[PATCH] drm/radeon: warn users when hw_i2c is enabled

[Alex Deucher]

On Tue, Jan 7, 2014 at 10:58 AM, Grigori Goronzy <greg at chown.ath.cx> wrote:
> On 07.01.2014 16:14, Alex Deucher wrote:
>>
>> The hw i2c engines are disabled by default as the
>> current implementation is still experimental.  Print
>> a warning when users enable it so that it's obvious
>> when the option is enabled.
>>
>
> Does hardware I2C actually have any advantage in the DDC use case? AFAICT
> it's only transferring small amounts of data and mostly on display connect
> events, so not very often.

It's lower CPU usage compared to bit-banging and can generate
interrupts if you want to do something else while it fetches the EDID.

Alex