mmc: sd: limit SD card power limit according to cards capabilities (d9812780) · Commits · 戴 / test

The SD card specification allows cards to error out a SWITCH command where the requested function in a group is not supported. The spec provides for a set of capabilities which indicate which functions are supported. In the case of the power limit, requesting an unsupported power level via the SWITCH command fails, resulting in the power level remaining at the power-on default of 0.72W, even though the host and card may support higher powers levels. This has been seen with SanDisk 8GB cards, which support the default 0.72W and 1.44W (200mA and 400mA) in combination with an iMX6 host, supporting up to 2.88W (800mA). This currently causes us to try to set a power limit function value of '3' (2.88W) which the card errors out on, and thereby causes the power level to remain at 0.72W rather than the desired 1.44W. Arrange to limit the selected current limit by the capabilities reported by the card to avoid the SWITCH command failing. Select the highest current limit that the host and card combination support. Signed-off-by:

Russell King <rmk+kernel@arm.linux.org.uk> Fixes: ("mmc: core: Simplify and fix for SD switch processing") Signed-off-by:

Ulf Hansson <ulf.hansson@linaro.org>

drivers/mmc/core/sd.c

+16 −4

Original line number	Diff line number	Diff line
		@@ -329,6 +329,7 @@ static int mmc_read_switch(struct mmc_card *card)
		card->sw_caps.sd3_bus_mode = status[13];
		/* Driver Strengths supported by the card */
		card->sw_caps.sd3_drv_type = status[9];
		card->sw_caps.sd3_curr_limit = status[7] \| status[6] << 8;
		}

		out:
		@@ -545,14 +546,25 @@ static int sd_set_current_limit(struct mmc_card card, u8 status)
		* when we set current limit to 200ma, the card will draw 200ma, and
		* when we set current limit to 400/600/800ma, the card will draw its
		* maximum 300ma from the host.
		*
		* The above is incorrect: if we try to set a current limit that is
		* not supported by the card, the card can rightfully error out the
		* attempt, and remain at the default current limit. This results
		* in a 300mA card being limited to 200mA even though the host
		* supports 800mA. Failures seen with SanDisk 8GB UHS cards with
		* an iMX6 host. --rmk
		*/
		if (max_current >= 800)
		if (max_current >= 800 &&
		card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_800)
		current_limit = SD_SET_CURRENT_LIMIT_800;
		else if (max_current >= 600)
		else if (max_current >= 600 &&
		card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_600)
		current_limit = SD_SET_CURRENT_LIMIT_600;
		else if (max_current >= 400)
		else if (max_current >= 400 &&
		card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_400)
		current_limit = SD_SET_CURRENT_LIMIT_400;
		else if (max_current >= 200)
		else if (max_current >= 200 &&
		card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_200)
		current_limit = SD_SET_CURRENT_LIMIT_200;

		if (current_limit != SD_SET_CURRENT_NO_CHANGE) {

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