linux-kernel - [PATCH v4 3/4] drm/mipi-dsi: Introduce mipi_dsi_dcs_write

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Message-ID: <BY5PR02MB700952493EEB6F0E77DC8416D9DF9@BY5PR02MB7009.namprd02.prod.outlook.com>
Date:   Wed,  1 Jun 2022 13:54:09 +0530
From:   Joel Selvaraj <jo@...amily.in>
To:     Thierry Reding <thierry.reding@...il.com>,
        Sam Ravnborg <sam@...nborg.org>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Rob Herring <robh+dt@...nel.org>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Stanislav Jakubek <stano.jakubek@...il.com>,
        Shawn Guo <shawnguo@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Corentin Labbe <clabbe@...libre.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Hao Fang <fanghao11@...wei.com>
Cc:     dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        ~postmarketos/upstreaming@...ts.sr.ht, phone-devel@...r.kernel.org,
        Joel Selvaraj <jo@...amily.in>
Subject: [PATCH v4 3/4] 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@...amily.in>
---
Changes in v4: (Linus Walleij's Suggestion)
 - Introduce mipi_dsi_dcs_write_seq macro in include/drm/drm_mipi_dsi.h

 include/drm/drm_mipi_dsi.h | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/include/drm/drm_mipi_dsi.h b/include/drm/drm_mipi_dsi.h
index 147e51b6d241..4a5996901689 100644
--- a/include/drm/drm_mipi_dsi.h
+++ b/include/drm/drm_mipi_dsi.h
@@ -293,6 +293,23 @@ 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_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
-- 
2.36.1