Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753598AbbDAN1l (ORCPT ); Wed, 1 Apr 2015 09:27:41 -0400 Received: from opensource.wolfsonmicro.com ([80.75.67.52]:40105 "EHLO opensource.wolfsonmicro.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751738AbbDAN1f (ORCPT ); Wed, 1 Apr 2015 09:27:35 -0400 From: Charles Keepax To: lee.jones@linaro.org Cc: sameo@linux.intel.com, broonie@kernel.org, lgirdwood@gmail.com, patches@opensource.wolfsonmicro.com, linux-kernel@vger.kernel.org Subject: [PATCH v4 2/4] mfd: wm5110: Add register patch required for low power sleep Date: Wed, 1 Apr 2015 14:22:58 +0100 Message-Id: <1427894580-27020-2-git-send-email-ckeepax@opensource.wolfsonmicro.com> X-Mailer: git-send-email 1.7.2.5 In-Reply-To: <1427894580-27020-1-git-send-email-ckeepax@opensource.wolfsonmicro.com> References: <1427894580-27020-1-git-send-email-ckeepax@opensource.wolfsonmicro.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2197 Lines: 80 Some register settings must be applied before the first time low power sleep mode is entered on the wm5110 to ensure optimium performance. These settings require SYSCLK to be enabled whilst they are being applied. This patch applies the settings using the recently factored out boot time SYSCLK functionality. Signed-off-by: Charles Keepax Acked-by: Lee Jones --- drivers/mfd/arizona-core.c | 42 ++++++++++++++++++++++++++++++++++++++++++ 1 files changed, 42 insertions(+), 0 deletions(-) diff --git a/drivers/mfd/arizona-core.c b/drivers/mfd/arizona-core.c index 13428cf..534d946 100644 --- a/drivers/mfd/arizona-core.c +++ b/drivers/mfd/arizona-core.c @@ -364,6 +364,38 @@ err: return ret ?: err; } +/* + * Register patch to some of the CODECs internal write sequences + * to ensure a clean exit from the low power sleep state. + */ +static const struct reg_default wm5110_sleep_patch[] = { + { 0x337A, 0xC100 }, + { 0x337B, 0x0041 }, + { 0x3300, 0xA210 }, + { 0x3301, 0x050C }, +}; + +static inline int wm5110_apply_sleep_patch(struct arizona *arizona) +{ + struct arizona_sysclk_state state; + int err, ret; + + ret = arizona_enable_freerun_sysclk(arizona, &state); + if (ret) + return ret; + + ret = regmap_multi_reg_write_bypassed(arizona->regmap, + wm5110_sleep_patch, + ARRAY_SIZE(wm5110_sleep_patch)); + + err = arizona_disable_freerun_sysclk(arizona, &state); + + if (ret) + return ret; + else + return err; +} + #ifdef CONFIG_PM static int arizona_runtime_resume(struct device *dev) { @@ -933,6 +965,16 @@ int arizona_dev_init(struct arizona *arizona) goto err_reset; } break; + case WM5110: + case WM8280: + ret = wm5110_apply_sleep_patch(arizona); + if (ret) { + dev_err(arizona->dev, + "Failed to apply sleep patch: %d\n", + ret); + goto err_reset; + } + break; default: break; } -- 1.7.2.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/