On 22/09/2021 15:46, Akhil R wrote:
On 17/09/2021 15:11, Akhil R wrote:
+static int tegra_dma_slave_config(struct dma_chan *dc,
+ struct dma_slave_config *sconfig) {
+ struct tegra_dma_channel *tdc = to_tegra_dma_chan(dc);
+
+ if (tdc->dma_desc) {
+ dev_err(tdc2dev(tdc), "Configuration not allowed\n");
+ return -EBUSY;
+ }
+
+ memcpy(&tdc->dma_sconfig, sconfig, sizeof(*sconfig));
+ if (tdc->slave_id == -1)
+ tdc->slave_id = sconfig->slave_id;
+
+ tdc->config_init = true;
+ return 0;
+}
So you have a function to reserve a slave ID, but you don't check here if it is
already reserved.
slave-id is reserved considering the direction as well.
'direction' is available only during prep_slave_sg function, I guess.
Sorry I don't understand what you mean by that.
Jon
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