mmc: sdhci-pci: Quirk for AMD SDHC Device 0x7906
commit 7a869f00 upstream. AMD SDHC 0x7906 requires a hard reset to clear all internal state. Otherwise it can get into a bad state where the DATA lines are always read as zeros. This change requires firmware that can transition the device into D3Cold for it to work correctly. If the firmware does not support transitioning to D3Cold then the power state transitions are a no-op. Signed-off-by: Raul E Rangel <rrangel@chromium.org> Signed-off-by: Shyam Sundar S K <Shyam-sundar.S-k@amd.com> Acked-by: Adrian Hunter <adrian.hunter@intel.com> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org> Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
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