Unverified Commit ad2775dc authored by Ramuthevar Vadivel Murugan's avatar Ramuthevar Vadivel Murugan Committed by Mark Brown
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spi: cadence-quadspi: Disable the DAC for Intel LGM SoC 



On Intel Lightning Mountain(LGM) SoCs QSPI controller do not use
Direct Access Controller(DAC).

This patch adds a quirk to disable the Direct Access Controller
for data transfer instead it uses indirect data transfe

DAC bit resets to 1 so there is no need to explicitly set it.

Signed-off-by: default avatarRamuthevar Vadivel Murugan <vadivel.muruganx.ramuthevar@linux.intel.com>
Link: https://lore.kernel.org/r/20201124041840.31066-3-vadivel.muruganx.ramuthevar@linux.intel.com


Signed-off-by: default avatarMark Brown <broonie@kernel.org>
parent ab2d2875

drivers/spi/spi-cadence-quadspi.c

+11 −4
Original line number Diff line number Diff line
@@ -1384,10 +1384,12 @@ static void cqspi_controller_init(struct cqspi_st *cqspi) 
	writel(cqspi->fifo_depth * cqspi->fifo_width / 8,

	       cqspi->iobase + CQSPI_REG_INDIRECTWRWATERMARK);



	/* Enable Direct Access Controller */

	/* Disable direct access controller */

	if (!cqspi->use_direct_mode) {

		reg = readl(cqspi->iobase + CQSPI_REG_CONFIG);

	reg |= CQSPI_REG_CONFIG_ENB_DIR_ACC_CTRL;

		reg &= ~CQSPI_REG_CONFIG_ENB_DIR_ACC_CTRL;

		writel(reg, cqspi->iobase + CQSPI_REG_CONFIG);

	}



	cqspi_controller_enable(cqspi, 1);

}
@@ -1675,6 +1677,10 @@ static const struct cqspi_driver_platdata am654_ospi = { 
	.quirks = CQSPI_NEEDS_WR_DELAY,

};



static const struct cqspi_driver_platdata intel_lgm_qspi = {

	.quirks = CQSPI_DISABLE_DAC_MODE,

};



static const struct of_device_id cqspi_dt_ids[] = {

	{

		.compatible = "cdns,qspi-nor",
@@ -1690,6 +1696,7 @@ static const struct of_device_id cqspi_dt_ids[] = { 
	},

	{

		.compatible = "intel,lgm-qspi",

		.data = &intel_lgm_qspi,

	},

	{ /* end of table */ }

};