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(-)