From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752712Ab1IWGup (ORCPT ); Fri, 23 Sep 2011 02:50:45 -0400 Received: from na3sys009aog118.obsmtp.com ([74.125.149.244]:40280 "EHLO na3sys009aog118.obsmtp.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751981Ab1IWGuQ (ORCPT ); Fri, 23 Sep 2011 02:50:16 -0400 From: Peter Ujfalusi To: Samuel Ortiz , Dmitry Torokhov , Mark Brown , Liam Girdwood Cc: alsa-devel@alsa-project.org, linux-kernel@vger.kernel.org, Misael Lopez Cruz , linux-input@vger.kernel.org Subject: [PATCH v2 2/6] MFD: twl6040: Cache the vibra control registers Date: Fri, 23 Sep 2011 09:49:40 +0300 Message-Id: <1316760584-27426-3-git-send-email-peter.ujfalusi@ti.com> X-Mailer: git-send-email 1.7.6.1 In-Reply-To: <1316760584-27426-1-git-send-email-peter.ujfalusi@ti.com> References: <1316760584-27426-1-git-send-email-peter.ujfalusi@ti.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The vibra control register will be used from the ASoC codec driver as well. In order to avoid latency issues caused by I2C read access, cache the two control register within the core driver, so we do not need to reach out to the chip to read it back. Signed-off-by: Peter Ujfalusi --- drivers/mfd/twl6040-core.c | 19 +++++++++++++++---- include/linux/mfd/twl6040.h | 1 + 2 files changed, 16 insertions(+), 4 deletions(-) diff --git a/drivers/mfd/twl6040-core.c b/drivers/mfd/twl6040-core.c index 7dc8c47..75987c8 100644 --- a/drivers/mfd/twl6040-core.c +++ b/drivers/mfd/twl6040-core.c @@ -34,16 +34,24 @@ #include #include +#define VIBRACTRL_MEMBER(reg) ((reg == TWL6040_REG_VIBCTLL) ? 0 : 1) + int twl6040_reg_read(struct twl6040 *twl6040, unsigned int reg) { int ret; u8 val = 0; mutex_lock(&twl6040->io_mutex); - ret = twl_i2c_read_u8(TWL_MODULE_AUDIO_VOICE, &val, reg); - if (ret < 0) { - mutex_unlock(&twl6040->io_mutex); - return ret; + /* Vibra control registers from cache */ + if (unlikely(reg == TWL6040_REG_VIBCTLL || + reg == TWL6040_REG_VIBCTLR)) { + val = twl6040->vibra_ctrl_cache[VIBRACTRL_MEMBER(reg)]; + } else { + ret = twl_i2c_read_u8(TWL_MODULE_AUDIO_VOICE, &val, reg); + if (ret < 0) { + mutex_unlock(&twl6040->io_mutex); + return ret; + } } mutex_unlock(&twl6040->io_mutex); @@ -57,6 +65,9 @@ int twl6040_reg_write(struct twl6040 *twl6040, unsigned int reg, u8 val) mutex_lock(&twl6040->io_mutex); ret = twl_i2c_write_u8(TWL_MODULE_AUDIO_VOICE, val, reg); + /* Cache the vibra control registers */ + if (reg == TWL6040_REG_VIBCTLL || reg == TWL6040_REG_VIBCTLR) + twl6040->vibra_ctrl_cache[VIBRACTRL_MEMBER(reg)] = val; mutex_unlock(&twl6040->io_mutex); return ret; diff --git a/include/linux/mfd/twl6040.h b/include/linux/mfd/twl6040.h index e6c755d..2f8585a 100644 --- a/include/linux/mfd/twl6040.h +++ b/include/linux/mfd/twl6040.h @@ -184,6 +184,7 @@ struct twl6040 { int audpwron; int power_count; int rev; + u8 vibra_ctrl_cache[2]; int pll; unsigned int sysclk; -- 1.7.6.1