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authorMårten Lindahl <marten.lindahl@axis.com>2021-08-16 16:23:14 +0200
committerUlf Hansson <ulf.hansson@linaro.org>2021-08-24 15:16:08 +0200
commit4850c225dd0e82c8aff8fe4bddc183c37551ede9 (patch)
tree7053e429c7ca82162cbe9f1708940daa384bc37b /drivers/mmc
parentf4ff24f8a7c144e6d2107a2f2d16bcd9e2b2578f (diff)
downloadlwn-4850c225dd0e82c8aff8fe4bddc183c37551ede9.tar.gz
lwn-4850c225dd0e82c8aff8fe4bddc183c37551ede9.zip
mmc: usdhi6rol0: Implement card_busy function
When switching card voltage to UHS voltage the mmc framework tries to check the card busy signal, meaning the card pulling DAT0 line low, before the switch is made. Drivers that does not implement the card_busy function will manage to do the switch anyway, but the framework will print a warning about not being able to verify the voltage signal. Implement card_busy function. Signed-off-by: Mårten Lindahl <marten.lindahl@axis.com> Link: https://lore.kernel.org/r/20210816142314.1168-1-marten.lindahl@axis.com Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Diffstat (limited to 'drivers/mmc')
-rw-r--r--drivers/mmc/host/usdhi6rol0.c10
1 files changed, 10 insertions, 0 deletions
diff --git a/drivers/mmc/host/usdhi6rol0.c b/drivers/mmc/host/usdhi6rol0.c
index e34a5e6d69a2..99515be6e5e5 100644
--- a/drivers/mmc/host/usdhi6rol0.c
+++ b/drivers/mmc/host/usdhi6rol0.c
@@ -1186,6 +1186,15 @@ static int usdhi6_sig_volt_switch(struct mmc_host *mmc, struct mmc_ios *ios)
return ret;
}
+static int usdhi6_card_busy(struct mmc_host *mmc)
+{
+ struct usdhi6_host *host = mmc_priv(mmc);
+ u32 tmp = usdhi6_read(host, USDHI6_SD_INFO2);
+
+ /* Card is busy if it is pulling dat[0] low */
+ return !(tmp & USDHI6_SD_INFO2_SDDAT0);
+}
+
static const struct mmc_host_ops usdhi6_ops = {
.request = usdhi6_request,
.set_ios = usdhi6_set_ios,
@@ -1193,6 +1202,7 @@ static const struct mmc_host_ops usdhi6_ops = {
.get_ro = usdhi6_get_ro,
.enable_sdio_irq = usdhi6_enable_sdio_irq,
.start_signal_voltage_switch = usdhi6_sig_volt_switch,
+ .card_busy = usdhi6_card_busy,
};
/* State machine handlers */