[PATCH v4 2/2] mtd: spi-nor: cadence-quadspi: Disable the auto-poll for Intel LGM SoC

[Ramuthevar,Vadivel MuruganX]

From: Ramuthevar Vadivel Murugan <vadivel.muruganx.ramuthe...@linux.intel.com>

On Intel Lightning Mountain SoCs QSPI controller do not use auto-poll.
This patch disables auto polling when direct access mode is disabled

Signed-off-by: Ramuthevar Vadivel Murugan 
<vadivel.muruganx.ramuthe...@linux.intel.com>
---
 drivers/mtd/spi-nor/cadence-quadspi.c | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/drivers/mtd/spi-nor/cadence-quadspi.c 
b/drivers/mtd/spi-nor/cadence-quadspi.c
index 0ad076eaa81b..c2333f0473e3 100644
--- a/drivers/mtd/spi-nor/cadence-quadspi.c
+++ b/drivers/mtd/spi-nor/cadence-quadspi.c
@@ -88,6 +88,7 @@ struct cqspi_st {
        bool                    rclk_en;
        u32                     trigger_address;
        u32                     wr_delay;
+       bool                    auto_poll;
        struct cqspi_flash_pdata f_pdata[CQSPI_MAX_CHIPSELECT];
 };
 
@@ -136,6 +137,8 @@ struct cqspi_driver_platdata {
 #define CQSPI_REG_RD_INSTR_TYPE_DATA_MASK      0x3
 #define CQSPI_REG_RD_INSTR_DUMMY_MASK          0x1F
 
+#define CQSPI_REG_WR_COMPLETION_CTRL                   0x38
+#define CQSPI_REG_WR_COMPLETION_DISABLE_AUTO_POLL      BIT(14)
 #define CQSPI_REG_WR_INSTR                     0x08
 #define CQSPI_REG_WR_INSTR_OPCODE_LSB          0
 #define CQSPI_REG_WR_INSTR_TYPE_ADDR_LSB       12
@@ -1175,6 +1178,18 @@ static int cqspi_of_get_pdata(struct platform_device 
*pdev)
        return 0;
 }
 
+static int cqspi_disable_auto_poll(struct cqspi_st *cqspi)
+{
+       void __iomem *reg_base = cqspi->iobase;
+       unsigned int reg;
+
+       reg = readl(reg_base + CQSPI_REG_WR_COMPLETION_CTRL);
+       reg |= CQSPI_REG_WR_COMPLETION_DISABLE_AUTO_POLL;
+       writel(reg, reg_base + CQSPI_REG_WR_COMPLETION_CTRL);
+
+       return 0;
+}
+
 static void cqspi_controller_init(struct cqspi_st *cqspi)
 {
        u32 reg;
@@ -1206,6 +1221,10 @@ static void cqspi_controller_init(struct cqspi_st *cqspi)
        reg |= CQSPI_REG_CONFIG_ENB_DIR_ACC_CTRL;
        writel(reg, cqspi->iobase + CQSPI_REG_CONFIG);
 
+       /* Disable auto-polling */
+       if (!cqspi->auto_poll)
+               cqspi_disable_auto_poll(cqspi);
+
        cqspi_controller_enable(cqspi, 1);
 }
 
@@ -1421,6 +1440,9 @@ static int cqspi_probe(struct platform_device *pdev)
                cqspi->wr_delay = 5 * DIV_ROUND_UP(NSEC_PER_SEC,
                                                   cqspi->master_ref_clk_hz);
 
+       if (ddata && (ddata->quirks & CQSPI_DISABLE_DAC_MODE))
+               cqspi->auto_poll = false;
+
        ret = devm_request_irq(dev, irq, cqspi_irq_handler, 0,
                               pdev->name, cqspi);
        if (ret) {
-- 
2.11.0