dmaengine: omap: Add support for pause/resume in cyclic dma mode
The audio stack used omap_stop_dma/omap_start_dma to pause/resume the DMA. This method has been used for years on OMAP based products. We only allow pause/resume when the DMA has been configured in cyclic mode which is used by the audio stack. Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com> Acked-by: Vinod Koul <vinod.koul@linux.intel.com> Tested-by: Janusz Krzysztofik <jkrzyszt@tis.icnet.pl> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
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@ -34,6 +34,7 @@ struct omap_chan {
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struct dma_slave_config cfg;
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unsigned dma_sig;
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bool cyclic;
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bool paused;
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int dma_ch;
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struct omap_desc *desc;
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@ -470,11 +471,14 @@ static int omap_dma_terminate_all(struct omap_chan *c)
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*/
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if (c->desc) {
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c->desc = NULL;
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omap_stop_dma(c->dma_ch);
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/* Avoid stopping the dma twice */
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if (!c->paused)
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omap_stop_dma(c->dma_ch);
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}
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if (c->cyclic) {
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c->cyclic = false;
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c->paused = false;
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omap_dma_unlink_lch(c->dma_ch, c->dma_ch);
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}
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@ -487,14 +491,30 @@ static int omap_dma_terminate_all(struct omap_chan *c)
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static int omap_dma_pause(struct omap_chan *c)
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{
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/* FIXME: not supported by platform private API */
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return -EINVAL;
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/* Pause/Resume only allowed with cyclic mode */
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if (!c->cyclic)
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return -EINVAL;
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if (!c->paused) {
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omap_stop_dma(c->dma_ch);
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c->paused = true;
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}
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return 0;
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}
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static int omap_dma_resume(struct omap_chan *c)
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{
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/* FIXME: not supported by platform private API */
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return -EINVAL;
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/* Pause/Resume only allowed with cyclic mode */
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if (!c->cyclic)
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return -EINVAL;
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if (c->paused) {
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omap_start_dma(c->dma_ch);
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c->paused = false;
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}
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return 0;
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}
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static int omap_dma_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd,
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