linux-kernel - [PATCH 01/14] drm/mipi-dsi: Add a mipi_dsi_dcs_write

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Message-Id: <20221228014757.3170486-2-javierm@redhat.com>
Date:   Wed, 28 Dec 2022 02:47:44 +0100
From:   Javier Martinez Canillas <javierm@...hat.com>
To:     linux-kernel@...r.kernel.org
Cc:     Javier Martinez Canillas <javierm@...hat.com>,
        Daniel Vetter <daniel@...ll.ch>,
        David Airlie <airlied@...il.com>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        dri-devel@...ts.freedesktop.org
Subject: [PATCH 01/14] drm/mipi-dsi: Add a mipi_dsi_dcs_write_seq() macro

Many panel drivers define dsi_dcs_write_seq() and dsi_generic_write_seq()
macros to send DCS commands and generic write packets respectively, with
the payload specified as a list of parameters instead of using arrays.

There's already a macro for the former, introduced by commit 2a9e9daf75231
("drm/mipi-dsi: Introduce mipi_dsi_dcs_write_seq macro") so drivers can be
changed to use that. But there isn't one yet for the latter, let's add it.

Signed-off-by: Javier Martinez Canillas <javierm@...hat.com>
---

 include/drm/drm_mipi_dsi.h | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/include/drm/drm_mipi_dsi.h b/include/drm/drm_mipi_dsi.h
index 20b21b577dea..c7c458131ba1 100644
--- a/include/drm/drm_mipi_dsi.h
+++ b/include/drm/drm_mipi_dsi.h
@@ -297,6 +297,22 @@ int mipi_dsi_dcs_set_display_brightness(struct mipi_dsi_device *dsi,
 int mipi_dsi_dcs_get_display_brightness(struct mipi_dsi_device *dsi,
 					u16 *brightness);
 
+/**
+ * mipi_dsi_generic_write - transmit data using a generic write packet
+ * @dsi: DSI peripheral device
+ * @seq: buffer containing the payload
+ */
+#define mipi_dsi_generic_write_seq(dsi, seq...) do {				\
+		static const u8 d[] = { seq };					\
+		struct device *dev = &dsi->dev;	\
+		int ret;						\
+		ret = mipi_dsi_generic_write(dsi, d, ARRAY_SIZE(d));	\
+		if (ret < 0) {						\
+			dev_err_ratelimited(dev, "transmit data failed: %d\n", ret); \
+			return ret;						\
+		}						\
+	} while (0)
+
 /**
  * mipi_dsi_dcs_write_seq - transmit a DCS command with payload
  * @dsi: DSI peripheral device
-- 
2.38.1