linux-kernel - RE: [PATCH v8 3/6] drm/i915/gvt: Frame buffer decoder support for GVT-g

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Message-ID: <DD379D741F77464281CE7ED1CD7C12DE70671B07@SHSMSX101.ccr.corp.intel.com>
Date:   Wed, 14 Jun 2017 09:50:07 +0000
From:   "Chen, Xiaoguang" <xiaoguang.chen@...el.com>
To:     Zhenyu Wang <zhenyuw@...ux.intel.com>
CC:     "alex.williamson@...hat.com" <alex.williamson@...hat.com>,
        "kraxel@...hat.com" <kraxel@...hat.com>,
        "chris@...is-wilson.co.uk" <chris@...is-wilson.co.uk>,
        "intel-gfx@...ts.freedesktop.org" <intel-gfx@...ts.freedesktop.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "Lv, Zhiyuan" <zhiyuan.lv@...el.com>,
        "intel-gvt-dev@...ts.freedesktop.org" 
        <intel-gvt-dev@...ts.freedesktop.org>,
        "Wang, Zhi A" <zhi.a.wang@...el.com>,
        "Tian, Kevin" <kevin.tian@...el.com>
Subject: RE: [PATCH v8 3/6] drm/i915/gvt: Frame buffer decoder support for
 GVT-g



>-----Original Message-----
>From: Zhenyu Wang [mailto:zhenyuw@...ux.intel.com]
>Sent: Wednesday, June 14, 2017 5:39 PM
>To: Chen, Xiaoguang <xiaoguang.chen@...el.com>
>Cc: alex.williamson@...hat.com; kraxel@...hat.com; chris@...is-wilson.co.uk;
>intel-gfx@...ts.freedesktop.org; linux-kernel@...r.kernel.org;
>zhenyuw@...ux.intel.com; Lv, Zhiyuan <zhiyuan.lv@...el.com>; intel-gvt-
>dev@...ts.freedesktop.org; Wang, Zhi A <zhi.a.wang@...el.com>; Tian, Kevin
><kevin.tian@...el.com>
>Subject: Re: [PATCH v8 3/6] drm/i915/gvt: Frame buffer decoder support for GVT-
>g
>
>On 2017.06.09 14:50:39 +0800, Xiaoguang Chen wrote:
>> decode frambuffer attributes of primary, cursor and sprite plane
>>
>> Signed-off-by: Xiaoguang Chen <xiaoguang.chen@...el.com>
>
>...
>
>> +/**
>> + * intel_vgpu_decode_primary_plane - Decode primary plane
>> + * @vgpu: input vgpu
>> + * @plane: primary plane to save decoded info
>> + * This function is called for decoding plane
>> + *
>> + * Returns:
>> + * 0 on success, non-zero if failed.
>> + */
>> +int intel_vgpu_decode_primary_plane(struct intel_vgpu *vgpu,
>> +	struct intel_vgpu_primary_plane_format *plane) {
>> +	u32 val, fmt;
>> +	struct drm_i915_private *dev_priv = vgpu->gvt->dev_priv;
>> +	int pipe;
>> +
>> +	pipe = get_active_pipe(vgpu);
>> +	if (pipe >= I915_MAX_PIPES)
>> +		return -ENODEV;
>> +
>> +	val = vgpu_vreg(vgpu, DSPCNTR(pipe));
>> +	plane->enabled = !!(val & DISPLAY_PLANE_ENABLE);
>> +	if (!plane->enabled)
>> +		return -ENODEV;
>> +
>> +	if (IS_SKYLAKE(dev_priv)) {
>> +		plane->tiled = (val & PLANE_CTL_TILED_MASK) >>
>> +		_PLANE_CTL_TILED_SHIFT;
>> +		fmt = skl_format_to_drm(
>> +			val & PLANE_CTL_FORMAT_MASK,
>> +			val & PLANE_CTL_ORDER_RGBX,
>> +			val & PLANE_CTL_ALPHA_MASK,
>> +			val & PLANE_CTL_YUV422_ORDER_MASK);
>> +		plane->bpp = skl_pixel_formats[fmt].bpp;
>> +		plane->drm_format = skl_pixel_formats[fmt].drm_format;
>> +	} else {
>> +		plane->tiled = !!(val & DISPPLANE_TILED);
>> +		fmt = (val & DISPPLANE_PIXFORMAT_MASK) >>
>_PRI_PLANE_FMT_SHIFT;
>> +		plane->bpp = bdw_pixel_formats[fmt].bpp;
>> +		plane->drm_format = bdw_pixel_formats[fmt].drm_format;
>> +	}
>> +
>> +	if (!skl_pixel_formats[fmt].bpp	&& !bdw_pixel_formats[fmt].bpp) {
>> +		gvt_vgpu_err("Non-supported pixel format (0x%x)\n", fmt);
>> +		return -EINVAL;
>> +	}
>
>Is this correct? shouldn't be plane->bpp as last time comment?
Yes. But use plane->bpp is more concisely. Will change.
  
>
>> diff --git a/include/uapi/drm/drm_fourcc.h
>> b/include/uapi/drm/drm_fourcc.h index 55e3010..400759f 100644
>> --- a/include/uapi/drm/drm_fourcc.h
>> +++ b/include/uapi/drm/drm_fourcc.h
>> @@ -161,6 +161,12 @@ extern "C" {
>>  #define DRM_FORMAT_YUV444	fourcc_code('Y', 'U', '2', '4') /* non-
>subsampled Cb (1) and Cr (2) planes */
>>  #define DRM_FORMAT_YVU444	fourcc_code('Y', 'V', '2', '4') /* non-
>subsampled Cr (1) and Cb (2) planes */
>>
>> +/*
>> + * Intel GVT-g plane format definition  */ #define
>> +DRM_FORMAT_XRGB161616_GVT  fourcc_code('X', 'R', '4', '8') /* [63:0]
>> +x:R:G:B 16:16:16:16 little endian */ #define
>> +DRM_FORMAT_XBGR161616_GVT  fourcc_code('X', 'B', '4', '8') /* [63:0]
>> +x:B:G:R 16:16:16:16 little endian */
>> +
>>
>
>This should be a seperate patch and not need GVT postfix for format definition.
OK.

>
>--
>Open Source Technology Center, Intel ltd.
>
>$gpg --keyserver wwwkeys.pgp.net --recv-keys 4D781827