drm/mipi-dsi: Introduce mipi_dsi_dcs_write_seq macro

A helper macro that can be used to simplify sending DCS commands.
It is useful in scenarios like panel initialization which can sometimes
involve sending lot of DCS commands.

Signed-off-by: Joel Selvaraj <jo@jsfamily.in>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Link: https://patchwork.freedesktop.org/patch/msgid/BY5PR02MB700952493EEB6F0E77DC8416D9DF9@BY5PR02MB7009.namprd02.prod.outlook.com

diff --git a/include/drm/drm_mipi_dsi.h b/include/drm/drm_mipi_dsi.h
index 51e09a1..91a164b 100644 (file)
--- a/include/drm/drm_mipi_dsi.h
+++ b/include/drm/drm_mipi_dsi.h
@@ -296,6 +296,23 @@ int mipi_dsi_dcs_get_display_brightness(struct mipi_dsi_device *dsi,
                                        u16 *brightness);
 
 /**
+ * mipi_dsi_dcs_write_seq - transmit a DCS command with payload
+ * @dsi: DSI peripheral device
+ * @cmd: Command
+ * @seq: buffer containing data to be transmitted
+ */
+#define mipi_dsi_dcs_write_seq(dsi, cmd, seq...) do {                          \
+               static const u8 d[] = { cmd, seq };                             \
+               struct device *dev = &dsi->dev; \
+               int ret;                                                \
+               ret = mipi_dsi_dcs_write_buffer(dsi, d, ARRAY_SIZE(d)); \
+               if (ret < 0) {                                          \
+                       dev_err_ratelimited(dev, "sending command %#02x failed: %d\n", cmd, ret); \
+                       return ret;                                             \
+               }                                               \
+       } while (0)
+
+/**
  * struct mipi_dsi_driver - DSI driver
  * @driver: device driver model driver
  * @probe: callback for device binding