| Message ID | 20230629110039.3659309-1-dmitry.baryshkov@linaro.org |
|---|---|
| State | Superseded |
| Headers | show |
| Series | [v2] spi: spi-geni-qcom: enable SPI_CONTROLLER_MUST_TX for GPI DMA mode | expand |
diff --git a/drivers/spi/spi-geni-qcom.c b/drivers/spi/spi-geni-qcom.c index b293428760bc..631c17e629dd 100644 --- a/drivers/spi/spi-geni-qcom.c +++ b/drivers/spi/spi-geni-qcom.c @@ -1100,6 +1100,12 @@ static int spi_geni_probe(struct platform_device *pdev) if (mas->cur_xfer_mode == GENI_SE_FIFO) spi->set_cs = spi_geni_set_cs; + /* + * TX is required per GSI spec, see setup_gsi_xfer(). + */ + if (mas->cur_xfer_mode == GENI_GPI_DMA) + spi->flags = SPI_CONTROLLER_MUST_TX; + ret = request_irq(mas->irq, geni_spi_isr, 0, dev_name(dev), spi); if (ret) goto spi_geni_release_dma;
The GPI DMA mode requires for TX DMA to be prepared. Force SPI core to provide TX buffer even if the caller didn't provide one by setting the SPI_CONTROLLER_MUST_TX flag. This fixes the following oops: Unable to handle kernel NULL pointer dereference at virtual address 0000000000000010 [....] Call trace: gpi_prep_slave_sg+0x3a4/0x5a8 spi_geni_transfer_one+0x190/0x558 spi_transfer_one_message+0x424/0x800 __spi_pump_transfer_message+0x248/0x670 __spi_sync+0x2cc/0x3a8 spi_sync+0x3c/0x68 spidev_sync_read+0xb0/0x108 spidev_read+0x54/0x110 vfs_read+0xc8/0x270 ksys_read+0xec/0x110 __arm64_sys_read+0x24/0x38 invoke_syscall+0x50/0x128 el0_svc_common.constprop.0+0xd4/0x100 do_el0_svc+0x40/0xa8 el0_svc+0x34/0x108 el0t_64_sync_handler+0xf4/0x120 el0t_64_sync+0x190/0x198 Code: 94079d2b 17ffff94 a90573fb f940a660 (f9400b06) Fixes: b59c122484ec ("spi: spi-geni-qcom: Add support for GPI dma") Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org> --- Changes from v1: - Trimmed the backtrace to include only the relevant information --- drivers/spi/spi-geni-qcom.c | 6 ++++++ 1 file changed, 6 insertions(+)