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media: platform: stm32: wait end of transmission 

It is mandatory to write CEC_CFGR only when CECEN=0. To protect
transmission, a check have been added to delayed logical address
modification. This patch is necessary tp pass all tests of compliance.

Signed-off-by: Yannick Fertré <yannick.fertre@st.com>
Reviewed-by: Benjamin Gaignard <benjamin.gaignard@linaro.org>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
This commit is contained in:
Yannick Fertre 2019-03-29 08:39:42 -04:00 committed by Mauro Carvalho Chehab
parent b063474e21
commit 1a726df607
1 changed files with 11 additions and 0 deletions
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11
drivers/media/platform/stm32/stm32-cec.c
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@ -56,6 +56,13 @@
#define ALL_TX_IT (TXEND | TXBR | TXACKE | TXERR | TXUDR | ARBLST)
#define ALL_RX_IT (RXEND | RXBR | RXACKE | RXOVR)
/*
* 400 ms is the time it takes for one 16 byte message to be
* transferred and 5 is the maximum number of retries. Add
* another 100 ms as a margin.
*/
#define CEC_XFER_TIMEOUT_MS (5 * 400 + 100)
struct stm32_cec {
struct cec_adapter *adap;
struct device *dev;
@ -188,7 +195,11 @@ static int stm32_cec_adap_log_addr(struct cec_adapter *adap, u8 logical_addr)
{
struct stm32_cec *cec = adap->priv;
u32 oar = (1 << logical_addr) << 16;
u32 val;
/* Poll every 100µs the register CEC_CR to wait end of transmission */
regmap_read_poll_timeout(cec->regmap, CEC_CR, val, !(val & TXSOM),
100, CEC_XFER_TIMEOUT_MS * 1000);
regmap_update_bits(cec->regmap, CEC_CR, CECEN, 0);
if (logical_addr == CEC_LOG_ADDR_INVALID)