linux-kernel - [RFC PATCH v2 5/6] mmc: sdhci-uhs2: Introduce a uhs2_pre_detect

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Message-Id: <cbbfc14fe23c9cd2541c5307f6a1356332e6bc35.1578560282.git.benchuanggli@gmail.com>
Date:   Thu,  9 Jan 2020 17:15:05 +0800
From:   Ben Chuang <benchuanggli@...il.com>
To:     adrian.hunter@...el.com, ulf.hansson@...aro.org
Cc:     linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org,
        greg.tu@...esyslogic.com.tw, ben.chuang@...esyslogic.com.tw,
        Ben Chuang <benchuanggli@...il.com>
Subject: [RFC PATCH v2 5/6] mmc: sdhci-uhs2: Introduce a uhs2_pre_detect_init function

From: Ben Chuang <ben.chuang@...esyslogic.com.tw>

Introduce a uhs2_pre_detect_init function before detect uhs2 interface.

Signed-off-by: Ben Chuang <ben.chuang@...esyslogic.com.tw>
---
 drivers/mmc/host/sdhci-uhs2.c | 3 +++
 drivers/mmc/host/sdhci.h      | 1 +
 2 files changed, 4 insertions(+)

diff --git a/drivers/mmc/host/sdhci-uhs2.c b/drivers/mmc/host/sdhci-uhs2.c
index e9c42894185a..9f53b7b938b9 100644
--- a/drivers/mmc/host/sdhci-uhs2.c
+++ b/drivers/mmc/host/sdhci-uhs2.c
@@ -506,6 +506,9 @@ int sdhci_uhs2_do_detect_init(struct sdhci_host *host)
 	DBG("%s: begin UHS2 init.\n", __func__);
 	spin_lock_irqsave(&host->lock, flags);
 
+	if (host->ops && host->ops->uhs2_pre_detect_init)
+		host->ops->uhs2_pre_detect_init(host);
+
 	if (sdhci_uhs2_interface_detect(host)) {
 		pr_warn("%s: cannot detect UHS2 interface.\n",
 				mmc_hostname(host->mmc));
diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h
index 7f779ac81931..08ee4c805474 100644
--- a/drivers/mmc/host/sdhci.h
+++ b/drivers/mmc/host/sdhci.h
@@ -906,6 +906,7 @@ struct sdhci_ops {
 	void	(*voltage_switch)(struct sdhci_host *host);
 	void	(*adma_write_desc)(struct sdhci_host *host, void **desc,
 				   dma_addr_t addr, int len, unsigned int cmd);
+	void    (*uhs2_pre_detect_init)(struct sdhci_host *host);
 	void    (*uhs2_post_attach_sd)(struct sdhci_host *host);
 };
 
-- 
2.24.1