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Subject: Re: [PATCH 3/3] drm/exynos/gsc: Add rotation hardware limits of
 gscaler
To: Hoegeun Kwon <hoegeun.kwon@samsung.com>,
        Krzysztof Kozlowski <krzk@kernel.org>, Inki Dae <inki.dae@samsung.com>,
        sw0312.kim@samsung.com, airlied@linux.ie, kgene@kernel.org,
        robh+dt@kernel.org, mark.rutland@arm.com, catalin.marinas@arm.com,
        will.deacon@arm.com
Cc: dri-devel@lists.freedesktop.org, linux-arm-kernel@lists.infradead.org,
        linux-samsung-soc@vger.kernel.org, linux-kernel@vger.kernel.org,
        devicetree@vger.kernel.org
From: Marek Szyprowski <m.szyprowski@samsung.com>
Message-id: <024ea0a3-abe7-4a87-7723-2e7341237df2@samsung.com>
Date: Thu, 07 Sep 2017 13:25:22 +0200
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Hi Hoegeun,

On 2017-09-07 07:16, Hoegeun Kwon wrote:
> On 09/04/2017 03:19 PM, Hoegeun Kwon wrote:
>> On 09/01/2017 04:31 PM, Marek Szyprowski wrote:
>>> Hi Hoegeun,
>>>
>>> On 2017-09-01 03:47, Hoegeun Kwon wrote:
>>>> The gscaler has hardware rotation limits that need to be imported from
>>>> dts. Parse them and add them to the property list.
>>>>
>>>> The rotation hardware limits are related to the cropped source size.
>>>> When swap occurs, use rot_max size instead of crop_max size.
>>>>
>>>> Also the scaling limits are related to post size, use pos size to
>>>> check the limits.
>>>>
>>>> Signed-off-by: Hoegeun Kwon <hoegeun.kwon@samsung.com>
>>>> ---
>>>>   drivers/gpu/drm/exynos/exynos_drm_gsc.c | 63 
>>>> +++++++++++++++++++++------------
>>>>   include/uapi/drm/exynos_drm.h           |  2 ++
>>>>   2 files changed, 42 insertions(+), 23 deletions(-)
>>>>
>>>> diff --git a/drivers/gpu/drm/exynos/exynos_drm_gsc.c 
>>>> b/drivers/gpu/drm/exynos/exynos_drm_gsc.c
>>>> index 0506b2b..dd9b057 100644
>>>> --- a/drivers/gpu/drm/exynos/exynos_drm_gsc.c
>>>> +++ b/drivers/gpu/drm/exynos/exynos_drm_gsc.c
>>>> @@ -1401,6 +1401,23 @@ static int gsc_ippdrv_check_property(struct 
>>>> device *dev,
>>>>       bool swap;
>>>>       int i;
>>>>   +    config = &property->config[EXYNOS_DRM_OPS_DST];
>>>> +
>>>> +    /* check for degree */
>>>> +    switch (config->degree) {
>>>> +    case EXYNOS_DRM_DEGREE_90:
>>>> +    case EXYNOS_DRM_DEGREE_270:
>>>> +        swap = true;
>>>> +        break;
>>>> +    case EXYNOS_DRM_DEGREE_0:
>>>> +    case EXYNOS_DRM_DEGREE_180:
>>>> +        swap = false;
>>>> +        break;
>>>> +    default:
>>>> +        DRM_ERROR("invalid degree.\n");
>>>> +        goto err_property;
>>>> +    }
>>>> +
>>>>       for_each_ipp_ops(i) {
>>>>           if ((i == EXYNOS_DRM_OPS_SRC) &&
>>>>               (property->cmd == IPP_CMD_WB))
>>>> @@ -1416,21 +1433,6 @@ static int gsc_ippdrv_check_property(struct 
>>>> device *dev,
>>>>               goto err_property;
>>>>           }
>>>>   -        /* check for degree */
>>>> -        switch (config->degree) {
>>>> -        case EXYNOS_DRM_DEGREE_90:
>>>> -        case EXYNOS_DRM_DEGREE_270:
>>>> -            swap = true;
>>>> -            break;
>>>> -        case EXYNOS_DRM_DEGREE_0:
>>>> -        case EXYNOS_DRM_DEGREE_180:
>>>> -            swap = false;
>>>> -            break;
>>>> -        default:
>>>> -            DRM_ERROR("invalid degree.\n");
>>>> -            goto err_property;
>>>> -        }
>>>> -
>>>>           /* check for buffer bound */
>>>>           if ((pos->x + pos->w > sz->hsize) ||
>>>>               (pos->y + pos->h > sz->vsize)) {
>>>> @@ -1438,21 +1440,27 @@ static int gsc_ippdrv_check_property(struct 
>>>> device *dev,
>>>>               goto err_property;
>>>>           }
>>>>   +        /*
>>>> +         * The rotation hardware limits are related to the cropped
>>>> +         * source size. So use rot_max size to check the limits when
>>>> +         * swap happens. And also the scaling limits are related 
>>>> to pos
>>>> +         * size, use pos size to check the limits.
>>>> +         */
>>>>           /* check for crop */
>>>>           if ((i == EXYNOS_DRM_OPS_SRC) && (pp->crop)) {
>>>>               if (swap) {
>>>>                   if ((pos->h < pp->crop_min.hsize) ||
>>>> -                    (sz->vsize > pp->crop_max.hsize) ||
>>>> +                    (pos->h > pp->rot_max.hsize) ||
>>>>                       (pos->w < pp->crop_min.vsize) ||
>>>> -                    (sz->hsize > pp->crop_max.vsize)) {
>>>> +                    (pos->w > pp->rot_max.vsize)) {
>>>>                       DRM_ERROR("out of crop size.\n");
>>>>                       goto err_property;
>>>>                   }
>>>>               } else {
>>>>                   if ((pos->w < pp->crop_min.hsize) ||
>>>> -                    (sz->hsize > pp->crop_max.hsize) ||
>>>> +                    (pos->w > pp->crop_max.hsize) ||
>>>>                       (pos->h < pp->crop_min.vsize) ||
>>>> -                    (sz->vsize > pp->crop_max.vsize)) {
>>>> +                    (pos->h > pp->crop_max.vsize)) {
>>>>                       DRM_ERROR("out of crop size.\n");
>>>>                       goto err_property;
>>>>                   }
>>>> @@ -1463,17 +1471,17 @@ static int gsc_ippdrv_check_property(struct 
>>>> device *dev,
>>>>           if ((i == EXYNOS_DRM_OPS_DST) && (pp->scale)) {
>>>>               if (swap) {
>>>>                   if ((pos->h < pp->scale_min.hsize) ||
>>>> -                    (sz->vsize > pp->scale_max.hsize) ||
>>>> +                    (pos->h > pp->scale_max.hsize) ||
>>>>                       (pos->w < pp->scale_min.vsize) ||
>>>> -                    (sz->hsize > pp->scale_max.vsize)) {
>>>> +                    (pos->w > pp->scale_max.vsize)) {
>>>>                       DRM_ERROR("out of scale size.\n");
>>>>                       goto err_property;
>>>>                   }
>>>>               } else {
>>>>                   if ((pos->w < pp->scale_min.hsize) ||
>>>> -                    (sz->hsize > pp->scale_max.hsize) ||
>>>> +                    (pos->w > pp->scale_max.hsize) ||
>>>>                       (pos->h < pp->scale_min.vsize) ||
>>>> -                    (sz->vsize > pp->scale_max.vsize)) {
>>>> +                    (pos->h > pp->scale_max.vsize)) {
>>>>                       DRM_ERROR("out of scale size.\n");
>>>>                       goto err_property;
>>>>                   }
>>>> @@ -1676,6 +1684,15 @@ static int gsc_probe(struct platform_device 
>>>> *pdev)
>>>>               dev_warn(dev, "failed to get system register.\n");
>>>>               ctx->sysreg = NULL;
>>>>           }
>>>> +
>>>> +        ret = of_property_read_u32(dev->of_node, "rot-max-hsize",
>>>> + &ctx->ippdrv.prop_list.rot_max.hsize);
>>>> +        ret |= of_property_read_u32(dev->of_node, "rot-max-vsize",
>>>> + &ctx->ippdrv.prop_list.rot_max.vsize);
>>>> +        if (ret) {
>>>> +            dev_err(dev, "rot-max property should be provided by 
>>>> device tree.\n");
>>>> +            return -EINVAL;
>>>> +        }
>>>>       }
>>>>         /* clock control */
>>>> diff --git a/include/uapi/drm/exynos_drm.h 
>>>> b/include/uapi/drm/exynos_drm.h
>>>> index cb3e9f9..d5d5518 100644
>>>> --- a/include/uapi/drm/exynos_drm.h
>>>> +++ b/include/uapi/drm/exynos_drm.h
>>>> @@ -192,6 +192,7 @@ enum drm_exynos_planer {
>>>>    * @crop_max: crop max resolution.
>>>>    * @scale_min: scale min resolution.
>>>>    * @scale_max: scale max resolution.
>>>> + * @rot_max: rotation max resolution.
>>>>    */
>>>>   struct drm_exynos_ipp_prop_list {
>>>>       __u32    version;
>>>> @@ -210,6 +211,7 @@ struct drm_exynos_ipp_prop_list {
>>>>       struct drm_exynos_sz    crop_max;
>>>>       struct drm_exynos_sz    scale_min;
>>>>       struct drm_exynos_sz    scale_max;
>>>> +    struct drm_exynos_sz    rot_max;
>>>>   };
>>>>     /**
>>>
>>> IMO maximum supported picture size should be hardcoded into driver, 
>>> there
>>> is no need to add device tree properties for that. Please also check 
>>> v4l2
>>> driver for Exynos GSC.
>>>
>>> Currently it uses only one compatible - "exynos5-gsc", but imho You 
>>> should
>>> simply replace it with "exynos5250-gsc" and "exynos5420-gsc", and 
>>> add those
>>> variants with proper maximum supported size (2047 and 2016 
>>> respectively).
>>>
>>> Best regards
>>
>> Hi Krzysztof and Marek,
>>
>> Thanks Krzysztof and Marek reviews.
>>
>> As Marek says, rot_max size will be hardcoded into driver,
>> then it will not break the ABI. And also,
>> I will check the v4l2 driver for Exynos GSC.
>>
>> Best regards,
>> Hoegeun
>>
>
> Hi Marek,
>
> I have checked v4l2 driver for Exynos GSC. The v4l2 driver supports
> Exynos 5250 and 5433 GSC. Currently, the hardware limits rotation is
> set to 2047 in the v4l2 driver.
>

V4l2 GSC driver also supports Exynos5420/5422 SoCs, see
# git grep "samsung,exynos5-gsc" arch/arm/boot/dts/

> In my opinion don't need to fix it, because the Exynos 5250 has a
> hardware rotation limits of 2048 and the Exynos 5250 has a hardware
> rotation limits of 2047.

Like you pointed earlier, Exynos 5420/5422/5800 supports rotation only
up to 2016x2016, so additional patch for v4l2 is also needed.

>
> Please tell me if you have any other opinion.
>

Best regards
-- 
Marek Szyprowski, PhD
Samsung R&D Institute Poland