[PATCH] drm/exynos: restore core HDMI settings

[Inki Dae]

On 2014년 05월 13일 13:44, Shirish S wrote:
> Hi,
> 
> On Wed, Feb 19, 2014 at 4:02 PM, Inki Dae <inki.dae at samsung.com> wrote:
>> 2014-02-14 16:34 GMT+09:00 Shirish S <s.shirish at samsung.com>:
>>> In DVI mode the video preamble and Guard band should
>>> be disabled whereas it should be applied in HDMI mode,
>>> the re-applying of preamble and guard band was missing,
>>> which resulted in display failures when switched to HDMI
>>> mode from DVI mode.
>>> This patch ensures the setting is applied in HDMI mode.
>>>
>>> Signed-off-by: Shirish S <s.shirish at samsung.com>
>>> ---
>>>  drivers/gpu/drm/exynos/exynos_hdmi.c |    2 ++
>>>  1 file changed, 2 insertions(+)
>>>
>>> diff --git a/drivers/gpu/drm/exynos/exynos_hdmi.c b/drivers/gpu/drm/exynos/exynos_hdmi.c
>>> index a0e10ae..a102076 100644
>>> --- a/drivers/gpu/drm/exynos/exynos_hdmi.c
>>> +++ b/drivers/gpu/drm/exynos/exynos_hdmi.c
>>> @@ -994,6 +994,8 @@ static void hdmi_conf_init(struct hdmi_context *hdata)
>>>         /* choose HDMI mode */
>>>         hdmi_reg_writemask(hdata, HDMI_MODE_SEL,
>>>                 HDMI_MODE_HDMI_EN, HDMI_MODE_MASK);
>>> +       /* Apply Video preable and Guard band in HDMI mode only */
>>> +       hdmi_reg_writeb(hdata, HDMI_CON_2, 0);
>>
>> Isn't hdmi_conf_init function always called after hdmi core is reset?
>> And HDMI_CON_2 would have 0 as reset value. It seems that your code
>> isn't meaningful.
>>
> Now that rahul's patch of "drm/exynos: replace hdmi reset with hdmi disable"
> which removes hdmi core reset is merged in your tree,
>  my patch is required since if the user
> connects HDMI monitor via DVI connector,
> unplugs and then connects to HDMI TV via HDMI cable, it wont work
> as the settings of DVI are still on and not reset-ted.
> Can you kindly apply this patch?
> 

Thanks for the report. Applied.

Thanks,
Inki Dae


>> If you want to set HDMI_CON_2 to HDMI mode in there then it would
>> better to use meaningful macro, HDMI_VID_PREAMBLE_DIS and
>> HDMI_GUARD_BAND_DIS.
>>
>> Thanks,
>> Inki Dae
>>
>>>         /* disable bluescreen */
>>>         hdmi_reg_writemask(hdata, HDMI_CON_0, 0, HDMI_BLUE_SCR_EN);
>>>
>>> --
>>> 1.7.9.5
>>>
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> 
> Thanks & Regards,
> Shirish S
>