linux-kernel - [PATCH v4 1/2] mmc: sdhci: export sdhci_execute

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Date:   Mon,  5 Dec 2016 11:10:53 +0900
From:   Masahiro Yamada <yamada.masahiro@...ionext.com>
To:     linux-mmc@...r.kernel.org
Cc:     Adrian Hunter <adrian.hunter@...el.com>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        linux-kernel@...r.kernel.org
Subject: [PATCH v4 1/2] mmc: sdhci: export sdhci_execute_tuning()

Some SDHCI-compat controllers support not only SD, but also eMMC,
but they use different commands for tuning: CMD19 for SD, CMD21 for
eMMC.

Due to the difference of the underlying mechanism, some controllers
(at least, the Cadence IP is the case) provide their own registers
for the eMMC tuning.

This commit will be useful when we want to override .execute_tuning
callback (for eMMC HS200 tuning), but still let it fall back to
sdhci_execute_tuning() for SD timing.

Signed-off-by: Masahiro Yamada <yamada.masahiro@...ionext.com>
---

I want to use this in the next commit.
The Cadence IP supports eMMC as well as SD.

I want to re-use the sdhci_execute_tuning() for SD timing.

On the other hand, Cadence provides its own way for eMMC HS200 tuning;
I need to touch some registers that are specific to Cadence's design.


Changes in v4:
  - export sdhci_execute_tuning() instead of using
    execute_execute_tuning()

Changes in v3: None
Changes in v2: None

 drivers/mmc/host/sdhci.c | 3 ++-
 drivers/mmc/host/sdhci.h | 1 +
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index 42ef3eb..0c03a89 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -1948,7 +1948,7 @@ static int sdhci_prepare_hs400_tuning(struct mmc_host *mmc, struct mmc_ios *ios)
 	return 0;
 }
 
-static int sdhci_execute_tuning(struct mmc_host *mmc, u32 opcode)
+int sdhci_execute_tuning(struct mmc_host *mmc, u32 opcode)
 {
 	struct sdhci_host *host = mmc_priv(mmc);
 	u16 ctrl;
@@ -2141,6 +2141,7 @@ static int sdhci_execute_tuning(struct mmc_host *mmc, u32 opcode)
 	spin_unlock_irqrestore(&host->lock, flags);
 	return err;
 }
+EXPORT_SYMBOL_GPL(sdhci_execute_tuning);
 
 static int sdhci_select_drive_strength(struct mmc_card *card,
 				       unsigned int max_dtr, int host_drv,
diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h
index 9c35776..786eee9 100644
--- a/drivers/mmc/host/sdhci.h
+++ b/drivers/mmc/host/sdhci.h
@@ -689,6 +689,7 @@ void sdhci_set_power_noreg(struct sdhci_host *host, unsigned char mode,
 void sdhci_set_bus_width(struct sdhci_host *host, int width);
 void sdhci_reset(struct sdhci_host *host, u8 mask);
 void sdhci_set_uhs_signaling(struct sdhci_host *host, unsigned timing);
+int sdhci_execute_tuning(struct mmc_host *mmc, u32 opcode);
 
 #ifdef CONFIG_PM
 extern int sdhci_suspend_host(struct sdhci_host *host);
-- 
2.7.4