spi-geni-qcom: remove manual CS control

The GPI_DMA mode already uses automatic CS control, to use automatic CS
control for non-GPI case all that's needed is to set the FRAGMENTATION flag
using the same logic as setup_gsi_xfer(). (note clearing SPI_TRANS_CFG's
CS_TOGGLE bit enables automatic CS control, the comment was wrong)

spi_geni_set_cs() is slow, so this is a big performance improvement.

Signed-off-by: Jonathan Marek <jonathan@marek.ca>
Link: https://patch.msgid.link/20251120211204.24078-1-jonathan@marek.ca
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/drivers/spi/spi-geni-qcom.c b/drivers/spi/spi-geni-qcom.c
index a0d8d3425c6c6f9114b9bc7f1c0fa5dd42542942..ed80f49c7b2f3d84c018d6898ed4b6bc92dd88b9 100644 (file)
--- a/drivers/spi/spi-geni-qcom.c
+++ b/drivers/spi/spi-geni-qcom.c
@@ -284,55 +284,6 @@ static bool spi_geni_is_abort_still_pending(struct spi_geni_master *mas)
        return false;
 }
 
-static void spi_geni_set_cs(struct spi_device *slv, bool set_flag)
-{
-       struct spi_geni_master *mas = spi_controller_get_devdata(slv->controller);
-       struct spi_controller *spi = dev_get_drvdata(mas->dev);
-       struct geni_se *se = &mas->se;
-       unsigned long time_left;
-
-       if (!(slv->mode & SPI_CS_HIGH))
-               set_flag = !set_flag;
-
-       if (set_flag == mas->cs_flag)
-               return;
-
-       pm_runtime_get_sync(mas->dev);
-
-       if (spi_geni_is_abort_still_pending(mas)) {
-               dev_err(mas->dev, "Can't set chip select\n");
-               goto exit;
-       }
-
-       spin_lock_irq(&mas->lock);
-       if (mas->cur_xfer) {
-               dev_err(mas->dev, "Can't set CS when prev xfer running\n");
-               spin_unlock_irq(&mas->lock);
-               goto exit;
-       }
-
-       mas->cs_flag = set_flag;
-       /* set xfer_mode to FIFO to complete cs_done in isr */
-       mas->cur_xfer_mode = GENI_SE_FIFO;
-       geni_se_select_mode(se, mas->cur_xfer_mode);
-
-       reinit_completion(&mas->cs_done);
-       if (set_flag)
-               geni_se_setup_m_cmd(se, SPI_CS_ASSERT, 0);
-       else
-               geni_se_setup_m_cmd(se, SPI_CS_DEASSERT, 0);
-       spin_unlock_irq(&mas->lock);
-
-       time_left = wait_for_completion_timeout(&mas->cs_done, HZ);
-       if (!time_left) {
-               dev_warn(mas->dev, "Timeout setting chip select\n");
-               handle_se_timeout(spi, NULL);
-       }
-
-exit:
-       pm_runtime_put(mas->dev);
-}
-
 static void spi_setup_word_len(struct spi_geni_master *mas, u16 mode,
                                        unsigned int bits_per_word)
 {
@@ -728,7 +679,7 @@ static int spi_geni_init(struct spi_geni_master *mas)
                break;
        }
 
-       /* We always control CS manually */
+       /* We never control CS manually */
        if (!spi->target) {
                spi_tx_cfg = readl(se->base + SE_SPI_TRANS_CFG);
                spi_tx_cfg &= ~CS_TOGGLE;
@@ -841,6 +792,7 @@ static int setup_se_xfer(struct spi_transfer *xfer,
                                u16 mode, struct spi_controller *spi)
 {
        u32 m_cmd = 0;
+       u32 m_params = 0;
        u32 len;
        struct geni_se *se = &mas->se;
        int ret;
@@ -904,12 +856,17 @@ static int setup_se_xfer(struct spi_transfer *xfer,
                mas->cur_xfer_mode = GENI_SE_DMA;
        geni_se_select_mode(se, mas->cur_xfer_mode);
 
+       if (!xfer->cs_change) {
+               if (!list_is_last(&xfer->transfer_list, &spi->cur_msg->transfers))
+                       m_params = FRAGMENTATION;
+       }
+
        /*
         * Lock around right before we start the transfer since our
         * interrupt could come in at any time now.
         */
        spin_lock_irq(&mas->lock);
-       geni_se_setup_m_cmd(se, m_cmd, FRAGMENTATION);
+       geni_se_setup_m_cmd(se, m_cmd, m_params);
 
        if (mas->cur_xfer_mode == GENI_SE_DMA) {
                if (m_cmd & SPI_RX_ONLY)
@@ -1148,14 +1105,6 @@ static int spi_geni_probe(struct platform_device *pdev)
        if (ret)
                return ret;
 
-       /*
-        * check the mode supported and set_cs for fifo mode only
-        * for dma (gsi) mode, the gsi will set cs based on params passed in
-        * TRE
-        */
-       if (!spi->target && mas->cur_xfer_mode == GENI_SE_FIFO)
-               spi->set_cs = spi_geni_set_cs;
-
        /*
         * TX is required per GSI spec, see setup_gsi_xfer().
         */