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bus: ti-sysc: Flush posted write on enable before reset
[ Upstream commit34539b442b
] The am335x devices started producing boot errors for resetting musb module in because of subtle timing changes: Unhandled fault: external abort on non-linefetch (0x1008) ... sysc_poll_reset_sysconfig from sysc_reset+0x109/0x12 sysc_reset from sysc_probe+0xa99/0xeb0 ... The fix is to flush posted write after enable before reset during probe. Note that some devices also need to specify the delay after enable with ti,sysc-delay-us, but this is not needed for musb on am335x based on my tests. Reported-by: kernelci.org bot <bot@kernelci.org> Closes: https://storage.kernelci.org/next/master/next-20230614/arm/multi_v7_defconfig+CONFIG_THUMB2_KERNEL=y/gcc-10/lab-cip/baseline-beaglebone-black.html Fixes:596e795569
("bus: ti-sysc: Add support for software reset") Signed-off-by: Tony Lindgren <tony@atomide.com> Signed-off-by: Sasha Levin <sashal@kernel.org>
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@ -2159,6 +2159,8 @@ static int sysc_reset(struct sysc *ddata)
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sysc_val = sysc_read_sysconfig(ddata);
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sysc_val |= sysc_mask;
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sysc_write(ddata, sysc_offset, sysc_val);
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/* Flush posted write */
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sysc_val = sysc_read_sysconfig(ddata);
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}
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if (ddata->cfg.srst_udelay)
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