From patchwork Tue Sep 21 11:00:25 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tony Lindgren X-Patchwork-Id: 12507611 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=-16.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable 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 2E21FC4332F for ; Tue, 21 Sep 2021 11:00:37 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 1451D61175 for ; Tue, 21 Sep 2021 11:00:37 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232173AbhIULCE (ORCPT ); Tue, 21 Sep 2021 07:02:04 -0400 Received: from muru.com ([72.249.23.125]:35624 "EHLO muru.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232249AbhIULCD (ORCPT ); Tue, 21 Sep 2021 07:02:03 -0400 Received: from hillo.muru.com (localhost [127.0.0.1]) by muru.com (Postfix) with ESMTP id CB6A38127; Tue, 21 Sep 2021 11:01:01 +0000 (UTC) From: Tony Lindgren To: Ulf Hansson Cc: Adrian Hunter , Chunyan Zhang , Faiz Abbas , Kishon Vijay Abraham I , Santosh Shilimkar , linux-mmc@vger.kernel.org, linux-omap@vger.kernel.org Subject: [PATCH 1/5] mmc: sdhci-omap: Fix NULL pointer exception if regulator is not configured Date: Tue, 21 Sep 2021 14:00:25 +0300 Message-Id: <20210921110029.21944-2-tony@atomide.com> X-Mailer: git-send-email 2.33.0 In-Reply-To: <20210921110029.21944-1-tony@atomide.com> References: <20210921110029.21944-1-tony@atomide.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-omap@vger.kernel.org If sdhci-omap is configured for an unused device instance and the device is not set as disabled, we can get a NULL pointer dereference: Unable to handle kernel NULL pointer dereference at virtual address 00000045 ... (regulator_set_voltage) from [] (mmc_regulator_set_ocr+0x44/0xd0) (mmc_regulator_set_ocr) from [] (sdhci_set_ios+0xa4/0x490) (sdhci_set_ios) from [] (sdhci_omap_set_ios+0x124/0x160) (sdhci_omap_set_ios) from [] (mmc_power_up.part.0+0x3c/0x154) (mmc_power_up.part.0) from [] (mmc_start_host+0x88/0x9c) (mmc_start_host) from [] (mmc_add_host+0x58/0x7c) (mmc_add_host) from [] (__sdhci_add_host+0xf0/0x22c) (__sdhci_add_host) from [] (sdhci_omap_probe+0x318/0x72c) (sdhci_omap_probe) from [] (platform_probe+0x58/0xb8) AFAIK we are not seeing this with the devices configured in the mainline kernel but this can cause issues for folks bringing up their boards. Fixes: 7d326930d352 ("mmc: sdhci-omap: Add OMAP SDHCI driver") Signed-off-by: Tony Lindgren --- drivers/mmc/host/sdhci-omap.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/mmc/host/sdhci-omap.c b/drivers/mmc/host/sdhci-omap.c --- a/drivers/mmc/host/sdhci-omap.c +++ b/drivers/mmc/host/sdhci-omap.c @@ -682,7 +682,8 @@ static void sdhci_omap_set_power(struct sdhci_host *host, unsigned char mode, { struct mmc_host *mmc = host->mmc; - mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, vdd); + if (!IS_ERR(mmc->supply.vmmc)) + mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, vdd); } static int sdhci_omap_enable_dma(struct sdhci_host *host) From patchwork Tue Sep 21 11:00:26 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tony Lindgren X-Patchwork-Id: 12507613 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=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable 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 017B8C433F5 for ; Tue, 21 Sep 2021 11:00:43 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id DD3EC6115A for ; Tue, 21 Sep 2021 11:00:42 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232266AbhIULCF (ORCPT ); Tue, 21 Sep 2021 07:02:05 -0400 Received: from muru.com ([72.249.23.125]:35632 "EHLO muru.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232249AbhIULCF (ORCPT ); Tue, 21 Sep 2021 07:02:05 -0400 Received: from hillo.muru.com (localhost [127.0.0.1]) by muru.com (Postfix) with ESMTP id A4BC680A8; Tue, 21 Sep 2021 11:01:03 +0000 (UTC) From: Tony Lindgren To: Ulf Hansson Cc: Adrian Hunter , Chunyan Zhang , Faiz Abbas , Kishon Vijay Abraham I , Santosh Shilimkar , linux-mmc@vger.kernel.org, linux-omap@vger.kernel.org Subject: [PATCH 2/5] mmc: sdhci-omap: Fix context restore Date: Tue, 21 Sep 2021 14:00:26 +0300 Message-Id: <20210921110029.21944-3-tony@atomide.com> X-Mailer: git-send-email 2.33.0 In-Reply-To: <20210921110029.21944-1-tony@atomide.com> References: <20210921110029.21944-1-tony@atomide.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-omap@vger.kernel.org We need to restore context in a specified order with HCTL set in two phases. This is similar to what omap_hsmmc_context_restore() is doing. Otherwise SDIO can stop working on resume. And for PM runtime and SDIO cards, we need to also save SYSCTL, IE and ISE. This should not be a problem currently, and these patches can be applied whenever suitable. Fixes: ee0f309263a6 ("mmc: sdhci-omap: Add Support for Suspend/Resume") Signed-off-by: Tony Lindgren --- drivers/mmc/host/sdhci-omap.c | 15 ++++++++++++++- 1 file changed, 14 insertions(+), 1 deletion(-) diff --git a/drivers/mmc/host/sdhci-omap.c b/drivers/mmc/host/sdhci-omap.c --- a/drivers/mmc/host/sdhci-omap.c +++ b/drivers/mmc/host/sdhci-omap.c @@ -62,6 +62,8 @@ #define SDHCI_OMAP_IE 0x234 #define INT_CC_EN BIT(0) +#define SDHCI_OMAP_ISE 0x238 + #define SDHCI_OMAP_AC12 0x23c #define AC12_V1V8_SIGEN BIT(19) #define AC12_SCLK_SEL BIT(23) @@ -113,6 +115,8 @@ struct sdhci_omap_host { u32 hctl; u32 sysctl; u32 capa; + u32 ie; + u32 ise; }; static void sdhci_omap_start_clock(struct sdhci_omap_host *omap_host); @@ -1245,14 +1249,23 @@ static void sdhci_omap_context_save(struct sdhci_omap_host *omap_host) { omap_host->con = sdhci_omap_readl(omap_host, SDHCI_OMAP_CON); omap_host->hctl = sdhci_omap_readl(omap_host, SDHCI_OMAP_HCTL); + omap_host->sysctl = sdhci_omap_readl(omap_host, SDHCI_OMAP_SYSCTL); omap_host->capa = sdhci_omap_readl(omap_host, SDHCI_OMAP_CAPA); + omap_host->ie = sdhci_omap_readl(omap_host, SDHCI_OMAP_IE); + omap_host->ise = sdhci_omap_readl(omap_host, SDHCI_OMAP_ISE); } +/* Order matters here, HCTL must be restored in two phases */ static void sdhci_omap_context_restore(struct sdhci_omap_host *omap_host) { - sdhci_omap_writel(omap_host, SDHCI_OMAP_CON, omap_host->con); sdhci_omap_writel(omap_host, SDHCI_OMAP_HCTL, omap_host->hctl); sdhci_omap_writel(omap_host, SDHCI_OMAP_CAPA, omap_host->capa); + sdhci_omap_writel(omap_host, SDHCI_OMAP_HCTL, omap_host->hctl); + + sdhci_omap_writel(omap_host, SDHCI_OMAP_SYSCTL, omap_host->sysctl); + sdhci_omap_writel(omap_host, SDHCI_OMAP_CON, omap_host->con); + sdhci_omap_writel(omap_host, SDHCI_OMAP_IE, omap_host->ie); + sdhci_omap_writel(omap_host, SDHCI_OMAP_ISE, omap_host->ise); } static int __maybe_unused sdhci_omap_suspend(struct device *dev) From patchwork Tue Sep 21 11:00:27 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tony Lindgren X-Patchwork-Id: 12507615 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=-16.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable 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 B9AA2C4332F for ; Tue, 21 Sep 2021 11:00:43 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A90E061178 for ; Tue, 21 Sep 2021 11:00:43 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232229AbhIULCK (ORCPT ); Tue, 21 Sep 2021 07:02:10 -0400 Received: from muru.com ([72.249.23.125]:35644 "EHLO muru.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232249AbhIULCH (ORCPT ); Tue, 21 Sep 2021 07:02:07 -0400 Received: from hillo.muru.com (localhost [127.0.0.1]) by muru.com (Postfix) with ESMTP id 9F4CD812F; Tue, 21 Sep 2021 11:01:05 +0000 (UTC) From: Tony Lindgren To: Ulf Hansson Cc: Adrian Hunter , Chunyan Zhang , Faiz Abbas , Kishon Vijay Abraham I , Santosh Shilimkar , linux-mmc@vger.kernel.org, linux-omap@vger.kernel.org Subject: [PATCH 3/5] mmc: sdhci-omap: Restore sysconfig after reset Date: Tue, 21 Sep 2021 14:00:27 +0300 Message-Id: <20210921110029.21944-4-tony@atomide.com> X-Mailer: git-send-email 2.33.0 In-Reply-To: <20210921110029.21944-1-tony@atomide.com> References: <20210921110029.21944-1-tony@atomide.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-omap@vger.kernel.org The sysconfig register is managed in a generic way by PM runtime for us by the interconnect target module layer code. SDHCI_RESET_ALL also resets the target module configuration, so we need to restore sysconfig after reset. Note that there is no need to save and restore sysconfig during PM runtime, the PM runtime layer will do that for us. Not sure if this issue is a problem with the current configurations, I noticed the issue while adding support for older TI SoCs and testing with wlcore SDIO wlan device. Signed-off-by: Tony Lindgren --- drivers/mmc/host/sdhci-omap.c | 14 +++++++++++++- 1 file changed, 13 insertions(+), 1 deletion(-) diff --git a/drivers/mmc/host/sdhci-omap.c b/drivers/mmc/host/sdhci-omap.c --- a/drivers/mmc/host/sdhci-omap.c +++ b/drivers/mmc/host/sdhci-omap.c @@ -21,6 +21,8 @@ #include "sdhci-pltfm.h" +#define SDHCI_OMAP_SYSCONFIG 0x110 + #define SDHCI_OMAP_CON 0x12c #define CON_DW8 BIT(5) #define CON_DMA_MASTER BIT(20) @@ -797,6 +799,11 @@ static void sdhci_omap_reset(struct sdhci_host *host, u8 mask) struct sdhci_omap_host *omap_host = sdhci_pltfm_priv(pltfm_host); unsigned long limit = MMC_TIMEOUT_US; unsigned long i = 0; + u32 sysc; + + /* Save target module sysconfig configured by SoC PM layer */ + if (mask & SDHCI_RESET_ALL) + sysc = sdhci_omap_readl(omap_host, SDHCI_OMAP_SYSCONFIG); /* Don't reset data lines during tuning operation */ if (omap_host->is_tuning) @@ -816,10 +823,15 @@ static void sdhci_omap_reset(struct sdhci_host *host, u8 mask) dev_err(mmc_dev(host->mmc), "Timeout waiting on controller reset in %s\n", __func__); - return; + + goto restore_sysc; } sdhci_reset(host, mask); + +restore_sysc: + if (mask & SDHCI_RESET_ALL) + sdhci_omap_writel(omap_host, SDHCI_OMAP_SYSCONFIG, sysc); } #define CMD_ERR_MASK (SDHCI_INT_CRC | SDHCI_INT_END_BIT | SDHCI_INT_INDEX |\ From patchwork Tue Sep 21 11:00:28 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tony Lindgren X-Patchwork-Id: 12507619 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=-16.8 required=3.0 tests=BAYES_00, 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 0F90CC43219 for ; Tue, 21 Sep 2021 11:00:44 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id EC46561168 for ; Tue, 21 Sep 2021 11:00:43 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232249AbhIULCL (ORCPT ); Tue, 21 Sep 2021 07:02:11 -0400 Received: from muru.com ([72.249.23.125]:35660 "EHLO muru.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232272AbhIULCJ (ORCPT ); Tue, 21 Sep 2021 07:02:09 -0400 Received: from hillo.muru.com (localhost [127.0.0.1]) by muru.com (Postfix) with ESMTP id 9A88C8127; Tue, 21 Sep 2021 11:01:07 +0000 (UTC) From: Tony Lindgren To: Ulf Hansson Cc: Adrian Hunter , Chunyan Zhang , Faiz Abbas , Kishon Vijay Abraham I , Santosh Shilimkar , linux-mmc@vger.kernel.org, linux-omap@vger.kernel.org Subject: [PATCH 4/5] mmc: sdhci-omap: Parse legacy ti,non-removable property Date: Tue, 21 Sep 2021 14:00:28 +0300 Message-Id: <20210921110029.21944-5-tony@atomide.com> X-Mailer: git-send-email 2.33.0 In-Reply-To: <20210921110029.21944-1-tony@atomide.com> References: <20210921110029.21944-1-tony@atomide.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-omap@vger.kernel.org We need to support the legacy ti,non-removable property too. Let's warn about the legacy property and mark the device as non-removable. Naturally all the mainline kernel devicetree files will get updated to use the standard non-removable property with the sdhci-omap conversion. But we also have folks updating their kernels with custom devicetree files that we need to consider. Signed-off-by: Tony Lindgren --- drivers/mmc/host/sdhci-omap.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/mmc/host/sdhci-omap.c b/drivers/mmc/host/sdhci-omap.c --- a/drivers/mmc/host/sdhci-omap.c +++ b/drivers/mmc/host/sdhci-omap.c @@ -1213,6 +1213,11 @@ static int sdhci_omap_probe(struct platform_device *pdev) if (of_find_property(dev->of_node, "dmas", NULL)) sdhci_switch_external_dma(host, true); + if (device_property_read_bool(dev, "ti,non-removable")) { + dev_warn_once(dev, "using old ti,non-removable property\n"); + mmc->caps |= MMC_CAP_NONREMOVABLE; + } + /* R1B responses is required to properly manage HW busy detection. */ mmc->caps |= MMC_CAP_NEED_RSP_BUSY; From patchwork Tue Sep 21 11:00:29 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tony Lindgren X-Patchwork-Id: 12507617 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=-16.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,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 AF2F8C433FE for ; Tue, 21 Sep 2021 11:00:44 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9FD5661178 for ; Tue, 21 Sep 2021 11:00:44 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232276AbhIULCM (ORCPT ); Tue, 21 Sep 2021 07:02:12 -0400 Received: from muru.com ([72.249.23.125]:35664 "EHLO muru.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232285AbhIULCL (ORCPT ); Tue, 21 Sep 2021 07:02:11 -0400 Received: from hillo.muru.com (localhost [127.0.0.1]) by muru.com (Postfix) with ESMTP id 707768132; Tue, 21 Sep 2021 11:01:09 +0000 (UTC) From: Tony Lindgren To: Ulf Hansson Cc: Adrian Hunter , Chunyan Zhang , Faiz Abbas , Kishon Vijay Abraham I , Santosh Shilimkar , linux-mmc@vger.kernel.org, linux-omap@vger.kernel.org Subject: [PATCH 5/5] mmc: sdhci-omap: Check MMCHS_HL_HWINFO register for ADMA Date: Tue, 21 Sep 2021 14:00:29 +0300 Message-Id: <20210921110029.21944-6-tony@atomide.com> X-Mailer: git-send-email 2.33.0 In-Reply-To: <20210921110029.21944-1-tony@atomide.com> References: <20210921110029.21944-1-tony@atomide.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-omap@vger.kernel.org ADMA is only available on controller instances that are connected to the L3 interconnect and are bus mastering capable. As the MMCHS_HL_HWINFO is in the module registers before omap registers and sdhci registers, and the omap registers and sdhci registers can be at different offsets depending on the SoC, let's read MMCHS_HL_HWINFO directly. Let's also switch to using device_property_present() while at it. Signed-off-by: Tony Lindgren --- drivers/mmc/host/sdhci-omap.c | 24 ++++++++++++++++++++++-- 1 file changed, 22 insertions(+), 2 deletions(-) diff --git a/drivers/mmc/host/sdhci-omap.c b/drivers/mmc/host/sdhci-omap.c --- a/drivers/mmc/host/sdhci-omap.c +++ b/drivers/mmc/host/sdhci-omap.c @@ -692,6 +692,22 @@ static void sdhci_omap_set_power(struct sdhci_host *host, unsigned char mode, mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, vdd); } +/* + * MMCHS_HL_HWINFO has the MADMA_EN bit set if the controller instance + * is connected to L3 interconnect and is bus master capable. Note that + * the MMCHS_HL_HWINFO register is in the module registers before the + * omap registers and sdhci registers. The offset can vary for omap + * registers depending on the SoC. Do not use sdhci_omap_readl() here. + */ +static bool sdhci_omap_has_adma(struct sdhci_omap_host *omap_host, int offset) +{ + /* MMCHS_HL_HWINFO register is only available on omap4 and later */ + if (offset < 0x200) + return false; + + return readl(omap_host->base + 4) & 1; +} + static int sdhci_omap_enable_dma(struct sdhci_host *host) { u32 reg; @@ -1209,8 +1225,12 @@ static int sdhci_omap_probe(struct platform_device *pdev) host->mmc_host_ops.execute_tuning = sdhci_omap_execute_tuning; host->mmc_host_ops.enable_sdio_irq = sdhci_omap_enable_sdio_irq; - /* Switch to external DMA only if there is the "dmas" property */ - if (of_find_property(dev->of_node, "dmas", NULL)) + /* + * Switch to external DMA only if there is the "dmas" property and + * ADMA is not available on the controller instance. + */ + if (device_property_present(dev, "dmas") && + !sdhci_omap_has_adma(omap_host, offset)) sdhci_switch_external_dma(host, true); if (device_property_read_bool(dev, "ti,non-removable")) {