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authorLudovic Barre <ludovic.barre@st.com>2020-01-28 10:06:34 +0100
committerUlf Hansson <ulf.hansson@linaro.org>2020-03-24 14:35:40 +0100
commit7577316528816e8e9a49c1b4b5822bacbc62d113 (patch)
tree3f85793c1eb4eb24c06cf282dfd5b36e81da91d0 /drivers/mmc
parentmmc: mmci_sdmmc: Add execute tuning with delay block (diff)
downloadlinux-7577316528816e8e9a49c1b4b5822bacbc62d113.tar.xz
linux-7577316528816e8e9a49c1b4b5822bacbc62d113.zip
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>
Diffstat (limited to 'drivers/mmc')
-rw-r--r--drivers/mmc/host/mmci.c8
-rw-r--r--drivers/mmc/host/mmci.h2
2 files changed, 10 insertions, 0 deletions
diff --git a/drivers/mmc/host/mmci.c b/drivers/mmc/host/mmci.c
index d0a041c9e6cd..24e630183ed4 100644
--- a/drivers/mmc/host/mmci.c
+++ b/drivers/mmc/host/mmci.c
@@ -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");
}
diff --git a/drivers/mmc/host/mmci.h b/drivers/mmc/host/mmci.h
index ddcdfb827996..c3bc0a38d4cb 100644
--- a/drivers/mmc/host/mmci.h
+++ b/drivers/mmc/host/mmci.h
@@ -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 {