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[ Upstream commit 9510b38dc0ba358c93cbf5ee7c28820afb85937b ] Adds the MMC_QUIRK_NO_UHS_DDR50_TUNING quirk and updates mmc_execute_tuning() to return 0 if that quirk is set. This fixes an issue on certain Swissbit SD cards that do not support DDR50 tuning where tuning requests caused I/O errors to be thrown. Signed-off-by: Erick Shepherd <erick.shepherd@ni.com> Acked-by: Adrian Hunter <adrian.hunter@intel.com> Link: https://lore.kernel.org/r/20250331221337.1414534-1-erick.shepherd@ni.com Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org> Signed-off-by: Sasha Levin <sashal@kernel.org>