linux-kernel - Re: [PATCH v3 0/4] Simplify PCIe hotplug indicator control

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Message-ID: <2f4c857e-a7cc-58da-8be5-cba581c56d9f@linux.com>
Date:   Tue, 20 Aug 2019 15:16:43 +0300
From:   Denis Efremov <efremov@...ux.com>
To:     Lukas Wunner <lukas@...ner.de>,
        sathyanarayanan kuppuswamy 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>
Cc:     Bjorn Helgaas <bhelgaas@...gle.com>, linux-pci@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 0/4] Simplify PCIe hotplug indicator control

On 8/19/19 7:06 PM, Denis Efremov wrote:
> 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 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}()

Lukas, Sathyanarayanan, sorry that I've dropped most of yours "Reviewed-by".
The changes in the last 2 patches were significant.

> 
>  drivers/pci/hotplug/pciehp.h      |  5 +-
>  drivers/pci/hotplug/pciehp_core.c |  7 ++-
>  drivers/pci/hotplug/pciehp_ctrl.c | 31 +++++++-----
>  drivers/pci/hotplug/pciehp_hpc.c  | 82 ++++++++++---------------------
>  include/uapi/linux/pci_regs.h     |  3 ++
>  5 files changed, 54 insertions(+), 74 deletions(-)
>