On Fri, 6 May 2022 at 05:33, Bjorn Andersson <bjorn.andersson@xxxxxxxxxx> wrote: > > On Mon 25 Apr 13:22 CDT 2022, Robert Marko wrote: > > > Like in IPQ6018 Qualcomm intentionally disables the SW_COLLAPSE on the USB > > GDSC-s in the downstream 5.4 kernel. > > > > This could potentially be better handled by utilizing the GDSC driver, but > > I am not familiar with it nor do I have datasheets. > > Could you please give it a try before we pick this up? > Look at e.g. drivers/clk/qcom/gcc-sdm845.c how usb30_prim_gdsc and > usb30_sec_gdsc are defined, the offsets in specified in .gdscr should be > the same offsets you give below. > > Then you specify an array of struct gdsc *, associating the two gdscs > you have specified to some identifier (USB30_PRIM_GDSC and > USB30_SEC_GDSC is used in sdm845) and reference this list as .gdscs and > num_gdscs in the gcc_ipq8074_desc. > > The last part is to tie the USB controllers to the two GDSCs, this is > done by simply specifying: > > power-domains = <&gcc USB30_PRIM_GDSC>; > > and USB30_SEC_GDSC, in the two USB nodes in DeviceTree. SW_COLLAPSE will > be toggled by the PM state of the USB driver, like it's done on e.g. > sdm845. Hi Bjorn, thanks for the tips, it makes more sense now. The only thing I am not sure about are the feature flags for these GDSCs, how to figure out which ones are correct as I dont have datasheets and QCA does not use GDSCs in the downstream kernel? POLL_CFG_GDSCR will cause the GDSC not to get enabled, while VOTABLE seems to work. Regards, Robert > > Regards, > Bjorn > > > > > Signed-off-by: Robert Marko <robimarko@xxxxxxxxx> > > --- > > drivers/clk/qcom/gcc-ipq8074.c | 5 +++++ > > 1 file changed, 5 insertions(+) > > > > diff --git a/drivers/clk/qcom/gcc-ipq8074.c b/drivers/clk/qcom/gcc-ipq8074.c > > index 2ebd1462db78..65249a03a672 100644 > > --- a/drivers/clk/qcom/gcc-ipq8074.c > > +++ b/drivers/clk/qcom/gcc-ipq8074.c > > @@ -4806,6 +4806,11 @@ static int gcc_ipq8074_probe(struct platform_device *pdev) > > if (IS_ERR(regmap)) > > return PTR_ERR(regmap); > > > > + /* Disable SW_COLLAPSE for USB0 GDSCR */ > > + regmap_update_bits(regmap, 0x3e078, BIT(0), 0x0); > > + /* Disable SW_COLLAPSE for USB1 GDSCR */ > > + regmap_update_bits(regmap, 0x3f078, BIT(0), 0x0); > > + > > clk_alpha_pll_configure(&ubi32_pll_main, regmap, &ubi32_pll_config); > > clk_alpha_pll_configure(&nss_crypto_pll_main, regmap, > > &nss_crypto_pll_config); > > -- > > 2.35.1 > >
