devs/foxbox
1
0
Fork 0
forked from len0rd/rockbox
Code Pull requests Activity

imx233: fix drive strength for sd/mmc

Browse source 
At high speed, we need a drive strength of 8mA on the clock line
to get stable transfers.

Change-Id: Ida668db10cd3e10ad5740e35fd973f2fa394edb2
This commit is contained in:
Amaury Pouly 2013-08-21 11:11:36 +02:00
parent 462adf2a0f
commit 96d355abba
3 changed files with 47 additions and 40 deletions
Download patch file Download diff file Expand all files Collapse all files

20
firmware/target/arm/imx233/sdmmc-imx233.c
View file

@ -206,6 +206,17 @@ static void sdmmc_detect_callback(int ssp)
imx233_ssp_sdmmc_is_detect_inverted(ssp));
}
static void sdmmc_enable_pullups(int drive, bool pullup)
{
/* setup pins, never use alternatives pin on SSP1 because no device use it
* but this could be made a flag */
int bus_width = SDMMC_MODE(drive) == MMC_MODE ? 8 : 4;
if(SDMMC_SSP(drive) == 1)
imx233_ssp_setup_ssp1_sd_mmc_pins(pullup, bus_width, false);
else
imx233_ssp_setup_ssp2_sd_mmc_pins(pullup, bus_width);
}
static void sdmmc_power(int drive, bool on)
{
/* power chip if needed */
@ -223,13 +234,8 @@ static void sdmmc_power(int drive, bool on)
}
if(SDMMC_FLAGS(drive) & POWER_DELAY)
sleep(SDMMC_CONF(drive).power_delay);
/* setup pins, never use alternatives pin on SSP1 because no device use it
* but this could be made a flag */
int bus_width = SDMMC_MODE(drive) == MMC_MODE ? 8 : 4;
if(SDMMC_SSP(drive) == 1)
imx233_ssp_setup_ssp1_sd_mmc_pins(on, bus_width, PINCTRL_DRIVE_4mA, false);
else
imx233_ssp_setup_ssp2_sd_mmc_pins(on, bus_width, PINCTRL_DRIVE_4mA);
/* enable pullups for identification */
sdmmc_enable_pullups(drive, true);
}
#define MCI_NO_RESP 0