drivers: mipi_dsi: dsi_mcux_2l set SMARDMA slot from dev pixfmt

Previous version hardcoded the SMARTDMA slot to either
RGB565 or RGB565_SWAP, but that would be incorrect
if the pixfmt was RGB888. Use the mipi device
pixfmt to set the slot.

(cherry picked from commit 1e6866e)

Original-Signed-off-by: Mike J. Chen <mjchen@google.com>
GitOrigin-RevId: 1e6866e
Change-Id: I545bc22a496086ed614f97b63351005515536605
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/zephyr/+/4971826
Reviewed-by: Al Semjonovs <asemjonovs@google.com>
Commit-Queue: Al Semjonovs <asemjonovs@google.com>
Tested-by: Al Semjonovs <asemjonovs@google.com>
Tested-by: ChromeOS Prod (Robot) <chromeos-ci-prod@chromeos-bot.iam.gserviceaccount.com>

drivers/mipi_dsi/dsi_mcux_2l.c

@@ -45,6 +45,9 @@ struct mcux_mipi_dsi_config {
 struct mcux_mipi_dsi_data {
 	dsi_handle_t mipi_handle;
 	struct k_sem transfer_sem;
+#ifdef CONFIG_MIPI_DSI_MCUX_2L_SMARTDMA
+	uint8_t dma_slot;
+#endif
 };
 
 
@@ -105,11 +108,7 @@ static int dsi_mcux_tx_color(const struct device *dev, uint8_t channel,
 	dma_cfg.user_data = (struct device *)dev;
 	dma_cfg.head_block = █
 	dma_cfg.block_count = 1;
-	if (IS_ENABLED(CONFIG_MIPI_DSI_MCUX_2L_SWAP16)) {
-		dma_cfg.dma_slot = DMA_SMARTDMA_MIPI_RGB565_DMA_SWAP;
-	} else {
-		dma_cfg.dma_slot = DMA_SMARTDMA_MIPI_RGB565_DMA;
-	}
+	dma_cfg.dma_slot = data->dma_slot;
 	dma_cfg.channel_direction = MEMORY_TO_PERIPHERAL;
 	ret = dma_config(config->smart_dma, 0, &dma_cfg);
 	if (ret < 0) {
@@ -241,6 +240,25 @@ static int dsi_mcux_attach(const struct device *dev,
 	if (!device_is_ready(config->smart_dma)) {
 		return -ENODEV;
 	}
+
+	struct mcux_mipi_dsi_data *data = dev->data;
+
+	switch (mdev->pixfmt) {
+	case MIPI_DSI_PIXFMT_RGB888:
+		data->dma_slot = DMA_SMARTDMA_MIPI_RGB888_DMA;
+		break;
+	case MIPI_DSI_PIXFMT_RGB565:
+		if (IS_ENABLED(CONFIG_MIPI_DSI_MCUX_2L_SWAP16)) {
+			data->dma_slot = DMA_SMARTDMA_MIPI_RGB565_DMA_SWAP;
+		} else {
+			data->dma_slot = DMA_SMARTDMA_MIPI_RGB565_DMA;
+		}
+		break;
+	default:
+		LOG_ERR("SMARTDMA does not support pixel_format %u",
+			mdev->pixfmt);
+		return -ENODEV;
+	}
 #else
 	struct mcux_mipi_dsi_data *data = dev->data;