From mboxrd@z Thu Jan  1 00:00:00 1970
From: Jose.Abreu@synopsys.com (Jose Abreu)
Date: Thu, 9 Mar 2017 14:27:45 +0000
Subject: [PATCH v3 4/6] drm: bridge: dw-hdmi: Switch to V4L bus format and
 encodings
In-Reply-To: <28fe7ecf-cf4a-568a-b853-0506c088884d@baylibre.com>
References: <1488904944-14285-1-git-send-email-narmstrong@baylibre.com>
 <1488904944-14285-5-git-send-email-narmstrong@baylibre.com>
 <977cfb29-af7a-2e28-7a7f-396d9ccf3eb8@synopsys.com>
 <28fe7ecf-cf4a-568a-b853-0506c088884d@baylibre.com>
Message-ID: <f73a3cee-3336-2562-696d-dd4e0e7ac680@synopsys.com>
To: linus-amlogic@lists.infradead.org
List-Id: linus-amlogic.lists.infradead.org

Hi Neil,


On 08-03-2017 12:12, Neil Armstrong wrote:
>
> Hi Jose,
>
> It seems here that we only have the RGB444<->YUV444 8bit tables, from the Amlogic
> source I have the following for 10bit, 12bit and 16bit for itu601 :
>
> static const u16 csc_coeff_rgb_out_eitu601_10b[3][4] = {
> 	{ 0x2000, 0x6926, 0x74fd, 0x043b },
> 	{ 0x2000, 0x2cdd, 0x0000, 0x7a65 },
> 	{ 0x2000, 0x0000, 0x38b4, 0x78ea }
> };
>
> static const u16 csc_coeff_rgb_out_eitu601_12b_16b[3][4] = {
> 	{ 0x2000, 0x6926, 0x74fd, 0x10ee },
> 	{ 0x2000, 0x2cdd, 0x0000, 0x6992 },
> 	{ 0x2000, 0x0000, 0x38b4, 0x63a6 }
> };

These two do not match anything I have here.

>
> static const u16 csc_coeff_rgb_in_eitu601_10b[3][4] = {
> 	{ 0x2591, 0x1322, 0x074b, 0x0000 },
> 	{ 0x6535, 0x2000, 0x7acc, 0x0800 },
> 	{ 0x6acd, 0x7534, 0x2000, 0x0800 }
> };

This is more or less correct, I have small offsets. Note that I
even have offsets with the values that are in dw-hdmi driver,
which can be caused because I'm seeing the latest document that
contain these values. I guess they were updated.

>
> static const u16 csc_coeff_rgb_in_eitu601_12b_16b[3][4] = {
> 	{ 0x2591, 0x1322, 0x074b, 0x0000 },
> 	{ 0x6535, 0x2000, 0x7acc, 0x2000 },
> 	{ 0x6acd, 0x7534, 0x2000, 0x2000 }
> };

The same for this.

>
> But I miss the itu709 values.
>
> Could you confirm these values and maybe provide the itu709 values ?

I will have to check if I can provide you the values. I will get
back to you.

Best regards,
Jose Miguel Abreu

>
> Thanks !
> Neil
>