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
next reply other threads:[~2022-02-22 7:28 UTC|newest]
Thread overview: 8+ 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
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