linux-kernel - [PATCH v3 0/2] Use "ref" clocks from firmware for DSI PLL VCO parent

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Date:   Sat, 11 Sep 2021 15:19:19 +0200
From:   Marijn Suijten <marijn.suijten@...ainline.org>
To:     phone-devel@...r.kernel.org
Cc:     ~postmarketos/upstreaming@...ts.sr.ht,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...ainline.org>,
        Konrad Dybcio <konrad.dybcio@...ainline.org>,
        Martin Botka <martin.botka@...ainline.org>,
        Jami Kettunen <jami.kettunen@...ainline.org>,
        Marijn Suijten <marijn.suijten@...ainline.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Rob Clark <robdclark@...il.com>, Sean Paul <sean@...rly.run>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Abhinav Kumar <abhinavk@...eaurora.org>,
        Jonathan Marek <jonathan@...ek.ca>,
        Matthias Kaehlcke <mka@...omium.org>,
        Douglas Anderson <dianders@...omium.org>,
        linux-arm-msm@...r.kernel.org, linux-clk@...r.kernel.org,
        linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        freedreno@...ts.freedesktop.org
Subject: [PATCH v3 0/2] Use "ref" clocks from firmware for DSI PLL VCO parent

All DSI PHY/PLL drivers were referencing their VCO parent clock by a
global name, most of which don't exist or have been renamed.  These
clock drivers seem to function fine without that except the 14nm driver
for sdm6xx [1].

At the same time all DTs provide a "ref" clock as per the requirements
of dsi-phy-common.yaml, but the clock is never used.  This patchset puts
that clock to use without relying on a global clock name, so that all
dependencies are explicitly defined in DT (the firmware) in the end.

[1]: https://lore.kernel.org/linux-arm-msm/386db1a6-a1cd-3c7d-a88e-dc83f8a1be96@somainline.org/

Changes since v2:
  - Added Stephen's a-b and Angelo's r-bs;
  - Added .name fallback in msm8974's dsi_phy_28nm for a more graceful
    transition period;
  - Documented possible breakage in 1/2 if firmware isn't updated in
    parallel with the kernel.

Changes since v1:
  - Dropped "arm: dts: qcom: apq8064: Use 27MHz PXO clock as DSI PLL
    reference" which has made its way into 5.15-fixes in advance of this
    patchset landing in 5.16;
  - Added Fixes: tags for commits that added missing "ref" clocks to DT
    while this firmware clock was never used (until this patchset);
  - Documented missing/wrong and later-added clocks (by aforementioned
    patches) in patch 1/2 more clearly.

Marijn Suijten (2):
  drm/msm/dsi: Use "ref" fw clock instead of global name for VCO parent
  clk: qcom: gcc-sdm660: Remove transient global "xo" clock

 drivers/clk/qcom/gcc-sdm660.c                   | 14 --------------
 drivers/gpu/drm/msm/dsi/phy/dsi_phy_10nm.c      |  4 +++-
 drivers/gpu/drm/msm/dsi/phy/dsi_phy_14nm.c      |  4 +++-
 drivers/gpu/drm/msm/dsi/phy/dsi_phy_28nm.c      |  4 +++-
 drivers/gpu/drm/msm/dsi/phy/dsi_phy_28nm_8960.c |  4 +++-
 drivers/gpu/drm/msm/dsi/phy/dsi_phy_7nm.c       |  4 +++-
 6 files changed, 15 insertions(+), 19 deletions(-)

--
2.33.0