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Commit b176a491 authored by Pratibhasagar V's avatar Pratibhasagar V
Browse files

ARM: dts: msm: Reduce the clocks for SD card slot for MSM8226 



The SD cards functionality on QRD devices are failing
with CRC errors when used with higher clock / bus modes.

So reduce the clock speed for SD card slot.

CRs-Fixed:  491789
Change-Id: I24b8bfe44cee4367c22846747f439365d8795d2e
Signed-off-by: default avatarPratibhasagar V <pratibha@codeaurora.org>
parent 568a7d3d

arch/arm/boot/dts/msm8226-qrd.dtsi

+1 −1
Original line number Diff line number Diff line
@@ -238,7 +238,7 @@ 
	qcom,pad-drv-on = <0x4 0x4 0x4>; /* 10mA, 10mA, 10mA */

	qcom,pad-drv-off = <0x0 0x0 0x0>; /* 2mA, 2mA, 2mA */



	qcom,clk-rates = <400000 25000000 50000000 100000000 200000000>;

	qcom,clk-rates = <400000 25000000 50000000>;



	#address-cells = <0>;

	interrupt-parent = <&sdhc_2>;

drivers/mmc/core/sd.c

+14 −4
Original line number Diff line number Diff line
@@ -26,6 +26,12 @@ 
#include "sd.h"

#include "sd_ops.h"



#define UHS_SDR104_MIN_DTR	(100 * 1000 * 1000)

#define UHS_DDR50_MIN_DTR	(50 * 1000 * 1000)

#define UHS_SDR50_MIN_DTR	(50 * 1000 * 1000)

#define UHS_SDR25_MIN_DTR	(25 * 1000 * 1000)

#define UHS_SDR12_MIN_DTR	(12.5 * 1000 * 1000)



static const unsigned int tran_exp[] = {

	10000,		100000,		1000000,	10000000,

	0,		0,		0,		0
@@ -451,18 +457,22 @@ static void sd_update_bus_speed_mode(struct mmc_card *card) 
	}



	if ((card->host->caps & MMC_CAP_UHS_SDR104) &&

	    (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR104)) {

	    (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR104) &&

	    (card->host->f_max > UHS_SDR104_MIN_DTR)) {

			card->sd_bus_speed = UHS_SDR104_BUS_SPEED;

	} else if ((card->host->caps & MMC_CAP_UHS_DDR50) &&

		   (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_DDR50)) {

		   (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_DDR50) &&

		    (card->host->f_max > UHS_DDR50_MIN_DTR)) {

			card->sd_bus_speed = UHS_DDR50_BUS_SPEED;

	} else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |

		    MMC_CAP_UHS_SDR50)) && (card->sw_caps.sd3_bus_mode &

		    SD_MODE_UHS_SDR50)) {

		    SD_MODE_UHS_SDR50) &&

		    (card->host->f_max > UHS_SDR50_MIN_DTR)) {

			card->sd_bus_speed = UHS_SDR50_BUS_SPEED;

	} else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |

		    MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25)) &&

		   (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR25)) {

		   (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR25) &&

		 (card->host->f_max > UHS_SDR25_MIN_DTR)) {

			card->sd_bus_speed = UHS_SDR25_BUS_SPEED;

	} else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |

		    MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25 |