Hi Ludovic, I'm trying to use a wlan sdio TI wl1271 module with an at91sam9263 processor. The wlan card is correctly recognized by the kernel but once the driver tries to initialize the card, then I observe sdio timeouts. I enabled the traces in the atmel-mci driver and here is what I see when the problem occurs (kernel v3.11): [ 31.690000] atmel_mci fff84000.mmc: FSM: state=0 [ 31.900000] atmel_mci fff84000.mmc: MRQ: cmd 53 [ 31.900000] atmel_mci fff84000.mmc: start request: cmd 53 [ 31.900000] atmel_mci fff84000.mmc: IRQ: tx buffer empty [ 31.900000] atmel_mci fff84000.mmc: (atmci_pdc_complete) set pending xfer complete [ 31.900000] atmel_mci fff84000.mmc: IRQ: cmd ready [ 31.900000] atmel_mci fff84000.mmc: set pending cmd rdy [ 31.900000] atmel_mci fff84000.mmc: FSM: state=1 [ 31.900000] atmel_mci fff84000.mmc: FSM: cmd ready? [ 31.900000] atmel_mci fff84000.mmc: set completed cmd ready [ 31.900000] atmel_mci fff84000.mmc: command with data transfer [ 31.900000] atmel_mci fff84000.mmc: FSM: state=2 [ 31.900000] atmel_mci fff84000.mmc: FSM: xfer complete? [ 31.900000] atmel_mci fff84000.mmc: (atmci_tasklet_func) set completed xfer complete [ 31.900000] atmel_mci fff84000.mmc: FSM: state=3 [ 31.900000] atmel_mci fff84000.mmc: FSM: not busy? [ 33.900000] atmel_mci fff84000.mmc: software timeout [ 33.900000] atmel_mci fff84000.mmc: FSM: state=5 [ 33.900000] atmel_mci fff84000.mmc: FSM: state=0 The driver uses PDC mode to perform the transfers, the chip version is 0x210. The data transferred in cmd53 is 4 bytes long. It looks like the chip never sets the 'ATMCI_BLKE' flag. After the problem occured I observe this trace: [ 37.650000] mmc_host mmc0: WARNING: IMR=0x00000008 The same wlan module on an at91sam9g45 (mci version: 0x410) in DMA mode works without problem. I also tested a Marvell 8385 (which uses the libertas driver) on at91sam9263 and it looks to work, I don't see any SDIO timeout. For this chip, the datasize sent is always >= 16 bytes. I'm wondering if the Errata "MMC data write operation with less than 12 bytes is impossible.", mentionned in the sources (see function atmci_prepare_data()), also applies for this version of the chip? I didn't find this errata in the at91sam9263 datasheet... If anyone has info or suggestions to make it work, please let me know. Thanks, -- Olivier -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
