linux-kernel - Re: [PATCH 7/9] drm/verisilicon: Add drm plane funcs

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Date:   Tue, 11 Jul 2023 09:44:15 +0800
From:   Keith Zhao <keith.zhao@...rfivetech.com>
To:     Shengyu Qu <wiagn233@...look.com>,
        <dri-devel@...ts.freedesktop.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <linux-riscv@...ts.infradead.org>,
        <linux-media@...r.kernel.org>, <linaro-mm-sig@...ts.linaro.org>
CC:     David Airlie <airlied@...il.com>, Daniel Vetter <daniel@...ll.ch>,
        "Rob Herring" <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        "Emil Renner Berthing" <kernel@...il.dk>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Sumit Semwal <sumit.semwal@...aro.org>,
        <christian.koenig@....com>, Bjorn Andersson <andersson@...nel.org>,
        "Heiko Stuebner" <heiko@...ech.de>,
        Shawn Guo <shawnguo@...nel.org>, Jagan Teki <jagan@...eble.ai>,
        Chris Morgan <macromorgan@...mail.com>,
        Jack Zhu <jack.zhu@...rfivetech.com>,
        Shengyang Chen <shengyang.chen@...rfivetech.com>,
        Changhuang Liang <changhuang.liang@...rfivetech.com>
Subject: Re: [PATCH 7/9] drm/verisilicon: Add drm plane funcs



On 2023/7/11 0:46, Shengyu Qu wrote:
> Hello Keith,
>> +
>> +static void vs_plane_atomic_update(struct drm_plane *plane,
>> +                   struct drm_atomic_state *state)
>> +{
>> +    struct drm_plane_state *new_state = drm_atomic_get_new_plane_state(state,
>> +                                       plane);
>> +    unsigned char i, num_planes;
>> +    struct drm_framebuffer *fb;
>> +    struct vs_plane *vs_plane = to_vs_plane(plane);
>> +    //struct drm_plane_state *state = plane->state;
>> +    struct vs_crtc *vs_crtc = to_vs_crtc(new_state->crtc);
>> +    struct vs_plane_state *plane_state = to_vs_plane_state(new_state);
>> +    //struct drm_format_name_buf *name = &plane_state->status.format_name;
>> +
>> +    if (!new_state->fb || !new_state->crtc)
>> +        return;
>> +
>> +    fb = new_state->fb;
>> +
>> +    num_planes = vs_get_plane_number(fb);
>> +
>> +    for (i = 0; i < num_planes; i++) {
>> +        struct vs_gem_object *vs_obj;
>> +
>> +        vs_obj = vs_fb_get_gem_obj(fb, i);
>> +        vs_plane->dma_addr[i] = vs_obj->iova + fb->offsets[i];
> 
> There is a dcache flush operation here in downstream driver. Is that a cache coherence problem?
> 
> Best regards,
> 
> Shengyu
> 
>> +    }
>> +
>> +    plane_state->status.src = drm_plane_state_src(new_state);
>> +    plane_state->status.dest = drm_plane_state_dest(new_state);
>> +
>> +    vs_plane->funcs->update(vs_crtc->dev, vs_plane, plane, state);
>> +}
>>yes , You can find that the current situation is very professional. 
This problem exists at present, but the dma interface is not perfect at now, 
and the dma_sync_single_for_device interface needs to be implemented later. 
I will consider repairing this problem in the form of patch