On 06/06/2024 09:01, 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://lore.kernel.org/all/20231013053448.11056-1-piyush.mehta@xxxxxxx
> ---
> 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)) {
> + 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 <<
> + 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 */
And:
/* non-DT (non-ABI) properties */
so someone will not try to make it ABI post-factum.
Best regards,
Krzysztof
