linux-kernel - Re: [PATCH v5 5/5] PCI: qcom: Add OPP support to scale performance state of power domain

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Message-ID: <20240111033259.7h2jdr76wvkfnges@vireshk-i7>
Date: Thu, 11 Jan 2024 09:02:59 +0530
From: Viresh Kumar <viresh.kumar@...aro.org>
To: Krishna Chaitanya Chundru <quic_krichai@...cinc.com>
Cc: Bjorn Helgaas <helgaas@...nel.org>, agross@...nel.org,
	andersson@...nel.org, konrad.dybcio@...aro.org,
	krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org,
	vireshk@...nel.org, nm@...com, sboyd@...nel.org, mani@...nel.org,
	lpieralisi@...nel.org, kw@...ux.com, robh@...nel.org,
	bhelgaas@...gle.com, rafael@...nel.org,
	linux-arm-msm@...r.kernel.org, linux-pci@...r.kernel.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-pm@...r.kernel.org, quic_vbadigan@...cinc.com,
	quic_nitegupt@...cinc.com, quic_skananth@...cinc.com,
	quic_ramkri@...cinc.com, quic_parass@...cinc.com
Subject: Re: [PATCH v5 5/5] PCI: qcom: Add OPP support to scale performance
 state of power domain

On 10-01-24, 18:28, Krishna Chaitanya Chundru wrote:
> it might be less only for now may be around 20 opp entries, but PCIe spec is
> being updated every few years and a new gen
> 
> gen speed will release, right now PCIe GEN6 is released but I don't we had
> any device in the market now and GEN7 is in process.
> 
> So in future it might become very big table. Either we need to come up with
> a framework in the OPP to select the BW based up on lane width
> 
> for particular speed or use the driver way.

Lets solve the problem the right (current) way for right now and revisit the
whole thing when it gets complex ? So I would suggest configuring the bw via the
OPP framework only, since it takes care of that for all other device types too.

We can surely revisit and try to do it differently if we find some issues going
forward.

-- 
viresh