Re: [PATCH v3] usb: dwc3: enable CCI support for AMD-xilinx DWC3 controller

From: Thinh Nguyen
Date: Fri Jun 07 2024 - 20:09:47 EST

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In reply to: Krzysztof Kozlowski: "Re: [PATCH v3] usb: dwc3: enable CCI support for AMD-xilinx DWC3 controller"
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Hi,

On Thu, Jun 06, 2024, Radhey Shyam Pandey wrote:
> The GSBUSCFG0 register bits [31:16] are used to configure the cache type
> settings of the descriptor and data write/read transfers (Cacheable,
> Bufferable/Posted). When CCI is enabled in the design, DWC3 core GSBUSCFG0
> cache bits must be updated to support CCI enabled transfers in USB.
>
> To program GSBUSCFG0 cache bits create a software node property
> in AMD-xilinx dwc3 glue driver and pass it to dwc3 core. The core
> then reads this property value and configures it in dwc3_core_init()
> sequence.
>
> Signed-off-by: Radhey Shyam Pandey <radhey.shyam.pandey@xxxxxxx>
> ---
> Changes for v3:
> In v2 review as suggested by Thinh Nguyen, switch to swnode implementation
> for passing GSBUSCFG0 cache bits from AMD-xilinx dwc3 glue driver to
> core driver.
>
> Changes for v2:
> Make GSBUSCFG0 configuration specific to AMD-xilinx platform.
> Taken reference from existing commit ec5eb43813a4 ("usb: dwc3: core:
> add support for realtek SoCs custom's global register start address")
>
> v1 link:
> https://urldefense.com/v3/__https://lore.kernel.org/all/20231013053448.11056-1-piyush.mehta@amd.com__;!!A4F2R9G_pg!cOoWxmacxPeYVCxDfg3-xlQLhKm8MIEgwWx45cLQjgwRWA4e4QyY_kGVVHo2m_dcRbpBQEFpB9JsYP6nzasK2AIAsyefjQ$
> ---
> drivers/usb/dwc3/core.c | 24 ++++++++++++++++++++++++
> drivers/usb/dwc3/core.h | 8 ++++++++
> drivers/usb/dwc3/dwc3-xilinx.c | 18 +++++++++++++++++-
> 3 files changed, 49 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
> index 7ee61a89520b..159d21b25629 100644
> --- a/drivers/usb/dwc3/core.c
> +++ b/drivers/usb/dwc3/core.c
> @@ -23,6 +23,7 @@
> #include <linux/delay.h>
> #include <linux/dma-mapping.h>
> #include <linux/of.h>
> +#include <linux/of_address.h>
> #include <linux/of_graph.h>
> #include <linux/acpi.h>
> #include <linux/pinctrl/consumer.h>
> @@ -599,6 +600,19 @@ static void dwc3_cache_hwparams(struct dwc3 *dwc)
> parms->hwparams9 = dwc3_readl(dwc->regs, DWC3_GHWPARAMS9);
> }
>
> +static void dwc3_config_soc_bus(struct dwc3 *dwc)
> +{
> + if (of_dma_is_coherent(dwc->dev->of_node)) {

This can be applicable outside of of_node, do we need this if case?

> + u32 reg;
> +
> + reg = dwc3_readl(dwc->regs, DWC3_GSBUSCFG0);
> + reg &= ~DWC3_GSBUSCFG0_DAT_DES_RD_WR_REQINFO_MASK;
> + reg |= (dwc->acache_data_rd_wr_info <<

What if the user doesn't specify this property? We should not
automatically write 0 by default.

> + DWC3_GSBUSCFG0_DAT_DES_RD_WR_REQINFO_SHIFT);
> + dwc3_writel(dwc->regs, DWC3_GSBUSCFG0, reg);
> + }
> +}
> +
> static int dwc3_core_ulpi_init(struct dwc3 *dwc)
> {
> int intf;
> @@ -1320,6 +1334,8 @@ static int dwc3_core_init(struct dwc3 *dwc)
>
> dwc3_set_incr_burst_type(dwc);
>
> + dwc3_config_soc_bus(dwc);
> +
> ret = dwc3_phy_power_on(dwc);
> if (ret)
> goto err_exit_phy;
> @@ -1574,6 +1590,7 @@ static void dwc3_get_properties(struct dwc3 *dwc)
> u8 tx_max_burst_prd = 0;
> u8 tx_fifo_resize_max_num;
> const char *usb_psy_name;
> + struct device *tmpdev;
> int ret;
>
> /* default to highest possible threshold */
> @@ -1716,6 +1733,13 @@ static void dwc3_get_properties(struct dwc3 *dwc)
> dwc->dis_split_quirk = device_property_read_bool(dev,
> "snps,dis-split-quirk");
>
> + /* Iterate over all parent nodes for finding swnode properties */
> + for (tmpdev = dwc->dev; tmpdev; tmpdev = tmpdev->parent) {
> + device_property_read_u16(tmpdev,
> + "snps,acache-data-rd-wr-info",
> + &dwc->acache_data_rd_wr_info);
> + }
> +

Please split this to a separate function and name it as
dwc3_get_software_properties(). For now, just the new property you
create is fine. We can introduce new patches to move all the software
defined properties (ie. non ABI/DS) there such as sysdev_is_parent.

> dwc->lpm_nyet_threshold = lpm_nyet_threshold;
> dwc->tx_de_emphasis = tx_de_emphasis;
>
> diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h
> index 3781c736c1a1..57b3cb739353 100644
> --- a/drivers/usb/dwc3/core.h
> +++ b/drivers/usb/dwc3/core.h
> @@ -194,6 +194,10 @@
> #define DWC3_GSBUSCFG0_INCRBRSTENA (1 << 0) /* undefined length enable */
> #define DWC3_GSBUSCFG0_INCRBRST_MASK 0xff
>
> +/* Global SoC Bus Configuration Register: AHB-prot/AXI-cache/OCP-ReqInfo */
> +#define DWC3_GSBUSCFG0_DAT_DES_RD_WR_REQINFO_MASK GENMASK(31, 16)

Can we rename this to DWC3_GSBUSCFG0_REQINFO_MASK

> +#define DWC3_GSBUSCFG0_DAT_DES_RD_WR_REQINFO_SHIFT 16

We don't need a shift value. Either define DWC3_GSBUSCFG0_REQINFO(n) or
use FIELD_PREP and the mask.

> +
> /* Global Debug LSP MUX Select */
> #define DWC3_GDBGLSPMUX_ENDBC BIT(15) /* Host only */
> #define DWC3_GDBGLSPMUX_HOSTSELECT(n) ((n) & 0x3fff)
> @@ -1153,6 +1157,9 @@ struct dwc3_scratchpad_array {
> * @num_ep_resized: carries the current number endpoints which have had its tx
> * fifo resized.
> * @debug_root: root debugfs directory for this device to put its files in.
> + * @acache_data_rd_wr_info: store GSBUSCFG0.DATRDREQINFO, DESRDREQINFO,
> + * DATWRREQINFO, and DESWRREQINFO value passed from
> + * glue driver.
> */
> struct dwc3 {
> struct work_struct drd_work;
> @@ -1380,6 +1387,7 @@ struct dwc3 {
> int last_fifo_depth;
> int num_ep_resized;
> struct dentry *debug_root;
> + u16 acache_data_rd_wr_info;

If we do need to keep this field around, please define the default
for unspecified value. Also rename this to gsbuscfg0_reqinfo.

> };
>
> #define INCRX_BURST_MODE 0
> diff --git a/drivers/usb/dwc3/dwc3-xilinx.c b/drivers/usb/dwc3/dwc3-xilinx.c
> index 6095f4dee6ce..f3757bfbd650 100644
> --- a/drivers/usb/dwc3/dwc3-xilinx.c
> +++ b/drivers/usb/dwc3/dwc3-xilinx.c
> @@ -47,6 +47,15 @@ struct dwc3_xlnx {
> struct phy *usb3_phy;
> };
>
> +static const struct property_entry dwc3_xilinx_properties[] = {
> + PROPERTY_ENTRY_U16("snps,acache-data-rd-wr-info", 0xffff),
> + {},
> +};
> +
> +static const struct software_node dwc3_xilinx_swnode = {
> + .properties = dwc3_xilinx_properties,
> +};
> +
> static void dwc3_xlnx_mask_phy_rst(struct dwc3_xlnx *priv_data, bool mask)
> {
> u32 reg;
> @@ -288,10 +297,14 @@ static int dwc3_xlnx_probe(struct platform_device *pdev)
> if (ret)
> goto err_clk_put;
>
> - ret = of_platform_populate(np, NULL, NULL, dev);
> + ret = device_add_software_node(dev, &dwc3_xilinx_swnode);
> if (ret)
> goto err_clk_put;
>
> + ret = of_platform_populate(np, NULL, NULL, dev);
> + if (ret)
> + goto err_remove_swnode;
> +
> pm_runtime_set_active(dev);
> ret = devm_pm_runtime_enable(dev);
> if (ret < 0)
> @@ -303,6 +316,9 @@ static int dwc3_xlnx_probe(struct platform_device *pdev)
> err_pm_set_suspended:
> pm_runtime_set_suspended(dev);
>
> +err_remove_swnode:
> + device_remove_software_node(dev);
> +
> err_clk_put:
> clk_bulk_disable_unprepare(priv_data->num_clocks, priv_data->clks);
>
> --
> 2.34.1
>

Thanks,
Thinh

Next message: Sean Christopherson: "[PATCH] KVM: VMX: Remove unnecessary INVEPT[GLOBAL] from hardware enable path"
Previous message: Sean Christopherson: "[PATCH] KVM: x86/pmu: Add a helper to enable bits in FIXED_CTR_CTRL"
In reply to: Krzysztof Kozlowski: "Re: [PATCH v3] usb: dwc3: enable CCI support for AMD-xilinx DWC3 controller"
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