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Commit a95a3614 authored by Girish Mahadevan's avatar Girish Mahadevan
Browse files

include: qcom-geni: Correct the mode switch sequence. 



Disable the GSI events when moving to FIFO mode. This could cause issues
when GSI firmware is loaded.

Change-Id: Ib7d1d864b3729661048bc9af3266f28068af8fa8
Signed-off-by: default avatarGirish Mahadevan <girishm@codeaurora.org>
parent d78ef3b5

include/linux/qcom-geni-se.h

+17 −0
Original line number Diff line number Diff line
@@ -87,6 +87,7 @@ struct se_geni_rsc { 
#define SE_GENI_RX_RFR_WATERMARK_REG	(0x814)

#define SE_GENI_M_GP_LENGTH		(0x910)

#define SE_GENI_S_GP_LENGTH		(0x914)

#define SE_GSI_EVENT_EN			(0xE18)

#define SE_IRQ_EN			(0xE1C)

#define SE_HW_PARAM_0			(0xE24)

#define SE_HW_PARAM_1			(0xE28)
@@ -220,6 +221,12 @@ struct se_geni_rsc { 
#define RX_LAST_BYTE_VALID_SHFT	(28)

#define RX_FIFO_WC_MSK		(GENMASK(24, 0))



/* SE_GSI_EVENT_EN fields */

#define DMA_RX_EVENT_EN		(BIT(0))

#define DMA_TX_EVENT_EN		(BIT(1))

#define GENI_M_EVENT_EN		(BIT(2))

#define GENI_S_EVENT_EN		(BIT(3))



/* SE_IRQ_EN fields */

#define DMA_RX_IRQ_EN		(BIT(0))

#define DMA_TX_IRQ_EN		(BIT(1))
@@ -331,9 +338,11 @@ static inline int se_io_set_mode(void __iomem *base, int mode) 
	int ret = 0;

	unsigned int io_mode = 0;

	unsigned int geni_dma_mode = 0;

	unsigned int gsi_event_en = 0;



	io_mode = geni_read_reg(base, SE_IRQ_EN);

	geni_dma_mode = geni_read_reg(base, SE_GENI_DMA_MODE_EN);

	gsi_event_en = geni_read_reg(base, SE_GSI_EVENT_EN);



	switch (mode) {

	case FIFO_MODE:
@@ -341,15 +350,23 @@ static inline int se_io_set_mode(void __iomem *base, int mode) 
		io_mode |= (GENI_M_IRQ_EN | GENI_S_IRQ_EN);

		io_mode |= (DMA_TX_IRQ_EN | DMA_RX_IRQ_EN);

		geni_dma_mode &= ~GENI_DMA_MODE_EN;

		gsi_event_en = 0;

		break;



	}

	case GSI_DMA:

		geni_dma_mode |= GENI_DMA_MODE_EN;

		io_mode &= ~(DMA_TX_IRQ_EN | DMA_RX_IRQ_EN);

		gsi_event_en |= (DMA_RX_EVENT_EN | DMA_TX_EVENT_EN |

					GENI_M_EVENT_EN | GENI_S_EVENT_EN);

		break;

	default:

		ret = -ENXIO;

		goto exit_set_mode;

	}

	geni_write_reg(io_mode, base, SE_IRQ_EN);

	geni_write_reg(geni_dma_mode, base, SE_GENI_DMA_MODE_EN);

	geni_write_reg(gsi_event_en, base, SE_GSI_EVENT_EN);

exit_set_mode:

	return ret;

}