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Date: Thu, 17 Mar 2022 09:31:06 +0000
From: Jon Hunter <jonathanh@...dia.com>
To: Krishna Yarlagadda <kyarlagadda@...dia.com>, broonie@...nel.org,
thierry.reding@...il.com, linux-spi@...r.kernel.org,
linux-tegra@...r.kernel.org, ashishsingha@...dia.com
Cc: skomatineni@...dia.com, ldewangan@...dia.com, robh+dt@...nel.org,
devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/3] spi: tegra210-quad: Add wait polling support
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@...dia.com>
> ---
> 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");
> +
>
> return cdata;
> }
> @@ -1049,6 +1063,7 @@ static int tegra_qspi_combined_seq_xfer(struct tegra_qspi *tqspi,
> bool is_first_msg = true;
> struct spi_transfer *xfer;
> struct spi_device *spi = msg->spi;
> + struct tegra_qspi_client_data *cdata = spi->controller_data;
> u8 transfer_phase = 0;
> u32 cmd1 = 0, dma_ctl = 0;
> int ret = 0;
> @@ -1059,6 +1074,10 @@ static int tegra_qspi_combined_seq_xfer(struct tegra_qspi *tqspi,
> /* Enable Combined sequence mode */
> val = tegra_qspi_readl(tqspi, QSPI_GLOBAL_CONFIG);
> val |= QSPI_CMB_SEQ_EN;
> + if (cdata->wait_polling)
> + val |= QSPI_TPM_WAIT_POLL_EN;
> + else
> + val &= ~QSPI_TPM_WAIT_POLL_EN;
> tegra_qspi_writel(tqspi, val, QSPI_GLOBAL_CONFIG);
> /* Process individual transfer list */
> list_for_each_entry(xfer, &msg->transfers, transfer_list) {
> @@ -1158,6 +1177,8 @@ static int tegra_qspi_combined_seq_xfer(struct tegra_qspi *tqspi,
> transfer_phase++;
> }
>
> + ret = 0;
> +
> exit:
> msg->status = ret;
>
> @@ -1180,6 +1201,7 @@ static int tegra_qspi_non_combined_seq_xfer(struct tegra_qspi *tqspi,
> /* Disable Combined sequence mode */
> val = tegra_qspi_readl(tqspi, QSPI_GLOBAL_CONFIG);
> val &= ~QSPI_CMB_SEQ_EN;
> + val &= ~QSPI_TPM_WAIT_POLL_EN;
> tegra_qspi_writel(tqspi, val, QSPI_GLOBAL_CONFIG);
> list_for_each_entry(transfer, &msg->transfers, transfer_list) {
> struct spi_transfer *xfer = transfer;
> @@ -1439,24 +1461,28 @@ static struct tegra_qspi_soc_data tegra210_qspi_soc_data = {
> .has_dma = true,
> .cmb_xfer_capable = false,
> .cs_count = 1,
> + .has_wait_polling = false,
> };
>
> static struct tegra_qspi_soc_data tegra186_qspi_soc_data = {
> .has_dma = true,
> .cmb_xfer_capable = true,
> .cs_count = 1,
> + .has_wait_polling = false,
> };
>
> static struct tegra_qspi_soc_data tegra234_qspi_soc_data = {
> .has_dma = false,
> .cmb_xfer_capable = true,
> .cs_count = 1,
> + .has_wait_polling = true,
> };
>
> static struct tegra_qspi_soc_data tegra_grace_qspi_soc_data = {
> .has_dma = false,
> .cmb_xfer_capable = true,
> .cs_count = 4,
> + .has_wait_polling = true,
> };
>
> static const struct of_device_id tegra_qspi_of_match[] = {
> @@ -1509,6 +1535,7 @@ static int tegra_qspi_probe(struct platform_device *pdev)
> struct resource *r;
> int ret, qspi_irq;
> int bus_num;
> + u8 val = 0;
>
> master = devm_spi_alloc_master(&pdev->dev, sizeof(*tqspi));
> if (!master)
> @@ -1585,6 +1612,10 @@ static int tegra_qspi_probe(struct platform_device *pdev)
> tqspi->spi_cs_timing1 = tegra_qspi_readl(tqspi, QSPI_CS_TIMING1);
> tqspi->spi_cs_timing2 = tegra_qspi_readl(tqspi, QSPI_CS_TIMING2);
> tqspi->def_command2_reg = tegra_qspi_readl(tqspi, QSPI_COMMAND2);
> + val = tegra_qspi_readl(tqspi, QSPI_GLOBAL_CONFIG);
> + val &= ~QSPI_CMB_SEQ_EN;
> + val &= ~QSPI_TPM_WAIT_POLL_EN;
Don't we need to check here is the device support this TPM_WAIT_POLL?
Jon
--
nvpublic
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