linux-kernel - [PATCH 7/8] misc: rtsx: Add hardware auto power off for RTS5261

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Date:   Tue, 3 Nov 2020 17:55:12 +0800
From:   <rui_feng@...lsil.com.cn>
To:     <arnd@...db.de>, <gregkh@...uxfoundation.org>,
        <ulf.hansson@...aro.org>
CC:     <linux-kernel@...r.kernel.org>, <linux-mmc@...r.kernel.org>,
        Rui Feng <rui_feng@...lsil.com.cn>
Subject: [PATCH 7/8] misc: rtsx: Add hardware auto power off for RTS5261

From: Rui Feng <rui_feng@...lsil.com.cn>

This patch enable hardware auto power off when card is removed.

Signed-off-by: Rui Feng <rui_feng@...lsil.com.cn>
---
 drivers/misc/cardreader/rts5261.c | 9 +++++++++
 include/linux/rtsx_pci.h          | 3 +++
 2 files changed, 12 insertions(+)

diff --git a/drivers/misc/cardreader/rts5261.c b/drivers/misc/cardreader/rts5261.c
index 0ef6b3e04a8d..2ada973a0f33 100644
--- a/drivers/misc/cardreader/rts5261.c
+++ b/drivers/misc/cardreader/rts5261.c
@@ -176,6 +176,8 @@ static int rts5261_card_power_on(struct rtsx_pcr *pcr, int card)
 	if (option->ocp_en)
 		rtsx_pci_enable_ocp(pcr);
 
+	rtsx_pci_write_register(pcr, REG_CRC_DUMMY_0,
+		CFG_SD_POW_AUTO_PD, CFG_SD_POW_AUTO_PD);
 
 	rtsx_pci_write_register(pcr, RTS5261_LDO1_CFG1,
 			RTS5261_LDO1_TUNE_MASK, RTS5261_LDO1_33);
@@ -303,6 +305,8 @@ static int rts5261_card_power_off(struct rtsx_pcr *pcr, int card)
 	err = rtsx_pci_write_register(pcr, RTS5261_LDO1233318_POW_CTL,
 				RTS5261_LDO_POWERON_MASK, 0);
 
+	rtsx_pci_write_register(pcr, REG_CRC_DUMMY_0,
+		CFG_SD_POW_AUTO_PD, 0);
 	if (pcr->option.ocp_en)
 		rtsx_pci_disable_ocp(pcr);
 
@@ -475,6 +479,7 @@ static void rts5261_init_from_cfg(struct rtsx_pcr *pcr)
 static int rts5261_extra_init_hw(struct rtsx_pcr *pcr)
 {
 	struct rtsx_cr_option *option = &pcr->option;
+	u32 val;
 
 	rtsx_pci_write_register(pcr, RTS5261_AUTOLOAD_CFG1,
 			CD_RESUME_EN_MASK, CD_RESUME_EN_MASK);
@@ -489,6 +494,10 @@ static int rts5261_extra_init_hw(struct rtsx_pcr *pcr)
 			AUX_CLK_ACTIVE_SEL_MASK, MAC_CKSW_DONE);
 	rtsx_pci_write_register(pcr, L1SUB_CONFIG3, 0xFF, 0);
 
+	if (is_version_higher_than(pcr, PID_5261, IC_VER_B)) {
+		val = rtsx_pci_readl(pcr, RTSX_DUM_REG);
+		rtsx_pci_writel(pcr, RTSX_DUM_REG, val | 0x1);
+	}
 	rtsx_pci_write_register(pcr, RTS5261_AUTOLOAD_CFG4,
 			RTS5261_AUX_CLK_16M_EN, 0);
 
diff --git a/include/linux/rtsx_pci.h b/include/linux/rtsx_pci.h
index db249e8707f3..fcaadc7c9df1 100644
--- a/include/linux/rtsx_pci.h
+++ b/include/linux/rtsx_pci.h
@@ -82,6 +82,7 @@
 #define   MS_OC_INT_EN			(1 << 23)
 #define   SD_OC_INT_EN			(1 << 22)
 
+#define RTSX_DUM_REG			0x1C
 
 /*
  * macros for easy use
@@ -1272,6 +1273,8 @@ struct rtsx_pcr {
 #define PCI_PID(pcr)			((pcr)->pci->device)
 #define is_version(pcr, pid, ver)				\
 	(CHK_PCI_PID(pcr, pid) && (pcr)->ic_version == (ver))
+#define is_version_higher_than(pcr, pid, ver)			\
+	(CHK_PCI_PID(pcr, pid) && (pcr)->ic_version > (ver))
 #define pcr_dbg(pcr, fmt, arg...)				\
 	dev_dbg(&(pcr)->pci->dev, fmt, ##arg)
 
-- 
2.17.1