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From: <ricky_wu@realtek.com>
To: <ulf.hansson@linaro.org>, <ricky_wu@realtek.com>,
	<gregkh@linuxfoundation.org>, <feng@realsil.com.cn>,
	<dianders@chromium.org>, <lee.jones@linaro.org>,
	<linux-mmc@vger.kernel.org>, <linux-kernel@vger.kernel.org>
Subject: [PATCH 1/2] mmc: rtsx: add delay before power on
Date: Wed, 13 Jan 2021 18:57:23 +0800	[thread overview]
Message-ID: <20210113105723.7916-1-ricky_wu@realtek.com> (raw)

From: Ricky Wu <ricky_wu@realtek.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@realtek.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


             reply	other threads:[~2021-01-13 10:58 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-01-13 10:57 ricky_wu [this message]
2021-01-13 13:07 ` [PATCH 1/2] mmc: rtsx: add delay before power on Ulf Hansson
  -- strict thread matches above, loose matches on Subject: below --
2020-12-30  9:04 ricky_wu
2021-01-13  9:58 ` Ulf Hansson
2021-01-13 10:20   ` 吳昊澄 Ricky

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