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Commit 45251812 authored by Dong Aisheng's avatar Dong Aisheng Committed by Chris Ball
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mmc: sdhci: add hooks for platform specific tuning 



The tuning of some platforms may not follow the standard host control
spec v3.0, e.g. Freescale uSDHC on i.MX6Q/DL.
Add a hook here to allow execute platform specific tuning instead of
standard host controller tuning.

The hook only replaces the tuning process, so it's placed after tuning
checking and before the real tuning process.

Some notes for the tuning hook:
1) it needs handle lock itself if it wants to access host controller
according platform specific implementation.
2) do not need to handle runtime pm since it executes with runtime pm
get already.

Signed-off-by: default avatarDong Aisheng <b29396@freescale.com>
Acked-by: default avatarShawn Guo <shawn.guo@linaro.org>
Signed-off-by: default avatarChris Ball <cjb@laptop.org>
parent d0e04938

drivers/mmc/host/sdhci.c

+8 −0
Original line number Diff line number Diff line
@@ -1875,6 +1875,14 @@ static int sdhci_execute_tuning(struct mmc_host *mmc, u32 opcode) 
		return 0;

	}



	if (host->ops->platform_execute_tuning) {

		spin_unlock(&host->lock);

		enable_irq(host->irq);

		err = host->ops->platform_execute_tuning(host, opcode);

		sdhci_runtime_pm_put(host);

		return err;

	}



	sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2);



	/*

drivers/mmc/host/sdhci.h

+1 −0
Original line number Diff line number Diff line
@@ -288,6 +288,7 @@ struct sdhci_ops { 
	unsigned int    (*get_ro)(struct sdhci_host *host);

	void	(*platform_reset_enter)(struct sdhci_host *host, u8 mask);

	void	(*platform_reset_exit)(struct sdhci_host *host, u8 mask);

	int	(*platform_execute_tuning)(struct sdhci_host *host, u32 opcode);

	int	(*set_uhs_signaling)(struct sdhci_host *host, unsigned int uhs);

	void	(*hw_reset)(struct sdhci_host *host);

	void	(*platform_suspend)(struct sdhci_host *host);