From mboxrd@z Thu Jan 1 00:00:00 1970 From: Shawn Lin Subject: [PATCH 2/2] mmc: dw_mmc: add hw_reset extension hook Date: Thu, 22 Oct 2015 14:19:53 +0800 Message-ID: <1445494793-16905-1-git-send-email-shawn.lin@rock-chips.com> References: <1445494740-16778-1-git-send-email-shawn.lin@rock-chips.com> Return-path: Received: from lucky1.263xmail.com ([211.157.147.130]:45609 "EHLO lucky1.263xmail.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751352AbbJVGd7 (ORCPT ); Thu, 22 Oct 2015 02:33:59 -0400 In-Reply-To: <1445494740-16778-1-git-send-email-shawn.lin@rock-chips.com> Sender: linux-mmc-owner@vger.kernel.org List-Id: linux-mmc@vger.kernel.org To: Jaehoon Chung Cc: Ulf Hansson , linux-mmc@vger.kernel.org, linux-kernel@vger.kernel.org, Shawn Lin This patch add hw_reset for dw_mmc to implement hw reset procedure. It's useful for mmc core to recover emmc devices if emmc runs into unexpected state. Add MMC_CAP_HW_RESET capability to dw_mmc extension driver directly if it needs hw_reset. Signed-off-by: Shawn Lin --- drivers/mmc/host/dw_mmc.c | 4 ++++ drivers/mmc/host/dw_mmc.h | 2 ++ 2 files changed, 6 insertions(+) diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c index 8a0f2995..46b12de 100644 --- a/drivers/mmc/host/dw_mmc.c +++ b/drivers/mmc/host/dw_mmc.c @@ -1482,6 +1482,10 @@ static void dw_mci_hw_reset(struct mmc_host *mmc) { struct dw_mci_slot *slot = mmc_priv(mmc); struct dw_mci *host = slot->host; + const struct dw_mci_drv_data *drv_data = host->drv_data; + + if (drv_data && drv_data->hw_reset) + return drv_data->hw_reset(host); if (host->use_dma == TRANS_MODE_IDMAC) dw_mci_idmac_reset(host); diff --git a/drivers/mmc/host/dw_mmc.h b/drivers/mmc/host/dw_mmc.h index 9df18c1..21b9df4 100644 --- a/drivers/mmc/host/dw_mmc.h +++ b/drivers/mmc/host/dw_mmc.h @@ -282,6 +282,7 @@ struct dw_mci_slot { * @set_ios: handle bus specific extensions. * @parse_dt: parse implementation specific device tree properties. * @execute_tuning: implementation specific tuning procedure. + * @hw_reset: implementation specific hw reset procedure. * * Provide controller implementation specific extensions. The usage of this * data structure is fully optional and usage of each member in this structure @@ -299,5 +300,6 @@ struct dw_mci_drv_data { struct mmc_ios *ios); int (*switch_voltage)(struct mmc_host *mmc, struct mmc_ios *ios); + void (*hw_reset)(struct dw_mci *host); }; #endif /* _DW_MMC_H_ */ -- 2.3.7