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Message-ID: <66f3bedf-5181-09da-c945-5cc8b8dda381@quicinc.com>
Date: Thu, 15 Jun 2023 12:35:11 +0530
From: Praveen Talari <quic_ptalari@...cinc.com>
To: Konrad Dybcio <konrad.dybcio@...aro.org>, <agross@...nel.org>,
<andersson@...nel.org>, <broonie@...nel.org>,
<linux-arm-msm@...r.kernel.org>, <linux-spi@...r.kernel.org>,
<linux-kernel@...r.kernel.org>
CC: <quic_msavaliy@...cinc.com>, <quic_vtanuku@...cinc.com>,
<quic_vnivarth@...cinc.com>, <quic_arandive@...cinc.com>
Subject: Re: [PATCH 2/2] spi: spi-geni-qcom: Add SPI SLAVE mode support for
GENI based QuPv3
Hi
Thank you for review.
On 6/13/2023 5:57 PM, Konrad Dybcio wrote:
>
> On 13.06.2023 08:52, Praveen Talari wrote:
>> Add SPI SLAVE mode support for GENI based QuPv3.
>>
> Copying the commit title in the commit message is a bit lackluster for
> adding new functionality.
Modified commit message
>> Signed-off-by: Praveen Talari <quic_ptalari@...cinc.com>
>> ---
>> drivers/spi/spi-geni-qcom.c | 55 +++++++++++++++++++++++++++++++++----
>> 1 file changed, 49 insertions(+), 6 deletions(-)
>>
>> diff --git a/drivers/spi/spi-geni-qcom.c b/drivers/spi/spi-geni-qcom.c
>> index 206cc04bb1ed..2e3ae29e79e0 100644
>> --- a/drivers/spi/spi-geni-qcom.c
>> +++ b/drivers/spi/spi-geni-qcom.c
>> @@ -12,6 +12,7 @@
>> #include <linux/platform_device.h>
>> #include <linux/pm_opp.h>
>> #include <linux/pm_runtime.h>
>> +#include <linux/property.h>
>> #include <linux/soc/qcom/geni-se.h>
>> #include <linux/spi/spi.h>
>> #include <linux/spinlock.h>
>> @@ -52,6 +53,9 @@
>> #define SPI_CS_CLK_DELAY_MSK GENMASK(19, 10)
>> #define SPI_CS_CLK_DELAY_SHFT 10
>>
>> +#define SE_SPI_SLAVE_EN (0x2BC)
>> +#define SPI_SLAVE_EN BIT(0)
>> +
>> /* M_CMD OP codes for SPI */
>> #define SPI_TX_ONLY 1
>> #define SPI_RX_ONLY 2
>> @@ -99,6 +103,24 @@ struct spi_geni_master {
>> int cur_xfer_mode;
>> };
>>
>> +static struct spi_master *get_spi_master(struct device *dev)
>> +{
>> + struct platform_device *pdev = to_platform_device(dev);
>> + struct spi_master *spi = platform_get_drvdata(pdev);
>> +
>> + return spi;
>> +}
>> +
>> +static void spi_slv_setup(struct spi_geni_master *mas)
>> +{
>> + struct geni_se *se = &mas->se;
>> +
>> + writel(SPI_SLAVE_EN, se->base + SE_SPI_SLAVE_EN);
>> + writel(GENI_IO_MUX_0_EN, se->base + GENI_OUTPUT_CTRL);
>> + writel(START_TRIGGER, se->base + SE_GENI_CFG_SEQ_START);
>> + dev_info(mas->dev, "spi slave setup done\n");
> dev_dbg
changed to dev_dbg
>
>> +}
>> +
>> static int get_spi_clk_cfg(unsigned int speed_hz,
>> struct spi_geni_master *mas,
>> unsigned int *clk_idx,
>> @@ -140,12 +162,18 @@ static void handle_se_timeout(struct spi_master *spi,
>> const struct spi_transfer *xfer;
>>
>> spin_lock_irq(&mas->lock);
>> - reinit_completion(&mas->cancel_done);
>> if (mas->cur_xfer_mode == GENI_SE_FIFO)
>> writel(0, se->base + SE_GENI_TX_WATERMARK_REG);
>>
>> xfer = mas->cur_xfer;
>> mas->cur_xfer = NULL;
>> +
>> + if (spi->slave) {
>> + spin_unlock_irq(&mas->lock);
>> + goto unmap_if_dma;
>> + }
>> +
>> + reinit_completion(&mas->cancel_done);
> Moving reiniting cancel_done after possibly writing the register
> for both mas/slv cases sounds like a separate change - is it
> necessary?
there will be a chance of double reinit for slave because of goto
statement. Hence moved to down.
>
>> geni_se_cancel_m_cmd(se);
>> spin_unlock_irq(&mas->lock);
>>
>> @@ -541,6 +569,8 @@ static bool geni_can_dma(struct spi_controller *ctlr,
>>
>> if (mas->cur_xfer_mode == GENI_GPI_DMA)
>> return true;
>> + if (ctlr->slave)
>> + return true;
> Regardless of the xfer mode?
we always operates spi slave in dma mode and added code comments
>
>>
>> len = get_xfer_len_in_words(xfer, mas);
>> fifo_size = mas->tx_fifo_depth * mas->fifo_width_bits / mas->cur_bits_per_word;
>> @@ -619,6 +649,7 @@ static void spi_geni_release_dma_chan(struct spi_geni_master *mas)
>>
>> static int spi_geni_init(struct spi_geni_master *mas)
>> {
>> + struct spi_master *spi = get_spi_master(mas->dev);
>> struct geni_se *se = &mas->se;
>> unsigned int proto, major, minor, ver;
>> u32 spi_tx_cfg, fifo_disable;
>> @@ -627,7 +658,14 @@ static int spi_geni_init(struct spi_geni_master *mas)
>> pm_runtime_get_sync(mas->dev);
>>
>> proto = geni_se_read_proto(se);
>> - if (proto != GENI_SE_SPI) {
>> +
>> + if (spi->slave) {
>> + if (proto != GENI_SE_SPI_SLAVE) {
>> + dev_err(mas->dev, "Invalid proto %d\n", proto);
>> + goto out_pm;
>> + }
>> + spi_slv_setup(mas);
>> + } else if (proto != GENI_SE_SPI) {
>> dev_err(mas->dev, "Invalid proto %d\n", proto);
>> goto out_pm;
>> }
>> @@ -677,9 +715,11 @@ static int spi_geni_init(struct spi_geni_master *mas)
>> }
>>
>> /* We always control CS manually */
>> - spi_tx_cfg = readl(se->base + SE_SPI_TRANS_CFG);
>> - spi_tx_cfg &= ~CS_TOGGLE;
>> - writel(spi_tx_cfg, se->base + SE_SPI_TRANS_CFG);
>> + if (!spi->slave) {
>> + spi_tx_cfg = readl(se->base + SE_SPI_TRANS_CFG);
>> + spi_tx_cfg &= ~CS_TOGGLE;
>> + writel(spi_tx_cfg, se->base + SE_SPI_TRANS_CFG);
>> + }
>>
>> out_pm:
>> pm_runtime_put(mas->dev);
>> @@ -1072,6 +1112,9 @@ static int spi_geni_probe(struct platform_device *pdev)
>> pm_runtime_set_autosuspend_delay(&pdev->dev, 250);
>> pm_runtime_enable(dev);
>>
>> + if (device_property_read_bool(&pdev->dev, "qcom,slv-ctrl"))
>> + spi->slave = true;
> Missing dt-bindings
Added dt-binding file
>
> Konrad
>> +
>> ret = geni_icc_get(&mas->se, NULL);
>> if (ret)
>> goto spi_geni_probe_runtime_disable;
>> @@ -1092,7 +1135,7 @@ static int spi_geni_probe(struct platform_device *pdev)
>> * for dma (gsi) mode, the gsi will set cs based on params passed in
>> * TRE
>> */
>> - if (mas->cur_xfer_mode == GENI_SE_FIFO)
>> + if (!spi->slave && mas->cur_xfer_mode == GENI_SE_FIFO)`
>> spi->set_cs = spi_geni_set_cs;
>>
>> ret = request_irq(mas->irq, geni_spi_isr, 0, dev_name(dev), spi);
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