From mboxrd@z Thu Jan 1 00:00:00 1970 From: lee.jones@linaro.org (Lee Jones) Date: Wed, 24 Apr 2013 11:58:42 +0100 Subject: [PATCH] mmc: mmci: Allow MMCI to request channels with information acquired from DT Message-ID: <1366801122-13302-1-git-send-email-lee.jones@linaro.org> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org Currently, if DMA information isn't passed from platform data, then DMA will not be used. This patch allows DMA information obtained though Device Tree to be used as well. Cc: Russell King Cc: Chris Ball Cc: linux-mmc at vger.kernel.org Signed-off-by: Lee Jones --- drivers/mmc/host/mmci.c | 43 ++++++++++++++++++++++--------------------- 1 file changed, 22 insertions(+), 21 deletions(-) diff --git a/drivers/mmc/host/mmci.c b/drivers/mmc/host/mmci.c index 372e921..ecd256b 100644 --- a/drivers/mmc/host/mmci.c +++ b/drivers/mmc/host/mmci.c @@ -304,10 +304,8 @@ static void mmci_dma_setup(struct mmci_host *host) const char *rxname, *txname; dma_cap_mask_t mask; - if (!plat || !plat->dma_filter) { - dev_info(mmc_dev(host->mmc), "no DMA platform data\n"); - return; - } + host->dma_rx_channel = dma_request_slave_channel(dev, "rx"); + host->dma_tx_channel = dma_request_slave_channel(dev, "tx"); /* initialize pre request cookie */ host->next_data.cookie = 1; @@ -316,30 +314,33 @@ static void mmci_dma_setup(struct mmci_host *host) dma_cap_zero(mask); dma_cap_set(DMA_SLAVE, mask); - /* - * If only an RX channel is specified, the driver will - * attempt to use it bidirectionally, however if it is - * is specified but cannot be located, DMA will be disabled. - */ - if (plat->dma_rx_param) { - host->dma_rx_channel = dma_request_channel(mask, + if (plat && plat->dma_filter) { + if (!host->dma_rx_channel && plat->dma_rx_param) { + host->dma_rx_channel = dma_request_channel(mask, plat->dma_filter, plat->dma_rx_param); - /* E.g if no DMA hardware is present */ - if (!host->dma_rx_channel) - dev_err(mmc_dev(host->mmc), "no RX DMA channel\n"); - } + /* E.g if no DMA hardware is present */ + if (!host->dma_rx_channel) + dev_err(mmc_dev(host->mmc), "no RX DMA channel\n"); + } - if (plat->dma_tx_param) { - host->dma_tx_channel = dma_request_channel(mask, + if (!host->dma_tx_channel && plat->dma_tx_param) { + host->dma_tx_channel = dma_request_channel(mask, plat->dma_filter, plat->dma_tx_param); - if (!host->dma_tx_channel) - dev_warn(mmc_dev(host->mmc), "no TX DMA channel\n"); - } else { - host->dma_tx_channel = host->dma_rx_channel; + if (!host->dma_tx_channel) + dev_warn(mmc_dev(host->mmc), "no TX DMA channel\n"); + } } + /* + * If only an RX channel is specified, the driver will + * attempt to use it bidirectionally, however if it is + * is specified but cannot be located, DMA will be disabled. + */ + if (host->dma_rx_channel && !host->dma_tx_channel) + host->dma_tx_channel = host->dma_rx_channel; + if (host->dma_rx_channel) rxname = dma_chan_name(host->dma_rx_channel); else -- 1.7.10.4