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reset: socfpga: Poll for reset status after deassert reset

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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 <ley.foon.tan@intel.com>
This commit is contained in:
Ley Foon Tan 2020-01-10 13:48:37 +08:00 committed by Marek Vasut
parent 31a790bee9
commit 9e6082198a
1 changed files with 5 additions and 1 deletions
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6
drivers/reset/reset-socfpga.c
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@ -18,6 +18,7 @@
#include <dm/of_access.h>
#include <env.h>
#include <reset-uclass.h>
#include <wait_bit.h>
#include <linux/bitops.h>
#include <linux/io.h>
#include <linux/sizes.h>
@ -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)