ASoC: fsl-ssi: Add offline_config flag (bd3ca7d1) · Commits · 戴 / test

sound/soc/fsl/fsl_ssi.c

+27 −0

Original line number	Diff line number	Diff line
		@@ -159,6 +159,7 @@ struct fsl_ssi_private {
		bool use_dma;
		bool baudclk_locked;
		bool irq_stats;
		bool offline_config;
		u8 i2s_mode;
		spinlock_t baudclk_lock;
		struct clk *baudclk;
		@@ -1251,6 +1252,32 @@ static int fsl_ssi_probe(struct platform_device *pdev)
		ssi_private->baudclk_locked = false;
		spin_lock_init(&ssi_private->baudclk_lock);

		/*
		* imx51 and later SoCs have a slightly different IP that allows the
		* SSI configuration while the SSI unit is running.
		*
		* More important, it is necessary on those SoCs to configure the
		* sperate TX/RX DMA bits just before starting the stream
		* (fsl_ssi_trigger). The SDMA unit has to be configured before fsl_ssi
		* sends any DMA requests to the SDMA unit, otherwise it is not defined
		* how the SDMA unit handles the DMA request.
		*
		* SDMA units are present on devices starting at imx35 but the imx35
		* reference manual states that the DMA bits should not be changed
		* while the SSI unit is running (SSIEN). So we support the necessary
		* online configuration of fsl-ssi starting at imx51.
		*/
		switch (hw_type) {
		case FSL_SSI_MCP8610:
		case FSL_SSI_MX21:
		case FSL_SSI_MX35:
		ssi_private->offline_config = true;
		break;
		case FSL_SSI_MX51:
		ssi_private->offline_config = false;
		break;
		}

		if (hw_type == FSL_SSI_MX21 \|\| hw_type == FSL_SSI_MX51 \|\|
		hw_type == FSL_SSI_MX35) {
		u32 dma_events[2];