From 9e6082198acca5371dded5fcbede7a53ff4a7ec8 Mon Sep 17 00:00:00 2001 From: Ley Foon Tan Date: Fri, 10 Jan 2020 13:48:37 +0800 Subject: [PATCH] reset: socfpga: Poll for reset status after deassert reset In Cyclone 5 SoC platform, the first USB probing is failed but second probing is success. DWC2 USB driver read gsnpsid register right after de-assert reset, but controller is not ready yet and it returns gsnpsid 0. Polling reset status after de-assert reset to solve the issue. Retry with this fix more than 10 times without issue. Signed-off-by: Ley Foon Tan --- drivers/reset/reset-socfpga.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/drivers/reset/reset-socfpga.c b/drivers/reset/reset-socfpga.c index 93ec9cfdb6..105ce94c71 100644 --- a/drivers/reset/reset-socfpga.c +++ b/drivers/reset/reset-socfpga.c @@ -18,6 +18,7 @@ #include #include #include +#include #include #include #include @@ -80,7 +81,10 @@ static int socfpga_reset_deassert(struct reset_ctl *reset_ctl) int offset = id % (reg_width * BITS_PER_BYTE); clrbits_le32(data->modrst_base + (bank * BANK_INCREMENT), BIT(offset)); - return 0; + + return wait_for_bit_le32(data->modrst_base + (bank * BANK_INCREMENT), + BIT(offset), + false, 500, false); } static int socfpga_reset_request(struct reset_ctl *reset_ctl) -- 2.25.1