From patchwork Wed Dec 1 15:38:01 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?q?M=C3=A5rten_Lindahl?= X-Patchwork-Id: 520054 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 918F3C433FE for ; Wed, 1 Dec 2021 15:38:28 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1351079AbhLAPlr (ORCPT ); Wed, 1 Dec 2021 10:41:47 -0500 Received: from smtp2.axis.com ([195.60.68.18]:16713 "EHLO smtp2.axis.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1351080AbhLAPlq (ORCPT ); Wed, 1 Dec 2021 10:41:46 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=axis.com; q=dns/txt; s=axis-central1; t=1638373105; x=1669909105; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=JWSctjhkZdPxSDwn5yAHNL/RyvKgrdS6Vr/fjE741Vs=; b=XnIXv+SPDsqvYIUvF8yyLy5HUUh539Z3/g6OP0EMd8JJgVmvFYCd+JbZ YYJ5Ruhf0aIuOMyPqulPknvY9zJR14IZ6BvivxpMwE9gZsPV9OFOpezed Q6O6DmXQJ0OYhggRP4zfsy0L91OQ/863W4zuEYNoOCWfYZdYF1dErpcq6 FrLthszYeYEK2oB7qIsSf8WdlBAmk9oODhzHuegnf47YNNlbVmCRDeLY7 GwLoxg9/9YuL5VS7dmh+JtuN3CyegCHWYKHjIAzOX+kw5V9hY2cdUaFmK t3XeA5/oo9IyEcaUF8SexMiNLHc+25q/F34x8W0FHUgMXhtcUjubFaiLz w==; From: =?utf-8?q?M=C3=A5rten_Lindahl?= To: Ulf Hansson , Rob Herring , Krzysztof Kozlowski , Jaehoon Chung CC: Doug Anderson , , , , , , =?utf-8?q?M=C3=A5rten_Lindahl?= Subject: [PATCH 1/4] dt-bindings: mmc: exynos-dw-mshc: Add support for ARTPEC-8 Date: Wed, 1 Dec 2021 16:38:01 +0100 Message-ID: <20211201153804.27655-2-marten.lindahl@axis.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20211201153804.27655-1-marten.lindahl@axis.com> References: <20211201153804.27655-1-marten.lindahl@axis.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-mmc@vger.kernel.org The ARTPEC-8 SoC has a DWMMC controller that is compatible with the Exynos 7 version v2.70a. The main differences from Exynos 7 is that it does not support HS400 and has extended data read timeout. Add compatibility string "samsung,artpec8-dw-mshc" for ARTPEC-8. Signed-off-by: Mårten Lindahl --- Documentation/devicetree/bindings/mmc/exynos-dw-mshc.txt | 2 ++ 1 file changed, 2 insertions(+) diff --git a/Documentation/devicetree/bindings/mmc/exynos-dw-mshc.txt b/Documentation/devicetree/bindings/mmc/exynos-dw-mshc.txt index 0419a63f73a0..161be451a1f0 100644 --- a/Documentation/devicetree/bindings/mmc/exynos-dw-mshc.txt +++ b/Documentation/devicetree/bindings/mmc/exynos-dw-mshc.txt @@ -22,6 +22,8 @@ Required Properties: specific extensions. - "samsung,exynos7-dw-mshc-smu": for controllers with Samsung Exynos7 specific extensions having an SMU. + - "samsung,artpec8-dw-mshc": for controllers with ARTPEC-8 specific + extensions. * samsung,dw-mshc-ciu-div: Specifies the divider value for the card interface unit (ciu) clock. This property is applicable only for Exynos5 SoC's and From patchwork Wed Dec 1 15:38:02 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?q?M=C3=A5rten_Lindahl?= X-Patchwork-Id: 520053 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 C3D92C43219 for ; Wed, 1 Dec 2021 15:38:29 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1351077AbhLAPlt (ORCPT ); Wed, 1 Dec 2021 10:41:49 -0500 Received: from smtp2.axis.com ([195.60.68.18]:16713 "EHLO smtp2.axis.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1351078AbhLAPls (ORCPT ); Wed, 1 Dec 2021 10:41:48 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=axis.com; q=dns/txt; s=axis-central1; t=1638373107; x=1669909107; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=L1p0NCiVfV1uSV0n/8+gTKWSF5LL/10Fkrf/upOznjM=; b=GX8qj3RDbsZjZMKqTTfm/+eVYxGIW3gorXp7SV2udZSbjFVN6u7NhzCV JX/tc0A9pJuclqaF9W4atu2sNl0TUSepxQtnwqh06Rq0M4G+W1njMS1I3 hn1Zo+B55s75sIcXtHrn6AUU1MzXwWy4jkX6nr4qLA9ET0uZCrE+7wTHS cpZ7MCdaVgyarQy7BCedR1k3jD4L1DypuVo39ExFiHqI35+BnYlsRX/nO 9UULsSmiohh90PZQDvy9sqIUXTwUhqM8m2BeL03tW5M+khRAu4aPCAhUG sC2AA+p6SuUwbYZph5F+BwpOHvIc2gfVjcXtkAN5Y/Hh9fBKL3ObDFRis w==; From: =?utf-8?q?M=C3=A5rten_Lindahl?= To: Ulf Hansson , Rob Herring , Krzysztof Kozlowski , Jaehoon Chung CC: Doug Anderson , , , , , , =?utf-8?q?M=C3=A5rten_Lindahl?= Subject: [PATCH 2/4] mmc: dw_mmc-exynos: Add support for ARTPEC-8 Date: Wed, 1 Dec 2021 16:38:02 +0100 Message-ID: <20211201153804.27655-3-marten.lindahl@axis.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20211201153804.27655-1-marten.lindahl@axis.com> References: <20211201153804.27655-1-marten.lindahl@axis.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-mmc@vger.kernel.org The ARTPEC-8 SoC has a DWMMC controller that is compatible with the Exynos 7 version v2.70a. The main differences from Exynos 7 is that it does not support HS400 and has extended data read timeout. This patch adds compatibility string "samsung,artpec8-dw-mshc" for ARTPEC-8, and DW_MCI_TYPE_ARTPEC8 is added to the dw_mci_exynos_type. Signed-off-by: Mårten Lindahl --- drivers/mmc/host/dw_mmc-exynos.c | 47 ++++++++++++++++++++++++-------- 1 file changed, 36 insertions(+), 11 deletions(-) diff --git a/drivers/mmc/host/dw_mmc-exynos.c b/drivers/mmc/host/dw_mmc-exynos.c index f76eeeb0cc53..cae7c94b5d6e 100644 --- a/drivers/mmc/host/dw_mmc-exynos.c +++ b/drivers/mmc/host/dw_mmc-exynos.c @@ -28,6 +28,7 @@ enum dw_mci_exynos_type { DW_MCI_TYPE_EXYNOS5420_SMU, DW_MCI_TYPE_EXYNOS7, DW_MCI_TYPE_EXYNOS7_SMU, + DW_MCI_TYPE_ARTPEC8, }; /* Exynos implementation specific driver private data */ @@ -69,6 +70,9 @@ static struct dw_mci_exynos_compatible { }, { .compatible = "samsung,exynos7-dw-mshc-smu", .ctrl_type = DW_MCI_TYPE_EXYNOS7_SMU, + }, { + .compatible = "samsung,artpec8-dw-mshc", + .ctrl_type = DW_MCI_TYPE_ARTPEC8, }, }; @@ -81,7 +85,8 @@ static inline u8 dw_mci_exynos_get_ciu_div(struct dw_mci *host) else if (priv->ctrl_type == DW_MCI_TYPE_EXYNOS4210) return EXYNOS4210_FIXED_CIU_CLK_DIV; else if (priv->ctrl_type == DW_MCI_TYPE_EXYNOS7 || - priv->ctrl_type == DW_MCI_TYPE_EXYNOS7_SMU) + priv->ctrl_type == DW_MCI_TYPE_EXYNOS7_SMU || + priv->ctrl_type == DW_MCI_TYPE_ARTPEC8) return SDMMC_CLKSEL_GET_DIV(mci_readl(host, CLKSEL64)) + 1; else return SDMMC_CLKSEL_GET_DIV(mci_readl(host, CLKSEL)) + 1; @@ -133,7 +138,8 @@ static void dw_mci_exynos_set_clksel_timing(struct dw_mci *host, u32 timing) u32 clksel; if (priv->ctrl_type == DW_MCI_TYPE_EXYNOS7 || - priv->ctrl_type == DW_MCI_TYPE_EXYNOS7_SMU) + priv->ctrl_type == DW_MCI_TYPE_EXYNOS7_SMU || + priv->ctrl_type == DW_MCI_TYPE_ARTPEC8) clksel = mci_readl(host, CLKSEL64); else clksel = mci_readl(host, CLKSEL); @@ -141,7 +147,8 @@ static void dw_mci_exynos_set_clksel_timing(struct dw_mci *host, u32 timing) clksel = (clksel & ~SDMMC_CLKSEL_TIMING_MASK) | timing; if (priv->ctrl_type == DW_MCI_TYPE_EXYNOS7 || - priv->ctrl_type == DW_MCI_TYPE_EXYNOS7_SMU) + priv->ctrl_type == DW_MCI_TYPE_EXYNOS7_SMU || + priv->ctrl_type == DW_MCI_TYPE_ARTPEC8) mci_writel(host, CLKSEL64, clksel); else mci_writel(host, CLKSEL, clksel); @@ -210,14 +217,16 @@ static int dw_mci_exynos_resume_noirq(struct device *dev) return ret; if (priv->ctrl_type == DW_MCI_TYPE_EXYNOS7 || - priv->ctrl_type == DW_MCI_TYPE_EXYNOS7_SMU) + priv->ctrl_type == DW_MCI_TYPE_EXYNOS7_SMU || + priv->ctrl_type == DW_MCI_TYPE_ARTPEC8) clksel = mci_readl(host, CLKSEL64); else clksel = mci_readl(host, CLKSEL); if (clksel & SDMMC_CLKSEL_WAKEUP_INT) { if (priv->ctrl_type == DW_MCI_TYPE_EXYNOS7 || - priv->ctrl_type == DW_MCI_TYPE_EXYNOS7_SMU) + priv->ctrl_type == DW_MCI_TYPE_EXYNOS7_SMU || + priv->ctrl_type == DW_MCI_TYPE_ARTPEC8) mci_writel(host, CLKSEL64, clksel); else mci_writel(host, CLKSEL, clksel); @@ -238,7 +247,8 @@ static void dw_mci_exynos_config_hs400(struct dw_mci *host, u32 timing) * Not supported to configure register * related to HS400 */ - if (priv->ctrl_type < DW_MCI_TYPE_EXYNOS5420) { + if ((priv->ctrl_type < DW_MCI_TYPE_EXYNOS5420) || + (priv->ctrl_type == DW_MCI_TYPE_ARTPEC8)) { if (timing == MMC_TIMING_MMC_HS400) dev_warn(host->dev, "cannot configure HS400, unsupported chipset\n"); @@ -394,7 +404,8 @@ static inline u8 dw_mci_exynos_get_clksmpl(struct dw_mci *host) struct dw_mci_exynos_priv_data *priv = host->priv; if (priv->ctrl_type == DW_MCI_TYPE_EXYNOS7 || - priv->ctrl_type == DW_MCI_TYPE_EXYNOS7_SMU) + priv->ctrl_type == DW_MCI_TYPE_EXYNOS7_SMU || + priv->ctrl_type == DW_MCI_TYPE_ARTPEC8) return SDMMC_CLKSEL_CCLK_SAMPLE(mci_readl(host, CLKSEL64)); else return SDMMC_CLKSEL_CCLK_SAMPLE(mci_readl(host, CLKSEL)); @@ -406,13 +417,15 @@ static inline void dw_mci_exynos_set_clksmpl(struct dw_mci *host, u8 sample) struct dw_mci_exynos_priv_data *priv = host->priv; if (priv->ctrl_type == DW_MCI_TYPE_EXYNOS7 || - priv->ctrl_type == DW_MCI_TYPE_EXYNOS7_SMU) + priv->ctrl_type == DW_MCI_TYPE_EXYNOS7_SMU || + priv->ctrl_type == DW_MCI_TYPE_ARTPEC8) clksel = mci_readl(host, CLKSEL64); else clksel = mci_readl(host, CLKSEL); clksel = SDMMC_CLKSEL_UP_SAMPLE(clksel, sample); if (priv->ctrl_type == DW_MCI_TYPE_EXYNOS7 || - priv->ctrl_type == DW_MCI_TYPE_EXYNOS7_SMU) + priv->ctrl_type == DW_MCI_TYPE_EXYNOS7_SMU || + priv->ctrl_type == DW_MCI_TYPE_ARTPEC8) mci_writel(host, CLKSEL64, clksel); else mci_writel(host, CLKSEL, clksel); @@ -425,7 +438,8 @@ static inline u8 dw_mci_exynos_move_next_clksmpl(struct dw_mci *host) u8 sample; if (priv->ctrl_type == DW_MCI_TYPE_EXYNOS7 || - priv->ctrl_type == DW_MCI_TYPE_EXYNOS7_SMU) + priv->ctrl_type == DW_MCI_TYPE_EXYNOS7_SMU || + priv->ctrl_type == DW_MCI_TYPE_ARTPEC8) clksel = mci_readl(host, CLKSEL64); else clksel = mci_readl(host, CLKSEL); @@ -434,7 +448,8 @@ static inline u8 dw_mci_exynos_move_next_clksmpl(struct dw_mci *host) clksel = SDMMC_CLKSEL_UP_SAMPLE(clksel, sample); if (priv->ctrl_type == DW_MCI_TYPE_EXYNOS7 || - priv->ctrl_type == DW_MCI_TYPE_EXYNOS7_SMU) + priv->ctrl_type == DW_MCI_TYPE_EXYNOS7_SMU || + priv->ctrl_type == DW_MCI_TYPE_ARTPEC8) mci_writel(host, CLKSEL64, clksel); else mci_writel(host, CLKSEL, clksel); @@ -543,6 +558,14 @@ static const struct dw_mci_drv_data exynos_drv_data = { .prepare_hs400_tuning = dw_mci_exynos_prepare_hs400_tuning, }; +static const struct dw_mci_drv_data artpec_drv_data = { + .common_caps = MMC_CAP_CMD23, + .init = dw_mci_exynos_priv_init, + .set_ios = dw_mci_exynos_set_ios, + .parse_dt = dw_mci_exynos_parse_dt, + .execute_tuning = dw_mci_exynos_execute_tuning, +}; + static const struct of_device_id dw_mci_exynos_match[] = { { .compatible = "samsung,exynos4412-dw-mshc", .data = &exynos_drv_data, }, @@ -556,6 +579,8 @@ static const struct of_device_id dw_mci_exynos_match[] = { .data = &exynos_drv_data, }, { .compatible = "samsung,exynos7-dw-mshc-smu", .data = &exynos_drv_data, }, + { .compatible = "samsung,artpec8-dw-mshc", + .data = &artpec_drv_data, }, {}, }; MODULE_DEVICE_TABLE(of, dw_mci_exynos_match); From patchwork Wed Dec 1 15:38:03 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?q?M=C3=A5rten_Lindahl?= X-Patchwork-Id: 519541 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 B0BC1C433F5 for ; Wed, 1 Dec 2021 15:38:30 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1351084AbhLAPlu (ORCPT ); Wed, 1 Dec 2021 10:41:50 -0500 Received: from smtp1.axis.com ([195.60.68.17]:57193 "EHLO smtp1.axis.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1350676AbhLAPlt (ORCPT ); Wed, 1 Dec 2021 10:41:49 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=axis.com; q=dns/txt; s=axis-central1; t=1638373108; x=1669909108; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=iO8jJWMqoAAW4Jlh6nzdM1f0Z6tG13tscAmxz+u6rOo=; b=dfl1C4WyADkKxqdcOdJldbZ+1K3h+6cZpUJpfUbRjvrvfNgevoe00xhB X/7/j8MESVFRmG+h0B2q94n7nSWq4uN6HkIbJBB/f0ozX1Pte3pdYeRWS ArOeLvjHrZd6mZJ/A8ZbZrIJgir4yq/KN5isLS3f2uzfuOdD9B72ijFxZ yzjitF9/4gaV8qoQV75t1HxURWTRdovNoM1ORqUeT96cYZtLF0DCKil3N qTiHZOj9yKGgGNAHlqcT/mLXpPvm34uOa0jXPxqiIr/Kow8XrZI0R1co7 K+c15u2R85m/R6yeggYefj151oj/eJbvRf6ReRVK/b5nZSvLhHzWyorSc g==; From: =?utf-8?q?M=C3=A5rten_Lindahl?= To: Ulf Hansson , Rob Herring , Krzysztof Kozlowski , Jaehoon Chung CC: Doug Anderson , , , , , , =?utf-8?q?M=C3=A5rten_Lindahl?= Subject: [PATCH 3/4] mmc: dw_mmc: Add quirk for extended data read timeout Date: Wed, 1 Dec 2021 16:38:03 +0100 Message-ID: <20211201153804.27655-4-marten.lindahl@axis.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20211201153804.27655-1-marten.lindahl@axis.com> References: <20211201153804.27655-1-marten.lindahl@axis.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-mmc@vger.kernel.org Current dw_mci driver supports a TMOUT register which consists of a 24 bit field (TMOUT[31:8]) for the DATA_TIMEOUT. The maximum value of this field is 0xFFFFFF, which with a 200MHz clock will give a full DRTO of: 0xFFFFFF / 200000000 => ~84 ms However, the ARTPEC-8 SoC DWMMC IP version has a TMOUT register with an extended DATA_TIMEOUT field, which supports longer timers for the DRTO. In this version the DATA_TIMEOUT field is split into two, which with the same 200MHz clock as above will allow a maximum timeout of: ((TMOUT[10:8] -1) * 0xFFFFFF + TMOUT[31:11] * 8) / 200000000 => ~587 ms Add a quirk to support this. The quirk is enabled for ARTPEC-8 SoCs. Signed-off-by: Mårten Lindahl --- drivers/mmc/host/dw_mmc-exynos.c | 5 +++++ drivers/mmc/host/dw_mmc.c | 33 ++++++++++++++++++++++++++++---- drivers/mmc/host/dw_mmc.h | 7 +++++++ 3 files changed, 41 insertions(+), 4 deletions(-) diff --git a/drivers/mmc/host/dw_mmc-exynos.c b/drivers/mmc/host/dw_mmc-exynos.c index cae7c94b5d6e..6ae9c0ec1282 100644 --- a/drivers/mmc/host/dw_mmc-exynos.c +++ b/drivers/mmc/host/dw_mmc-exynos.c @@ -127,6 +127,11 @@ static int dw_mci_exynos_priv_init(struct dw_mci *host) DQS_CTRL_GET_RD_DELAY(priv->saved_strobe_ctrl); } + if (priv->ctrl_type == DW_MCI_TYPE_ARTPEC8) { + /* Quirk needed for ARTPEC-8 SoCs */ + host->quirks |= DW_MMC_QUIRK_EXTENDED_TMOUT; + } + host->bus_hz /= (priv->ciu_div + 1); return 0; diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c index f2a14a434bef..45ea9fd97a6a 100644 --- a/drivers/mmc/host/dw_mmc.c +++ b/drivers/mmc/host/dw_mmc.c @@ -1289,6 +1289,7 @@ static void dw_mci_set_data_timeout(struct dw_mci *host, { u32 clk_div, tmout; u64 tmp; + unsigned int tmp2; clk_div = (mci_readl(host, CLKDIV) & 0xFF) * 2; if (clk_div == 0) @@ -1301,10 +1302,28 @@ static void dw_mci_set_data_timeout(struct dw_mci *host, tmout = 0xFF; /* Set maximum */ /* TMOUT[31:8] (DATA_TIMEOUT) */ - if (!tmp || tmp > 0xFFFFFF) - tmout |= (0xFFFFFF << 8); - else - tmout |= (tmp & 0xFFFFFF) << 8; + if (host->quirks & DW_MMC_QUIRK_EXTENDED_TMOUT) { + /* + * Extended HW timer (max = 0x6FFFFF2): + * ((TMOUT[10:8] - 1) * 0xFFFFFF + TMOUT[31:11] * 8) + */ + if (!tmp || tmp > 0x6FFFFF2) + tmout |= (0xFFFFFF << 8); + else { + /* TMOUT[10:8] */ + tmp2 = (((unsigned int)tmp / 0xFFFFFF) + 1) & 0x7; + tmout |= tmp2 << 8; + + /* TMOUT[31:11] */ + tmp = tmp - ((tmp2 - 1) * 0xFFFFFF); + tmout |= (tmp & 0xFFFFF8) << 8; + } + } else { + if (!tmp || tmp > 0xFFFFFF) + tmout |= (0xFFFFFF << 8); + else + tmout |= (tmp & 0xFFFFFF) << 8; + } mci_writel(host, TMOUT, tmout); dev_dbg(host->dev, "timeout_ns: %u => TMOUT[31:8]: 0x%#08x", @@ -2005,9 +2024,15 @@ static void dw_mci_set_drto(struct dw_mci *host) if (drto_div == 0) drto_div = 1; + if (host->quirks & DW_MMC_QUIRK_EXTENDED_TMOUT) + drto_clks = (((drto_clks & 0x7) - 1) * 0xFFFFFF) + + ((drto_clks & 0xFFFFF8)); + drto_ms = DIV_ROUND_UP_ULL((u64)MSEC_PER_SEC * drto_clks * drto_div, host->bus_hz); + dev_dbg(host->dev, "drto_ms: %u\n", drto_ms); + /* add a bit spare time */ drto_ms += 10; diff --git a/drivers/mmc/host/dw_mmc.h b/drivers/mmc/host/dw_mmc.h index 771d5afa3136..071f4479f166 100644 --- a/drivers/mmc/host/dw_mmc.h +++ b/drivers/mmc/host/dw_mmc.h @@ -118,6 +118,7 @@ struct dw_mci_dma_slave { * @part_buf: Simple buffer for partial fifo reads/writes. * @push_data: Pointer to FIFO push function. * @pull_data: Pointer to FIFO pull function. + * @quirks: Set of quirks that apply to specific versions of the IP. * @vqmmc_enabled: Status of vqmmc, should be true or false. * @irq_flags: The flags to be passed to request_irq. * @irq: The irq value to be passed to request_irq. @@ -223,6 +224,9 @@ struct dw_mci { void (*push_data)(struct dw_mci *host, void *buf, int cnt); void (*pull_data)(struct dw_mci *host, void *buf, int cnt); + /* Workaround flags */ + u32 quirks; + bool vqmmc_enabled; unsigned long irq_flags; /* IRQ flags */ int irq; @@ -274,6 +278,9 @@ struct dw_mci_board { struct dma_pdata *data; }; +/* Support for longer data read timeout */ +#define DW_MMC_QUIRK_EXTENDED_TMOUT (1<<0) + #define DW_MMC_240A 0x240a #define DW_MMC_280A 0x280a From patchwork Wed Dec 1 15:38:04 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?q?M=C3=A5rten_Lindahl?= X-Patchwork-Id: 519540 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 73F43C4167D for ; Wed, 1 Dec 2021 15:38:32 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1351078AbhLAPlw (ORCPT ); Wed, 1 Dec 2021 10:41:52 -0500 Received: from smtp2.axis.com ([195.60.68.18]:17640 "EHLO smtp2.axis.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1350676AbhLAPlv (ORCPT ); Wed, 1 Dec 2021 10:41:51 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=axis.com; q=dns/txt; s=axis-central1; t=1638373111; x=1669909111; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=NeRpLsWyPIeNTXYAGIU96z1OBWXWfVQIvsePl4gHj9M=; b=fHASomY4GU3ZzBQf75XYjJSL/37kC//KhEbSXDndOjDr2prdja1/2bSc 3WVT1ITxEA+QNLMP3EHjW6qN+lW0XJtKz5f3CH8bLmBH09PsAKaEU8UB4 89K4/JFLdIhkwaoUkhKmACGIyhAfwN2+QmGeS4DvLFz74mvMTmj0UsH6v 0BW9In852l7J69hUdg1DL0YMmrxBJ08h1XUJNrmur60K6nvSdDrCaOXIL RbOLtcTbTb6DuXn3/pMJkYWHTGsAoFNEu6lb9fyF7CdHuE0Up3pPgU6V5 1ii7sUNarz5+k4/TZyF2C7tpODHW6ipIuEnzqU+xuMTsY9PTkMCvVJDDv w==; From: =?utf-8?q?M=C3=A5rten_Lindahl?= To: Ulf Hansson , Rob Herring , Krzysztof Kozlowski , Jaehoon Chung CC: Doug Anderson , , , , , , =?utf-8?q?M=C3=A5rten_Lindahl?= Subject: [PATCH 4/4] mmc: dw_mmc: Do not wait for DTO in case of error Date: Wed, 1 Dec 2021 16:38:04 +0100 Message-ID: <20211201153804.27655-5-marten.lindahl@axis.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20211201153804.27655-1-marten.lindahl@axis.com> References: <20211201153804.27655-1-marten.lindahl@axis.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-mmc@vger.kernel.org When running the ARTPEC-8 DWMMC IP version, and a data error interrupt comes during a data read transfer, there is no guarantee for the data transfer over interrupt (DTO) to come within the specified data timeout. This case is handled by the dto_timer handler which will complete the request with the comment: /* * If DTO interrupt does NOT come in sending data state, * we should notify the driver to terminate current transfer * and report a data timeout to the core. */ But since the ARTPEC-8 DWMMC IP version, supports an extended TMOUT register which allows longer timeouts than the non ARTPEC-8 version does, waiting for the dto_timer to complete the request in error cases may cause the request to take significantly longer time than necessary. This is specifically true for the failing steps during tuning of a device. Fix this by completing the request when the error interrupt comes. Signed-off-by: Mårten Lindahl --- drivers/mmc/host/dw_mmc.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c index 45ea9fd97a6a..d6b76f47b1a2 100644 --- a/drivers/mmc/host/dw_mmc.c +++ b/drivers/mmc/host/dw_mmc.c @@ -2777,11 +2777,19 @@ static irqreturn_t dw_mci_interrupt(int irq, void *dev_id) if (pending & DW_MCI_DATA_ERROR_FLAGS) { spin_lock(&host->irq_lock); + if (host->quirks & DW_MMC_QUIRK_EXTENDED_TMOUT) + del_timer(&host->dto_timer); + /* if there is an error report DATA_ERROR */ mci_writel(host, RINTSTS, DW_MCI_DATA_ERROR_FLAGS); host->data_status = pending; smp_wmb(); /* drain writebuffer */ set_bit(EVENT_DATA_ERROR, &host->pending_events); + + if (host->quirks & DW_MMC_QUIRK_EXTENDED_TMOUT) + /* In case of error, we cannot expect a DTO */ + set_bit(EVENT_DATA_COMPLETE, &host->pending_events); + tasklet_schedule(&host->tasklet); spin_unlock(&host->irq_lock);