linux-kernel - [PATCH v4 0/4] Simplify PCIe hotplug indicator control

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Message-Id: <20190903111021.1559-1-efremov@linux.com>
Date:   Tue,  3 Sep 2019 14:10:17 +0300
From:   Denis Efremov <efremov@...ux.com>
To:     Bjorn Helgaas <bhelgaas@...gle.com>
Cc:     Denis Efremov <efremov@...ux.com>, Lukas Wunner <lukas@...ner.de>,
        linux-pci@...r.kernel.org,
        Kuppuswamy Sathyanarayanan 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>,
        Oliver O'Halloran <oohall@...il.com>,
        linux-kernel@...r.kernel.org
Subject: [PATCH v4 0/4] Simplify PCIe hotplug indicator control

PCIe defines two optional hotplug indicators: a Power indicator and an
Attention indicator. Both are controlled by the same register, and each
can be on, off or blinking. The current interfaces
(pciehp_green_led_{on,off,blink}() and pciehp_set_attention_status()) are
non-uniform and require two register writes in many cases where we could
do one.

This patchset introduces the new function pciehp_set_indicators(). It
allows one to set two indicators with a single register write. All
calls to previous interfaces (pciehp_green_led_* and
pciehp_set_attention_status()) are replaced with a new one. Thus,
the amount of duplicated code for setting indicators is reduced.

Changes in v4:
  - Changed the inputs validation in pciehp_set_indicators()
  - Moved PCI_EXP_SLTCTL_ATTN_IND_NONE, PCI_EXP_SLTCTL_PWR_IND_NONE
    to drivers/pci/hotplug/pciehp.h and set to -1 for not interfering
    with reserved values in the PCIe Base spec
  - Added set_power_indicator define

Changes in v3:
  - Changed pciehp_set_indicators() to work with existing
    PCI_EXP_SLTCTL_* macros
  - Reworked the inputs validation in pciehp_set_indicators()
  - Removed pciehp_set_attention_status() and pciehp_green_led_*()
    completely

Denis Efremov (4):
  PCI: pciehp: Add pciehp_set_indicators() to jointly set LED indicators
  PCI: pciehp: Switch LED indicators with a single write
  PCI: pciehp: Remove pciehp_set_attention_status()
  PCI: pciehp: Remove pciehp_green_led_{on,off,blink}()

 drivers/pci/hotplug/pciehp.h      | 12 ++++--
 drivers/pci/hotplug/pciehp_core.c |  7 ++-
 drivers/pci/hotplug/pciehp_ctrl.c | 26 +++++------
 drivers/pci/hotplug/pciehp_hpc.c  | 72 +++++++------------------------
 include/uapi/linux/pci_regs.h     |  1 +
 5 files changed, 45 insertions(+), 73 deletions(-)

-- 
2.21.0