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[realtek] Work around hardware bug on RTL8211B

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The RTL8211B seems to have a bug that prevents the link from coming up
unless the MII_MMD_DATA register is cleared.

The Linux kernel driver applies this workaround (in rtl8211b_resume())
only to the specific RTL8211B PHY model, along with a matching
workaround to set bit 9 of MII_MMD_DATA when suspending the PHY.
Since we have no need to ever suspend the PHY, and since writing a
zero ought to be harmless, we just clear the register unconditionally.

Debugged-by: Nikolay Pertsev <nikolay.p@cos.flag.org>
Tested-by: Nikolay Pertsev <nikolay.p@cos.flag.org>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
2021-06-22 14:48:10 +01:00
parent 0688114ea6
commit 5622575c5e
2 changed files with 12 additions and 0 deletions
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2
src/include/mii.h
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@@ -23,6 +23,8 @@ FILE_LICENCE ( GPL2_ONLY );
#define MII_EXPANSION 0x06 /* Expansion register */
#define MII_CTRL1000 0x09 /* 1000BASE-T control */
#define MII_STAT1000 0x0a /* 1000BASE-T status */
#define MII_MMD_CTRL 0x0d /* MMD Access Control Register */
#define MII_MMD_DATA 0x0e /* MMD Access Data Register */
#define MII_ESTATUS 0x0f /* Extended Status */
#define MII_DCOUNTER 0x12 /* Disconnect counter */
#define MII_FCSCOUNTER 0x13 /* False carrier counter */