Hi Olivier, On Tue, Dec 03, 2013 at 10:59:28AM +0100, Olivier Sobrie wrote: > 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. Unfortunately I am aware of some issues with sdio modules and PDC mode but I didn't have the time to correct it yet. I have done some fixes but only for the DMA mode. > > 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. > In fact I did some tests with Marvell 8686 and it works well but I have recently heard about issues with other sdio wifi modules... I will work on this topic as soon as possible. > 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... >From the top of my head, I don't remember until which IP version this errata applies. It only involves a controller reset. > > If anyone has info or suggestions to make it work, please let me know. > Regards Ludovic -- 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
