openwrt/target/linux/bcm27xx/patches-6.1/950-0883-spi-dw-Handle-combined-tx-and-rx-messages.patch

From 8a9c0607ce0daa91c48faefd70ea73bda54ed0ae Mon Sep 17 00:00:00 2001
From: Phil Elwell <phil@raspberrypi.com>
Date: Tue, 29 Nov 2022 10:09:54 +0000
Subject: [PATCH] spi: dw: Handle combined tx and rx messages

Signed-off-by: Phil Elwell <phil@raspberrypi.com>
---
 drivers/spi/spi-dw-core.c | 12 +++++++++---
 drivers/spi/spi-dw-mmio.c |  8 ++++++--
 2 files changed, 15 insertions(+), 5 deletions(-)

--- a/drivers/spi/spi-dw-core.c
+++ b/drivers/spi/spi-dw-core.c
@@ -244,8 +244,11 @@ static irqreturn_t dw_spi_transfer_handl
 	 */
 	if (irq_status & DW_SPI_INT_TXEI) {
 		dw_writer(dws);
-		if (!dws->tx_len)
+		if (!dws->tx_len) {
 			dw_spi_mask_intr(dws, DW_SPI_INT_TXEI);
+			if (!dws->rx_len)
+				spi_finalize_current_transfer(dws->master);
+		}
 	}
 
 	return IRQ_HANDLED;
@@ -372,8 +375,11 @@ static void dw_spi_irq_setup(struct dw_s
 
 	dws->transfer_handler = dw_spi_transfer_handler;
 
-	imask = DW_SPI_INT_TXEI | DW_SPI_INT_TXOI |
-		DW_SPI_INT_RXUI | DW_SPI_INT_RXOI | DW_SPI_INT_RXFI;
+	imask = 0;
+	if (dws->tx_len)
+		imask |= DW_SPI_INT_TXEI | DW_SPI_INT_TXOI;
+	if (dws->rx_len)
+		imask |= DW_SPI_INT_RXUI | DW_SPI_INT_RXOI | DW_SPI_INT_RXFI;
 	dw_spi_umask_intr(dws, imask);
 }
 
--- a/drivers/spi/spi-dw-mmio.c
+++ b/drivers/spi/spi-dw-mmio.c
@@ -20,6 +20,7 @@
 #include <linux/property.h>
 #include <linux/regmap.h>
 #include <linux/reset.h>
+#include <linux/interrupt.h>
 
 #include "spi-dw.h"
 
@@ -280,8 +281,11 @@ static int dw_spi_mmio_probe(struct plat
 	dws->paddr = mem->start;
 
 	dws->irq = platform_get_irq(pdev, 0);
-	if (dws->irq < 0)
-		return dws->irq; /* -ENXIO */
+	if (dws->irq < 0) {
+		if (dws->irq != -ENXIO)
+			return dws->irq; /* -ENXIO */
+		dws->irq = IRQ_NOTCONNECTED;
+	}
 
 	dwsmmio->clk = devm_clk_get(&pdev->dev, NULL);
 	if (IS_ERR(dwsmmio->clk))