linux-kernel - [v5 0/3] drm/msm/dsi: Add 10nm dsi phy tuning configuration support

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Message-Id: <1643573719-32095-1-git-send-email-quic_rajeevny@quicinc.com>
Date:   Mon, 31 Jan 2022 01:45:16 +0530
From:   Rajeev Nandan <quic_rajeevny@...cinc.com>
To:     dri-devel@...ts.freedesktop.org, linux-arm-msm@...r.kernel.org,
        freedreno@...ts.freedesktop.org, devicetree@...r.kernel.org
Cc:     Rajeev Nandan <quic_rajeevny@...cinc.com>,
        linux-kernel@...r.kernel.org, sean@...rly.run, robdclark@...il.com,
        robh+dt@...nel.org, robh@...nel.org, quic_abhinavk@...cinc.com,
        quic_kalyant@...cinc.com, quic_mkrishn@...cinc.com,
        jonathan@...ek.ca, dmitry.baryshkov@...aro.org, airlied@...ux.ie,
        daniel@...ll.ch, swboyd@...omium.org
Subject: [v5 0/3] drm/msm/dsi: Add 10nm dsi phy tuning configuration support

This series is to add DSI PHY tuning support in Qualcomm Snapdragon
SoCs with 10nm DSI PHY e.g. SC7180

In most cases the default values of DSI PHY tuning registers
should be sufficient as they are fully optimized. However, in
some cases (for example, where extreme board parasitics cause
the eye shape to degrade), the override bits can be used to
improve the signal quality.

Different DSI PHY versions have different configurations to adjust the
drive strength, drive level, de-emphasis, etc. The current series has only
those configuration options supported by 10nm PHY, e.g. drive strength and
drive level. The number of registers to configure the drive strength are
different for 7nm PHY. The design can be extended to other DSI PHY versions
if required, as each PHY version can have its callback to get the input
from DT and prepare register values.

Changes in v2:
 - Addressed dt-bindings comments (Stephen Boyd, Dmitry Baryshkov)
 - Split into generic code and 10nm-specific part (Dmitry Baryshkov)
 - Fix the backward compatibility (Dmitry Baryshkov)

Changes in v3:
 - Addressed dt-bindings comments (Rob Herring, Dmitry Baryshkov)
 - Address comments for phy tuning data structure (Dmitry Baryshkov)
 - s/ops.tuning_cfg_init/ops.parse_dt_properties (Dmitry Baryshkov)

Changes in v4:
 - Fixed dt_binding_check error (Rob Herring's bot)
 - Return error in case of out of range values (Dmitry Baryshkov)
 - Return error if dt property is present but parsing is failing

Changes in v5:
 - Fixed missing printk arg

Rajeev Nandan (3):
  dt-bindings: msm/dsi: Add 10nm dsi phy tuning properties
  drm/msm/dsi: Add dsi phy tuning configuration support
  drm/msm/dsi: Add 10nm dsi phy tuning configuration support

 .../bindings/display/msm/dsi-phy-10nm.yaml         |  36 +++++++
 drivers/gpu/drm/msm/dsi/phy/dsi_phy.c              |   6 ++
 drivers/gpu/drm/msm/dsi/phy/dsi_phy.h              |   4 +
 drivers/gpu/drm/msm/dsi/phy/dsi_phy_10nm.c         | 118 +++++++++++++++++++--
 4 files changed, 158 insertions(+), 6 deletions(-)

-- 
2.7.4