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Subject[PATCH v3 13/16] mmc: tmio: fix never-detected card insertion bug
Date
The TMIO mmc cannot detect the card insertion in native_hotplug mode
if the driver is probed without a card inserted.

The reason is obvious; all IRQs are disabled by tmio_mmc_host_probe(),
as follows:

tmio_mmc_disable_mmc_irqs(_host, TMIO_MASK_ALL);

The card event IRQs are first enabled by tmio_mmc_start_command() as
follows:

if (!host->native_hotplug)
irq_mask &= ~(TMIO_STAT_CARD_REMOVE | TMIO_STAT_CARD_INSERT);
tmio_mmc_enable_mmc_irqs(host, irq_mask);

If the driver is probed without a card, tmio_mmc_start_command() is
never called in the first place. So, the card is never detected.

The card event IRQs must be enabled in probe/resume functions.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
---

Changes in v3: None
Changes in v2:
- Newly added

drivers/mmc/host/tmio_mmc_core.c | 12 ++++++++----
1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/drivers/mmc/host/tmio_mmc_core.c b/drivers/mmc/host/tmio_mmc_core.c
index b20d5c5..0e3dc8c 100644
--- a/drivers/mmc/host/tmio_mmc_core.c
+++ b/drivers/mmc/host/tmio_mmc_core.c
@@ -350,8 +350,6 @@ static int tmio_mmc_start_command(struct tmio_mmc_host *host,
c |= TRANSFER_READ;
}

- if (!host->native_hotplug)
- irq_mask &= ~(TMIO_STAT_CARD_REMOVE | TMIO_STAT_CARD_INSERT);
tmio_mmc_enable_mmc_irqs(host, irq_mask);

/* Fire off the command */
@@ -1294,11 +1292,13 @@ int tmio_mmc_host_probe(struct tmio_mmc_host *_host)
irq_mask |= TMIO_MASK_READOP;
if (!_host->chan_tx)
irq_mask |= TMIO_MASK_WRITEOP;
- if (!_host->native_hotplug)
- irq_mask &= ~(TMIO_STAT_CARD_REMOVE | TMIO_STAT_CARD_INSERT);

_host->sdcard_irq_mask &= ~irq_mask;

+ if (_host->native_hotplug)
+ tmio_mmc_enable_mmc_irqs(_host,
+ TMIO_STAT_CARD_REMOVE | TMIO_STAT_CARD_INSERT);
+
spin_lock_init(&_host->lock);
mutex_init(&_host->ios_lock);

@@ -1382,6 +1382,10 @@ int tmio_mmc_host_runtime_resume(struct device *dev)
if (host->clk_cache)
tmio_mmc_set_clock(host, host->clk_cache);

+ if (host->native_hotplug)
+ tmio_mmc_enable_mmc_irqs(host,
+ TMIO_STAT_CARD_REMOVE | TMIO_STAT_CARD_INSERT);
+
tmio_mmc_enable_dma(host, true);

if (tmio_mmc_can_retune(host) && host->select_tuning(host))
--
2.7.4
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