When booting from USB with UEFI on the ROCKPro64, the Linux kernel EFI stub will hang in efi_exit_boot_services due to OHCI hc_reset accessing the hardware registers after the USB2PHY clocks have been disabled.
As a workaround, prevent the USB2PHY clocks from being disabled to repair the boot.
Signed-off-by: Vincent Stehlé vincent.stehle@arm.com ---
THIS IS A WORKAROUND PLEASE DO NOT APPLY!
drivers/clk/rockchip/clk_rk3399.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/clk/rockchip/clk_rk3399.c b/drivers/clk/rockchip/clk_rk3399.c index f8cbda44551..9cf7d26a026 100644 --- a/drivers/clk/rockchip/clk_rk3399.c +++ b/drivers/clk/rockchip/clk_rk3399.c @@ -1213,10 +1213,10 @@ static int rk3399_clk_disable(struct clk *clk) rk_setreg(&priv->cru->clkgate_con[5], BIT(6)); break; case SCLK_USB2PHY0_REF: - rk_setreg(&priv->cru->clkgate_con[6], BIT(5)); + /* WORKAROUND: leave enabled */ break; case SCLK_USB2PHY1_REF: - rk_setreg(&priv->cru->clkgate_con[6], BIT(6)); + /* WORKAROUND: leave enabled */ break; case ACLK_GMAC: rk_setreg(&priv->cru->clkgate_con[32], BIT(0));