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Message-Id: <20241019200530.270738-1-aradhya.bhatia@linux.dev>
Date: Sun, 20 Oct 2024 01:35:25 +0530
From: Aradhya Bhatia <aradhya.bhatia@...ux.dev>
To: Tomi Valkeinen <tomi.valkeinen@...asonboard.com>,
Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
Laurent Pinchart <laurent.pinchart@...asonboard.com>,
Andrzej Hajda <andrzej.hajda@...el.com>,
Neil Armstrong <neil.armstrong@...aro.org>,
Robert Foss <rfoss@...nel.org>,
Jonas Karlman <jonas@...boo.se>,
Jernej Skrabec <jernej.skrabec@...il.com>,
Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
Maxime Ripard <mripard@...nel.org>,
Thomas Zimmermann <tzimmermann@...e.de>,
David Airlie <airlied@...il.com>,
Simona Vetter <simona@...ll.ch>
Cc: Dominik Haller <d.haller@...tec.de>,
Sam Ravnborg <sam@...nborg.org>,
Kieran Bingham <kieran.bingham+renesas@...asonboard.com>,
Nishanth Menon <nm@...com>,
Vignesh Raghavendra <vigneshr@...com>,
Devarsh Thakkar <devarsht@...com>,
Praneeth Bajjuri <praneeth@...com>,
Udit Kumar <u-kumar1@...com>,
Jayesh Choudhary <j-choudhary@...com>,
DRI Development List <dri-devel@...ts.freedesktop.org>,
Linux Kernel List <linux-kernel@...r.kernel.org>,
Aradhya Bhatia <aradhya.bhatia@...ux.dev>
Subject: [PATCH v5 08/13] drm/mipi-dsi: Add helper to find input format
From: Aradhya Bhatia <a-bhatia1@...com>
Add a helper API that can be used by the DSI hosts to find the required
input bus format for the given output dsi pixel format.
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Reviewed-by: Tomi Valkeinen <tomi.valkeinen@...asonboard.com>
Signed-off-by: Aradhya Bhatia <a-bhatia1@...com>
Signed-off-by: Aradhya Bhatia <aradhya.bhatia@...ux.dev>
---
drivers/gpu/drm/drm_mipi_dsi.c | 37 ++++++++++++++++++++++++++++++++++
include/drm/drm_mipi_dsi.h | 1 +
2 files changed, 38 insertions(+)
diff --git a/drivers/gpu/drm/drm_mipi_dsi.c b/drivers/gpu/drm/drm_mipi_dsi.c
index 5e5c5f84daac..076826f2445a 100644
--- a/drivers/gpu/drm/drm_mipi_dsi.c
+++ b/drivers/gpu/drm/drm_mipi_dsi.c
@@ -36,6 +36,8 @@
#include <drm/drm_mipi_dsi.h>
#include <drm/drm_print.h>
+#include <linux/media-bus-format.h>
+
#include <video/mipi_display.h>
/**
@@ -870,6 +872,41 @@ ssize_t mipi_dsi_generic_read(struct mipi_dsi_device *dsi, const void *params,
}
EXPORT_SYMBOL(mipi_dsi_generic_read);
+/**
+ * drm_mipi_dsi_get_input_bus_fmt() - Get the required MEDIA_BUS_FMT_* based
+ * input pixel format for a given DSI output
+ * pixel format
+ * @dsi_format: pixel format that a DSI host needs to output
+ *
+ * Various DSI hosts can use this function during their
+ * &drm_bridge_funcs.atomic_get_input_bus_fmts operation to ascertain
+ * the MEDIA_BUS_FMT_* pixel format required as input.
+ *
+ * RETURNS:
+ * a 32-bit MEDIA_BUS_FMT_* value on success or 0 in case of failure.
+ */
+u32 drm_mipi_dsi_get_input_bus_fmt(enum mipi_dsi_pixel_format dsi_format)
+{
+ switch (dsi_format) {
+ case MIPI_DSI_FMT_RGB888:
+ return MEDIA_BUS_FMT_RGB888_1X24;
+
+ case MIPI_DSI_FMT_RGB666:
+ return MEDIA_BUS_FMT_RGB666_1X24_CPADHI;
+
+ case MIPI_DSI_FMT_RGB666_PACKED:
+ return MEDIA_BUS_FMT_RGB666_1X18;
+
+ case MIPI_DSI_FMT_RGB565:
+ return MEDIA_BUS_FMT_RGB565_1X16;
+
+ default:
+ /* Unsupported DSI Format */
+ return 0;
+ }
+}
+EXPORT_SYMBOL(drm_mipi_dsi_get_input_bus_fmt);
+
/**
* mipi_dsi_dcs_write_buffer() - transmit a DCS command with payload
* @dsi: DSI peripheral device
diff --git a/include/drm/drm_mipi_dsi.h b/include/drm/drm_mipi_dsi.h
index 94400a78031f..9e2804e3a2b0 100644
--- a/include/drm/drm_mipi_dsi.h
+++ b/include/drm/drm_mipi_dsi.h
@@ -293,6 +293,7 @@ void mipi_dsi_generic_write_multi(struct mipi_dsi_multi_context *ctx,
const void *payload, size_t size);
ssize_t mipi_dsi_generic_read(struct mipi_dsi_device *dsi, const void *params,
size_t num_params, void *data, size_t size);
+u32 drm_mipi_dsi_get_input_bus_fmt(enum mipi_dsi_pixel_format dsi_format);
#define mipi_dsi_msleep(ctx, delay) \
do { \
--
2.34.1
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