From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-19.4 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 81CBAC2B9FB for ; Wed, 12 May 2021 16:42:36 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 4CBFE611AC for ; Wed, 12 May 2021 16:42:36 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232350AbhELQnX (ORCPT ); Wed, 12 May 2021 12:43:23 -0400 Received: from mail.kernel.org ([198.145.29.99]:57028 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S242893AbhELQgF (ORCPT ); Wed, 12 May 2021 12:36:05 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id E64A961E0D; Wed, 12 May 2021 16:00:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1620835205; bh=tEbSSCKTpS1KFdelxLTU1zusNTkuyQfPNiWp7MITfKI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=HlFk5tC1gdE7nuwRr+7kjp/C8fU67xe5Nz0Bix7EweRVi9a5mvn1o9DELn6mi1tmd SA2bDzd6o03Og8xGE3pJTMV52gbvknXziKPjuoS8Mcoa3Ra0xnNtwzIYndE93r8f1S OYBSu1gOqJqCi9AzJPi8VZiU3PEM/Lw8p0biHyyM= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Douglas Anderson , Ravi Kumar Bokka , Srinivas Kandagatla , Sasha Levin Subject: [PATCH 5.12 250/677] drivers: nvmem: Fix voltage settings for QTI qfprom-efuse Date: Wed, 12 May 2021 16:44:56 +0200 Message-Id: <20210512144845.537765648@linuxfoundation.org> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210512144837.204217980@linuxfoundation.org> References: <20210512144837.204217980@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Ravi Kumar Bokka [ Upstream commit 9ec4f4b0e9fd3ad4b9a38bddb75b516ea09f4628 ] QFPROM controller hardware requires 1.8V min for fuse blowing. So, this change sets the voltage to 1.8V, required to blow the fuse for qfprom-efuse controller. To disable fuse blowing, we set the voltage to 0V since this may be a shared rail and may be able to run at a lower rate when we're not blowing fuses. Fixes: 93b4e49f8c86 ("nvmem: qfprom: Add fuse blowing support") Reported-by: Douglas Anderson Suggested-by: Douglas Anderson Reviewed-by: Douglas Anderson Signed-off-by: Ravi Kumar Bokka Signed-off-by: Srinivas Kandagatla Link: https://lore.kernel.org/r/20210330111241.19401-4-srinivas.kandagatla@linaro.org Signed-off-by: Greg Kroah-Hartman Signed-off-by: Sasha Levin --- drivers/nvmem/qfprom.c | 21 +++++++++++++++++++++ 1 file changed, 21 insertions(+) diff --git a/drivers/nvmem/qfprom.c b/drivers/nvmem/qfprom.c index 6cace24dfbf7..100d69d8f2e1 100644 --- a/drivers/nvmem/qfprom.c +++ b/drivers/nvmem/qfprom.c @@ -127,6 +127,16 @@ static void qfprom_disable_fuse_blowing(const struct qfprom_priv *priv, { int ret; + /* + * This may be a shared rail and may be able to run at a lower rate + * when we're not blowing fuses. At the moment, the regulator framework + * applies voltage constraints even on disabled rails, so remove our + * constraints and allow the rail to be adjusted by other users. + */ + ret = regulator_set_voltage(priv->vcc, 0, INT_MAX); + if (ret) + dev_warn(priv->dev, "Failed to set 0 voltage (ignoring)\n"); + ret = regulator_disable(priv->vcc); if (ret) dev_warn(priv->dev, "Failed to disable regulator (ignoring)\n"); @@ -172,6 +182,17 @@ static int qfprom_enable_fuse_blowing(const struct qfprom_priv *priv, goto err_clk_prepared; } + /* + * Hardware requires 1.8V min for fuse blowing; this may be + * a rail shared do don't specify a max--regulator constraints + * will handle. + */ + ret = regulator_set_voltage(priv->vcc, 1800000, INT_MAX); + if (ret) { + dev_err(priv->dev, "Failed to set 1.8 voltage\n"); + goto err_clk_rate_set; + } + ret = regulator_enable(priv->vcc); if (ret) { dev_err(priv->dev, "Failed to enable regulator\n"); -- 2.30.2