linux-kernel - Re: [PATCH 00/49] DRM driver for Hikey 970

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Date:   Mon, 24 Aug 2020 08:49:30 +0200
From:   Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
To:     John Stultz <john.stultz@...aro.org>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linuxarm@...wei.com, mauro.chehab@...wei.com,
        Manivannan Sadhasivam <mani@...nel.org>,
        Daniel Vetter <daniel@...ll.ch>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        Bogdan Togorean <bogdan.togorean@...log.com>,
        Liwei Cai <cailiwei@...ilicon.com>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Rob Herring <robh+dt@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Xinliang Liu <xinliang.liu@...aro.org>,
        Neil Armstrong <narmstrong@...libre.com>,
        Wanchun Zheng <zhengwanchun@...ilicon.com>,
        driverdevel <devel@...verdev.osuosl.org>,
        BPF Mailing List <bpf@...r.kernel.org>,
        linux-media <linux-media@...r.kernel.org>,
        Tomi Valkeinen <tomi.valkeinen@...com>,
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        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
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        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>, Rob Clark <robdclark@...omium.org>,
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        "moderated list:DMA BUFFER SHARING FRAMEWORK" 
        <linaro-mm-sig@...ts.linaro.org>, Wei Xu <xuwei5@...ilicon.com>,
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        Sam Ravnborg <sam@...nborg.org>,
        Network Development <netdev@...r.kernel.org>,
        Sumit Semwal <sumit.semwal@...aro.org>,
        lkml <linux-kernel@...r.kernel.org>,
        Jakub Kicinski <kuba@...nel.org>,
        David Airlie <airlied@...ux.ie>,
        Chen Feng <puck.chen@...ilicon.com>
Subject: Re: [PATCH 00/49] DRM driver for Hikey 970

Hi John,

Em Wed, 19 Aug 2020 20:28:44 -0700
John Stultz <john.stultz@...aro.org> escreveu:


> That said even with the patches I've got on top of your series, I
> still see a few issues:
> 1) I'm seeing red-blue swap with your driver.  I need to dig a bit to
> see what the difference is, I know gralloc has a config option for
> this, and maybe the version of the driver I'm carrying has it wrong?

Maybe it is due to this:

	drivers/staging/hikey9xx/gpu/kirin9xx_drm_overlay_utils.c:      hal_fmt = HISI_FB_PIXEL_FORMAT_BGRA_8888;/* dss_get_format(fb->pixel_format); */

It sounds to me that someone added a hack hardcoding BGRA_8888 over
there.

Btw, I removed the hack, with:


diff --git a/drivers/staging/hikey9xx/gpu/kirin9xx_drm_overlay_utils.c b/drivers/staging/hikey9xx/gpu/kirin9xx_drm_overlay_utils.c
index a68db1a27bbf..ba64aae371e4 100644
--- a/drivers/staging/hikey9xx/gpu/kirin9xx_drm_overlay_utils.c
+++ b/drivers/staging/hikey9xx/gpu/kirin9xx_drm_overlay_utils.c
@@ -857,7 +857,7 @@ void hisi_fb_pan_display(struct drm_plane *plane)
        rect.right = src_w - 1;
        rect.top = 0;
        rect.bottom = src_h - 1;
-       hal_fmt = HISI_FB_PIXEL_FORMAT_BGRA_8888;/* dss_get_format(fb->pixel_format); */
+       hal_fmt = dss_get_format(fb->format->format);
 
        DRM_DEBUG_DRIVER("channel%d: src:(%d,%d, %dx%d) crtc:(%d,%d, %dx%d), rect(%d,%d,%d,%d),fb:%dx%d, pixel_format=%d, stride=%d, paddr=0x%x, bpp=%d.\n",
                         chn_idx, src_x, src_y, src_w, src_h,


And now red and blue are swapped on my HDMI screen too.

I'll compare this part with your version, but I guess the bug is
on this logic.


Thanks,
Mauro