linux-kernel - Re: [PATCH v3 4/4] PCI: pciehp: Remove pciehp_green_led

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Date:   Wed, 28 Aug 2019 09:49:43 +1000
From:   "Oliver O'Halloran" <oohall@...il.com>
To:     Denis Efremov <efremov@...ux.com>
Cc:     Bjorn Helgaas <bhelgaas@...gle.com>,
        Lukas Wunner <lukas@...ner.de>,
        sathyanarayanan kuppuswamy 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>,
        linux-pci@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 4/4] PCI: pciehp: Remove pciehp_green_led_{on,off,blink}()

On Tue, Aug 20, 2019 at 2:09 AM Denis Efremov <efremov@...ux.com> wrote:
>
> Remove pciehp_green_led_{on,off,blink}() and use pciehp_set_indicators()
> instead, since the code is mostly the same.
>
> Signed-off-by: Denis Efremov <efremov@...ux.com>
> ---
>  drivers/pci/hotplug/pciehp.h      |  3 ---
>  drivers/pci/hotplug/pciehp_ctrl.c | 12 ++++++++---
>  drivers/pci/hotplug/pciehp_hpc.c  | 36 -------------------------------
>  3 files changed, 9 insertions(+), 42 deletions(-)
>
> diff --git a/drivers/pci/hotplug/pciehp.h b/drivers/pci/hotplug/pciehp.h
> index acda513f37d7..da429345cf70 100644
> --- a/drivers/pci/hotplug/pciehp.h
> +++ b/drivers/pci/hotplug/pciehp.h
> @@ -170,9 +170,6 @@ void pciehp_get_power_status(struct controller *ctrl, u8 *status);
>  void pciehp_set_indicators(struct controller *ctrl, int pwr, int attn);
>  void pciehp_get_latch_status(struct controller *ctrl, u8 *status);
>  int pciehp_query_power_fault(struct controller *ctrl);
> -void pciehp_green_led_on(struct controller *ctrl);
> -void pciehp_green_led_off(struct controller *ctrl);
> -void pciehp_green_led_blink(struct controller *ctrl);
>  bool pciehp_card_present(struct controller *ctrl);
>  bool pciehp_card_present_or_link_active(struct controller *ctrl);
>  int pciehp_check_link_status(struct controller *ctrl);
> diff --git a/drivers/pci/hotplug/pciehp_ctrl.c b/drivers/pci/hotplug/pciehp_ctrl.c
> index 232f7bfcfce9..862fe86e87cc 100644
> --- a/drivers/pci/hotplug/pciehp_ctrl.c
> +++ b/drivers/pci/hotplug/pciehp_ctrl.c
> @@ -65,7 +65,9 @@ static int board_added(struct controller *ctrl)
>                         return retval;
>         }
>
> -       pciehp_green_led_blink(ctrl);
> +       pciehp_set_indicators(ctrl, PCI_EXP_SLTCTL_PWR_IND_BLINK,
> +                             PCI_EXP_SLTCTL_ATTN_IND_NONE);

I think it woud be good if you provided a helper macro for setting one
of the indicators rather than open coding the _NONE constant. e.g.

#define set_power_indicator(ctrl, x) pciehp_set_indicators(ctrl, (x),
PCI_EXP_SLTCTL_ATTN_IND_NONE);

then you can do:

set_power_indicator(ctrl, PCI_EXP_SLTCTL_PWR_IND_BLINK);

which is a bit nicer to read.