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Re: [Qemu-devel] [PATCH 1/3] aspeed/i2c: interrupts should be cleared by


From: Cédric Le Goater
Subject: Re: [Qemu-devel] [PATCH 1/3] aspeed/i2c: interrupts should be cleared by software only
Date: Tue, 25 Sep 2018 11:12:52 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.9.1

On 09/25/2018 11:02 AM, Peter Maydell wrote:
> On 14 September 2018 at 07:35, Cédric Le Goater <address@hidden> wrote:
>> and the bus interrupt should be lowered when all interrupts have been
>> cleared. Also, the model does not implement correctly the RX_DONE bit
>> behavior which should be cleared to allow more data to be received.
>> Yet to be fixed.
>>
>> Signed-off-by: Cédric Le Goater <address@hidden>
>> ---
>>  hw/i2c/aspeed_i2c.c | 21 +++++++++++++++++----
>>  1 file changed, 17 insertions(+), 4 deletions(-)
>>
>> diff --git a/hw/i2c/aspeed_i2c.c b/hw/i2c/aspeed_i2c.c
>> index c762c7366ad9..de6b08378675 100644
>> --- a/hw/i2c/aspeed_i2c.c
>> +++ b/hw/i2c/aspeed_i2c.c
>> @@ -52,6 +52,13 @@
>>  #define I2CD_AC_TIMING_REG2     0x08       /* Clock and AC Timing Control 
>> #1 */
>>  #define I2CD_INTR_CTRL_REG      0x0c       /* I2CD Interrupt Control */
>>  #define I2CD_INTR_STS_REG       0x10       /* I2CD Interrupt Status */
>> +
>> +#define   I2CD_INTR_SLAVE_ADDR_MATCH       (0x1 << 31) /* 0: addr1 1: addr2 
>> */
>> +#define   I2CD_INTR_SLAVE_ADDR_RX_PENDING  (0x1 << 30)
>> +/* bits[19-16] Reserved */
>> +
>> +/* All bits below are cleared by writing 1 */
>> +#define   I2CD_INTR_SLAVE_INACTIVE_TIMEOUT (0x1 << 15)
>>  #define   I2CD_INTR_SDA_DL_TIMEOUT         (0x1 << 14)
>>  #define   I2CD_INTR_BUS_RECOVER_DONE       (0x1 << 13)
>>  #define   I2CD_INTR_SMBUS_ALERT            (0x1 << 12) /* Bus [0-3] only */
>> @@ -59,11 +66,16 @@
>>  #define   I2CD_INTR_SMBUS_DEV_ALERT_ADDR   (0x1 << 10) /* Removed */
>>  #define   I2CD_INTR_SMBUS_DEF_ADDR         (0x1 << 9)  /* Removed */
>>  #define   I2CD_INTR_GCALL_ADDR             (0x1 << 8)  /* Removed */
>> -#define   I2CD_INTR_SLAVE_MATCH            (0x1 << 7)  /* use RX_DONE */
>> +#define   I2CD_INTR_SLAVE_ADDR_RX_MATCH    (0x1 << 7)  /* use RX_DONE */
>>  #define   I2CD_INTR_SCL_TIMEOUT            (0x1 << 6)
>>  #define   I2CD_INTR_ABNORMAL               (0x1 << 5)
>>  #define   I2CD_INTR_NORMAL_STOP            (0x1 << 4)
>>  #define   I2CD_INTR_ARBIT_LOSS             (0x1 << 3)
>> +
>> +/*
>> + * TODO: handle correctly I2CD_INTR_RX_DONE which needs to be cleared
>> + * to allow next data to be received.
>> + */
>>  #define   I2CD_INTR_RX_DONE                (0x1 << 2)
> 
> Is this TODO something different from the behaviour involving
> this RX_DONE bit which is fixed in patch 3 in this set ?

no. It's the same but the TODO was not removed. I intended to do
so after a possible merge.

Thanks,

C. 



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