linux-kernel - [PATCH 5.4 276/340] misc: rtsx: init of rts522a add OCP power off when no card is present

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Message-Id: <20210301161101.873320278@linuxfoundation.org>
Date:   Mon,  1 Mar 2021 17:13:40 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Ricky Wu <ricky_wu@...ltek.com>
Subject: [PATCH 5.4 276/340] misc: rtsx: init of rts522a add OCP power off when no card is present

From: Ricky Wu <ricky_wu@...ltek.com>

commit 920fd8a70619074eac7687352c8f1c6f3c2a64a5 upstream.

Power down OCP for power consumption
when no SD/MMC card is present

Cc: stable@...r.kernel.org
Signed-off-by: Ricky Wu <ricky_wu@...ltek.com>
Link: https://lore.kernel.org/r/20210204083115.9471-1-ricky_wu@realtek.com
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/misc/cardreader/rts5227.c |    5 +++++
 1 file changed, 5 insertions(+)

--- a/drivers/misc/cardreader/rts5227.c
+++ b/drivers/misc/cardreader/rts5227.c
@@ -338,6 +338,11 @@ static int rts522a_extra_init_hw(struct
 {
 	rts5227_extra_init_hw(pcr);
 
+	/* Power down OCP for power consumption */
+	if (!pcr->card_exist)
+		rtsx_pci_write_register(pcr, FPDCTL, OC_POWER_DOWN,
+				OC_POWER_DOWN);
+
 	rtsx_pci_write_register(pcr, FUNC_FORCE_CTL, FUNC_FORCE_UPME_XMT_DBG,
 		FUNC_FORCE_UPME_XMT_DBG);
 	rtsx_pci_write_register(pcr, PCLK_CTL, 0x04, 0x04);