Chip has known bug which causes I2C client state machine to frequently
enter non-idle mode after chip reset. Let's ask I2C adapter to perform
bus recovery to mitigate this bug.
Signed-off-by: Andrzej Hajda <a.hajda@xxxxxxxxxxx>
---
drivers/gpu/drm/bridge/sil-sii8620.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/drivers/gpu/drm/bridge/sil-sii8620.c b/drivers/gpu/drm/bridge/sil-sii8620.c
index 86789f8918a4..db93e5e0497c 100644
--- a/drivers/gpu/drm/bridge/sil-sii8620.c
+++ b/drivers/gpu/drm/bridge/sil-sii8620.c
@@ -978,6 +978,8 @@ static int sii8620_hw_off(struct sii8620 *ctx)
static void sii8620_hw_reset(struct sii8620 *ctx)
{
+ struct i2c_client *i2c = to_i2c_client(ctx->dev);
+
usleep_range(10000, 20000);
gpiod_set_value(ctx->gpio_reset, 0);
usleep_range(5000, 20000);
@@ -985,6 +987,9 @@ static void sii8620_hw_reset(struct sii8620 *ctx)
usleep_range(10000, 20000);
gpiod_set_value(ctx->gpio_reset, 0);
msleep(300);
+
+ /* I2C bus recovery prevents I2C errors due to known bug in the chip */
+ i2c_recover_bus(i2c->adapter);
}
static void sii8620_cbus_reset(struct sii8620 *ctx)
--
2.15.1
--
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