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scsi: ufs: host: mediatek: Add DDR_EN setting

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On MT6989 and later platforms, control of DDR_EN has been switched from
SPM to EMI. To prevent abnormal access to DRAM, it is necessary to wait
for 'ddren_ack' or assert 'ddren_urgent' after sending 'ddren_req'.

Introduce the DDR_EN configuration in the UFS initialization flow,
utilizing the assertion of 'ddren_urgent' to maintain performance.

Signed-off-by: Naomi Chu <naomi.chu@mediatek.com>
Link: https://lore.kernel.org/r/20250722030841.1998783-3-peter.wang@mediatek.com
Reviewed-by: Peter Wang <peter.wang@mediatek.com>
Reviewed-by: Chun-Hung Wu <chun-hung.wu@mediatek.com>
Signed-off-by: Peter Wang <peter.wang@mediatek.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Naomi Chu 2025-07-22 11:07:17 +08:00 committed by Martin K. Petersen
parent 2628939396
commit a84a9ba788
2 changed files with 19 additions and 0 deletions
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7
drivers/ufs/host/ufs-mediatek.c
View File

@ -267,6 +267,13 @@ static int ufs_mtk_hce_enable_notify(struct ufs_hba *hba,
ufshcd_writel(hba,
ufshcd_readl(hba, REG_UFS_XOUFS_CTRL) | 0x80,
REG_UFS_XOUFS_CTRL);
/* DDR_EN setting */
if (host->ip_ver >= IP_VER_MT6989) {
ufshcd_rmwl(hba, UFS_MASK(0x7FFF, 8),
0x453000, REG_UFS_MMIO_OPT_CTRL_0);
}
}
return 0;

12
drivers/ufs/host/ufs-mediatek.h
View File

@ -192,4 +192,16 @@ struct ufs_mtk_host {
/* MTK RTT support number */
#define MTK_MAX_NUM_RTT 2
/* UFSHCI MTK ip version value */
enum {
/* UFSHCI 3.1 */
IP_VER_MT6878 = 0x10420200,
/* UFSHCI 4.0 */
IP_VER_MT6897 = 0x10440000,
IP_VER_MT6989 = 0x10450000,
IP_VER_NONE = 0xFFFFFFFF
};
#endif /* !_UFS_MEDIATEK_H */