30651-1-git-send-email-broonie@opensource.wolfsonmicro.com> X-Mailer: git-send-email 1.7.9.1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Saves some I/O when resyncing; we assume that syncs start from the device reset state. Signed-off-by: Mark Brown --- drivers/base/regmap/regcache-lzo.c | 6 ++++++ 1 files changed, 6 insertions(+), 0 deletions(-) diff --git a/drivers/base/regmap/regcache-lzo.c b/drivers/base/regmap/regcache-lzo.c index 5e964e9..77dc532 100644 --- a/drivers/base/regmap/regcache-lzo.c +++ b/drivers/base/regmap/regcache-lzo.c @@ -349,6 +349,12 @@ static int regcache_lzo_sync(struct regmap *map, unsigned int min, ret = regcache_read(map, i, &val); if (ret) return ret; + + /* Is this the hardware default? If so skip. */ + ret = regcache_lookup_reg(map, i); + if (ret > 0 && val == map->reg_defaults[ret].def) + continue; + map->cache_bypass = 1; ret = _regmap_write(map, i, val); map->cache_bypass = 0; -- 1.7.9.1