linux-kernel - Re: [PATCH v3 01/11] PCI: Update current bus speed as part of pci_pwrctrl

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Message-ID: <10de35f5-bec6-5df3-768d-04f88c4e3d77@linux.intel.com>
Date: Mon, 19 May 2025 16:09:30 +0300 (EEST)
From: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
To: Krishna Chaitanya Chundru <krishna.chundru@....qualcomm.com>
cc: Bjorn Helgaas <bhelgaas@...gle.com>, Jingoo Han <jingoohan1@...il.com>, 
    Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>, 
    Lorenzo Pieralisi <lpieralisi@...nel.org>, 
    Krzysztof Wilczyński <kw@...ux.com>, 
    Rob Herring <robh@...nel.org>, Johannes Berg <johannes@...solutions.net>, 
    Jeff Johnson <jjohnson@...nel.org>, Bartosz Golaszewski <brgl@...ev.pl>, 
    linux-pci@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>, 
    linux-arm-msm@...r.kernel.org, mhi@...ts.linux.dev, 
    linux-wireless@...r.kernel.org, ath11k@...ts.infradead.org, 
    qiang.yu@....qualcomm.com, quic_vbadigan@...cinc.com, 
    quic_vpernami@...cinc.com, quic_mrana@...cinc.com, 
    Jeff Johnson <jeff.johnson@....qualcomm.com>
Subject: Re: [PATCH v3 01/11] PCI: Update current bus speed as part of
 pci_pwrctrl_notify()

On Mon, 19 May 2025, Krishna Chaitanya Chundru wrote:

> If the link is not up till the pwrctl drivers enable power to endpoints
> then cur_bus_speed will not be updated with correct speed.
> 
> As part of rescan, pci_pwrctrl_notify() will be called when new devices
> are added and as part of it update the link bus speed.
> 
> Suggested-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
> Signed-off-by: Krishna Chaitanya Chundru <krishna.chundru@....qualcomm.com>
> ---
>  drivers/pci/pwrctrl/core.c | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/drivers/pci/pwrctrl/core.c b/drivers/pci/pwrctrl/core.c
> index 9cc7e2b7f2b5608ee67c838b6500b2ae4a07ad52..034f0a5d7868fe956e3fc6a9b7ed485bb69caa04 100644
> --- a/drivers/pci/pwrctrl/core.c
> +++ b/drivers/pci/pwrctrl/core.c
> @@ -10,16 +10,21 @@
>  #include <linux/pci-pwrctrl.h>
>  #include <linux/property.h>
>  #include <linux/slab.h>
> +#include "../pci.h"
>  
>  static int pci_pwrctrl_notify(struct notifier_block *nb, unsigned long action,
>  			      void *data)
>  {
>  	struct pci_pwrctrl *pwrctrl = container_of(nb, struct pci_pwrctrl, nb);
>  	struct device *dev = data;
> +	struct pci_bus *bus = to_pci_dev(dev)->bus;
>  
>  	if (dev_fwnode(dev) != dev_fwnode(pwrctrl->dev))
>  		return NOTIFY_DONE;
>  
> +	if (bus->self)
> +		pcie_update_link_speed((struct pci_bus *)bus);

Why are you casting here?? (Perhaps it's a leftover).

> +
>  	switch (action) {
>  	case BUS_NOTIFY_ADD_DEVICE:
>  		/*
> 
> 

-- 
 i.