linux-kernel - [PATCH 1/2] mmc: rtsx: add delay before power on

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Date:   Wed, 13 Jan 2021 18:57:23 +0800
From:   <ricky_wu@...ltek.com>
To:     <ulf.hansson@...aro.org>, <ricky_wu@...ltek.com>,
        <gregkh@...uxfoundation.org>, <feng@...lsil.com.cn>,
        <dianders@...omium.org>, <lee.jones@...aro.org>,
        <linux-mmc@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: [PATCH 1/2] mmc: rtsx: add delay before power on

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

Make sure voltage below 0.5V before power on
when do power cycle
At mmc-core recognition card phase will do
power cycle quickly so our device need at least 100ms
to make voltage down to below 0.5V

Signed-off-by: Ricky Wu <ricky_wu@...ltek.com>
---
 drivers/mmc/host/rtsx_pci_sdmmc.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/mmc/host/rtsx_pci_sdmmc.c b/drivers/mmc/host/rtsx_pci_sdmmc.c
index e6f5bbce5685..0e5043a03965 100644
--- a/drivers/mmc/host/rtsx_pci_sdmmc.c
+++ b/drivers/mmc/host/rtsx_pci_sdmmc.c
@@ -906,6 +906,8 @@ static int sd_power_on(struct realtek_pci_sdmmc *host)
 	if (host->power_state == SDMMC_POWER_ON)
 		return 0;
 
+	msleep(100);
+
 	rtsx_pci_init_cmd(pcr);
 	rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, CARD_SELECT, 0x07, SD_MOD_SEL);
 	rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, CARD_SHARE_MODE,
-- 
2.17.1