linux-kernel - Re: [PATCH v2 2/7] soc: qcom: smem: Add a feature code getter

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Message-ID: <s7mfapok2tvrp5vfm7dkrmyb7htgfucuuvry4shsl7vrxj7e6y@nosu2a7axjxo>
Date: Thu, 18 Apr 2024 14:06:11 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Konrad Dybcio <konrad.dybcio@...aro.org>
Cc: Bjorn Andersson <andersson@...nel.org>, 
	Rob Clark <robdclark@...il.com>, Abhinav Kumar <quic_abhinavk@...cinc.com>, 
	Sean Paul <sean@...rly.run>, Marijn Suijten <marijn.suijten@...ainline.org>, 
	David Airlie <airlied@...il.com>, Daniel Vetter <daniel@...ll.ch>, Rob Herring <robh@...nel.org>, 
	Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, 
	linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org, 
	freedreno@...ts.freedesktop.org, devicetree@...r.kernel.org, 
	Neil Armstrong <neil.armstrong@...aro.org>
Subject: Re: [PATCH v2 2/7] soc: qcom: smem: Add a feature code getter

On Thu, Apr 18, 2024 at 11:53:31AM +0200, Konrad Dybcio wrote:
> On 18.04.2024 1:39 AM, Dmitry Baryshkov wrote:
> > On Wed, Apr 17, 2024 at 10:02:54PM +0200, Konrad Dybcio wrote:
> >> Recent (SM8550+ ish) Qualcomm SoCs have a new mechanism for precisely
> >> identifying the specific SKU and the precise speed bin (in the general
> >> meaning of this word, anyway): a pair of values called Product Code
> >> and Feature Code.
> >>
> >> Based on this information, we can deduce the available frequencies for
> >> things such as Adreno. In the case of Adreno specifically, Pcode is
> >> useless for non-prototype SoCs.
> >>
> >> Introduce a getter for the feature code and export it.
> >>
> >> Signed-off-by: Konrad Dybcio <konrad.dybcio@...aro.org>
> >> ---
> 
> [...]
> 
> >> +/* Internal feature codes */
> >> +/* Valid values: 0 <= n <= 0xf */
> >> +#define SOCINFO_FC_Yn(n)		(0xf1 + n)
> >> +#define SOCINFO_FC_INT_MAX		SOCINFO_FC_Yn(0x10)
> > 
> > This is 0x101 rather than 0x100 or 0xff. Is that expected?
> 
> Yes, this is "the first invalid one", similar to ENUMNAME_NUM
> 
> > 
> >> +
> >> +/* Product codes */
> >> +#define SOCINFO_PC_UNKNOWN		0
> >> +#define SOCINFO_PCn(n)			(n + 1)
> >> +#define SOCINFO_PC_RESERVE		(BIT(31) - 1)
> > 
> > This patch works on fcodes, why do we have PCode defines here?
> 
> I decided they're useful to keep.. Didn't want to split them to a separate
> patch for no reason.


Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>

-- 
With best wishes
Dmitry