Re: [PATCH 2/3] spi: tegra210-quad: Add wait polling support

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On 17/03/2022 01:20, Krishna Yarlagadda wrote:
Controller can poll for wait state inserted by TPM device and
handle it.

Signed-off-by: Krishna Yarlagadda <kyarlagadda@xxxxxxxxxx>
---
  drivers/spi/spi-tegra210-quad.c | 31 +++++++++++++++++++++++++++++++
  1 file changed, 31 insertions(+)

diff --git a/drivers/spi/spi-tegra210-quad.c b/drivers/spi/spi-tegra210-quad.c
index a2e225e8f7f0..ecf171bfcdce 100644
--- a/drivers/spi/spi-tegra210-quad.c
+++ b/drivers/spi/spi-tegra210-quad.c
@@ -142,6 +142,7 @@
#define QSPI_GLOBAL_CONFIG 0X1a4
  #define QSPI_CMB_SEQ_EN				BIT(0)
+#define QSPI_TPM_WAIT_POLL_EN			BIT(1)
#define QSPI_CMB_SEQ_ADDR 0x1a8
  #define QSPI_ADDRESS_VALUE_SET(X)		(((x) & 0xFFFF) << 0)
@@ -165,11 +166,13 @@ struct tegra_qspi_soc_data {
  	bool has_dma;
  	bool cmb_xfer_capable;
  	bool cs_count;
+	bool has_wait_polling;
  };
struct tegra_qspi_client_data {
  	int tx_clk_tap_delay;
  	int rx_clk_tap_delay;
+	bool wait_polling;
  };
struct tegra_qspi {
@@ -833,6 +836,11 @@ static u32 tegra_qspi_setup_transfer_one(struct spi_device *spi, struct spi_tran
  		else
  			command1 |= QSPI_CONTROL_MODE_0;
+ if (tqspi->soc_data->cmb_xfer_capable)
+			command1 &= ~QSPI_CS_SW_HW;
+		else
+			command1 |= QSPI_CS_SW_HW;
+
  		if (spi->mode & SPI_CS_HIGH)
  			command1 |= QSPI_CS_SW_VAL;
  		else
@@ -917,6 +925,7 @@ static int tegra_qspi_start_transfer_one(struct spi_device *spi,
static struct tegra_qspi_client_data *tegra_qspi_parse_cdata_dt(struct spi_device *spi)
  {
+	struct tegra_qspi *tqspi = spi_master_get_devdata(spi->master);
  	struct tegra_qspi_client_data *cdata;
cdata = devm_kzalloc(&spi->dev, sizeof(*cdata), GFP_KERNEL);
@@ -927,6 +936,11 @@ static struct tegra_qspi_client_data *tegra_qspi_parse_cdata_dt(struct spi_devic
  				 &cdata->tx_clk_tap_delay);
  	device_property_read_u32(&spi->dev, "nvidia,rx-clk-tap-delay",
  				 &cdata->rx_clk_tap_delay);
+	if (tqspi->soc_data->has_wait_polling)
+		cdata->wait_polling = device_property_read_bool
+					(&spi->dev,
+					 "nvidia,wait-polling");
+


This looks odd. Why do we need this device-tree property if it is already specified in the SoC data?

Jon

--
nvpublic



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