From patchwork Tue Nov 25 08:10:08 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: addy ke X-Patchwork-Id: 5374371 Return-Path: X-Original-To: patchwork-linux-mmc@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork1.web.kernel.org (Postfix) with ESMTP id AED049F2F5 for ; Tue, 25 Nov 2014 08:11:29 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id C2A522011B for ; Tue, 25 Nov 2014 08:11:28 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id B7B54200ED for ; Tue, 25 Nov 2014 08:11:27 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751981AbaKYIKv (ORCPT ); Tue, 25 Nov 2014 03:10:51 -0500 Received: from regular1.263xmail.com ([211.150.99.134]:35747 "EHLO regular1.263xmail.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751823AbaKYIKu (ORCPT ); Tue, 25 Nov 2014 03:10:50 -0500 Received: from addy.ke?rock-chips.com (unknown [192.168.167.158]) by regular1.263xmail.com (Postfix) with SMTP id EF90462E0; Tue, 25 Nov 2014 16:10:36 +0800 (CST) X-263anti-spam: KSV:0; X-MAIL-GRAY: 0 X-MAIL-DELIVERY: 1 X-KSVirus-check: 0 X-ABS-CHECKED: 4 Received: from localhost.localdomain (localhost.localdomain [127.0.0.1]) by smtp.263.net (Postfix) with ESMTP id 134FF2A8A9; Tue, 25 Nov 2014 16:10:29 +0800 (CST) X-RL-SENDER: addy.ke@rock-chips.com X-FST-TO: robh+dt@kernel.org X-SENDER-IP: 127.0.0.1 X-LOGIN-NAME: addy.ke@rock-chips.com X-UNIQUE-TAG: X-ATTACHMENT-NUM: 0 X-SENDER: kfx@rock-chips.com X-DNS-TYPE: 0 Received: from localhost.localdomain (unknown [127.0.0.1]) by smtp.263.net (Postfix) whith ESMTP id 977UL2HFY; Tue, 25 Nov 2014 16:10:34 +0800 (CST) From: Addy Ke To: robh+dt@kernel.org, pawel.moll@arm.com, mark.rutland@arm.com, ijc+devicetree@hellion.org.uk, galak@codeaurora.org, rdunlap@infradead.org, tgih.jun@samsung.com, jh80.chung@samsung.com, chris@printf.net, ulf.hansson@linaro.org, dinguyen@altera.com, heiko@sntech.de, olof@lixom.net, dianders@chromium.org, sonnyrao@chromium.org, amstan@chromium.org Cc: devicetree@vger.kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mmc@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-rockchip@lists.infradead.org, zhenfu.fang@rock-chips.com, cf@rock-chips.com, lintao@rock-chips.com, chenfen@rock-chips.com, zyf@rock-chips.com, xjq@rock-chips.com, huangtao@rock-chips.com, zyw@rock-chips.com, yzq@rock-chips.com, hj@rock-chips.com, kever.yang@rock-chips.com, zhangqing@rock-chips.com, hl@rock-chips.com, Addy Ke Subject: [PATCH v2] mmc: dw_mmc: add quirk for broken data transfer over scheme Date: Tue, 25 Nov 2014 16:10:08 +0800 Message-Id: <1416903008-4160-1-git-send-email-addy.ke@rock-chips.com> X-Mailer: git-send-email 1.8.3.2 In-Reply-To: <1415970338-2637-1-git-send-email-addy.ke@rock-chips.com> References: <1415970338-2637-1-git-send-email-addy.ke@rock-chips.com> Sender: linux-mmc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-mmc@vger.kernel.org X-Spam-Status: No, score=-6.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, T_RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP This patch add a new quirk to add a s/w timer to notify the driver to terminate current transfer and report a data timeout to the core, if DTO interrupt does NOT come within the given time. dw_mmc call mmc_request_done func to finish transfer depends on DTO interrupt. If DTO interrupt does not come in sending data state, the current transfer will be blocked. But this case really exists, when driver reads tuning data from card on RK3288-pink2 board. I measured waveforms by oscilloscope and found that card clock was always on and data lines were always holded high level in sending data state. We got the reply from synopsys: There are two counters but both use the same value of [31:8] bits. Data timeout counter doesn't wait for stop clock and you should get DRTO even when the clock is not stopped. Host Starvation timeout counter is triggered with stop clock condition. This means that host should get DRTO and DTO interrupt. But we really don't get any data-related interrupt in RK3X SoCs. And driver can't get data transfer state, it can do nothing but wait for. Signed-off-by: Addy Ke --- - fix some typo. - remove extra timeout value (250ms). - remove dw_mci_dto_start_monitor func. - use "broken-dto" for new quirk and change Subject for it. drivers/mmc/host/dw_mmc.c | 44 +++++++++++++++++++++++++++++++++++++++++++- include/linux/mmc/dw_mmc.h | 5 +++++ 2 files changed, 48 insertions(+), 1 deletion(-) diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c index b4c3044..bc09f50 100644 --- a/drivers/mmc/host/dw_mmc.c +++ b/drivers/mmc/host/dw_mmc.c @@ -1457,6 +1457,8 @@ static void dw_mci_tasklet_func(unsigned long priv) enum dw_mci_state state; enum dw_mci_state prev_state; unsigned int err; + unsigned int drto_clks; + unsigned int drto_ms; spin_lock(&host->lock); @@ -1522,8 +1524,17 @@ static void dw_mci_tasklet_func(unsigned long priv) } if (!test_and_clear_bit(EVENT_XFER_COMPLETE, - &host->pending_events)) + &host->pending_events)) { + if (host->quirks & DW_MCI_QUIRK_BROKEN_DTO) { + drto_clks = mci_readl(host, TMOUT) >> 8; + drto_ms = DIV_ROUND_UP(drto_clks * 1000, + host->bus_hz); + + mod_timer(&host->dto_timer, jiffies + + msecs_to_jiffies(drto_ms)); + } break; + } set_bit(EVENT_XFER_COMPLETE, &host->completed_events); @@ -2115,6 +2126,9 @@ static irqreturn_t dw_mci_interrupt(int irq, void *dev_id) } if (pending & SDMMC_INT_DATA_OVER) { + if (host->quirks & DW_MCI_QUIRK_BROKEN_DTO) + del_timer(&host->dto_timer); + mci_writel(host, RINTSTS, SDMMC_INT_DATA_OVER); if (!host->data_status) host->data_status = pending; @@ -2502,6 +2516,28 @@ ciu_out: return ret; } +static void dw_mci_dto_timer(unsigned long arg) +{ + struct dw_mci *host = (struct dw_mci *)arg; + + switch (host->state) { + case STATE_SENDING_DATA: + case STATE_DATA_BUSY: + /* + * 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. + */ + host->data_status = SDMMC_INT_DRTO; + set_bit(EVENT_DATA_ERROR, &host->pending_events); + set_bit(EVENT_DATA_COMPLETE, &host->pending_events); + tasklet_schedule(&host->tasklet); + break; + default: + break; + } +} + #ifdef CONFIG_OF static struct dw_mci_of_quirks { char *quirk; @@ -2513,6 +2549,9 @@ static struct dw_mci_of_quirks { }, { .quirk = "disable-wp", .id = DW_MCI_QUIRK_NO_WRITE_PROTECT, + }, { + .quirk = "broken-dto", + .id = DW_MCI_QUIRK_BROKEN_DTO, }, }; @@ -2654,6 +2693,9 @@ int dw_mci_probe(struct dw_mci *host) spin_lock_init(&host->lock); INIT_LIST_HEAD(&host->queue); + if (host->quirks & DW_MCI_QUIRK_BROKEN_DTO) + setup_timer(&host->dto_timer, + dw_mci_dto_timer, (unsigned long)host); /* * Get the host data width - this assumes that HCON has been set with diff --git a/include/linux/mmc/dw_mmc.h b/include/linux/mmc/dw_mmc.h index 42b724e..ff9bd1e 100644 --- a/include/linux/mmc/dw_mmc.h +++ b/include/linux/mmc/dw_mmc.h @@ -98,6 +98,7 @@ struct mmc_data; * @irq_flags: The flags to be passed to request_irq. * @irq: The irq value to be passed to request_irq. * @sdio_id0: Number of slot0 in the SDIO interrupt registers. + * @dto_timer: Timer for broken data transfer over scheme. * * Locking * ======= @@ -196,6 +197,8 @@ struct dw_mci { int irq; int sdio_id0; + + struct timer_list dto_timer; }; /* DMA ops for Internal/External DMAC interface */ @@ -220,6 +223,8 @@ struct dw_mci_dma_ops { #define DW_MCI_QUIRK_BROKEN_CARD_DETECTION BIT(3) /* No write protect */ #define DW_MCI_QUIRK_NO_WRITE_PROTECT BIT(4) +/* Timer for broken data transfer over scheme */ +#define DW_MCI_QUIRK_BROKEN_DTO BIT(5) /* Slot level quirks */ /* This slot has no write protect */