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X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: leon.chen@mediatek.com, andy.teng@mediatek.com, chun-hung.wu@mediatek.com, kuohong.wang@mediatek.com, linux-kernel@vger.kernel.org, linux-mediatek@lists.infradead.org, peter.wang@mediatek.com, Stanley Chu , linux-arm-kernel@lists.infradead.org, beanhuo@micron.com Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org Add device reset vops implementation in MediaTek UFS driver. Signed-off-by: Stanley Chu --- drivers/scsi/ufs/ufs-mediatek.c | 27 +++++++++++++++++++++++++++ drivers/scsi/ufs/ufs-mediatek.h | 7 +++++++ 2 files changed, 34 insertions(+) diff --git a/drivers/scsi/ufs/ufs-mediatek.c b/drivers/scsi/ufs/ufs-mediatek.c index 83e28edc3ac5..6a3ec11b16db 100644 --- a/drivers/scsi/ufs/ufs-mediatek.c +++ b/drivers/scsi/ufs/ufs-mediatek.c @@ -6,10 +6,12 @@ * Peter Wang */ +#include #include #include #include #include +#include #include "ufshcd.h" #include "ufshcd-pltfrm.h" @@ -269,6 +271,30 @@ static int ufs_mtk_link_startup_notify(struct ufs_hba *hba, return ret; } +static void ufs_mtk_device_reset(struct ufs_hba *hba) +{ + struct arm_smccc_res res; + + arm_smccc_smc(MTK_SIP_UFS_CONTROL, UFS_MTK_SIP_DEVICE_RESET, + 0, 0, 0, 0, 0, 0, &res); + /* + * The reset signal is active low. UFS devices shall detect + * more than or equal to 1us of positive or negative RST_n + * pulse width. + * + * To be on safe side, keep the reset low for at least 10us. + */ + usleep_range(10, 15); + + arm_smccc_smc(MTK_SIP_UFS_CONTROL, UFS_MTK_SIP_DEVICE_RESET, + 1, 0, 0, 0, 0, 0, &res); + + /* Some devices may need time to respond to rst_n */ + usleep_range(10000, 15000); + + dev_info(hba->dev, "device reset done\n"); +} + static int ufs_mtk_suspend(struct ufs_hba *hba, enum ufs_pm_op pm_op) { struct ufs_mtk_host *host = ufshcd_get_variant(hba); @@ -303,6 +329,7 @@ static struct ufs_hba_variant_ops ufs_hba_mtk_vops = { .pwr_change_notify = ufs_mtk_pwr_change_notify, .suspend = ufs_mtk_suspend, .resume = ufs_mtk_resume, + .device_reset = ufs_mtk_device_reset, }; /** diff --git a/drivers/scsi/ufs/ufs-mediatek.h b/drivers/scsi/ufs/ufs-mediatek.h index 19f8c42fe06f..b03f601d3a9e 100644 --- a/drivers/scsi/ufs/ufs-mediatek.h +++ b/drivers/scsi/ufs/ufs-mediatek.h @@ -6,6 +6,8 @@ #ifndef _UFS_MEDIATEK_H #define _UFS_MEDIATEK_H +#include + /* * Vendor specific pre-defined parameters */ @@ -29,6 +31,11 @@ #define VS_SAVEPOWERCONTROL 0xD0A6 #define VS_UNIPROPOWERDOWNCONTROL 0xD0A8 +/* + * SiP commands + */ +#define UFS_MTK_SIP_DEVICE_RESET BIT(1) + /* * VS_DEBUGCLOCKENABLE */ -- 2.18.0 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel