linux-kernel - Re: [PATCH v3 2/4] PCI: pciehp: Switch LED indicators with a single write

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Message-ID: <20190827223653.GD28404@skuppusw-desk.amr.corp.intel.com>
Date:   Tue, 27 Aug 2019 15:36:53 -0700
From:   Kuppuswamy Sathyanarayanan 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>
To:     Denis Efremov <efremov@...ux.com>
Cc:     Bjorn Helgaas <bhelgaas@...gle.com>,
        Lukas Wunner <lukas@...ner.de>, linux-pci@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 2/4] PCI: pciehp: Switch LED indicators with a single
 write

On Mon, Aug 19, 2019 at 07:06:41PM +0300, Denis Efremov wrote:
> This patch replaces all consecutive switches of power and attention
> indicators with pciehp_set_indicators() call. Thus, performing only
> single write to a register.
> 
> Reviewed-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@...ux.intel.com>
> Reviewed-by: Lukas Wunner <lukas@...ner.de>
> Signed-off-by: Denis Efremov <efremov@...ux.com>
Reviewed-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@...ux.intel.com>
> ---
>  drivers/pci/hotplug/pciehp_ctrl.c | 19 ++++++++++---------
>  drivers/pci/hotplug/pciehp_hpc.c  |  4 ++--
>  2 files changed, 12 insertions(+), 11 deletions(-)
> 
> diff --git a/drivers/pci/hotplug/pciehp_ctrl.c b/drivers/pci/hotplug/pciehp_ctrl.c
> index 631ced0ab28a..232f7bfcfce9 100644
> --- a/drivers/pci/hotplug/pciehp_ctrl.c
> +++ b/drivers/pci/hotplug/pciehp_ctrl.c
> @@ -42,8 +42,8 @@ static void set_slot_off(struct controller *ctrl)
>  		msleep(1000);
>  	}
>  
> -	pciehp_green_led_off(ctrl);
> -	pciehp_set_attention_status(ctrl, 1);
> +	pciehp_set_indicators(ctrl, PCI_EXP_SLTCTL_PWR_IND_OFF,
> +			      PCI_EXP_SLTCTL_ATTN_IND_ON);
>  }
>  
>  /**
> @@ -90,8 +90,8 @@ static int board_added(struct controller *ctrl)
>  		}
>  	}
>  
> -	pciehp_green_led_on(ctrl);
> -	pciehp_set_attention_status(ctrl, 0);
> +	pciehp_set_indicators(ctrl, PCI_EXP_SLTCTL_PWR_IND_ON,
> +			      PCI_EXP_SLTCTL_ATTN_IND_OFF);
>  	return 0;
>  
>  err_exit:
> @@ -172,8 +172,8 @@ void pciehp_handle_button_press(struct controller *ctrl)
>  				  slot_name(ctrl));
>  		}
>  		/* blink green LED and turn off amber */
> -		pciehp_green_led_blink(ctrl);
> -		pciehp_set_attention_status(ctrl, 0);
> +		pciehp_set_indicators(ctrl, PCI_EXP_SLTCTL_PWR_IND_BLINK,
> +				      PCI_EXP_SLTCTL_ATTN_IND_OFF);
>  		schedule_delayed_work(&ctrl->button_work, 5 * HZ);
>  		break;
>  	case BLINKINGOFF_STATE:
> @@ -187,12 +187,13 @@ void pciehp_handle_button_press(struct controller *ctrl)
>  		cancel_delayed_work(&ctrl->button_work);
>  		if (ctrl->state == BLINKINGOFF_STATE) {
>  			ctrl->state = ON_STATE;
> -			pciehp_green_led_on(ctrl);
> +			pciehp_set_indicators(ctrl, PCI_EXP_SLTCTL_PWR_IND_ON,
> +					      PCI_EXP_SLTCTL_ATTN_IND_OFF);
>  		} else {
>  			ctrl->state = OFF_STATE;
> -			pciehp_green_led_off(ctrl);
> +			pciehp_set_indicators(ctrl, PCI_EXP_SLTCTL_PWR_IND_OFF,
> +					      PCI_EXP_SLTCTL_ATTN_IND_OFF);
>  		}
> -		pciehp_set_attention_status(ctrl, 0);
>  		ctrl_info(ctrl, "Slot(%s): Action canceled due to button press\n",
>  			  slot_name(ctrl));
>  		break;
> diff --git a/drivers/pci/hotplug/pciehp_hpc.c b/drivers/pci/hotplug/pciehp_hpc.c
> index 5474b9854a7f..aa4252d11be2 100644
> --- a/drivers/pci/hotplug/pciehp_hpc.c
> +++ b/drivers/pci/hotplug/pciehp_hpc.c
> @@ -667,8 +667,8 @@ static irqreturn_t pciehp_ist(int irq, void *dev_id)
>  	if ((events & PCI_EXP_SLTSTA_PFD) && !ctrl->power_fault_detected) {
>  		ctrl->power_fault_detected = 1;
>  		ctrl_err(ctrl, "Slot(%s): Power fault\n", slot_name(ctrl));
> -		pciehp_set_attention_status(ctrl, 1);
> -		pciehp_green_led_off(ctrl);
> +		pciehp_set_indicators(ctrl, PCI_EXP_SLTCTL_PWR_IND_OFF,
> +				      PCI_EXP_SLTCTL_ATTN_IND_ON);
>  	}
>  
>  	/*
> -- 
> 2.21.0
> 

-- 
-- 
Sathyanarayanan Kuppuswamy
Linux kernel developer