[PATCH v3 5/5] scsi: ufs: rockchip: initial support for UFS

[Christophe JAILLET]

Le 08/10/2024 à 08:15, Shawn Lin a écrit :
> RK3576 SoC contains a UFS controller, add initial support fot it.

s/fot/for/

> The features are:
> (1) support UFS 2.0 features
> (2) High speed up to HS-G3
> (3) 2RX-2TX lanes
> (4) auto H8 entry and exit
> 
> Software limitation:
> (1) HCE procedure: enbale controller->enbale intr->dme_reset->dme_enable

s/enbale/enable/ 	x 2

> (2) disable unipro timeout values before power mode change
> 
> Signed-off-by: Shawn Lin <shawn.lin at rock-chips.com>
> 

No need for an extra empty line

> ---

...

> +static int ufs_rockchip_common_init(struct ufs_hba *hba)
> +{
> +	struct device *dev = hba->dev;
> +	struct platform_device *pdev = to_platform_device(dev);
> +	struct ufs_rockchip_host *host;
> +	int err;
> +
> +	host = devm_kzalloc(dev, sizeof(*host), GFP_KERNEL);
> +	if (!host)
> +		return -ENOMEM;
> +
> +	/* system control register for hci */
> +	host->ufs_sys_ctrl = devm_platform_ioremap_resource_byname(pdev, "hci_grf");
> +	if (IS_ERR(host->ufs_sys_ctrl))
> +		return dev_err_probe(dev, PTR_ERR(host->ufs_sys_ctrl),
> +					"cannot ioremap for hci system control register\n");
> +
> +	/* system control register for mphy */
> +	host->ufs_phy_ctrl = devm_platform_ioremap_resource_byname(pdev, "mphy_grf");
> +	if (IS_ERR(host->ufs_phy_ctrl))
> +		return dev_err_probe(dev, PTR_ERR(host->ufs_phy_ctrl),
> +				"cannot ioremap for mphy system control register\n");
> +
> +	/* mphy base register */
> +	host->mphy_base = devm_platform_ioremap_resource_byname(pdev, "mphy");
> +	if (IS_ERR(host->mphy_base))
> +		return dev_err_probe(dev, PTR_ERR(host->mphy_base),
> +				"cannot ioremap for mphy base register\n");
> +
> +	host->rst = devm_reset_control_array_get_exclusive(dev);
> +	if (IS_ERR(host->rst))
> +		return dev_err_probe(dev, PTR_ERR(host->rst),
> +				"failed to get reset control\n");
> +
> +	reset_control_assert(host->rst);
> +	usleep_range(1, 2);
> +	reset_control_deassert(host->rst);
> +
> +	host->ref_out_clk = devm_clk_get_enabled(dev, "ref_out");
> +	if (IS_ERR(host->ref_out_clk))
> +		return dev_err_probe(dev, PTR_ERR(host->ref_out_clk),
> +				"ref_out unavailable\n");
> +
> +	host->rst_gpio = devm_gpiod_get(&pdev->dev, "reset", GPIOD_OUT_LOW);
> +	if (IS_ERR(host->rst_gpio))
> +		return dev_err_probe(&pdev->dev, PTR_ERR(host->rst_gpio),
> +				"invalid reset-gpios property in node\n");
> +
> +	host->clks[0].id = "core";
> +	host->clks[1].id = "pclk";
> +	host->clks[2].id = "pclk_mphy";
> +	err = devm_clk_bulk_get_optional(dev, UFS_MAX_CLKS, host->clks);
> +	if (err)
> +		return dev_err_probe(dev, err, "failed to get clocks\n");
> +
> +	err = clk_bulk_prepare_enable(UFS_MAX_CLKS, host->clks);

This has to be undone somewhere, likely at the end of ufs_rockchip_remove().

> +	if (err)
> +		return dev_err_probe(dev, err, "failed to enable clocks\n");
> +
> +	host->hba = hba;
> +
> +	ufshcd_set_variant(hba, host);
> +
> +	return 0;
> +}

...

> +static const struct ufs_hba_variant_ops ufs_hba_rk3576_vops = {
> +	.name = "rk3576",
> +	.init = ufs_rockchip_rk3576_init,
> +	.device_reset = ufs_rockchip_device_reset,
> +	.hce_enable_notify = ufs_rockchip_hce_enable_notify,
> +	.phy_initialization = ufs_rockchip_rk3576_phy_init,
> +};
> +
> +static const struct of_device_id ufs_rockchip_of_match[] = {
> +	{ .compatible = "rockchip,rk3576-ufshc", .data = &ufs_hba_rk3576_vops},

Missing space before ending }

> +	{},

No need for an extra , here.

> +};
> +MODULE_DEVICE_TABLE(of, ufs_rockchip_of_match);

...

> +static void ufs_rockchip_remove(struct platform_device *pdev)
> +{
> +	struct ufs_hba *hba = platform_get_drvdata(pdev);
> +	struct ufs_rockchip_host *host = ufshcd_get_variant(hba);
> +
> +	pm_runtime_forbid(&pdev->dev);
> +	pm_runtime_get_noresume(&pdev->dev);
> +	ufshcd_remove(hba);
> +	ufshcd_dealloc_host(hba);
> +	clk_disable_unprepare(host->ref_out_clk);

No need for clk_disable_unprepare(), ref_out_clk comes from 
devm_clk_get_enabled(), so the framework will already call 
clk_disable_unprepare().

> +}

...

CJ