linux-kernel - [PATCH] mmc: rtsx: add 74 Clocks in power on flow

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Message-ID: <fb7cda69c5c244dfa579229ee2f0da83@realtek.com>
Date:   Tue, 22 Feb 2022 07:27:52 +0000
From:   Ricky WU <ricky_wu@...ltek.com>
To:     "ulf.hansson@...aro.org" <ulf.hansson@...aro.org>,
        Ricky WU <ricky_wu@...ltek.com>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "kai.heng.feng@...onical.com" <kai.heng.feng@...onical.com>,
        "tommyhebb@...il.com" <tommyhebb@...il.com>,
        "linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: [PATCH] mmc: rtsx: add 74 Clocks in power on flow

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@...ltek.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