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[RFC,0/7] soc: renesas: rcar-gen3-sysc: Fix power request conflicts

Message ID 20181205155028.14335-1-geert+renesas@glider.be (mailing list archive)
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Series soc: renesas: rcar-gen3-sysc: Fix power request conflicts | expand

Message

Geert Uytterhoeven Dec. 5, 2018, 3:50 p.m. UTC 
Hi Simon, Magnus,

Recent R-Car Gen3 SoCs added an External Request Mask Register to the
System Controller (SYSC).  This register allows to mask external power
requests for CPU or 3DG domains, to prevent conflicts when Linux changes
the state of a power domain through SYSC, which could lead to system
lock-ups.

This RFC patch series starts making use of this register.  Note that the
register is optional, and that its location and contents are
SoC-specific.

This was inspired by a patch in the BSP by Dien Pham
<dien.pham.ry@renesas.com>.

This has been boot-tested on R-Car H3 ES1.0, H3 ES2.0, M3-W ES1.0, M3-N,
V3M, and E3 (only the last 3 have this register!), and regression-tested
on R-Car Gen2.

This has not been tested on R-Car H3 ES3.0, M3-W ES2.0, and V3H.

Thanks for your comments!

Geert Uytterhoeven (7):
  soc: renesas: rcar-sysc: Prepare for fixing power request conflicts
  soc: renesas: r8a7795-sysc: Fix power request conflicts
  soc: renesas: r8a7796-sysc: Fix power request conflicts
  soc: renesas: r8a77965-sysc: Fix power request conflicts
  soc: renesas: r8a77970-sysc: Fix power request conflicts
  soc: renesas: r8a77980-sysc: Fix power request conflicts
  soc: renesas: r8a77990-sysc: Fix power request conflicts

 drivers/soc/renesas/r8a7795-sysc.c  | 32 ++++++++++++++++++++++++-----
 drivers/soc/renesas/r8a7796-sysc.c  | 22 +++++++++++++++++++-
 drivers/soc/renesas/r8a77965-sysc.c |  3 +++
 drivers/soc/renesas/r8a77970-sysc.c |  3 +++
 drivers/soc/renesas/r8a77980-sysc.c |  3 +++
 drivers/soc/renesas/r8a77990-sysc.c |  3 +++
 drivers/soc/renesas/rcar-sysc.c     | 16 +++++++++++++++
 drivers/soc/renesas/rcar-sysc.h     |  7 +++++--
 8 files changed, 81 insertions(+), 8 deletions(-)