This commit introduces interrupt-based card detection, identical to the `rts5139` driver in staging.
This mechanism fixes presence detection for certain card readers, which with the current driver, will take approximately 20 seconds to enter S3 as `mmc_rescan` has to be frozen.
Cc: stable@vger.kernel.org Cc: Arnd Bergmann arnd@arndb.de Cc: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Sean Rhodes sean@starlabs.systems --- drivers/misc/cardreader/rtsx_usb.c | 15 +++++++++++++++ 1 file changed, 15 insertions(+)
diff --git a/drivers/misc/cardreader/rtsx_usb.c b/drivers/misc/cardreader/rtsx_usb.c index f150d8769f19..285a748748d7 100644 --- a/drivers/misc/cardreader/rtsx_usb.c +++ b/drivers/misc/cardreader/rtsx_usb.c @@ -286,6 +286,7 @@ static int rtsx_usb_get_status_with_bulk(struct rtsx_ucr *ucr, u16 *status) int rtsx_usb_get_card_status(struct rtsx_ucr *ucr, u16 *status) { int ret; + u8 interrupt_val = 0; u16 *buf;
if (!status) @@ -308,6 +309,20 @@ int rtsx_usb_get_card_status(struct rtsx_ucr *ucr, u16 *status) ret = rtsx_usb_get_status_with_bulk(ucr, status); }
+ rtsx_usb_read_register(ucr, CARD_INT_PEND, &interrupt_val); + /* Cross check presence with interrupts */ + if (*status & XD_CD) + if (!(interrupt_val & XD_INT)) + *status &= ~XD_CD; + + if (*status & SD_CD) + if (!(interrupt_val & SD_INT)) + *status &= ~SD_CD; + + if (*status & MS_CD) + if (!(interrupt_val & MS_INT)) + *status &= ~MS_CD; + /* usb_control_msg may return positive when success */ if (ret < 0) return ret;