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Message-ID: <CAJ+vNU0q4Ab-1sFsyQv3JRMd54ntMU3=Er6yCNiY=tLCN1N5VQ@mail.gmail.com>
Date: Wed, 22 Nov 2017 20:27:12 -0800
From: Tim Harvey <tharvey@...eworks.com>
To: Hans Verkuil <hverkuil@...all.nl>
Cc: linux-media <linux-media@...r.kernel.org>,
alsa-devel@...a-project.org,
"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
Shawn Guo <shawnguo@...nel.org>,
Steve Longerbeam <slongerbeam@...il.com>,
Philipp Zabel <p.zabel@...gutronix.de>,
Hans Verkuil <hansverk@...co.com>,
Mauro Carvalho Chehab <mchehab@...pensource.com>
Subject: Re: [PATCH 3/5] media: i2c: Add TDA1997x HDMI receiver driver
On Mon, Nov 20, 2017 at 7:39 AM, Hans Verkuil <hverkuil@...all.nl> wrote:
> Hi Tim,
>
> Some more review comments:
>
> On 11/09/2017 07:45 PM, Tim Harvey wrote:
>> Add support for the TDA1997x HDMI receivers.
<snip>
>> + */
>> +struct color_matrix_coefs {
>> + const char *name;
>> + /* Input offsets */
>> + s16 offint1;
>> + s16 offint2;
>> + s16 offint3;
>> + /* Coeficients */
>> + s16 p11coef;
>> + s16 p12coef;
>> + s16 p13coef;
>> + s16 p21coef;
>> + s16 p22coef;
>> + s16 p23coef;
>> + s16 p31coef;
>> + s16 p32coef;
>> + s16 p33coef;
>> + /* Output offsets */
>> + s16 offout1;
>> + s16 offout2;
>> + s16 offout3;
>> +};
>> +
>> +enum {
>> + ITU709_RGBLIMITED,
>> + ITU709_RGBFULL,
>> + ITU601_RGBLIMITED,
>> + ITU601_RGBFULL,
>> + RGBLIMITED_RGBFULL,
>> + RGBLIMITED_ITU601,
>> + RGBFULL_ITU601,
>
> This can't be right.
>ITU709_RGBLIMITED
> You have these conversions:
>
> ITU709_RGBFULL
> ITU601_RGBFULL
> RGBLIMITED_RGBFULL
> RGBLIMITED_ITU601
> RGBFULL_ITU601
> RGBLIMITED_ITU709
> RGBFULL_ITU709
>
> I.e. on the HDMI receiver side you can receive RGB full/limited or ITU601/709.
> On the output side you have RGB full or ITU601/709.
>
> So something like ITU709_RGBLIMITED makes no sense.
>
I misunderstood the V4L2_CID_DV_RX_RGB_RANGE thinking that it allowed
you to configure the output range. If output to the SoC is only ever
full quant range for RGB then I can drop the
ITU709_RGBLIMITED/ITU601_RGBLIMITED conversions.
However, If the output is YUV how do I know if I need to convert to
ITU709 or ITU601 and what are my conversion matrices for
RGBLIMITED_ITU709/RGBFULL_ITU709?
Sorry for all the questions, the colorspace/colorimetry options
confuse the heck out of me.
>> +};
>> +
<snip>
>> +
>> +/* parse an infoframe and do some sanity checks on it */
>> +static unsigned int
>> +tda1997x_parse_infoframe(struct tda1997x_state *state, u16 addr)
>> +{
>> + struct v4l2_subdev *sd = &state->sd;
>> + union hdmi_infoframe frame;
>> + u8 buffer[40];
>> + u8 reg;
>> + int len, err;
>> +
>> + /* read data */
>> + len = io_readn(sd, addr, sizeof(buffer), buffer);
>> + err = hdmi_infoframe_unpack(&frame, buffer);
>> + if (err) {
>> + v4l_err(state->client,
>> + "failed parsing %d byte infoframe: 0x%04x/0x%02x\n",
>> + len, addr, buffer[0]);
>> + return err;
>> + }
>> + hdmi_infoframe_log(KERN_INFO, &state->client->dev, &frame);
>> + switch (frame.any.type) {
>> + /* Audio InfoFrame: see HDMI spec 8.2.2 */
>> + case HDMI_INFOFRAME_TYPE_AUDIO:
>> + /* sample rate */
>> + switch (frame.audio.sample_frequency) {
>> + case HDMI_AUDIO_SAMPLE_FREQUENCY_32000:
>> + state->audio_samplerate = 32000;
>> + break;
>> + case HDMI_AUDIO_SAMPLE_FREQUENCY_44100:
>> + state->audio_samplerate = 44100;
>> + break;
>> + case HDMI_AUDIO_SAMPLE_FREQUENCY_48000:
>> + state->audio_samplerate = 48000;
>> + break;
>> + case HDMI_AUDIO_SAMPLE_FREQUENCY_88200:
>> + state->audio_samplerate = 88200;
>> + break;
>> + case HDMI_AUDIO_SAMPLE_FREQUENCY_96000:
>> + state->audio_samplerate = 96000;
>> + break;
>> + case HDMI_AUDIO_SAMPLE_FREQUENCY_176400:
>> + state->audio_samplerate = 176400;
>> + break;
>> + case HDMI_AUDIO_SAMPLE_FREQUENCY_192000:
>> + state->audio_samplerate = 192000;
>> + break;
>> + default:
>> + case HDMI_AUDIO_SAMPLE_FREQUENCY_STREAM:
>> + break;
>> + }
>> +
>> + /* sample size */
>> + switch (frame.audio.sample_size) {
>> + case HDMI_AUDIO_SAMPLE_SIZE_16:
>> + state->audio_samplesize = 16;
>> + break;
>> + case HDMI_AUDIO_SAMPLE_SIZE_20:
>> + state->audio_samplesize = 20;
>> + break;
>> + case HDMI_AUDIO_SAMPLE_SIZE_24:
>> + state->audio_samplesize = 24;
>> + break;
>> + case HDMI_AUDIO_SAMPLE_SIZE_STREAM:
>> + default:
>> + break;
>> + }
>> +
>> + /* Channel Count */
>> + state->audio_channels = frame.audio.channels;
>> + if (frame.audio.channel_allocation &&
>> + frame.audio.channel_allocation != state->audio_ch_alloc) {
>> + /* use the channel assignment from the infoframe */
>> + state->audio_ch_alloc = frame.audio.channel_allocation;
>> + tda1997x_configure_audout(sd, state->audio_ch_alloc);
>> + /* reset the audio FIFO */
>> + tda1997x_hdmi_info_reset(sd, RESET_AUDIO, false);
>> + }
>> + break;
>> +
>> + /* Auxiliary Video information (AVI) InfoFrame: see HDMI spec 8.2.1 */
>> + case HDMI_INFOFRAME_TYPE_AVI:
>> + state->colorspace = frame.avi.colorspace;
>> + state->colorimetry = frame.avi.colorimetry;
>> + state->range = frame.avi.quantization_range;
>
> This should be ignored if it is overridden by the RGB Quantization Range
> control, or am I missing something?
>
Ok. Sounds like I should only use the range from the infoframe if
range == V4L2_DV_RGB_RANGE_AUTO:
/* Quantization Range */
if (state->range == V4L2_DV_RGB_RANGE_AUTO)
state->range = frame.avi.quantization_range;
if (state->range == HDMI_QUANTIZATION_RANGE_DEFAULT) {
if (frame.avi.video_code <= 1)
state->range = HDMI_QUANTIZATION_RANGE_FULL;
else
state->range = HDMI_QUANTIZATION_RANGE_LIMITED;
}
>> + state->content = frame.avi.content_type;
>> + /*
>> + * If colorimetry not specified, conversion depends on res type:
>> + * - SDTV: ITU601 for SD (480/576/240/288 line resolution)
>> + * - HDTV: ITU709 for HD (720/1080 line resolution)
>> + * - PC: sRGB
>> + * see HDMI specification section 6.7
>> + */
>> + if ((state->colorspace == HDMI_COLORSPACE_YUV422 ||
>> + state->colorspace == HDMI_COLORSPACE_YUV444) &&
>> + (state->colorimetry == HDMI_COLORIMETRY_EXTENDED ||
>> + state->colorimetry == HDMI_COLORIMETRY_NONE)) {
>> + switch (state->timings.bt.height) {
>> + case 480:
>> + case 576:
>> + case 240:
>> + case 288:
>> + state->colorimetry = HDMI_COLORIMETRY_ITU_601;
>> + break;
>> + case 720:
>> + case 1080:
>> + state->colorimetry = HDMI_COLORIMETRY_ITU_709;
>> + break;
>> + default:
>> + state->colorimetry = HDMI_COLORIMETRY_NONE;
>> + break;
>> + }
>> + }
>> + /* if range not specified */
>> + if (state->range == HDMI_QUANTIZATION_RANGE_DEFAULT) {
>> + if (frame.avi.video_code == 0)
>
> This should be:
>
> if (frame.avi.video_code <= 1)
>
> VIC code 1 (VGA) is also full range. It's an exception to the rule.
ok
Thanks,
Tim
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