Re: [PATCH v2 3/3] media: platform: meson-ao-cec-g12a: add wakeup support

guillaume La Roque
2020-01-10T15:06:42Z

Hi Hans,

On 1/7/20 3:36 PM, Hans Verkuil wrote:
> Hi Guillaume,
>
> On 12/13/19 2:29 PM, Guillaume La Roque wrote:
>> add register configuration to activate wakeup feature in bl301
>>
>> Tested-by: Kevin Hilman <khilman@baylibre.com>
>> Signed-off-by: Guillaume La Roque <glaroque@baylibre.com>
>> ---
>> drivers/media/platform/meson/ao-cec-g12a.c | 33 ++++++++++++++++++++++
>> 1 file changed, 33 insertions(+)
>>
>> diff --git a/drivers/media/platform/meson/ao-cec-g12a.c b/drivers/media/platform/meson/ao-cec-g12a.c
>> index 891533060d49..85850b974126 100644
>> --- a/drivers/media/platform/meson/ao-cec-g12a.c
>> +++ b/drivers/media/platform/meson/ao-cec-g12a.c
>> @@ -25,6 +25,7 @@
>> #include <media/cec.h>
>> #include <media/cec-notifier.h>
>> #include <linux/clk-provider.h>
>> +#include <linux/mfd/syscon.h>
>>
>> /* CEC Registers */
>>
>> @@ -168,6 +169,18 @@
>>
>> #define CECB_WAKEUPCTRL 0x31
>>
>> +#define CECB_FUNC_CFG_REG 0xA0
>> +#define CECB_FUNC_CFG_MASK GENMASK(6, 0)
>> +#define CECB_FUNC_CFG_CEC_ON 0x01
>> +#define CECB_FUNC_CFG_OTP_ON 0x02
>> +#define CECB_FUNC_CFG_AUTO_STANDBY 0x04
>> +#define CECB_FUNC_CFG_AUTO_POWER_ON 0x08
>> +#define CECB_FUNC_CFG_ALL 0x2f
>> +#define CECB_FUNC_CFG_NONE 0x0
>> +
>> +#define CECB_LOG_ADDR_REG 0xA4
>> +#define CECB_LOG_ADDR_MASK GENMASK(22, 16)
>> +
>> struct meson_ao_cec_g12a_data {
>> /* Setup the internal CECB_CTRL2 register */
>> bool ctrl2_setup;
>> @@ -177,6 +190,7 @@ struct meson_ao_cec_g12a_device {
>> struct platform_device *pdev;
>> struct regmap *regmap;
>> struct regmap *regmap_cec;
>> + struct regmap *regmap_ao_sysctrl;
>> spinlock_t cec_reg_lock;
>> struct cec_notifier *notify;
>> struct cec_adapter *adap;
>> @@ -518,6 +532,13 @@ meson_ao_cec_g12a_set_log_addr(struct cec_adapter *adap, u8 logical_addr)
>> BIT(logical_addr - 8));
>> }
>>
>> + if (ao_cec->regmap_ao_sysctrl)
>> + ret |= regmap_update_bits(ao_cec->regmap_ao_sysctrl,
>> + CECB_LOG_ADDR_REG,
>> + CECB_LOG_ADDR_MASK,
>> + FIELD_PREP(CECB_LOG_ADDR_MASK,
>> + logical_addr));
>> +
>> /* Always set Broadcast/Unregistered 15 address */
>> ret |= regmap_update_bits(ao_cec->regmap_cec, CECB_LADD_HIGH,
>> BIT(CEC_LOG_ADDR_UNREGISTERED - 8),
>> @@ -618,6 +639,13 @@ static int meson_ao_cec_g12a_adap_enable(struct cec_adapter *adap, bool enable)
>> regmap_write(ao_cec->regmap_cec, CECB_CTRL2,
>> FIELD_PREP(CECB_CTRL2_RISE_DEL_MAX, 2));
>>
>> + if (ao_cec->regmap_ao_sysctrl) {
>> + regmap_update_bits(ao_cec->regmap_ao_sysctrl,
>> + CECB_FUNC_CFG_REG,
>> + CECB_FUNC_CFG_MASK,
>> + CECB_FUNC_CFG_ALL);
> What exactly is enabled here? Looking at CECB_FUNC_CFG_ALL it seems to
> enable automatic standby (I presume when the STANDBY message is received?)
> and power on (I presume when SET_STREAM_PATH is received?).
this register and flags are used by bl301 part.

amlogic implemented a task to check cec event/message.

for power on in bl301 it's not only on SET_STREAM_PATH but also on :

USER_CONTROL_PRESSED
TEXT_VIEW_ON
ACTIVE_SOURCE
ROUTING_CHANGE

when in CECB_FUNC_CFG_REG register we put  CECB_FUNC_CFG_CEC_ON and  CECB_FUNC_CFG_AUTO_POWER_ON

it's not possible to change this

>
> Do you really want to automatically handle STANDBY that way? What does this
> do on the hardware level anyway? Isn't this something that should be
> controlled in userspace?

in fact i do a new check in bl301 code amlogic do nothing on STANDBY so i will clean code

and activate real option supported by bl301

>
> Similar questions for power on: you may not always want to enable this feature
> since it depends very much on the precise use-case.
>
> And which messages it reacts to in order to do a power-on needs to be
> documented since this differs depending on whether the CEC adapter is
> used for a TV or for a playback device. This feature may be hardwired for
> a playback device only, in which case it should probably be disabled if
> the CEC adapter is configured as a TV.
>
> In any case I would like to see some more details about how this works,
> especially since this is the first implementation of such a feature.
>
> I suspect that some userspace API might be needed to get the right level
> of control of such a feature.

i will send v3 next week with some comments and fix ( disable are missing for example)

actual usercase is for android TV.

when cec was enable android TV want to be wakeup by cec event.

> Regards,
>
> Hans
>

thanks for your review

Regards

Guillaume

>> + }
>> +
>> meson_ao_cec_g12a_irq_setup(ao_cec, true);
>>
>> return 0;
>> @@ -685,6 +713,11 @@ static int meson_ao_cec_g12a_probe(struct platform_device *pdev)
>> goto out_probe_adapter;
>> }
>>
>> + ao_cec->regmap_ao_sysctrl = syscon_regmap_lookup_by_phandle
>> + (pdev->dev.of_node, "amlogic,ao-sysctrl");
>> + if (IS_ERR(ao_cec->regmap_ao_sysctrl))
>> + dev_warn(&pdev->dev, "ao-sysctrl syscon regmap lookup failed.\n");
>> +
>> irq = platform_get_irq(pdev, 0);
>> ret = devm_request_threaded_irq(&pdev->dev, irq,
>> meson_ao_cec_g12a_irq,
>>