From 0bd6d96d8bd9cfd3d46b3de09c82192251e3d865 Mon Sep 17 00:00:00 2001 From: Ludovic Desroches Date: Wed, 20 Nov 2013 16:01:11 +0100 Subject: [PATCH] mmc: atmel-mci: fix timeout errors in SDIO mode when using DMA With some SDIO devices, timeout errors can happen when reading data. To solve this issue, the DMA transfer has to be activated before sending the command to the device. This order is incorrect in PDC mode. So we have to take care if we are using DMA or PDC to know when to send the MMC command. Cc: stable # 3.2+ Signed-off-by: Ludovic Desroches Acked-by: Nicolas Ferre Signed-off-by: Chris Ball --- drivers/mmc/host/atmel-mci.c | 13 ++++++++++++- 1 file changed, 12 insertions(+), 1 deletion(-) diff --git a/drivers/mmc/host/atmel-mci.c b/drivers/mmc/host/atmel-mci.c index 2cbb4516d353..945a31d77364 100644 --- a/drivers/mmc/host/atmel-mci.c +++ b/drivers/mmc/host/atmel-mci.c @@ -1192,11 +1192,22 @@ static void atmci_start_request(struct atmel_mci *host, iflags |= ATMCI_CMDRDY; cmd = mrq->cmd; cmdflags = atmci_prepare_command(slot->mmc, cmd); - atmci_send_command(host, cmd, cmdflags); + + /* + * DMA transfer should be started before sending the command to avoid + * unexpected errors especially for read operations in SDIO mode. + * Unfortunately, in PDC mode, command has to be sent before starting + * the transfer. + */ + if (host->submit_data != &atmci_submit_data_dma) + atmci_send_command(host, cmd, cmdflags); if (data) host->submit_data(host, data); + if (host->submit_data == &atmci_submit_data_dma) + atmci_send_command(host, cmd, cmdflags); + if (mrq->stop) { host->stop_cmdr = atmci_prepare_command(slot->mmc, mrq->stop); host->stop_cmdr |= ATMCI_CMDR_STOP_XFER; -- 2.39.5