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| author | Jae Hyun Yoo <jae.hyun.yoo@intel.com> | 2019-07-12 00:04:39 +0300 |
|---|---|---|
| committer | Jae Hyun Yoo <jae.hyun.yoo@linux.intel.com> | 2021-11-05 10:22:08 +0300 |
| commit | e5a672c1c0e433d986acbb21af8ebb7a92e51554 (patch) | |
| tree | a4e669613af5aec13991748876a2c087e4d7e3df /drivers/i2c | |
| parent | ba4c2f110fac5748ec409eff41f5c457e68826de (diff) | |
| download | linux-e5a672c1c0e433d986acbb21af8ebb7a92e51554.tar.xz | |
i2c: aspeed: add SLAVE_ADDR_RECEIVED_PENDING interrupt handling
If a peer master sends messages too quickly before it processes
previous slave DMA data handling, this indicator will be set. It's
just a indicator and driver can't recover this case so just ignore
it.
Signed-off-by: Jae Hyun Yoo <jae.hyun.yoo@intel.com>
Diffstat (limited to 'drivers/i2c')
| -rw-r--r-- | drivers/i2c/busses/i2c-aspeed.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/drivers/i2c/busses/i2c-aspeed.c b/drivers/i2c/busses/i2c-aspeed.c index f5a7a008270c..1354e2b04cdf 100644 --- a/drivers/i2c/busses/i2c-aspeed.c +++ b/drivers/i2c/busses/i2c-aspeed.c @@ -88,6 +88,7 @@ * status bits. */ #define ASPEED_I2CD_INTR_RECV_MASK 0xf000ffff +#define ASPEED_I2CD_INTR_SLAVE_ADDR_RECEIVED_PENDING BIT(30) #define ASPEED_I2CD_INTR_SLAVE_INACTIVE_TIMEOUT BIT(15) #define ASPEED_I2CD_INTR_SDA_DL_TIMEOUT BIT(14) #define ASPEED_I2CD_INTR_BUS_RECOVER_DONE BIT(13) @@ -472,6 +473,18 @@ static u32 aspeed_i2c_slave_irq(struct aspeed_i2c_bus *bus, u32 irq_status) dev_dbg(bus->dev, "slave irq status 0x%08x, cmd 0x%08x\n", irq_status, command); + /* + * If a peer master sends messages too quickly before it processes + * previous slave DMA data handling, this indicator will be set. It's + * just a indicator and driver can't recover this case so just ignore + * it. + */ + if (unlikely(irq_status & + ASPEED_I2CD_INTR_SLAVE_ADDR_RECEIVED_PENDING)) { + dev_dbg(bus->dev, "A slave addr match interrupt is pending.\n"); + irq_handled |= ASPEED_I2CD_INTR_SLAVE_ADDR_RECEIVED_PENDING; + } + /* Slave was sent something. */ if (irq_status & ASPEED_I2CD_INTR_RX_DONE) { aspeed_i2c_slave_handle_rx_done(bus, irq_status, &value); |