[PATCH 1/2] drm/mipi-dsi: Add mipi_dsi_dcs_set_tear_scanline_multi

[Tejas Vipin <tejasvipin76@gmail.com>]

mipi_dsi_dcs_set_tear_scanline_multi can heavily benefit from being
converted to a multi style function as it is often called in the context of
similar functions.

Signed-off-by: Tejas Vipin <tejasvipin76@gmail.com>
---
 drivers/gpu/drm/drm_mipi_dsi.c | 31 +++++++++++++++++++++++++++++++
 include/drm/drm_mipi_dsi.h     |  2 ++
 2 files changed, 33 insertions(+)

diff --git a/drivers/gpu/drm/drm_mipi_dsi.c b/drivers/gpu/drm/drm_mipi_dsi.c
index 8d0a866cf1e0..b7ad18c148c2 100644
--- a/drivers/gpu/drm/drm_mipi_dsi.c
+++ b/drivers/gpu/drm/drm_mipi_dsi.c
@@ -1339,6 +1339,9 @@ EXPORT_SYMBOL(mipi_dsi_dcs_set_pixel_format);
  * @dsi: DSI peripheral device
  * @scanline: scanline to use as trigger
  *
+ * This function is deprecated. Use mipi_dsi_dcs_set_tear_scanline_multi()
+ * instead.
+ *
  * Return: 0 on success or a negative error code on failure
  */
 int mipi_dsi_dcs_set_tear_scanline(struct mipi_dsi_device *dsi, u16 scanline)
@@ -1833,6 +1836,34 @@ void mipi_dsi_dcs_set_page_address_multi(struct mipi_dsi_multi_context *ctx,
 }
 EXPORT_SYMBOL(mipi_dsi_dcs_set_page_address_multi);
 
+/**
+ * mipi_dsi_dcs_set_tear_scanline_multi() - set the scanline to use as trigger for
+ *    the Tearing Effect output signal of the display module
+ * @ctx: Context for multiple DSI transactions
+ * @scanline: scanline to use as trigger
+ *
+ * Like mipi_dsi_dcs_set_tear_scanline() but deals with errors in a way that
+ * makes it convenient to make several calls in a row.
+ */
+void mipi_dsi_dcs_set_tear_scanline_multi(struct mipi_dsi_multi_context *ctx,
+					  u16 scanline)
+{
+	struct mipi_dsi_device *dsi = ctx->dsi;
+	struct device *dev = &dsi->dev;
+	int ret;
+
+	if (ctx->accum_err)
+		return;
+
+	ret = mipi_dsi_dcs_set_tear_scanline(dsi, scanline);
+	if (ret < 0) {
+		ctx->accum_err = ret;
+		dev_err(dev, "Failed to set tear scanline: %d\n",
+			ctx->accum_err);
+	}
+}
+EXPORT_SYMBOL(mipi_dsi_dcs_set_tear_scanline_multi);
+
 static int mipi_dsi_drv_probe(struct device *dev)
 {
 	struct mipi_dsi_driver *drv = to_mipi_dsi_driver(dev->driver);
diff --git a/include/drm/drm_mipi_dsi.h b/include/drm/drm_mipi_dsi.h
index 602be6ce081a..c823cc13ad1f 100644
--- a/include/drm/drm_mipi_dsi.h
+++ b/include/drm/drm_mipi_dsi.h
@@ -375,6 +375,8 @@ void mipi_dsi_dcs_set_column_address_multi(struct mipi_dsi_multi_context *ctx,
 					   u16 start, u16 end);
 void mipi_dsi_dcs_set_page_address_multi(struct mipi_dsi_multi_context *ctx,
 					   u16 start, u16 end);
+void mipi_dsi_dcs_set_tear_scanline_multi(struct mipi_dsi_multi_context *ctx,
+					u16 scanline);
 
 /**
  * mipi_dsi_generic_write_seq - transmit data using a generic write packet
-- 
2.46.0