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From: Ricky WU <ricky_wu@realtek.com>
To: "ulf.hansson@linaro.org" <ulf.hansson@linaro.org>,
	Ricky WU <ricky_wu@realtek.com>,
	"gregkh@linuxfoundation.org" <gregkh@linuxfoundation.org>,
	"kai.heng.feng@canonical.com" <kai.heng.feng@canonical.com>,
	"tommyhebb@gmail.com" <tommyhebb@gmail.com>,
	"linux-mmc@vger.kernel.org" <linux-mmc@vger.kernel.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: [PATCH] mmc: rtsx: add 74 Clocks in power on flow
Date: Tue, 22 Feb 2022 07:27:52 +0000	[thread overview]
Message-ID: <fb7cda69c5c244dfa579229ee2f0da83@realtek.com> (raw)

After 1ms stabilizing the voltage time
add "Host provides at least 74 Clocks
before issuing first command" that is
spec definition

Signed-off-by: Ricky Wu <ricky_wu@realtek.com>
---
 drivers/mmc/host/rtsx_pci_sdmmc.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/mmc/host/rtsx_pci_sdmmc.c b/drivers/mmc/host/rtsx_pci_sdmmc.c
index 2a3f14afe9f8..e016d720e453 100644
--- a/drivers/mmc/host/rtsx_pci_sdmmc.c
+++ b/drivers/mmc/host/rtsx_pci_sdmmc.c
@@ -940,10 +940,17 @@ static int sd_power_on(struct realtek_pci_sdmmc *host)
 	if (err < 0)
 		return err;
 
+	mdelay(1);
+
 	err = rtsx_pci_write_register(pcr, CARD_OE, SD_OUTPUT_EN, SD_OUTPUT_EN);
 	if (err < 0)
 		return err;
 
+	/* send init 74 clocks */
+	rtsx_pci_write_register(pcr, SD_BUS_STAT, SD_CLK_TOGGLE_EN, SD_CLK_TOGGLE_EN);
+	mdelay(5);
+	rtsx_pci_write_register(pcr, SD_BUS_STAT, SD_CLK_TOGGLE_EN, 0);
+
 	if (PCI_PID(pcr) == PID_5261) {
 		/*
 		 * If test mode is set switch to SD Express mandatorily,
-- 
2.25.1

             reply	other threads:[~2022-02-22  7:28 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-02-22  7:27 Ricky WU [this message]
2022-02-22  7:42 ` [PATCH] mmc: rtsx: add 74 Clocks in power on flow gregkh
2022-02-22  8:48   ` Ricky WU
2022-02-22  8:59     ` gregkh
2022-02-22 12:31       ` Ricky WU
2022-02-22 14:18         ` gregkh
2022-02-24  5:49           ` Ricky WU
2022-02-28 16:12 ` Ulf Hansson
2022-05-09  9:35   ` Christian Löhle
2022-05-09  9:47     ` gregkh
2022-05-09 10:12       ` Christian Löhle
2022-05-10  9:56         ` Ulf Hansson
2022-05-10 10:21           ` gregkh
2022-05-10 12:08 Christian Löhle
2022-05-10 12:09 ` Christian Löhle
2022-05-10 12:40   ` Greg Kroah-Hartman
2022-05-10 13:00 Christian Löhle
2022-05-10 13:02 ` Christian Löhle
2022-05-13  7:54   ` Greg Kroah-Hartman

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