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mmc: sdhci-pci: Fix eMMC driver strength for BYT-based controllers 

BIOS writers have begun the practice of setting 40 ohm eMMC driver strength
even though the eMMC may not support it, on the assumption that the kernel
will validate the value against the eMMC (Extended CSD DRIVER_STRENGTH
[offset 197]) and revert to the default 50 ohm value if 40 ohm is invalid.

This is done to avoid changing the value for different boards.

Putting aside the merits of this approach, it is clear the eMMC's mask
of supported driver strengths is more reliable than the value provided
by BIOS. Add validation accordingly.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Fixes: 51ced59cc0 ("mmc: sdhci-pci: Use ACPI DSM to get driver strength for some Intel devices")
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20200422111629.4899-1-adrian.hunter@intel.com
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Adrian Hunter 2020-04-22 14:16:29 +03:00 committed by Ulf Hansson
parent bb32e1987b
commit 1a8eb6b373
1 changed files with 3 additions and 0 deletions
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3
drivers/mmc/host/sdhci-pci-core.c
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@ -601,6 +601,9 @@ static int intel_select_drive_strength(struct mmc_card *card,
struct sdhci_pci_slot *slot = sdhci_priv(host);
struct intel_host *intel_host = sdhci_pci_priv(slot);
if (!(mmc_driver_type_mask(intel_host->drv_strength) & card_drv))
return 0;
return intel_host->drv_strength;
}