[v2,00/11] drm/msm/dsi_phy: Replace parent names with clk_hw pointers

Message

Marijn Suijten June 1, 2022, 10:07 p.m. UTC

As stated in [1] I promised to tackle and send this series.

parent_hw pointers are easier to manage and cheaper to use than
repeatedly formatting the parent name and subsequently leaving the clk
framework to perform lookups based on that name.

This series starts out by adding extra constructors for divider, mux and
fixed-factor clocks that have parent_hw(s) pointer argument(s) instead
of some DT index or name.  Followed by individual patches performing the
conversion, one DSI PHY at a time.

dsi_phy_28nm_8960 includes an extra fixup to replace "eternal"
devm_kzalloc allocations (for the lifetime of the device) with
stack-local char arrays, like all the other DSI PHY drivers.

(Questions from v1 cover letter regarding the future of these drivers
 is omitted for brevity.)

And with enough future improvements out of the way, let's round out this
patch-series by stating that it has been successfully tested on:

- Sony Nile Discovery (Xperia XA2 Ultra): 14nm;
- Sony Seine PDX201 (Xperia 10II): 14nm;
- Sony Loire Suzu (Xperia X): 28nm.

And no diff is observed in debugfs's clk_summary.

Unfortunately all other devices in my collection with a 7/10nm DSI PHY
have a DSC panel which we have yet to get working.

[1]: https://lore.kernel.org/linux-arm-msm/[e-mail]/

Changes since v1:

- Moved indentation changes to separate patch (Dmitry);
- dsi_phy_28nm_8960: move clock name allocation removal prior to
  parent_hw refactor;
- Remove vco_name stack-local char array in favour of reusing clk_name
  (Dmitry);
- Inserted additional patch to replace hardcoded char-array length
  constant 32 with sizeof(clk_name).

v1: https://lore.kernel.org/linux-arm-msm/[e-mail]/T/#u

Marijn Suijten (11):
  clk: divider: Introduce devm_clk_hw_register_divider_parent_hw()
  clk: mux: Introduce devm_clk_hw_register_mux_parent_hws()
  clk: fixed-factor: Introduce *clk_hw_register_fixed_factor_parent_hw()
  drm/msm/dsi/phy: Reindent and reflow multiline function calls
  drm/msm/dsi_phy_28nm_8960: Use stack memory for temporary clock names
  drm/msm/dsi/phy: Replace hardcoded char-array length with sizeof()
  drm/msm/dsi_phy_28nm_8960: Replace parent names with clk_hw pointers
  drm/msm/dsi_phy_28nm: Replace parent names with clk_hw pointers
  drm/msm/dsi_phy_14nm: Replace parent names with clk_hw pointers
  drm/msm/dsi_phy_10nm: Replace parent names with clk_hw pointers
  drm/msm/dsi_phy_7nm: Replace parent names with clk_hw pointers

 drivers/clk/clk-fixed-factor.c                |  57 ++++--
 drivers/gpu/drm/msm/dsi/phy/dsi_phy_10nm.c    | 165 +++++++++---------
 drivers/gpu/drm/msm/dsi/phy/dsi_phy_14nm.c    |  55 +++---
 drivers/gpu/drm/msm/dsi/phy/dsi_phy_28nm.c    | 117 ++++++-------
 .../gpu/drm/msm/dsi/phy/dsi_phy_28nm_8960.c   |  90 +++++-----
 drivers/gpu/drm/msm/dsi/phy/dsi_phy_7nm.c     | 156 ++++++++---------
 include/linux/clk-provider.h                  |  34 ++++
 7 files changed, 358 insertions(+), 316 deletions(-)