Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751988Ab3HUBrH (ORCPT ); Tue, 20 Aug 2013 21:47:07 -0400 Received: from rtits2.realtek.com ([60.250.210.242]:55453 "EHLO rtits2.realtek.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751417Ab3HUBqt (ORCPT ); Tue, 20 Aug 2013 21:46:49 -0400 X-SpamFilter-By: BOX Solutions SpamTrap 5.34 with qID r7L1kXp8012635, This message is accepted by code: ctloc85258 From: To: , CC: , , , , , Wei WANG Subject: [PATCH 2/3] mmc:rtsx:Clear SD_CLK toggle enable bit if switching voltage fail Date: Wed, 21 Aug 2013 09:46:26 +0800 Message-ID: X-Mailer: git-send-email 1.7.9.5 In-Reply-To: References: MIME-Version: 1.0 Content-Type: text/plain X-Originating-IP: [172.29.41.8] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1876 Lines: 63 From: Wei WANG If switching voltage fails, SD_CLK toggle enable bit should been cleared so that SD host can control SD clock automatically. Signed-off-by: Wei WANG --- drivers/mmc/host/rtsx_pci_sdmmc.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) diff --git a/drivers/mmc/host/rtsx_pci_sdmmc.c b/drivers/mmc/host/rtsx_pci_sdmmc.c index fcb368e..0fefe4e 100644 --- a/drivers/mmc/host/rtsx_pci_sdmmc.c +++ b/drivers/mmc/host/rtsx_pci_sdmmc.c @@ -227,6 +227,7 @@ static void sd_send_cmd_get_rsp(struct realtek_pci_sdmmc *host, int stat_idx = 0; u8 rsp_type; int rsp_len = 5; + bool clock_toggled = false; dev_dbg(sdmmc_dev(host), "%s: SD/MMC CMD %d, arg = 0x%08x\n", __func__, cmd_idx, arg); @@ -270,6 +271,8 @@ static void sd_send_cmd_get_rsp(struct realtek_pci_sdmmc *host, 0xFF, SD_CLK_TOGGLE_EN); if (err < 0) goto out; + + clock_toggled = true; } rtsx_pci_init_cmd(pcr); @@ -350,6 +353,10 @@ static void sd_send_cmd_get_rsp(struct realtek_pci_sdmmc *host, out: cmd->error = err; + + if (err && clock_toggled) + rtsx_pci_write_register(pcr, SD_BUS_STAT, + SD_CLK_TOGGLE_EN | SD_CLK_FORCE_STOP, 0); } static int sd_rw_multi(struct realtek_pci_sdmmc *host, struct mmc_request *mrq) @@ -1121,11 +1128,11 @@ static int sdmmc_switch_voltage(struct mmc_host *mmc, struct mmc_ios *ios) goto out; } +out: /* Stop toggle SD clock in idle */ err = rtsx_pci_write_register(pcr, SD_BUS_STAT, SD_CLK_TOGGLE_EN | SD_CLK_FORCE_STOP, 0); -out: mutex_unlock(&pcr->pcr_mutex); return err; -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/