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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: Ludovic Barre <ludovic.barre@st.com>
Link: https://lore.kernel.org/r/20200128090636.13689-8-ludovic.barre@st.com
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Ludovic Barre 2020-01-28 10:06:34 +01:00 committed by Ulf Hansson
parent 1103f807a3
commit 7577316528
2 changed files with 10 additions and 0 deletions
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8
drivers/mmc/host/mmci.c
View File

@ -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");
}

2
drivers/mmc/host/mmci.h
View File

@ -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 {