linux-kernel - [PATCH v2 0/4] Simplify PCIe hotplug indicator control

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Message-Id: <20190811195944.23765-1-efremov@linux.com>
Date:   Sun, 11 Aug 2019 22:59:40 +0300
From:   Denis Efremov <efremov@...ux.com>
To:     Bjorn Helgaas <bhelgaas@...gle.com>
Cc:     Lukas Wunner <lukas@...ner.de>, linux-pci@...r.kernel.org,
        linux-kernel@...r.kernel.org, Denis Efremov <efremov@...ux.com>
Subject: [PATCH v2 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.

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: Replace pciehp_set_attention_status()
  PCI: pciehp: Replace pciehp_green_led_{on,off,blink}()

 drivers/pci/hotplug/pciehp.h      | 30 +++++++++++--
 drivers/pci/hotplug/pciehp_ctrl.c | 14 +++---
 drivers/pci/hotplug/pciehp_hpc.c  | 74 +++++++++++--------------------
 include/uapi/linux/pci_regs.h     |  2 +
 4 files changed, 58 insertions(+), 62 deletions(-)

-- 
2.21.0