From patchwork Mon Dec 20 11:30:26 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: 526219 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 13ECCC4167E for ; Mon, 20 Dec 2021 11:30:45 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231863AbhLTLao (ORCPT ); Mon, 20 Dec 2021 06:30:44 -0500 Received: from smtp2.axis.com ([195.60.68.18]:48924 "EHLO smtp2.axis.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231831AbhLTLan (ORCPT ); Mon, 20 Dec 2021 06:30:43 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=axis.com; q=dns/txt; s=axis-central1; t=1639999843; x=1671535843; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=0SNKihJIxusapvakMuJ2Rl8gGEXUWqARlz6agx/hpEY=; b=hJaq4XVa0crNbD5HbU+Hwpht1J7Sd7j9ditgzV8hQGprGaeJNnHsAsXr gwVjxtEOa3VfDNUUfz5HitcoXpjPi0hzNi27n9Y5pWuHeZdG9Uf/NIvir q/fn/roa/WDJQ9BYRNXXnuAeeJXR8D7EwYsguKS4jB7HP86koCmEitlKi J8lsnWfDlNWPxA83a7PFDFeaIoNftmVAdFzy8ZA7oDLdlAZJ//Hxq2WRK XsMj3bOxlTTHLwK2oShhhJPnAmDp5/twZl/vL2Rn0/OOSO/6wKsR7lifU GnTPVzZzaAiZQD52nsMHFlIR/UmzW07V506lQ32JVOimhIQ8Ea/y8R9Nt Q==; 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 v5 4/4] mmc: dw_mmc: Do not wait for DTO in case of error Date: Mon, 20 Dec 2021 12:30:26 +0100 Message-ID: <20211220113026.21129-5-marten.lindahl@axis.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20211220113026.21129-1-marten.lindahl@axis.com> References: <20211220113026.21129-1-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. Since this fix is specific for the ARTPEC-8, a quirk is added. Signed-off-by: Mårten Lindahl --- v3: - Define DW_MMC_QUIRK_EXTENDED_TMOUT. - Implement DW_MMC_QUIRK_EXTENDED_TMOUT for the ARTPEC-8 SoC. drivers/mmc/host/dw_mmc-exynos.c | 5 +++++ drivers/mmc/host/dw_mmc.c | 9 +++++++++ drivers/mmc/host/dw_mmc.h | 5 +++++ 3 files changed, 19 insertions(+) diff --git a/drivers/mmc/host/dw_mmc-exynos.c b/drivers/mmc/host/dw_mmc-exynos.c index 3914024cf415..ca5be4445ae0 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 the ARTPEC-8 SoC */ + 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 a7745e193afa..da09a06898c9 100644 --- a/drivers/mmc/host/dw_mmc.c +++ b/drivers/mmc/host/dw_mmc.c @@ -2762,11 +2762,20 @@ 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); diff --git a/drivers/mmc/host/dw_mmc.h b/drivers/mmc/host/dw_mmc.h index 0a85d05eaf12..7f1e38621d13 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 +224,7 @@ 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); + u32 quirks; bool vqmmc_enabled; unsigned long irq_flags; /* IRQ flags */ int irq; @@ -274,6 +276,9 @@ struct dw_mci_board { struct dma_pdata *data; }; +/* Support for longer data read timeout */ +#define DW_MMC_QUIRK_EXTENDED_TMOUT BIT(0) + #define DW_MMC_240A 0x240a #define DW_MMC_280A 0x280a