linux-kernel - Re: [PATCH v4] drm/msm/dp: do not initialize phy until plugin interrupt received

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Date:   Fri, 19 Nov 2021 02:20:17 +0100
From:   Stephen Boyd <swboyd@...omium.org>
To:     Kuogee Hsieh <quic_khsieh@...cinc.com>, agross@...nel.org,
        airlied@...ux.ie, bjorn.andersson@...aro.org, daniel@...ll.ch,
        dmitry.baryshkov@...aro.org, robdclark@...il.com, sean@...rly.run,
        vkoul@...nel.org
Cc:     quic_abhinavk@...cinc.com, aravindh@...eaurora.org,
        freedreno@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        Kuogee Hsieh <khsieh@...eaurora.org>
Subject: Re: [PATCH v4] drm/msm/dp: do not initialize phy until plugin
 interrupt received

Quoting Kuogee Hsieh (2021-11-09 13:38:13)
> From: Kuogee Hsieh <khsieh@...eaurora.org>
>
> Current DP drivers have regulators, clocks, irq and phy are grouped
> together within a function and executed not in a symmetric manner.
> This increase difficulty of code maintenance and limited code scalability.
> This patch divided the driver life cycle of operation into four states,
> resume (including booting up), dongle plugin, dongle unplugged and suspend.
> Regulators, core clocks and irq are grouped together and enabled at resume
> (or booting up) so that the DP controller is armed and ready to receive HPD
> plugin interrupts. HPD plugin interrupt is generated when a dongle plugs
> into DUT (device under test). Once HPD plugin interrupt is received, DP
> controller will initialize phy so that dpcd read/write will function and
> following link training can be proceeded successfully. DP phy will be
> disabled after main link is teared down at end of unplugged HPD interrupt
> handle triggered by dongle unplugged out of DUT. Finally regulators, code
> clocks and irq are disabled at corresponding suspension.
>
> Changes in V2:
> -- removed unnecessary dp_ctrl NULL check
> -- removed unnecessary phy init_count and power_count DRM_DEBUG_DP logs
> -- remove flip parameter out of dp_ctrl_irq_enable()
> -- add fixes tag
>
> Changes in V3:
> -- call dp_display_host_phy_init() instead of dp_ctrl_phy_init() at
>         dp_display_host_init() for eDP
>
> Changes in V4:
> -- rewording commit text to match this commit changes
>
> Fixes: e91e3065a806 ("drm/msm/dp: Add DP compliance tests on Snapdragon Chipsets")
>
> Signed-off-by: Kuogee Hsieh <quic_khsieh@...cinc.com>
> ---

What commit is this patch based on?