From patchwork Mon Nov 19 13:20:42 2012 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: James Hogan X-Patchwork-Id: 1764771 Return-Path: X-Original-To: patchwork-linux-mmc@patchwork.kernel.org Delivered-To: patchwork-process-083081@patchwork1.kernel.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by patchwork1.kernel.org (Postfix) with ESMTP id 53CE53FCAE for ; Mon, 19 Nov 2012 13:21:17 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752233Ab2KSNVQ (ORCPT ); Mon, 19 Nov 2012 08:21:16 -0500 Received: from multi.imgtec.com ([194.200.65.239]:52684 "EHLO multi.imgtec.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752194Ab2KSNVP (ORCPT ); Mon, 19 Nov 2012 08:21:15 -0500 Message-ID: <50AA322A.1060604@imgtec.com> Date: Mon, 19 Nov 2012 13:20:42 +0000 From: James Hogan User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:15.0) Gecko/20120911 Thunderbird/15.0.1 MIME-Version: 1.0 To: Yuvaraj CD , linux-mmc , CC: "Chris Ball (laptop.org)" , Will , , "Girish K S (Linaro)" , "Thomas Abraham (Linaro)" , , Yuvaraj CD , Seungwon Jeon , Jaehoon Chung Subject: Re: [PATCH] mmc: dw_mmc: enable controller interrupt before calling mmc_start_host References: <1349686791-19652-1-git-send-email-yuvaraj.cd@samsung.com> In-Reply-To: X-Enigmail-Version: 1.4.4 X-Originating-IP: [192.168.154.65] X-SEF-Processed: 7_3_0_01181__2012_11_19_13_20_43 Sender: linux-mmc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-mmc@vger.kernel.org On 19/11/12 13:01, Yuvaraj CD wrote: > As mmc_start_host is getting called before enabling the dw_mmc controller > interrupt, there is a problem of missing the SDMMC_INT_CMD_DONE for the > very first command sent by the sdio_reset. > This problem occurs only when we disable MMC debugging i.e, MMC_DEBUG [=n]. > Hence this patch enables the dw_mmc controller interrupt before mmc_start_host. > > Signed-off-by: Yuvaraj CD Hi Yuvaraj, I get the following errors after this patch is applied (2da1d7f2948900cd50d38643db39f790edb3cc96, merged in v3.7-rc5) and the driver doesn't work as a result. Reverting it fixes the problem. mmc0: error -110 whilst initialising SD card mmc_host mmc0: Bus speed (slot 0) = 99840000Hz (slot req 300000Hz, actual 298922HZ div = 167) mmc0: error -110 whilst initialising SD card mmc_host mmc0: Bus speed (slot 0) = 99840000Hz (slot req 200000Hz, actual 199680HZ div = 250) mmc0: error -110 whilst initialising SD card mmc_host mmc0: Bus speed (slot 0) = 99840000Hz (slot req 195765Hz, actual 195764HZ div = 255) mmc0: error -110 whilst initialising SD card mmc_host mmc0: Bus speed (slot 0) = 99840000Hz (slot req 400000Hz, actual 399360HZ div = 125) mmc0: error -110 whilst initialising SD card mmc_host mmc0: Bus speed (slot 0) = 99840000Hz (slot req 300000Hz, actual 298922HZ div = 167) mmc0: error -110 whilst initialising SD card mmc_host mmc0: Bus speed (slot 0) = 99840000Hz (slot req 200000Hz, actual 199680HZ div = 250) mmc0: error -110 whilst initialising SD card mmc_host mmc0: Bus speed (slot 0) = 99840000Hz (slot req 195765Hz, actual 195764HZ div = 255) mmc0: error -110 whilst initialising SD card The interrupts are already cleared and disabled at the beginning of the probe function, so is the following sufficient (after reverting your patch) to fix the problem you've been observing? Thanks James > --- > drivers/mmc/host/dw_mmc.c | 29 +++++++++++++++-------------- > 1 file changed, 15 insertions(+), 14 deletions(-) > > diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c > index a23af77..729c031 100644 > --- a/drivers/mmc/host/dw_mmc.c > +++ b/drivers/mmc/host/dw_mmc.c > @@ -2233,6 +2233,21 @@ int dw_mci_probe(struct dw_mci *host) > else > host->num_slots = ((mci_readl(host, HCON) >> 1) & 0x1F) + 1; > > + /* > + * Enable interrupts for command done, data over, data empty, card det, > + * receive ready and error such as transmit, receive timeout, crc error > + */ > + mci_writel(host, RINTSTS, 0xFFFFFFFF); > + mci_writel(host, INTMASK, SDMMC_INT_CMD_DONE | SDMMC_INT_DATA_OVER | > + SDMMC_INT_TXDR | SDMMC_INT_RXDR | > + DW_MCI_ERROR_FLAGS | SDMMC_INT_CD); > + mci_writel(host, CTRL, SDMMC_CTRL_INT_ENABLE); /* Enable mci > interrupt */ > + > + dev_info(host->dev, "DW MMC controller at irq %d, " > + "%d bit host data width, " > + "%u deep fifo\n", > + host->irq, width, fifo_size); > + > /* We need at least one slot to succeed */ > for (i = 0; i < host->num_slots; i++) { > ret = dw_mci_init_slot(host, i); > @@ -2262,20 +2277,6 @@ int dw_mci_probe(struct dw_mci *host) > else > host->data_offset = DATA_240A_OFFSET; > > - /* > - * Enable interrupts for command done, data over, data empty, card det, > - * receive ready and error such as transmit, receive timeout, crc error > - */ > - mci_writel(host, RINTSTS, 0xFFFFFFFF); > - mci_writel(host, INTMASK, SDMMC_INT_CMD_DONE | SDMMC_INT_DATA_OVER | > - SDMMC_INT_TXDR | SDMMC_INT_RXDR | > - DW_MCI_ERROR_FLAGS | SDMMC_INT_CD); > - mci_writel(host, CTRL, SDMMC_CTRL_INT_ENABLE); /* Enable mci > interrupt */ > - > - dev_info(host->dev, "DW MMC controller at irq %d, " > - "%d bit host data width, " > - "%u deep fifo\n", > - host->irq, width, fifo_size); > if (host->quirks & DW_MCI_QUIRK_IDMAC_DTO) > dev_info(host->dev, "Internal DMAC interrupt fix enabled.\n"); > > -- > 1.7.9.5 > > -- > To unsubscribe from this list: send the line "unsubscribe linux-mmc" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > > > -- > James Hogan > --- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c index ec9b5a8..2be9899 100644 --- a/drivers/mmc/host/dw_mmc.c +++ b/drivers/mmc/host/dw_mmc.c @@ -2266,7 +2266,6 @@ int dw_mci_probe(struct dw_mci *host) * Enable interrupts for command done, data over, data empty, card det, * receive ready and error such as transmit, receive timeout, crc error */ - mci_writel(host, RINTSTS, 0xFFFFFFFF); mci_writel(host, INTMASK, SDMMC_INT_CMD_DONE | SDMMC_INT_DATA_OVER | SDMMC_INT_TXDR | SDMMC_INT_RXDR | DW_MCI_ERROR_FLAGS | SDMMC_INT_CD);