spi: geni-qcom: Add target abort support

SPI target mode currently lacks a mechanism to gracefully abort ongoing
transfers when the client or core needs to cancel active transactions.

Implement spi_geni_target_abort() to handle aborting SPI target
operations when the client and core want to cancel ongoing transfers.
This provides a mechanism for graceful termination of active SPI
transactions in target mode.

Signed-off-by: Praveen Talari <praveen.talari@oss.qualcomm.com>
Reviewed-by: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>
Link: https://patch.msgid.link/20260204162854.1206323-5-praveen.talari@oss.qualcomm.com
Signed-off-by: Mark Brown <broonie@kernel.org>

Author: ptalari27

drivers/spi/spi-geni-qcom.c

@@ -1003,6 +1003,17 @@ static irqreturn_t geni_spi_isr(int irq, void *data)
 	return IRQ_HANDLED;
 }
 
+static int spi_geni_target_abort(struct spi_controller *spi)
+{
+	if (!spi->cur_msg)
+		return 0;
+
+	handle_se_timeout(spi);
+	spi_finalize_current_transfer(spi);
+
+	return 0;
+}
+
 static int spi_geni_probe(struct platform_device *pdev)
 {
 	int ret, irq;
@@ -1076,6 +1087,9 @@ static int spi_geni_probe(struct platform_device *pdev)
 	init_completion(&mas->rx_reset_done);
 	spin_lock_init(&mas->lock);
 
+	if (spi->target)
+		spi->target_abort = spi_geni_target_abort;
+
 	ret = geni_icc_get(&mas->se, NULL);
 	if (ret)
 		return ret;