Re: [PATCH v2 06/10] PCI: qcom: Add SM8450 PCIe support

[Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>]

On Wed, Dec 08, 2021 at 08:14:38PM +0300, Dmitry Baryshkov wrote:
> On SM8450 platform PCIe hosts do not use all the clocks (and add several
> additional clocks), so expand the driver to handle these requirements.
> 
> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
> ---
>  drivers/pci/controller/dwc/pcie-qcom.c | 47 +++++++++++++++++++-------
>  1 file changed, 34 insertions(+), 13 deletions(-)
> 
> diff --git a/drivers/pci/controller/dwc/pcie-qcom.c b/drivers/pci/controller/dwc/pcie-qcom.c
> index 803d3ac18c56..ada9c816395d 100644
> --- a/drivers/pci/controller/dwc/pcie-qcom.c
> +++ b/drivers/pci/controller/dwc/pcie-qcom.c
> @@ -161,7 +161,7 @@ struct qcom_pcie_resources_2_3_3 {
>  
>  /* 6 clocks typically, 7 for sm8250 */
>  struct qcom_pcie_resources_2_7_0 {
> -	struct clk_bulk_data clks[7];
> +	struct clk_bulk_data clks[9];
>  	int num_clks;
>  	struct regulator_bulk_data supplies[2];
>  	struct reset_control *pci_reset;
> @@ -196,7 +196,10 @@ struct qcom_pcie_cfg {
>  	const struct qcom_pcie_ops *ops;
>  	/* flags for ops 2.7.0 and 1.9.0 */
>  	unsigned int pipe_clk_need_muxing:1;
> +	unsigned int has_tbu_clk:1;
>  	unsigned int has_ddrss_sf_tbu_clk:1;
> +	unsigned int has_aggre0_clk:1;
> +	unsigned int has_aggre1_clk:1;
>  };
>  
>  struct qcom_pcie {
> @@ -1147,6 +1150,7 @@ static int qcom_pcie_get_resources_2_7_0(struct qcom_pcie *pcie)
>  	struct qcom_pcie_resources_2_7_0 *res = &pcie->res.v2_7_0;
>  	struct dw_pcie *pci = pcie->pci;
>  	struct device *dev = pci->dev;
> +	unsigned int idx;

u32?

>  	int ret;
>  
>  	res->pci_reset = devm_reset_control_get_exclusive(dev, "pci");
> @@ -1160,18 +1164,22 @@ static int qcom_pcie_get_resources_2_7_0(struct qcom_pcie *pcie)
>  	if (ret)
>  		return ret;
>  
> -	res->clks[0].id = "aux";
> -	res->clks[1].id = "cfg";
> -	res->clks[2].id = "bus_master";
> -	res->clks[3].id = "bus_slave";
> -	res->clks[4].id = "slave_q2a";
> -	res->clks[5].id = "tbu";
> -	if (pcie->cfg->has_ddrss_sf_tbu_clk) {
> -		res->clks[6].id = "ddrss_sf_tbu";
> -		res->num_clks = 7;
> -	} else {
> -		res->num_clks = 6;
> -	}
> +	idx = 0;
> +	res->clks[idx++].id = "aux";
> +	res->clks[idx++].id = "cfg";
> +	res->clks[idx++].id = "bus_master";
> +	res->clks[idx++].id = "bus_slave";
> +	res->clks[idx++].id = "slave_q2a";
> +	if (pcie->cfg->has_tbu_clk)
> +		res->clks[idx++].id = "tbu";
> +	if (pcie->cfg->has_ddrss_sf_tbu_clk)
> +		res->clks[idx++].id = "ddrss_sf_tbu";
> +	if (pcie->cfg->has_aggre0_clk)
> +		res->clks[idx++].id = "aggre0";
> +	if (pcie->cfg->has_aggre1_clk)
> +		res->clks[idx++].id = "aggre1";
> +
> +	res->num_clks = idx;

res->num_clks = idx + 1?

Thanks,
Mani

>  
>  	ret = devm_clk_bulk_get(dev, res->num_clks, res->clks);
>  	if (ret < 0)
> @@ -1510,15 +1518,27 @@ static const struct qcom_pcie_cfg ipq4019_cfg = {
>  
>  static const struct qcom_pcie_cfg sdm845_cfg = {
>  	.ops = &ops_2_7_0,
> +	.has_tbu_clk = true,
>  };
>  
>  static const struct qcom_pcie_cfg sm8250_cfg = {
>  	.ops = &ops_1_9_0,
> +	.has_tbu_clk = true,
>  	.has_ddrss_sf_tbu_clk = true,
>  };
>  
> +/* Only for the PCIe0! */
> +static const struct qcom_pcie_cfg sm8450_cfg = {
> +	.ops = &ops_1_9_0,
> +	.has_ddrss_sf_tbu_clk = true,
> +	.pipe_clk_need_muxing = true,
> +	.has_aggre0_clk = true,
> +	.has_aggre1_clk = true,
> +};
> +
>  static const struct qcom_pcie_cfg sc7280_cfg = {
>  	.ops = &ops_1_9_0,
> +	.has_tbu_clk = true,
>  	.pipe_clk_need_muxing = true,
>  };
>  
> @@ -1626,6 +1646,7 @@ static const struct of_device_id qcom_pcie_match[] = {
>  	{ .compatible = "qcom,pcie-sdm845", .data = &sdm845_cfg },
>  	{ .compatible = "qcom,pcie-sm8250", .data = &sm8250_cfg },
>  	{ .compatible = "qcom,pcie-sc8180x", .data = &sm8250_cfg },
> +	{ .compatible = "qcom,pcie-sm8450", .data = &sm8450_cfg },
>  	{ .compatible = "qcom,pcie-sc7280", .data = &sc7280_cfg },
>  	{ }
>  };
> -- 
> 2.33.0
>