Re: [PATCH v7 07/10] drm: bridge: samsung-dsim: Add atomic_get_input_bus_fmts

[Marek Vasut <marex@denx.de>]

On 11/3/22 08:40, Jagan Teki wrote:
> On Mon, Oct 17, 2022 at 12:54 PM Marek Vasut <marex@denx.de> wrote:
>>
>> On 10/17/22 05:58, Jagan Teki wrote:
>>> On Sun, Oct 16, 2022 at 3:31 AM Marek Vasut <marex@denx.de> wrote:
>>>>
>>>> On 10/5/22 17:13, Jagan Teki wrote:
>>>>
>>>> [...]
>>>>
>>>>> @@ -1321,6 +1322,32 @@ static void samsung_dsim_atomic_post_disable(struct drm_bridge *bridge,
>>>>>         pm_runtime_put_sync(dsi->dev);
>>>>>     }
>>>>>
>>>>> +#define MAX_INPUT_SEL_FORMATS        1
>>>>> +
>>>>> +static u32 *
>>>>> +samsung_dsim_atomic_get_input_bus_fmts(struct drm_bridge *bridge,
>>>>> +                                    struct drm_bridge_state *bridge_state,
>>>>> +                                    struct drm_crtc_state *crtc_state,
>>>>> +                                    struct drm_connector_state *conn_state,
>>>>> +                                    u32 output_fmt,
>>>>> +                                    unsigned int *num_input_fmts)
>>>>> +{
>>>>> +     u32 *input_fmts;
>>>>> +
>>>>> +     *num_input_fmts = 0;
>>>>> +
>>>>> +     input_fmts = kcalloc(MAX_INPUT_SEL_FORMATS, sizeof(*input_fmts),
>>>>> +                          GFP_KERNEL);
>>>>> +     if (!input_fmts)
>>>>> +             return NULL;
>>>>> +
>>>>> +     /* This is the DSI-end bus format */
>>>>> +     input_fmts[0] = MEDIA_BUS_FMT_RGB888_1X24;
>>>>> +     *num_input_fmts = 1;
>>>>
>>>> Is this the only supported format ? NXP AN13573 lists the following:
>>>
>>> At least it only formats I have tested on my panel.
>>>
>>>>
>>>> i.MX 8/RT MIPI DSI/CSI-2, Rev. 0, 21 March 2022
>>>> 3.7.4 Pixel formats
>>>> Table 14. DSI pixel packing formats
>>>>
>>>> Loosely Packed Pixel Stream, 20-bit YCbCr, 4:2:2
>>>> Packed Pixel Stream, 24-bit YCbCr, 4:2:2
>>>> Packed Pixel Stream, 16-bit YCbCr, 4:2:2
>>>> Packed Pixel Stream, 30-bit RGB, 10-10-10
>>>> Packed Pixel Stream, 36-bit RGB, 12-12-12
>>>> Packed Pixel Stream, 12-bit YCbCr, 4:2:0
>>>> Packed Pixel Stream, 16-bit RGB, 5-6-5
>>>> Packed Pixel Stream, 18-bit RGB, 6-6-6
>>>> Loosely Packed Pixel Stream, 18-bit RGB, 6-6-6
>>>> Packed Pixel Stream, 24-bit RGB, 8-8-8 Format
>>>>
>>>> The MX8MM/MN LCDIF can generate all of those RGB formats , the MX8MP
>>>> LCDIFv3 can also generate the 16bit YCbCr .
>>>>
>>>> It seems there should be more formats here.
>>>
>>> The idea of this patch is to support the default format first, and can
>>> possibly add future patches with the addition of new formats.
>>
>> Since you already know about the list, please add all the formats, so we
>> won't be adding known broken code first, only to fix it later.
> 
> Okay. I can see the DSI section Mini TRM shown below formats. (13.6.2 Features)
> 
> Supports pixel format: 16bpp, 18bpp packed, 18bpp loosely packed (3 byte
> format), and 24bpp
> 
> I will try to add these 4 formats. let me know.

You should be able to add all but the 'Packed Pixel Stream, 12-bit 
YCbCr, 4:2:0' which would have to be defined (that's a few lines patch?).

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