Commit 75773165 authored by Ludovic Barre's avatar Ludovic Barre Committed by Ulf Hansson
Browse files

mmc: mmci: Add callbacks for to manage signal voltage switch 



A variant may need to define some actions before and after a voltage
switch.

This patch adds 2 callbacks to manage signal voltage switch in the struct
mmci_host_ops. ->pre_sig_volt_switch() allows to prepare a signal voltage
switch before sending the SD_SWITCH_VOLTAGE command (CMD11).
->post_sig_volt_switch callback allows specific actions to be executed,
after the I/O signal voltage level has been changed.

Signed-off-by: default avatarLudovic Barre <ludovic.barre@st.com>
Link: https://lore.kernel.org/r/20200128090636.13689-8-ludovic.barre@st.com


Signed-off-by: default avatarUlf Hansson <ulf.hansson@linaro.org>
parent 1103f807

drivers/mmc/host/mmci.c

+8 −0
Original line number Diff line number Diff line
@@ -22,6 +22,7 @@ 
#include <linux/mmc/pm.h>

#include <linux/mmc/host.h>

#include <linux/mmc/card.h>

#include <linux/mmc/sd.h>

#include <linux/mmc/slot-gpio.h>

#include <linux/amba/bus.h>

#include <linux/clk.h>
@@ -1217,6 +1218,9 @@ mmci_start_command(struct mmci_host *host, struct mmc_command *cmd, u32 c) 
		writel_relaxed(clks, host->base + MMCIDATATIMER);

	}



	if (host->ops->pre_sig_volt_switch && cmd->opcode == SD_SWITCH_VOLTAGE)

		host->ops->pre_sig_volt_switch(host);



	if (/*interrupt*/0)

		c |= MCI_CPSM_INTERRUPT;
@@ -1830,6 +1834,7 @@ static int mmci_get_cd(struct mmc_host *mmc) 


static int mmci_sig_volt_switch(struct mmc_host *mmc, struct mmc_ios *ios)

{

	struct mmci_host *host = mmc_priv(mmc);

	int ret = 0;



	if (!IS_ERR(mmc->supply.vqmmc)) {
@@ -1849,6 +1854,9 @@ static int mmci_sig_volt_switch(struct mmc_host *mmc, struct mmc_ios *ios) 
			break;

		}



		if (!ret && host->ops && host->ops->post_sig_volt_switch)

			ret = host->ops->post_sig_volt_switch(host, ios);



		if (ret)

			dev_warn(mmc_dev(mmc), "Voltage switch failed\n");

	}

drivers/mmc/host/mmci.h

+2 −0
Original line number Diff line number Diff line
@@ -377,6 +377,8 @@ struct mmci_host_ops { 
	void (*set_clkreg)(struct mmci_host *host, unsigned int desired);

	void (*set_pwrreg)(struct mmci_host *host, unsigned int pwr);

	bool (*busy_complete)(struct mmci_host *host, u32 status, u32 err_msk);

	void (*pre_sig_volt_switch)(struct mmci_host *host);

	int (*post_sig_volt_switch)(struct mmci_host *host, struct mmc_ios *ios);

};



struct mmci_host {

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