[PATCH v3 05/14] gpu: ipu-v3: Allow negative offsets for interlaced scanning

[Steve Longerbeam]

Hi Philipp,


On 08/02/2018 02:46 AM, Philipp Zabel wrote:
> On Wed, 2018-08-01 at 12:12 -0700, Steve Longerbeam wrote:
>> From: Philipp Zabel <p.zabel at pengutronix.de>
>>
>> The IPU also supports interlaced buffers that start with the bottom field.
>> To achieve this, the the base address EBA has to be increased by a stride
>> length and the interlace offset ILO has to be set to the negative stride.
>>
>> Signed-off-by: Philipp Zabel <p.zabel at pengutronix.de>
>> Signed-off-by: Steve Longerbeam <steve_longerbeam at mentor.com>
>> ---
>>   drivers/gpu/ipu-v3/ipu-cpmem.c | 15 +++++++++++++--
>>   1 file changed, 13 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/gpu/ipu-v3/ipu-cpmem.c b/drivers/gpu/ipu-v3/ipu-cpmem.c
>> index e68e473..8cd9e37 100644
>> --- a/drivers/gpu/ipu-v3/ipu-cpmem.c
>> +++ b/drivers/gpu/ipu-v3/ipu-cpmem.c
>> @@ -269,9 +269,20 @@ EXPORT_SYMBOL_GPL(ipu_cpmem_set_uv_offset);
>>   
>>   void ipu_cpmem_interlaced_scan(struct ipuv3_channel *ch, int stride)
>>   {
>> +	u32 ilo, sly;
>> +
>> +	if (stride < 0) {
>> +		stride = -stride;
>> +		ilo = 0x100000 - (stride / 8);
>> +	} else {
>> +		ilo = stride / 8;
>> +	}
>> +
>> +	sly = (stride * 2) - 1;
>> +
>>   	ipu_ch_param_write_field(ch, IPU_FIELD_SO, 1);
>> -	ipu_ch_param_write_field(ch, IPU_FIELD_ILO, stride / 8);
>> -	ipu_ch_param_write_field(ch, IPU_FIELD_SLY, (stride * 2) - 1);
>> +	ipu_ch_param_write_field(ch, IPU_FIELD_ILO, ilo);
>> +	ipu_ch_param_write_field(ch, IPU_FIELD_SLY, sly);
>>   };
>>   EXPORT_SYMBOL_GPL(ipu_cpmem_interlaced_scan);
> This patch is merged in drm-next: 4e3c5d7e05be ("gpu: ipu-v3: Allow
> negative offsets for interlaced scanning")

I don't see it in drm-next, but I see it in linux-next/master. Thanks.

Steve