2009-11-04 03:59:04 MMC error using uclinux 2009R1?
Tony Liu (CHINA)
Message: 82051
CPU: BF531 V0.5
OS: uclinux-2009R1
Boot info:
mmc_spi spi0.3: ASSUMING 3.2-3.4 V slot power
mmc_spi spi0.3: SD/MMC host mmc0, no DMA, no WP, no poweroff
Freeing unused kernel memory: 5068k freed
mmc_spi spi0.3: requested mode not fully supported
mmc_spi spi0.3: can't change chip-select polarity
dma_alloc_init: dma_page @ 0x00187000 - 1024 pages at 0x01c00000
mmc0: error -110 whilst initialising SD card
Source code：linux-2.6.x\arch\blackfin\mach-bf533\boards\ezkit.c
#if defined(CONFIG_MMC_SPI) || defined(CONFIG_MMC_SPI_MODULE)
#define MMC_SPI_CARD_DETECT_INT IRQ_PF5
static int bfin_mmc_spi_init(struct device *dev, irqreturn_t (*detect_int)(int, void *), void *data)
{
return request_irq(MMC_SPI_CARD_DETECT_INT, detect_int,IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING,
"mmc-spi-detect", data);
}
static void bfin_mmc_spi_exit(struct device *dev, void *data)
{
free_irq(MMC_SPI_CARD_DETECT_INT, data);
}
static struct mmc_spi_platform_data bfin_mmc_spi_pdata = {
.init = bfin_mmc_spi_init,
.exit = bfin_mmc_spi_exit,
.detect_delay = 100, /* msecs */
};
static struct bfin5xx_spi_chip mmc_spi_chip_info = {
.enable_dma = 0,
.bits_per_word = 8,
};
#endif
static struct spi_board_info bfin_spi_board_info[] __initdata = {
...........................
#if defined(CONFIG_MMC_SPI) || defined(CONFIG_MMC_SPI_MODULE)
{
.modalias = "mmc_spi",
.max_speed_hz = 20000000, /* max spi clock (SCK) speed in HZ */
.bus_num = 0,
.chip_select = 3,
.platform_data = &bfin_mmc_spi_pdata,
.controller_data = &mmc_spi_chip_info,
.mode = SPI_MODE_3,
},
#endif
...........................
}
root:/> cat /proc/gpio
GPIO_0: scl GPIO INPUT
GPIO_1: sda GPIO INPUT
GPIO_3: mmc_spi Peripheral
GPIO_5: gpio-irq38 GPIO INPUT
root:/> cat /proc/devices
Character devices:
1 mem
5 /dev/tty
5 /dev/console
5 /dev/ptmx
10 misc
128 ptm
136 pts
204 ttyBF
254 rtc
Block devices:
1 ramdisk
259 blkext
179 mmc
Insert the SD card again & again, system report:
root:/> mmc_spi spi0.3: requested mode not fully supported
mmc_spi spi0.3: can't change chip-select polarity
mmc_spi spi0.3: requested mode not fully supported
mmc_spi spi0.3: can't change chip-select polarity
mmc0: error -110 whilst initialising SD card
mmc_spi spi0.3: requested mode not fully supported
mmc_spi spi0.3: can't change chip-select polarity
mmc_spi spi0.3: requested mode not fully supported
mmc_spi spi0.3: can't change chip-select polarity
mmc0: error -84 whilst initialising SD card
Why & How to do?
Thanks！
QuoteReplyEditDelete
2009-11-04 10:53:01 Re: MMC error using uclinux 2009R1?
Ian Jeffray (UNITED KINGDOM)
Message: 82058
Hi Tony,
I've also had a lot of trouble with the new MMC driver. Basically I can't get it to work at all unless the SD card is in the slot at bootup. If it's ever removed, it never works again until a powercycle. I got all the same errors as you too... but I noticed that not all of Wolfgang Muees's patches have been applied... I added the last one myself, which did seem to help things.... check this thread carefully, especially message ID 72042:
I'm also only getting mediocre performance out of the SD interface, even with an insane £80 SanDisk Extreme SDHC 16GB card... only about 1MB/sec.
QuoteReplyEditDelete
2009-11-04 22:19:16 Re: MMC error using uclinux 2009R1?
Yi Li (CHINA)
Message: 82067
Tony,
In many case, the intialization error is caused by missing pull-up resistors - "In order to operate the SD/MMC Cards in SPI Mode 3 it is recommended to have 10kOhm Pull-Up Resistors to VDD on Blackfin SPI_SSELx, SPI_SCK, SPI_MISO and SPI_MOSI. "
See: docs.blackfin.uclinux.org/doku.php?id=linux-kernel:drivers:spi_mmc
Ian,
Wolfgang's posted his patch to LKML, get reviewed and accepted by mainline kernel (2009R1 uses the same mmc spi driver as mainline kernel) - So if you think there are missing patch that may solve your problem, may you can dissuss that on LKML?
For the performance - I think 1MB/sec seems to be reasonable due to the SPI clock frequency.
-Yi