lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  PHC 
Open Source and information security mailing list archives
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [day] [month] [year] [list]
Date:   Mon, 17 Feb 2020 17:10:19 +0800
From:   Bibby Hsieh <>
To:     David Airlie <>,
        Matthias Brugger <>,
        Daniel Vetter <>,
CC:     Philipp Zabel <>,
        YT Shen <>,
        Thierry Reding <>,
        CK Hu <>,
        <>, <>,
        <>, <>,
        Bibby Hsieh <>
Subject: [PATCH v1 2/3] drm/mediatek: make sure previous message done or be aborted before send

Mediatek CMDQ driver removed atomic parameter and implementation
related to atomic. DRM driver need to make sure previous message
done or be aborted before we send next message.

If previous message is still waiting for event, it means the
setting hasn't been updated into display hardware register,
we can abort the message and send next message to update the
newest setting into display hardware.
If previous message already started, we have to wait it until
transmission has been completed.

So we flush mbox client before we send new message to controller

This patch depends on ptach:
[0/3] Remove atomic_exec

Signed-off-by: Bibby Hsieh <>
Reviewed-by: CK Hu <>
 drivers/gpu/drm/mediatek/mtk_drm_crtc.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
index 3c53ea22208c..e35b66c5ba0f 100644
--- a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
+++ b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
@@ -491,6 +491,7 @@ static void mtk_drm_crtc_hw_config(struct mtk_drm_crtc *mtk_crtc)
 	if (mtk_crtc->cmdq_client) {
+		mbox_flush(mtk_crtc->cmdq_client->chan, 2000);
 		cmdq_handle = cmdq_pkt_create(mtk_crtc->cmdq_client, PAGE_SIZE);
 		cmdq_pkt_clear_event(cmdq_handle, mtk_crtc->cmdq_event);
 		cmdq_pkt_wfe(cmdq_handle, mtk_crtc->cmdq_event);

Powered by blists - more mailing lists