From: Johan Hovold <johan@kernel.org>
To: Sasha Levin <sashal@kernel.org>
Cc: linux-kernel@vger.kernel.org, stable@vger.kernel.org,
Bjorn Andersson <quic_bjorande@quicinc.com>,
Kuogee Hsieh <quic_khsieh@quicinc.com>,
Dmitry Baryshkov <dmitry.baryshkov@linaro.org>,
robdclark@gmail.com, quic_abhinavk@quicinc.com,
airlied@gmail.com, daniel@ffwll.ch, swboyd@chromium.org,
johan+linaro@kernel.org, quic_sbillaka@quicinc.com,
linux-arm-msm@vger.kernel.org, dri-devel@lists.freedesktop.org,
freedreno@lists.freedesktop.org
Subject: Re: [PATCH AUTOSEL 6.1 18/58] drm/msm/dp: Remove INIT_SETUP delay
Date: Mon, 27 Feb 2023 10:12:42 +0100 [thread overview]
Message-ID: <Y/x0CpMmNV6pJlZB@hovoldconsulting.com> (raw)
In-Reply-To: <20230227020457.1048737-18-sashal@kernel.org>
On Sun, Feb 26, 2023 at 09:04:16PM -0500, Sasha Levin wrote:
> From: Bjorn Andersson <quic_bjorande@quicinc.com>
>
> [ Upstream commit e17af1c9d861dc177e5b56009bd4f71ace688d97 ]
>
> During initalization of the DisplayPort controller an EV_HPD_INIT_SETUP
> event is generated, but with a delay of 100 units. This delay existed to
> circumvent bug in the QMP combo PHY driver, where if the DP part was
> powered up before USB, the common properties would not be properly
> initialized - and USB wouldn't work.
>
> This issue was resolved in the recent refactoring of the QMP driver,
> so it's now possible to remove this delay.
>
> While there is still a timing dependency in the current implementation,
> test indicates that it's now possible to boot with an external display
> on USB Type-C and have the display power up, without disconnecting and
> reconnecting the cable.
>
> Signed-off-by: Bjorn Andersson <quic_bjorande@quicinc.com>
> Reviewed-by: Kuogee Hsieh <quic_khsieh@quicinc.com>
> Patchwork: https://patchwork.freedesktop.org/patch/518729/
> Link: https://lore.kernel.org/r/20230117172951.2748456-1-quic_bjorande@quicinc.com
> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
> Signed-off-by: Sasha Levin <sashal@kernel.org>
This is not a bug fix and should not be backported.
Johan
next prev parent reply other threads:[~2023-02-27 9:17 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20230227020457.1048737-1-sashal@kernel.org>
2023-02-27 2:04 ` [PATCH AUTOSEL 6.1 18/58] drm/msm/dp: Remove INIT_SETUP delay Sasha Levin
2023-02-27 9:12 ` Johan Hovold [this message]
2023-02-27 2:04 ` [PATCH AUTOSEL 6.1 24/58] drm/msm/dsi: Add missing check for alloc_ordered_workqueue Sasha Levin
2023-02-27 2:04 ` [PATCH AUTOSEL 6.1 32/58] drm/msm/dpu: Add DSC hardware blocks to register snapshot Sasha Levin
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