From: Antonio Borneo antonio.borneo@foss.st.com
[ Upstream commit 9cc4853e4781bf0dd0f35355dc92d97c9da02f5d ]
Commit 680532c50bca ("drm: adv7511: Add support for i2c_new_secondary_device") allows a device tree node to override the default addresses of the secondary i2c devices. This is useful for solving address conflicts on the i2c bus.
In adv7511_init_cec_regmap() the new i2c address of cec device is read from device tree and immediately accessed, well before it is written in the proper register to override the default address. This can cause an i2c error during probe and a consequent probe failure.
Once the new i2c address is read from the device tree, override the default address before any attempt to access the cec.
Tested with adv7533 and stm32mp157f.
Signed-off-by: Antonio Borneo antonio.borneo@foss.st.com Fixes: 680532c50bca ("drm: adv7511: Add support for i2c_new_secondary_device") Reviewed-by: Kieran Bingham kieran.bingham+renesas@ideasonboard.com Signed-off-by: Robert Foss robert.foss@linaro.org Link: https://patchwork.freedesktop.org/patch/msgid/20220607213144.427177-1-antoni... Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/gpu/drm/bridge/adv7511/adv7511_drv.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/bridge/adv7511/adv7511_drv.c b/drivers/gpu/drm/bridge/adv7511/adv7511_drv.c index 668dcefbae17..fba6ad3bb6ad 100644 --- a/drivers/gpu/drm/bridge/adv7511/adv7511_drv.c +++ b/drivers/gpu/drm/bridge/adv7511/adv7511_drv.c @@ -1060,6 +1060,10 @@ static int adv7511_init_cec_regmap(struct adv7511 *adv) ADV7511_CEC_I2C_ADDR_DEFAULT); if (IS_ERR(adv->i2c_cec)) return PTR_ERR(adv->i2c_cec); + + regmap_write(adv->regmap, ADV7511_REG_CEC_I2C_ADDR, + adv->i2c_cec->addr << 1); + i2c_set_clientdata(adv->i2c_cec, adv);
adv->regmap_cec = devm_regmap_init_i2c(adv->i2c_cec, @@ -1264,9 +1268,6 @@ static int adv7511_probe(struct i2c_client *i2c, const struct i2c_device_id *id) if (ret) goto err_i2c_unregister_packet;
- regmap_write(adv7511->regmap, ADV7511_REG_CEC_I2C_ADDR, - adv7511->i2c_cec->addr << 1); - INIT_WORK(&adv7511->hpd_work, adv7511_hpd_work);
if (i2c->irq) {