Re: [PATCH v2 3/6] PCI: amlogic: meson: Add support for G12A

Andrew Murray
2019-09-16T13:20:56Z

On Mon, Sep 16, 2019 at 02:50:19PM +0200, Neil Armstrong wrote:
> Add support for the Amlogic G12A SoC using a separate shared PHY.
>
> This adds support for fetching a PHY phandle and call the PHY init,
> reset and power on/off calls instead of writing in the PHY register or
> toggling the PHY reset line.
>
> The MIPI clock and the PHY memory resource are only required for the
> Amlogic AXG SoC PCIe PHY setup, thus these elements are ignored for
> the Amlogic G12A having a separate shared PHY.
>
> Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
> ---
> drivers/pci/controller/dwc/pci-meson.c | 128 ++++++++++++++++++++-----
> 1 file changed, 105 insertions(+), 23 deletions(-)
>
> diff --git a/drivers/pci/controller/dwc/pci-meson.c b/drivers/pci/controller/dwc/pci-meson.c
> index ab79990798f8..3772b02a5c55 100644
> --- a/drivers/pci/controller/dwc/pci-meson.c
> +++ b/drivers/pci/controller/dwc/pci-meson.c
> @@ -16,6 +16,7 @@
> #include <linux/reset.h>
> #include <linux/resource.h>
> #include <linux/types.h>
> +#include <linux/phy/phy.h>
>
> #include "pcie-designware.h"
>
> @@ -96,12 +97,18 @@ struct meson_pcie_rc_reset {
> struct reset_control *apb;
> };
>
> +struct meson_pcie_param {
> + bool has_shared_phy;
> +};
> +
> struct meson_pcie {
> struct dw_pcie pci;
> struct meson_pcie_mem_res mem_res;
> struct meson_pcie_clk_res clk_res;
> struct meson_pcie_rc_reset mrst;
> struct gpio_desc *reset_gpio;
> + struct phy *phy;
> + const struct meson_pcie_param *param;
> };
>
> static struct reset_control *meson_pcie_get_reset(struct meson_pcie *mp,
> @@ -123,10 +130,12 @@ static int meson_pcie_get_resets(struct meson_pcie *mp)
> {
> struct meson_pcie_rc_reset *mrst = &mp->mrst;
>
> - mrst->phy = meson_pcie_get_reset(mp, "phy", PCIE_SHARED_RESET);
> - if (IS_ERR(mrst->phy))
> - return PTR_ERR(mrst->phy);
> - reset_control_deassert(mrst->phy);
> + if (!mp->param->has_shared_phy) {
> + mrst->phy = meson_pcie_get_reset(mp, "phy", PCIE_SHARED_RESET);
> + if (IS_ERR(mrst->phy))
> + return PTR_ERR(mrst->phy);
> + reset_control_deassert(mrst->phy);
> + }
>
> mrst->port = meson_pcie_get_reset(mp, "port", PCIE_NORMAL_RESET);
> if (IS_ERR(mrst->port))
> @@ -180,27 +189,52 @@ static int meson_pcie_get_mems(struct platform_device *pdev,
> if (IS_ERR(mp->mem_res.cfg_base))
> return PTR_ERR(mp->mem_res.cfg_base);
>
> - /* Meson SoC has two PCI controllers use same phy register*/
> - mp->mem_res.phy_base = meson_pcie_get_mem_shared(pdev, mp, "phy");
> - if (IS_ERR(mp->mem_res.phy_base))
> - return PTR_ERR(mp->mem_res.phy_base);
> + /* Meson AXG SoC has two PCI controllers use same phy register */
> + if (!mp->param->has_shared_phy) {
> + mp->mem_res.phy_base =
> + meson_pcie_get_mem_shared(pdev, mp, "phy");
> + if (IS_ERR(mp->mem_res.phy_base))
> + return PTR_ERR(mp->mem_res.phy_base);
> + }
>
> return 0;
> }
>
> -static void meson_pcie_power_on(struct meson_pcie *mp)
> +static int meson_pcie_power_on(struct meson_pcie *mp)
> {
> - writel(MESON_PCIE_PHY_POWERUP, mp->mem_res.phy_base);
> + int ret = 0;
> +
> + if (mp->param->has_shared_phy) {
> + ret = phy_init(mp->phy);
> + if (ret)
> + return ret;
> +
> + ret = phy_power_on(mp->phy);
> + if (ret) {
> + phy_exit(mp->phy);
> + return ret;
> + }
> + } else
> + writel(MESON_PCIE_PHY_POWERUP, mp->mem_res.phy_base);
> +
> + return 0;
> }
>
> -static void meson_pcie_reset(struct meson_pcie *mp)
> +static int meson_pcie_reset(struct meson_pcie *mp)
> {
> struct meson_pcie_rc_reset *mrst = &mp->mrst;
> -
> - reset_control_assert(mrst->phy);
> - udelay(PCIE_RESET_DELAY);
> - reset_control_deassert(mrst->phy);
> - udelay(PCIE_RESET_DELAY);
> + int ret = 0;
> +
> + if (mp->param->has_shared_phy) {
> + ret = phy_reset(mp->phy);
> + if (ret)
> + return ret;
> + } else {
> + reset_control_assert(mrst->phy);
> + udelay(PCIE_RESET_DELAY);
> + reset_control_deassert(mrst->phy);
> + udelay(PCIE_RESET_DELAY);
> + }
>
> reset_control_assert(mrst->port);
> reset_control_assert(mrst->apb);
> @@ -208,6 +242,8 @@ static void meson_pcie_reset(struct meson_pcie *mp)
> reset_control_deassert(mrst->port);
> reset_control_deassert(mrst->apb);
> udelay(PCIE_RESET_DELAY);
> +
> + return 0;
> }
>
> static inline struct clk *meson_pcie_probe_clock(struct device *dev,
> @@ -250,9 +286,11 @@ static int meson_pcie_probe_clocks(struct meson_pcie *mp)
> if (IS_ERR(res->port_clk))
> return PTR_ERR(res->port_clk);
>
> - res->mipi_gate = meson_pcie_probe_clock(dev, "mipi", 0);
> - if (IS_ERR(res->mipi_gate))
> - return PTR_ERR(res->mipi_gate);
> + if (!mp->param->has_shared_phy) {
> + res->mipi_gate = meson_pcie_probe_clock(dev, "mipi", 0);
> + if (IS_ERR(res->mipi_gate))
> + return PTR_ERR(res->mipi_gate);
> + }
>
> res->general_clk = meson_pcie_probe_clock(dev, "general", 0);
> if (IS_ERR(res->general_clk))
> @@ -524,6 +562,7 @@ static const struct dw_pcie_ops dw_pcie_ops = {
>
> static int meson_pcie_probe(struct platform_device *pdev)
> {
> + const struct meson_pcie_param *match_data;
> struct device *dev = &pdev->dev;
> struct dw_pcie *pci;
> struct meson_pcie *mp;
> @@ -537,6 +576,19 @@ static int meson_pcie_probe(struct platform_device *pdev)
> pci->dev = dev;
> pci->ops = &dw_pcie_ops;
>
> + match_data = of_device_get_match_data(dev);
> + if (!match_data) {
> + dev_err(dev, "failed to get match data\n");
> + return -ENODEV;
> + }
> + mp->param = match_data;
> +
> + if (mp->param->has_shared_phy) {
> + mp->phy = devm_phy_get(dev, "pcie");
> + if (IS_ERR(mp->phy))
> + return PTR_ERR(mp->phy);
> + }
> +
> mp->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW);
> if (IS_ERR(mp->reset_gpio)) {
> dev_err(dev, "get reset gpio failed\n");
> @@ -555,13 +607,22 @@ static int meson_pcie_probe(struct platform_device *pdev)
> return ret;
> }
>
> - meson_pcie_power_on(mp);
> - meson_pcie_reset(mp);
> + ret = meson_pcie_power_on(mp);
> + if (ret) {
> + dev_err(dev, "phy power on failed, %d\n", ret);
> + return ret;
> + }
> +
> + ret = meson_pcie_reset(mp);
> + if (ret) {
> + dev_err(dev, "reset failed, %d\n", ret);
> + goto err_phy;
> + }
>
> ret = meson_pcie_probe_clocks(mp);
> if (ret) {
> dev_err(dev, "init clock resources failed, %d\n", ret);
> - return ret;
> + goto err_phy;
> }
>
> platform_set_drvdata(pdev, mp);
> @@ -569,15 +630,36 @@ static int meson_pcie_probe(struct platform_device *pdev)
> ret = meson_add_pcie_port(mp, pdev);
> if (ret < 0) {
> dev_err(dev, "Add PCIe port failed, %d\n", ret);
> - return ret;
> + goto err_phy;
> }
>
> return 0;
> +
> +err_phy:
> + if (mp->param->has_shared_phy) {
> + phy_power_off(mp->phy);
> + phy_exit(mp->phy);
> + }

Interestingly for AXG, if the probe fails we don't seem to do the opposite
of MESON_PCIE_PHY_POWERUP. Though I can see this is a pre-existing issue that
has little impact and probably rarely gets hit, so:

Reviewed-by: Andrew Murray <andrew.murray@arm.com>

However it would be *super really nice* to write a meson_pcie_power_off that
mirrors meson_pcie_power_on that you could call here instead.

Thanks,

Andrew Murray

> +
> + return ret;
> }
>
> +static struct meson_pcie_param meson_pcie_axg_param = {
> + .has_shared_phy = false,
> +};
> +
> +static struct meson_pcie_param meson_pcie_g12a_param = {
> + .has_shared_phy = true,
> +};
> +
> static const struct of_device_id meson_pcie_of_match[] = {
> {
> .compatible = "amlogic,axg-pcie",
> + .data = &meson_pcie_axg_param,
> + },
> + {
> + .compatible = "amlogic,g12a-pcie",
> + .data = &meson_pcie_g12a_param,
> },
> {},
> };
> --
> 2.22.0
>