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Kernel: Wait for the ATA busy bit to clear after switching channels

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This is a speculative fix for a flaky boot crash that shows up every now
and then on CI.

Fixes #10177. Hopefully.
This commit is contained in:
Andreas Kling 2022-01-12 01:47:42 +01:00
parent 8177e7eb22
commit 05ed8d1738
Notes: sideshowbarker 2024-07-18 05:37:06 +09:00 
Author: https://github.com/awesomekling
Commit: https://github.com/SerenityOS/serenity/commit/05ed8d17385
1 changed files with 5 additions and 4 deletions
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9
Kernel/Storage/ATA/IDEChannel.cpp
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@ -304,10 +304,11 @@ UNMAP_AFTER_INIT void IDEChannel::detect_disks()
// There are only two possible disks connected to a channel
for (auto i = 0; i < 2; i++) {
// We need to select the drive and then we wait 20 microseconds... and it doesn't hurt anything so let's just do it.
IO::delay(20);
m_io_group.io_base().offset(ATA_REG_HDDEVSEL).out<u8>(0xA0 | (i << 4)); // First, we need to select the drive itself
IO::delay(20);
if (!select_device_and_wait_until_not_busy(i == 0 ? DeviceType::Master : DeviceType::Slave, 32000)) {
dbgln("IDEChannel: Timeout waiting for busy flag to clear during {} {} detection", channel_type_string(), channel_string(i));
continue;
}
auto status = m_io_group.control_base().in<u8>();
if (status == 0x0) {