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[v3,00/11] drm/msm/dsi_phy: Replace parent names with clk_hw pointers

Message ID 20220629225331.357308-1-marijn.suijten@somainline.org (mailing list archive)
Headers show
Series drm/msm/dsi_phy: Replace parent names with clk_hw pointers | expand

Message

Marijn Suijten June 29, 2022, 10:53 p.m. UTC
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.

Changes since v2:
- in fixed-factor:
  - Reorder if - else if change to consume less diff;
  - Go over 80-char column lint when adding new arguments to function
    calls, instead of reflowing all arguments to adhere to this limit;
    also consuming less diff.

v2: https://lore.kernel.org/linux-arm-msm/20220601220747.1145095-1-marijn.suijten@somainline.org/

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/20220523213837.1016542-1-marijn.suijten@somainline.org/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                |  45 ++++-
 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, 351 insertions(+), 311 deletions(-)

Comments

Dmitry Baryshkov July 14, 2022, 10:19 a.m. UTC | #1
On 30/06/2022 01:53, Marijn Suijten wrote:
> 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.
> 
> Changes since v2:
> - in fixed-factor:
>    - Reorder if - else if change to consume less diff;
>    - Go over 80-char column lint when adding new arguments to function
>      calls, instead of reflowing all arguments to adhere to this limit;
>      also consuming less diff.
> 
> v2: https://lore.kernel.org/linux-arm-msm/20220601220747.1145095-1-marijn.suijten@somainline.org/
> 
> 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/20220523213837.1016542-1-marijn.suijten@somainline.org/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()

Stephen, do we stand a chance of landing patches 1-3 into 5.20? We would 
like to merge the series into 5.21 through the msm-next. Landing clk 
patches in 5.20 would save us from using immutable branches, etc.

>    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                |  45 ++++-
>   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, 351 insertions(+), 311 deletions(-)
>
Stephen Boyd July 29, 2022, 11:41 p.m. UTC | #2
Quoting Dmitry Baryshkov (2022-07-14 03:19:12)
> On 30/06/2022 01:53, Marijn Suijten wrote:
> > 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()
> 
> Stephen, do we stand a chance of landing patches 1-3 into 5.20? We would 
> like to merge the series into 5.21 through the msm-next. Landing clk 
> patches in 5.20 would save us from using immutable branches, etc.
> 

Sure I can land the first three patches now for 5.20