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mmc: sdhci-uhs2: add reset function

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Sdhci_uhs2_reset() does a UHS-II specific reset operation.

Signed-off-by: Ben Chuang <ben.chuang@genesyslogic.com.tw>
Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
Signed-off-by: Victor Shih <victor.shih@genesyslogic.com.tw>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Message-ID: <20241018105333.4569-6-victorshihgli@gmail.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Victor Shih 2024-10-18 18:53:22 +08:00 committed by Ulf Hansson
parent 0f8186f146
commit 9b1c779d86
2 changed files with 38 additions and 0 deletions
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37
drivers/mmc/host/sdhci-uhs2.c
View File

@ -10,7 +10,9 @@
* Author: AKASHI Takahiro <takahiro.akashi@linaro.org>
*/
#include <linux/delay.h>
#include <linux/module.h>
#include <linux/iopoll.h>
#include "sdhci.h"
#include "sdhci-uhs2.h"
@ -21,6 +23,8 @@
#define SDHCI_UHS2_DUMP(f, x...) \
pr_err("%s: " DRIVER_NAME ": " f, mmc_hostname(host->mmc), ## x)
#define UHS2_RESET_TIMEOUT_100MS 100000
void sdhci_uhs2_dump_regs(struct sdhci_host *host)
{
if (!(mmc_card_uhs2(host->mmc)))
@ -49,6 +53,39 @@ void sdhci_uhs2_dump_regs(struct sdhci_host *host)
}
EXPORT_SYMBOL_GPL(sdhci_uhs2_dump_regs);
/*****************************************************************************\
* *
* Low level functions *
* *
\*****************************************************************************/
/**
* sdhci_uhs2_reset - invoke SW reset
* @host: SDHCI host
* @mask: Control mask
*
* Invoke SW reset, depending on a bit in @mask and wait for completion.
*/
void sdhci_uhs2_reset(struct sdhci_host *host, u16 mask)
{
u32 val;
sdhci_writew(host, mask, SDHCI_UHS2_SW_RESET);
if (mask & SDHCI_UHS2_SW_RESET_FULL)
host->clock = 0;
/* hw clears the bit when it's done */
if (read_poll_timeout_atomic(sdhci_readw, val, !(val & mask), 10,
UHS2_RESET_TIMEOUT_100MS, true, host, SDHCI_UHS2_SW_RESET)) {
pr_warn("%s: %s: Reset 0x%x never completed. %s: clean reset bit.\n", __func__,
mmc_hostname(host->mmc), (int)mask, mmc_hostname(host->mmc));
sdhci_writeb(host, 0, SDHCI_UHS2_SW_RESET);
return;
}
}
EXPORT_SYMBOL_GPL(sdhci_uhs2_reset);
/*****************************************************************************\
* *
* Driver init/exit *

1
drivers/mmc/host/sdhci-uhs2.h
View File

@ -175,5 +175,6 @@
struct sdhci_host;
void sdhci_uhs2_dump_regs(struct sdhci_host *host);
void sdhci_uhs2_reset(struct sdhci_host *host, u16 mask);
#endif /* __SDHCI_UHS2_H */