linux-kernel - Re: [Patch 05/35] media: ti-vpe: Use line average de-interlacing for first 2 frames

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Date:   Thu, 3 Nov 2016 15:27:23 +0100
From:   Hans Verkuil <hverkuil@...all.nl>
To:     Benoit Parrot <bparrot@...com>
Cc:     linux-media@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [Patch 05/35] media: ti-vpe: Use line average de-interlacing for
 first 2 frames

On 24/10/16 18:56, Benoit Parrot wrote:
> Hans Verkuil <hverkuil@...all.nl> wrote on Mon [2016-Oct-17 16:14:35 +0200]:
>> On 09/28/2016 11:20 PM, Benoit Parrot wrote:
>>> From: Archit Taneja <archit@...com>
>>>
>>> For n input fields, the VPE de-interlacer creates n - 2 progressive frames.
>>
>> That's confusing. I think you mean '(n / 2) - 1'? Two fields make one frame, right?
>
> No it is (N - 2), the motion detection block requires 3 fields to create the motion
> vector data. So without doing anything special the first progressive frame would be
> generated after the 3 field is consumed and then a progressive frame is generated
> every field after that always keeping the last 2 fields in reserve.
>
> This patch adds a special modes so that line averaging mode is use for the
> first two fields so that in the end we get N progressive frames generated
> from N fields.

OK, so the commit log needs a bit more work :-)

If I'm confused, then others will be as well is my guess...

Regards,

	Hans

>
> Benoit
>
>>
>> Regards,
>>
>> 	Hans
>>
>>>
>>> To support this, we use line average mode of de-interlacer for the first 2
>>> input fields to generate 2 progressive frames. We then revert back to the
>>> preferred EDI method, and create n - 2 frames, creating a sum of n frames.
>>>
>>> Signed-off-by: Archit Taneja <archit@...com>
>>> Signed-off-by: Nikhil Devshatwar <nikhil.nd@...com>
>>> Signed-off-by: Benoit Parrot <bparrot@...com>
>>> ---
>>>  drivers/media/platform/ti-vpe/vpe.c | 33 +++++++++++++++++++++++++++++++--
>>>  1 file changed, 31 insertions(+), 2 deletions(-)
>>>
>>> diff --git a/drivers/media/platform/ti-vpe/vpe.c b/drivers/media/platform/ti-vpe/vpe.c
>>> index 3921fd8cdf1d..a0b29685fb69 100644
>>> --- a/drivers/media/platform/ti-vpe/vpe.c
>>> +++ b/drivers/media/platform/ti-vpe/vpe.c
>>> @@ -141,7 +141,7 @@ struct vpe_dei_regs {
>>>   */
>>>  static const struct vpe_dei_regs dei_regs = {
>>>  	.mdt_spacial_freq_thr_reg = 0x020C0804u,
>>> -	.edi_config_reg = 0x0118100Fu,
>>> +	.edi_config_reg = 0x0118100Cu,
>>>  	.edi_lut_reg0 = 0x08040200u,
>>>  	.edi_lut_reg1 = 0x1010100Cu,
>>>  	.edi_lut_reg2 = 0x10101010u,
>>> @@ -798,6 +798,23 @@ static void set_dei_shadow_registers(struct vpe_ctx *ctx)
>>>  	ctx->load_mmrs = true;
>>>  }
>>>
>>> +static void config_edi_input_mode(struct vpe_ctx *ctx, int mode)
>>> +{
>>> +	struct vpe_mmr_adb *mmr_adb = ctx->mmr_adb.addr;
>>> +	u32 *edi_config_reg = &mmr_adb->dei_regs[3];
>>> +
>>> +	if (mode & 0x2)
>>> +		write_field(edi_config_reg, 1, 1, 2);	/* EDI_ENABLE_3D */
>>> +
>>> +	if (mode & 0x3)
>>> +		write_field(edi_config_reg, 1, 1, 3);	/* EDI_CHROMA_3D  */
>>> +
>>> +	write_field(edi_config_reg, mode, VPE_EDI_INP_MODE_MASK,
>>> +		VPE_EDI_INP_MODE_SHIFT);
>>> +
>>> +	ctx->load_mmrs = true;
>>> +}
>>> +
>>>  /*
>>>   * Set the shadow registers whose values are modified when either the
>>>   * source or destination format is changed.
>>> @@ -1111,6 +1128,15 @@ static void device_run(void *priv)
>>>  	ctx->dst_vb = v4l2_m2m_dst_buf_remove(ctx->fh.m2m_ctx);
>>>  	WARN_ON(ctx->dst_vb == NULL);
>>>
>>> +	if (ctx->deinterlacing) {
>>> +		/*
>>> +		 * we have output the first 2 frames through line average, we
>>> +		 * now switch to EDI de-interlacer
>>> +		 */
>>> +		if (ctx->sequence == 2)
>>> +			config_edi_input_mode(ctx, 0x3); /* EDI (Y + UV) */
>>> +	}
>>> +
>>>  	/* config descriptors */
>>>  	if (ctx->dev->loaded_mmrs != ctx->mmr_adb.dma_addr || ctx->load_mmrs) {
>>>  		vpdma_map_desc_buf(ctx->dev->vpdma, &ctx->mmr_adb);
>>> @@ -1865,7 +1891,10 @@ static void vpe_buf_queue(struct vb2_buffer *vb)
>>>
>>>  static int vpe_start_streaming(struct vb2_queue *q, unsigned int count)
>>>  {
>>> -	/* currently we do nothing here */
>>> +	struct vpe_ctx *ctx = vb2_get_drv_priv(q);
>>> +
>>> +	if (ctx->deinterlacing)
>>> +		config_edi_input_mode(ctx, 0x0);
>>>
>>>  	return 0;
>>>  }
>>>
> --
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