linux-kernel - [PATCH RFC v4 10/21] drm/dsi: Add a helper to get bits per pixel of MIPI DSI pixel format

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Message-ID: <1419328939-22758-11-git-send-email-Ying.Liu@freescale.com>
Date:	Tue, 23 Dec 2014 18:02:08 +0800
From:	Liu Ying <Ying.Liu@...escale.com>
To:	<dri-devel@...ts.freedesktop.org>
CC:	<devicetree@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>, <linux@....linux.org.uk>,
	<kernel@...gutronix.de>, <p.zabel@...gutronix.de>,
	<thierry.reding@...il.com>, <shawn.guo@...aro.org>,
	<mturquette@...aro.org>, <airlied@...ux.ie>, <andyshrk@...il.com>,
	<stefan.wahren@...e.com>, <linux-kernel@...r.kernel.org>
Subject: [PATCH RFC v4 10/21] drm/dsi: Add a helper to get bits per pixel of MIPI DSI pixel format

Signed-off-by: Liu Ying <Ying.Liu@...escale.com>
---
v3->v4:
 * None.

v2->v3:
 * None.

v1->v2:
 * Thierry Reding suggested that the mipi_dsi_pixel_format_to_bpp() function
   could be placed at the common DRM MIPI DSI driver.
   This patch is newly added.

 include/drm/drm_mipi_dsi.h | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/include/drm/drm_mipi_dsi.h b/include/drm/drm_mipi_dsi.h
index f1d8d0d..0f5210c 100644
--- a/include/drm/drm_mipi_dsi.h
+++ b/include/drm/drm_mipi_dsi.h
@@ -163,6 +163,20 @@ static inline struct mipi_dsi_device *to_mipi_dsi_device(struct device *dev)
 	return container_of(dev, struct mipi_dsi_device, dev);
 }
 
+static inline int mipi_dsi_pixel_format_to_bpp(enum mipi_dsi_pixel_format format)
+{
+	switch (format) {
+	case MIPI_DSI_FMT_RGB888:
+	case MIPI_DSI_FMT_RGB666:
+		return 24;
+	case MIPI_DSI_FMT_RGB666_PACKED:
+		return 18;
+	case MIPI_DSI_FMT_RGB565:
+		return 16;
+	}
+	return -EINVAL;
+}
+
 struct mipi_dsi_device *of_find_mipi_dsi_device_by_node(struct device_node *np);
 int mipi_dsi_attach(struct mipi_dsi_device *dsi);
 int mipi_dsi_detach(struct mipi_dsi_device *dsi);
-- 
2.1.0

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