linux-kernel - Re: [PATCH v6 06/17] drm/msm/dsi/phy: Toggle back buffer resync after preparing PLL

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Message-ID: <c0864d4f-fede-4d2e-8f93-c52d870adb5d@linaro.org>
Date: Wed, 13 Aug 2025 20:25:59 +0200
From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To: Abhinav Kumar <quic_abhinavk@...cinc.com>, Sean Paul <sean@...rly.run>,
 Marijn Suijten <marijn.suijten@...ainline.org>,
 David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
 Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>,
 Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
 Conor Dooley <conor+dt@...nel.org>,
 Krishna Manikandan <quic_mkrishn@...cinc.com>,
 Jonathan Marek <jonathan@...ek.ca>, Kuogee Hsieh <quic_khsieh@...cinc.com>,
 Neil Armstrong <neil.armstrong@...aro.org>,
 Dmitry Baryshkov <lumag@...nel.org>, Bjorn Andersson <andersson@...nel.org>,
 Michael Turquette <mturquette@...libre.com>, Stephen Boyd
 <sboyd@...nel.org>, Rob Clark <robin.clark@....qualcomm.com>
Cc: linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org,
 freedreno@...ts.freedesktop.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-clk@...r.kernel.org,
 Abel Vesa <abel.vesa@...aro.org>, Srinivas Kandagatla <srini@...nel.org>,
 Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
Subject: Re: [PATCH v6 06/17] drm/msm/dsi/phy: Toggle back buffer resync after
 preparing PLL

On 10/06/2025 16:05, Krzysztof Kozlowski wrote:
> According to Hardware Programming Guide for DSI PHY, the retime buffer
> resync should be done after PLL clock users (byte_clk and intf_byte_clk)
> are enabled.  Downstream also does it as part of configuring the PLL.
> 
> Driver was only turning off the resync FIFO buffer, but never bringing it
> on again.
> 
> Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
> ---


BTW, this and two other fixes from this thread were for some reason not
picked up.

One fix got comments, but it does not stop rest of the fixes,
considering they were reviewed.

Best regards,
Krzysztof