From patchwork Tue Jan 31 21:02:28 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Paul Cercueil X-Patchwork-Id: 13123458 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 567D8C636CD for ; Tue, 31 Jan 2023 21:02:43 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231865AbjAaVCm (ORCPT ); Tue, 31 Jan 2023 16:02:42 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:36666 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231527AbjAaVCl (ORCPT ); Tue, 31 Jan 2023 16:02:41 -0500 Received: from aposti.net (aposti.net [89.234.176.197]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 32F6010CA; Tue, 31 Jan 2023 13:02:39 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=crapouillou.net; s=mail; t=1675198956; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-transfer-encoding:content-transfer-encoding: in-reply-to:references; bh=4cfcgyV3aGGoH7bkT08YeGcbkBQEHVw7y75FoDFtFug=; b=gmkm7HQaVu5zsURDq0L1yTEtMxxqPBeTqvJRLNLATyCSpS4AsarbmrsmaV3P0993HqzKQP yIB5M2CtpQ3aI+ksGKlfrJAt8yC1p/lA/UH19E95vVLi20MhYyXrJ+HeusdqlO0Xvacv3e pPDjCQbQbLE0yQeGpUGmFykPL2SH1fo= From: Paul Cercueil To: Ulf Hansson Cc: linux-mips@vger.kernel.org, linux-mmc@vger.kernel.org, linux-kernel@vger.kernel.org, list@opendingux.net, Paul Cercueil Subject: [PATCH 1/2] mmc: jz4740: Work around bug on JZ4760(B) Date: Tue, 31 Jan 2023 21:02:28 +0000 Message-Id: <20230131210229.68129-1-paul@crapouillou.net> MIME-Version: 1.0 X-Spam: Yes Precedence: bulk List-ID: X-Mailing-List: linux-mmc@vger.kernel.org On JZ4760 and JZ4760B, SD cards fail to run if the maximum clock rate is set to 50 MHz, even though the controller officially does support it. Until the actual bug is found and fixed, limit the maximum clock rate to 24 MHz. Signed-off-by: Paul Cercueil --- drivers/mmc/host/jz4740_mmc.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/drivers/mmc/host/jz4740_mmc.c b/drivers/mmc/host/jz4740_mmc.c index 319a2a79c9a0..eb8e9607b086 100644 --- a/drivers/mmc/host/jz4740_mmc.c +++ b/drivers/mmc/host/jz4740_mmc.c @@ -1104,6 +1104,16 @@ static int jz4740_mmc_probe(struct platform_device* pdev) mmc->ops = &jz4740_mmc_ops; if (!mmc->f_max) mmc->f_max = JZ_MMC_CLK_RATE; + + /* + * There seems to be a problem with this driver on the JZ4760 and + * JZ4760B SoCs. There, when using the maximum rate supported (50 MHz), + * the communication fails with many SD cards. + * Until this bug is sorted out, limit the maximum rate to 24 MHz. + */ + if (host->version == JZ_MMC_JZ4760 && mmc->f_max > JZ_MMC_CLK_RATE) + mmc->f_max = JZ_MMC_CLK_RATE; + mmc->f_min = mmc->f_max / 128; mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34; From patchwork Tue Jan 31 21:02:29 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Paul Cercueil X-Patchwork-Id: 13123459 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 40FD2C38142 for ; Tue, 31 Jan 2023 21:02:53 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231911AbjAaVCw (ORCPT ); Tue, 31 Jan 2023 16:02:52 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:36820 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231932AbjAaVCt (ORCPT ); Tue, 31 Jan 2023 16:02:49 -0500 Received: from aposti.net (aposti.net [89.234.176.197]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E91717EE7; Tue, 31 Jan 2023 13:02:46 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=crapouillou.net; s=mail; t=1675198956; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=pTB/5ibjHKW2X7UZeS7Tcf9Oq/nbjX1Dx/72F1/KHz4=; b=2PhimR52P1QRmXzxXOkrgO2hnI+46M09JfZ//TwpNtjgjJgGEmQuQb/JyCokV6UzchP1C7 7GEGJ2DEaUCSrji9K1qK3egUnUKUZWew3h0Styiw0zkAwPhgyHtqlmbQo8g/bMUIzqm6Em JMU1rXaoXPul/jOGjZ0oGodHOH2wdkY= From: Paul Cercueil To: Ulf Hansson Cc: linux-mips@vger.kernel.org, linux-mmc@vger.kernel.org, linux-kernel@vger.kernel.org, list@opendingux.net, Paul Cercueil Subject: [PATCH 2/2] mmc: jz4740: Add support for vqmmc power supply Date: Tue, 31 Jan 2023 21:02:29 +0000 Message-Id: <20230131210229.68129-2-paul@crapouillou.net> In-Reply-To: <20230131210229.68129-1-paul@crapouillou.net> References: <20230131210229.68129-1-paul@crapouillou.net> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-mmc@vger.kernel.org Support enabling / disabling the vqmmc power supply if it was provided by the firmware. Provide the .start_signal_voltage_switch callback to change the voltage of the external vqmmc power supply. Signed-off-by: Paul Cercueil --- drivers/mmc/host/jz4740_mmc.c | 38 ++++++++++++++++++++++++++++++++++- 1 file changed, 37 insertions(+), 1 deletion(-) diff --git a/drivers/mmc/host/jz4740_mmc.c b/drivers/mmc/host/jz4740_mmc.c index eb8e9607b086..ccd2c3aed0f0 100644 --- a/drivers/mmc/host/jz4740_mmc.c +++ b/drivers/mmc/host/jz4740_mmc.c @@ -21,6 +21,7 @@ #include #include #include +#include #include #include @@ -162,6 +163,8 @@ struct jz4740_mmc_host { struct mmc_request *req; struct mmc_command *cmd; + bool vqmmc_enabled; + unsigned long waiting; uint32_t cmdat; @@ -943,6 +946,8 @@ static void jz4740_mmc_request(struct mmc_host *mmc, struct mmc_request *req) static void jz4740_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) { struct jz4740_mmc_host *host = mmc_priv(mmc); + int ret; + if (ios->clock) jz4740_mmc_set_clock_rate(host, ios->clock); @@ -955,12 +960,25 @@ static void jz4740_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) clk_prepare_enable(host->clk); break; case MMC_POWER_ON: + if (!IS_ERR(mmc->supply.vqmmc) && !host->vqmmc_enabled) { + ret = regulator_enable(mmc->supply.vqmmc); + if (ret) + dev_err(&host->pdev->dev, "Failed to set vqmmc power!\n"); + else + host->vqmmc_enabled = true; + } break; - default: + case MMC_POWER_OFF: if (!IS_ERR(mmc->supply.vmmc)) mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, 0); + if (!IS_ERR(mmc->supply.vqmmc) && host->vqmmc_enabled) { + regulator_disable(mmc->supply.vqmmc); + host->vqmmc_enabled = false; + } clk_disable_unprepare(host->clk); break; + default: + break; } switch (ios->bus_width) { @@ -986,6 +1004,23 @@ static void jz4740_mmc_enable_sdio_irq(struct mmc_host *mmc, int enable) jz4740_mmc_set_irq_enabled(host, JZ_MMC_IRQ_SDIO, enable); } +static int jz4740_voltage_switch(struct mmc_host *mmc, struct mmc_ios *ios) +{ + int ret; + + /* vqmmc regulator is available */ + if (!IS_ERR(mmc->supply.vqmmc)) { + ret = mmc_regulator_set_vqmmc(mmc, ios); + return ret < 0 ? ret : 0; + } + + /* no vqmmc regulator, assume fixed regulator at 3/3.3V */ + if (ios->signal_voltage == MMC_SIGNAL_VOLTAGE_330) + return 0; + + return -EINVAL; +} + static const struct mmc_host_ops jz4740_mmc_ops = { .request = jz4740_mmc_request, .pre_req = jz4740_mmc_pre_request, @@ -994,6 +1029,7 @@ static const struct mmc_host_ops jz4740_mmc_ops = { .get_ro = mmc_gpio_get_ro, .get_cd = mmc_gpio_get_cd, .enable_sdio_irq = jz4740_mmc_enable_sdio_irq, + .start_signal_voltage_switch = jz4740_voltage_switch, }; static inline struct jz4740_mmc_host *