On 11/29/2017 03:02 AM, John Stultz wrote:
On Sun, Nov 26, 2017 at 4:56 AM, Archit Taneja <architt@xxxxxxxxxxxxxx> wrote:
On 11/17/2017 04:29 AM, John Stultz wrote:
diff --git a/drivers/gpu/drm/bridge/adv7511/adv7511_drv.c
b/drivers/gpu/drm/bridge/adv7511/adv7511_drv.c
index 0e14f15..939c3b9 100644
--- a/drivers/gpu/drm/bridge/adv7511/adv7511_drv.c
+++ b/drivers/gpu/drm/bridge/adv7511/adv7511_drv.c
@@ -1203,12 +1203,12 @@ static int adv7511_probe(struct i2c_client *i2c,
const struct i2c_device_id *id)
#ifdef CONFIG_DRM_I2C_ADV7511_CEC
ret = adv7511_cec_init(dev, adv7511, offset);
- if (ret)
- goto err_unregister_cec;
#else
- regmap_write(adv7511->regmap, ADV7511_REG_CEC_CTRL + offset,
- ADV7511_CEC_CTRL_POWER_DOWN);
+ ret = 1;
#endif
+ if (ret)
+ regmap_write(adv7511->regmap, ADV7511_REG_CEC_CTRL +
offset,
+ ADV7511_CEC_CTRL_POWER_DOWN);
This would force CEC to be powered off even if adv7511_cec_init() returned
0, right?
I don't think so. The initent was its only powered off if
adv7511_cec_init returns an error or if CONFIG_DRM_I2C_ADV7511_CEC is
not set.
Do we know why the call to adv7511_cec_init() is failing on the Hikey board?
If it's
because there isn't a "cec" clock specified in DT, it's not really a fatal
error, it
just means that the platform hasn't been set up to support CEC. In that
Yea. I believe this is the case w/ HiKey. I don't have deeply
detailed docs on the board so I'm not sure if we will be able to
enable that or not (Xinliang/Guodong: Do you know if its possible?).
In the meantime though, we shouldn't regress.
case, we
should just power down the CEC block. So, if adv7511_cec_init() would return
a
-ENOENT, which we could use as a hint to power down CEC. So, maybe something
like this?:
#ifdef CONFIG_DRM_I2C_ADV7511_CEC
ret = adv7511_cec_init(dev, adv7511, offset);
if (ret && ret != -ENOENT)
goto err_unregister_cec;
#endif
if (ret)
regmap_write(adv7511->regmap, ADV7511_REG_CEC_CTRL + offset,
ADV7511_CEC_CTRL_POWER_DOWN);
Apart from this, we should also move adv7511_cec_init() up in the probe so
that
it's called before the drm_bridge is registered.
Hans has since reworked the patch w/ a new version. You might want to
check his patches and see if they fit what your imagining.
Yes, I saw Hans's patch after I wrote to you. That patch looks perfect. I'll
queue that to the drm-misc repo once it's rebased on 4.15-rc1.
Thanks,
Archit
thanks
-john
--
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
a Linux Foundation Collaborative Project
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