linux-kernel - Re: [PATCH v1 2/3] soc: qcom: llcc: Update configuration data for IPQ5424

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Message-ID: <ZynybsCCp2uvggXA@hu-varada-blr.qualcomm.com>
Date: Tue, 5 Nov 2024 15:54:46 +0530
From: Varadarajan Narayanan <quic_varada@...cinc.com>
To: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
CC: <andersson@...nel.org>, <konradybcio@...nel.org>, <conor@...nel.org>,
        <robh@...nel.org>, <krzk+dt@...nel.org>,
        <linux-arm-msm@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v1 2/3] soc: qcom: llcc: Update configuration data for
 IPQ5424

On Mon, Nov 04, 2024 at 12:04:52PM +0100, Konrad Dybcio wrote:
> On 4.11.2024 8:38 AM, Varadarajan Narayanan wrote:
> > The 'broadcast' register space is present only in chipsets that
> > have multiple instances of LLCC IP. Since IPQ5424 has only one
> > instance, both the LLCC and LLCC_BROADCAST points to the same
> > register space.
> >
> > Signed-off-by: Varadarajan Narayanan <quic_varada@...cinc.com>
> > ---
>
> [...]
>
> > +static const struct llcc_slice_config ipq5424_data[] =  {
> > +	{
> > +		.usecase_id = LLCC_CPUSS,
> > +		.slice_id = 1,
> > +		.max_cap = 768,
> > +		.priority = 1,
> > +		.bonus_ways = 0xFFFF,
> > +		.retain_on_pc = 1,
> > +		.activate_on_init = 1,
> > +		.write_scid_cacheable_en = 1,
> > +		.stale_en = 1,
> > +		.stale_cap_en = 1,
> > +		.alloc_oneway_en = 1,
> > +		.ovcap_en = 1,
> > +		.ovcap_prio = 1,
> > +		.vict_prio = 1,
>
> Many of these are booleans, please use true/false values
>
> [...]
>
> >
> > -	drv_data->bcast_regmap = qcom_llcc_init_mmio(pdev, i, "llcc_broadcast_base");
> > -	if (IS_ERR(drv_data->bcast_regmap)) {
> > -		ret = PTR_ERR(drv_data->bcast_regmap);
> > -		goto err;
> > +	if (num_banks == 1) {
> > +		drv_data->bcast_regmap = regmap;
> > +	} else {
> > +		drv_data->bcast_regmap = qcom_llcc_init_mmio(pdev, i, "llcc_broadcast_base");
> > +		if (IS_ERR(drv_data->bcast_regmap)) {
> > +			ret = PTR_ERR(drv_data->bcast_regmap);
> > +			goto err;
> > +		}
> >  	}
>
> This won't work. See for example
>
> https://lore.kernel.org/linux-arm-msm/20241031-add_llcc_dts_node_for_qcs615-v2-1-205766a607ca@quicinc.com/
>
> Which has both just one bank and llcc_broadcase_base.
>
> You probably want to introduce a quirk like:
>
> if (IS_ERR(drv_data->bcast_regmap)) {
> 	if (cfg->no_broadcast_register)
> 		bcast_regmap = drv_data->regmaps[0];
> 	else {
> 		ret = PTR_ERR(drv_data->bcast_regmap);
> 		goto err;
> 	}
> }

Konrad,

Have posted v2 incorporating the above comments, please review.

Thanks
Varada