From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755316AbbBTS5u (ORCPT ); Fri, 20 Feb 2015 13:57:50 -0500 Received: from mail-ig0-f179.google.com ([209.85.213.179]:39397 "EHLO mail-ig0-f179.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751808AbbBTS5f (ORCPT ); Fri, 20 Feb 2015 13:57:35 -0500 From: Doug Anderson To: Jaehoon Chung , Seungwon Jeon , Ulf Hansson Cc: Alim Akhtar , Sonny Rao , Andrew Bresticker , Heiko Stuebner , Addy Ke , Alexandru Stan , javier.martinez@collabora.co.uk, Doug Anderson , chris@printf.net, linux-mmc@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH 2/2] mmc: dw_mmc: Give a good reset after we give power Date: Fri, 20 Feb 2015 10:57:19 -0800 Message-Id: <1424458639-23330-2-git-send-email-dianders@chromium.org> X-Mailer: git-send-email 2.2.0.rc0.207.ga3a616c In-Reply-To: <1424458639-23330-1-git-send-email-dianders@chromium.org> References: <1424458639-23330-1-git-send-email-dianders@chromium.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org We should give dw_mmc a good reset after we apply power. On some boards vqmmc may actually be connected to the IP block in the SoC so it's good to reset after power comes in. Without this we sometimes see failures enumerating cards on rk3288. Signed-off-by: Doug Anderson --- drivers/mmc/host/dw_mmc.c | 27 ++++++++++++++++++--------- 1 file changed, 18 insertions(+), 9 deletions(-) diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c index 43fcae1..6a712ae 100644 --- a/drivers/mmc/host/dw_mmc.c +++ b/drivers/mmc/host/dw_mmc.c @@ -1119,13 +1119,23 @@ static void dw_mci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) mci_writel(slot->host, PWREN, regs); break; case MMC_POWER_ON: - if (!IS_ERR(mmc->supply.vqmmc) && !slot->host->vqmmc_enabled) { - ret = regulator_enable(mmc->supply.vqmmc); - if (ret < 0) - dev_err(slot->host->dev, - "failed to enable vqmmc regulator\n"); - else + if (!slot->host->vqmmc_enabled) { + if (!IS_ERR(mmc->supply.vqmmc)) { + ret = regulator_enable(mmc->supply.vqmmc); + if (ret < 0) + dev_err(slot->host->dev, + "failed to enable vqmmc\n"); + else + slot->host->vqmmc_enabled = true; + + } else { + /* Keep track so we don't reset again */ slot->host->vqmmc_enabled = true; + } + + /* Reset our state machine after powering on */ + dw_mci_ctrl_reset(slot->host, + SDMMC_CTRL_ALL_RESET_FLAGS); } /* Adjust clock / bus width after power is up */ @@ -1139,10 +1149,9 @@ static void dw_mci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) if (!IS_ERR(mmc->supply.vmmc)) mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, 0); - if (!IS_ERR(mmc->supply.vqmmc) && slot->host->vqmmc_enabled) { + if (!IS_ERR(mmc->supply.vqmmc) && slot->host->vqmmc_enabled) regulator_disable(mmc->supply.vqmmc); - slot->host->vqmmc_enabled = false; - } + slot->host->vqmmc_enabled = false; regs = mci_readl(slot->host, PWREN); regs &= ~(1 << slot->id); -- 2.2.0.rc0.207.ga3a616c