linux-kernel - Re: [PATCH v6 2/4] media: venus: pm_helpers: use opp-table for the frequency

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Message-ID: <a153ba0f-5f73-db6a-b821-5145e3ffc33a@quicinc.com>
Date: Tue, 8 Apr 2025 14:44:17 +0530
From: Vikash Garodia <quic_vgarodia@...cinc.com>
To: Renjiang Han <quic_renjiang@...cinc.com>,
        Stanimir Varbanov
	<stanimir.k.varbanov@...il.com>,
        Bryan O'Donoghue
	<bryan.odonoghue@...aro.org>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        "Rob Herring" <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        "Conor Dooley" <conor+dt@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        "Konrad Dybcio" <konradybcio@...nel.org>
CC: <linux-arm-msm@...r.kernel.org>, <linux-media@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v6 2/4] media: venus: pm_helpers: use opp-table for the
 frequency


On 12/19/2024 11:11 AM, Renjiang Han wrote:
> The frequency value in the opp-table in the device tree and the freq_tbl
> in the driver are the same.
> 
> Therefore, update pm_helpers.c to use the opp-table for frequency values
> for the v4 core.
> If getting data from the opp table fails, fall back to using the frequency
> table.
> 
> Signed-off-by: Renjiang Han <quic_renjiang@...cinc.com>
> ---
>  drivers/media/platform/qcom/venus/pm_helpers.c | 53 +++++++++++++++++++-------
>  1 file changed, 39 insertions(+), 14 deletions(-)
> 
> diff --git a/drivers/media/platform/qcom/venus/pm_helpers.c b/drivers/media/platform/qcom/venus/pm_helpers.c
> index 33a5a659c0ada0ca97eebb5522c5f349f95c49c7..b61c0ad152878870b7223efa274e137d3636433b 100644
> --- a/drivers/media/platform/qcom/venus/pm_helpers.c
> +++ b/drivers/media/platform/qcom/venus/pm_helpers.c
> @@ -43,14 +43,20 @@ static int core_clks_enable(struct venus_core *core)
>  	const struct venus_resources *res = core->res;
>  	const struct freq_tbl *freq_tbl = core->res->freq_tbl;
>  	unsigned int freq_tbl_size = core->res->freq_tbl_size;
> +	struct device *dev = core->dev;
> +	struct dev_pm_opp *opp;
>  	unsigned long freq;
>  	unsigned int i;
>  	int ret;
>  
> -	if (!freq_tbl)
> -		return -EINVAL;
> -
> -	freq = freq_tbl[freq_tbl_size - 1].freq;
> +	opp = dev_pm_opp_find_freq_ceil(dev, &freq);
> +	if (IS_ERR(opp)) {
> +		if (!freq_tbl)
> +			return -EINVAL;
> +		freq = freq_tbl[freq_tbl_size - 1].freq;
> +	} else {
> +		dev_pm_opp_put(opp);
> +	}
>  
>  	for (i = 0; i < res->clks_num; i++) {
>  		if (IS_V6(core)) {
> @@ -627,12 +633,15 @@ min_loaded_core(struct venus_inst *inst, u32 *min_coreid, u32 *min_load, bool lo
>  
>  static int decide_core(struct venus_inst *inst)
>  {
> +	const struct freq_tbl *freq_tbl = inst->core->res->freq_tbl;
>  	const u32 ptype = HFI_PROPERTY_CONFIG_VIDEOCORES_USAGE;
>  	struct venus_core *core = inst->core;
>  	u32 min_coreid, min_load, cur_inst_load;
>  	u32 min_lp_coreid, min_lp_load, cur_inst_lp_load;
>  	struct hfi_videocores_usage_type cu;
> -	unsigned long max_freq;
> +	unsigned long max_freq = ULONG_MAX;
> +	struct device *dev = core->dev;
> +	struct dev_pm_opp *opp;
>  	int ret = 0;
>  
>  	if (legacy_binding) {
> @@ -655,7 +664,11 @@ static int decide_core(struct venus_inst *inst)
>  	cur_inst_lp_load *= inst->clk_data.low_power_freq;
>  	/*TODO : divide this inst->load by work_route */
>  
> -	max_freq = core->res->freq_tbl[0].freq;
> +	opp = dev_pm_opp_find_freq_floor(dev, &max_freq);
> +	if (IS_ERR(opp))
> +		max_freq = freq_tbl[0].freq;
> +	else
> +		dev_pm_opp_put(opp);
>  
>  	min_loaded_core(inst, &min_coreid, &min_load, false);
>  	min_loaded_core(inst, &min_lp_coreid, &min_lp_load, true);
> @@ -1078,7 +1091,9 @@ static int load_scale_v4(struct venus_inst *inst)
>  	unsigned int num_rows = core->res->freq_tbl_size;
>  	struct device *dev = core->dev;
>  	unsigned long freq = 0, freq_core1 = 0, freq_core2 = 0;
> +	unsigned long max_freq = ULONG_MAX;
>  	unsigned long filled_len = 0;
> +	struct dev_pm_opp *opp;
>  	int i, ret = 0;
>  
>  	for (i = 0; i < inst->num_input_bufs; i++)
> @@ -1104,19 +1119,29 @@ static int load_scale_v4(struct venus_inst *inst)
>  
>  	freq = max(freq_core1, freq_core2);
>  
> -	if (freq > table[0].freq) {
> -		dev_dbg(dev, VDBGL "requested clock rate: %lu scaling clock rate : %lu\n",
> -			freq, table[0].freq);
> +	opp = dev_pm_opp_find_freq_floor(dev, &max_freq);
> +	if (IS_ERR(opp))
> +		max_freq = table[0].freq;
> +	else
> +		dev_pm_opp_put(opp);
>  
> -		freq = table[0].freq;
> +	if (freq > max_freq) {
> +		dev_dbg(dev, VDBGL "requested clock rate: %lu scaling clock rate : %lu\n",
> +			freq, max_freq);
> +		freq = max_freq;
>  		goto set_freq;
>  	}
>  
> -	for (i = num_rows - 1 ; i >= 0; i--) {
> -		if (freq <= table[i].freq) {
> -			freq = table[i].freq;
> -			break;
> +	opp = dev_pm_opp_find_freq_ceil(dev, &freq);
> +	if (IS_ERR(opp)) {
> +		for (i = num_rows - 1 ; i >= 0; i--) {
> +			if (freq <= table[i].freq) {
> +				freq = table[i].freq;
> +				break;
> +			}
>  		}
> +	} else {
> +		dev_pm_opp_put(opp);
>  	}
>  
>  set_freq:
> 
Reviewed-by: Vikash Garodia <quic_vgarodia@...cinc.com>