ANDROID: mmc: sd: Add new CONFIG_MMC_PARANOID_SD_INIT for enabling retries during SD detection (6bb7b604) · Commits · e / devices / android_kernel_fairphone_FP3

drivers/mmc/core/Kconfig

+8 −0

Original line number	Diff line number	Diff line
		@@ -22,3 +22,11 @@ config PWRSEQ_SIMPLE

		This driver can also be built as a module. If so, the module
		will be called pwrseq_simple.

		config MMC_PARANOID_SD_INIT
		bool "Enable paranoid SD card initialization (EXPERIMENTAL)"
		help
		If you say Y here, the MMC layer will be extra paranoid
		about re-trying SD init requests. This can be a useful
		work-around for buggy controllers and hardware. Enable
		if you are experiencing issues with SD detection.

+22 −0

Original line number	Diff line number	Diff line
		@@ -839,6 +839,9 @@ int mmc_sd_setup_card(struct mmc_host host, struct mmc_card card,
		bool reinit)
		{
		int err;
		#ifdef CONFIG_MMC_PARANOID_SD_INIT
		int retries;
		#endif

		if (!reinit) {
		/*
		@@ -865,7 +868,26 @@ int mmc_sd_setup_card(struct mmc_host host, struct mmc_card card,
		/*
		* Fetch switch information from card.
		*/
		#ifdef CONFIG_MMC_PARANOID_SD_INIT
		for (retries = 1; retries <= 3; retries++) {
		err = mmc_read_switch(card);
		if (!err) {
		if (retries > 1) {
		printk(KERN_WARNING
		"%s: recovered\n",
		mmc_hostname(host));
		}
		break;
		} else {
		printk(KERN_WARNING
		"%s: read switch failed (attempt %d)\n",
		mmc_hostname(host), retries);
		}
		}
		#else
		err = mmc_read_switch(card);
		#endif

		if (err)
		return err;
		}