lcd bringup with spi interface on msm8909/msm8909w

最新推荐文章于 2022-07-27 23:32:13 发布

原创最新推荐文章于 2022-07-27 23:32:13 发布 · 2.5k 阅读

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#spi-lcd #msm8909w #st7789h

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本文介绍了SurfaceFlinger中Framebuffer内存分配的实现细节，并展示了如何通过修改系统属性来禁用硬件Composer，以及调整LCD密度的方法。

We have implemented a mature scheme and soon will come into mass product. If you have any interesting， email me: robinyeung@163.com

And the frame rate is 30.

application resolution set
xxx/common/rootdir/etc/init.qcom.early_boot.sh: set density of lcd
disable HWC
In SurfaceFlinger.cpp

frameworks/native/services/surfaceflinger/SurfaceFlinger.cpp

In system.prop

qcom/msm8953_64/system.prop

persist.hwc.mdpcomp.enable=true
persist.hwc.enable_vds=1

allocate framebuffer

static int mdss_fb_alloc_fbmem(struct msm_fb_data_type *mfd)
{

    if (mfd->mdp.fb_mem_alloc_fnc) {

        return mfd->mdp.fb_mem_alloc_fnc(mfd);
    } else if (mfd->mdp.fb_mem_get_iommu_domain) {
        int dom = mfd->mdp.fb_mem_get_iommu_domain();
        if (dom >= 0)
            return mdss_fb_alloc_fbmem_iommu(mfd, dom);
        else
            return -ENOMEM;
    } else {
        pr_err("no fb memory allocator function defined\n");
        return -ENOMEM;
    }
}