Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753562AbbDQItH (ORCPT ); Fri, 17 Apr 2015 04:49:07 -0400 Received: from opensource.wolfsonmicro.com ([80.75.67.52]:39112 "EHLO opensource.wolfsonmicro.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753481AbbDQItC (ORCPT ); Fri, 17 Apr 2015 04:49:02 -0400 From: Charles Keepax To: lee.jones@linaro.org Cc: broonie@kernel.org, sameo@linux.intel.com, linux-kernel@vger.kernel.org, lgirdwood@gmail.com, patches@opensource.wolfsonmicro.com Subject: [PATCH v2 5/9] mfd: wm5110: Add register patch required for low power sleep Date: Fri, 17 Apr 2015 09:42:22 +0100 Message-Id: <1429260146-16694-6-git-send-email-ckeepax@opensource.wolfsonmicro.com> X-Mailer: git-send-email 1.7.2.5 In-Reply-To: <1429260146-16694-1-git-send-email-ckeepax@opensource.wolfsonmicro.com> References: <1429260146-16694-1-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: 2165 Lines: 77 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 | 39 +++++++++++++++++++++++++++++++++++++++ 1 files changed, 39 insertions(+), 0 deletions(-) diff --git a/drivers/mfd/arizona-core.c b/drivers/mfd/arizona-core.c index f1d9ef0..36dbf46 100644 --- a/drivers/mfd/arizona-core.c +++ b/drivers/mfd/arizona-core.c @@ -378,6 +378,35 @@ 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 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); + + return ret ?: err; +} + static int wm5102_clear_write_sequencer(struct arizona *arizona) { int ret; @@ -974,6 +1003,16 @@ 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/