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media: allegro: fix reset if WAKEUP has not been set properly 

The Zynq UltraScale+ Devices Register Reference states that the WAKEUP
bit "should be set to 0 after the MCU sleep status bit gets back to 0."
If this is not done, the mcu is not going to sleep on reset and fail the
reset.

Set WAKEUP to 0 before triggering a reset to make sure that the reset is
successful.

Signed-off-by: Michael Tretter <m.tretter@pengutronix.de>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
This commit is contained in:
Michael Tretter 2020-03-16 16:26:27 +01:00 committed by Mauro Carvalho Chehab
parent c32c815503
commit dfba38c841
1 changed files with 8 additions and 0 deletions
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8
drivers/staging/media/allegro-dvt/allegro-core.c
View File

@ -1990,6 +1990,14 @@ static int allegro_mcu_reset(struct allegro_dev *dev)
{
int err;
/*
* Ensure that the AL5_MCU_WAKEUP bit is set to 0 otherwise the mcu
* does not go to sleep after the reset.
*/
err = regmap_write(dev->regmap, AL5_MCU_WAKEUP, 0);
if (err)
return err;
err = regmap_write(dev->regmap,
AL5_MCU_RESET_MODE, AL5_MCU_RESET_MODE_SLEEP);
if (err < 0)