void tmio_mmc_request_dma(struct tmio_mmc_host *host, struct tmio_mmc_data *pdata)
{
/* We can only either use DMA for both Tx and Rx or not use it at all */
- if (pdata->dma) {
+ if (!pdata->dma)
+ return;
+
+ if (!host->chan_tx && !host->chan_rx) {
dma_cap_mask_t mask;
dma_cap_zero(mask);
tasklet_init(&host->dma_complete, tmio_mmc_tasklet_fn, (unsigned long)host);
tasklet_init(&host->dma_issue, tmio_mmc_issue_tasklet_fn, (unsigned long)host);
+ }
- tmio_mmc_enable_dma(host, true);
+ tmio_mmc_enable_dma(host, true);
+
+ return;
- return;
ebouncebuf:
- dma_release_channel(host->chan_rx);
- host->chan_rx = NULL;
+ dma_release_channel(host->chan_rx);
+ host->chan_rx = NULL;
ereqrx:
- dma_release_channel(host->chan_tx);
- host->chan_tx = NULL;
- return;
- }
+ dma_release_channel(host->chan_tx);
+ host->chan_tx = NULL;
}
void tmio_mmc_release_dma(struct tmio_mmc_host *host)