[PATCH v4] compositor-drm: Add the aspect ratio parsing support
Nautiyal Ankit
ankit.k.nautiyal at intel.com
Tue Nov 14 04:02:43 UTC 2017
From: Ankit Nautiyal <ankit.k.nautiyal at intel.com>
DRM layer populates aspect ratio information for CEA video modes,
but we lose it while parsing modeline (Aspect ratio patch series
in drm layer: https://patchwork.freedesktop.org/series/10850).
The flag bits 19-22 of the connector modes, provide the aspect ratio info.
This information can be stored in flags bits of the weston mode structure,
so that it can used for setting a mode with a particular aspect ratio.
This patch:
- preserves aspect ratio flags from kernel video modes and accommodates it
in wayland mode.
- Uses aspect ratio to pick the appropriate mode during modeset.
- changes the mode format in configuration file weston.ini to accommodate
aspect ratio information as:
WIDTHxHEIGHT at REFRESH-RATE ASPECT-RATIO
The aspect ratio should be given as <length:breadth>.
v2: As per recommendation from Pekka Paalanen, Quentin Glidic,
Daniel Stone, dropped the aspect-ratio info from wayland protocol,
thereby avoiding exposure of aspect-ratio to the client.
v3: As suggested by Pekka Paalanen, added aspect_ratio field to store
aspect-ratio information from the drm. Also added drm client capability
for aspect ratio, as recommended by Daniel Vetter.
v4: Added a general function to get aspect-ratio info from drmModeModeInfo
flags, as suggested by Pekka Paalanen. Took care of minor things suggested
in last review.
Signed-off-by: Ankit Nautiyal <ankit.k.nautiyal at intel.com>
---
libweston/compositor-drm.c | 91 +++++++++++++++++++++++++++++++++++++++++-----
libweston/compositor-drm.h | 23 ++++++++++++
libweston/compositor.h | 1 +
man/weston.ini.man | 11 ++++--
4 files changed, 112 insertions(+), 14 deletions(-)
diff --git a/libweston/compositor-drm.c b/libweston/compositor-drm.c
index b641d61..db1be5b 100644
--- a/libweston/compositor-drm.c
+++ b/libweston/compositor-drm.c
@@ -71,6 +71,10 @@
#define DRM_CLIENT_CAP_UNIVERSAL_PLANES 2
#endif
+#ifndef DRM_CLIENT_CAP_ASPECT_RATIO
+#define DRM_CLIENT_CAP_ASPECT_RATIO 4
+#endif
+
#ifndef DRM_CAP_CURSOR_WIDTH
#define DRM_CAP_CURSOR_WIDTH 0x8
#endif
@@ -184,6 +188,7 @@ struct drm_backend {
int32_t cursor_height;
uint32_t pageflip_timeout;
+ bool aspect_ratio_supported;
};
struct drm_mode {
@@ -1949,6 +1954,21 @@ drm_assign_planes(struct weston_output *output_base, void *repaint_data)
}
/**
+ * Get the aspect ratio from drmModeModeInfo mode flags.
+ *
+ * @param drm_mode_flags flags from drmModeModeInfo structure.
+ */
+static uint8_t
+drm_to_weston_mode_aspect_ratio(uint32_t drm_mode_flags)
+{
+ uint8_t aspect_ratio;
+
+ aspect_ratio = (drm_mode_flags & DRM_MODE_FLAG_PIC_AR_MASK) >>
+ DRM_MODE_FLAG_PIC_AR_BITS_POS;
+ return aspect_ratio;
+}
+
+/**
* Find the closest-matching mode for a given target
*
* Given a target mode, find the most suitable mode amongst the output's
@@ -1962,24 +1982,42 @@ drm_assign_planes(struct weston_output *output_base, void *repaint_data)
static struct drm_mode *
choose_mode (struct drm_output *output, struct weston_mode *target_mode)
{
- struct drm_mode *tmp_mode = NULL, *mode;
+ struct drm_mode *tmp_mode = NULL, *mode_fall_back = NULL, *mode;
+ uint8_t src_aspect = 0;
+ uint8_t target_aspect = 0;
+ struct drm_backend *b;
+ b = to_drm_backend(output->base.compositor);
+ target_aspect = target_mode->aspect_ratio;
+ src_aspect = output->base.current_mode->aspect_ratio;
if (output->base.current_mode->width == target_mode->width &&
output->base.current_mode->height == target_mode->height &&
(output->base.current_mode->refresh == target_mode->refresh ||
- target_mode->refresh == 0))
- return (struct drm_mode *)output->base.current_mode;
+ target_mode->refresh == 0)) {
+ if (!b->aspect_ratio_supported || src_aspect == target_aspect)
+ return (struct drm_mode *)output->base.current_mode;
+ }
wl_list_for_each(mode, &output->base.mode_list, base.link) {
+ uint32_t flags = mode->mode_info.flags;
+
+ src_aspect = drm_to_weston_mode_aspect_ratio(flags);
if (mode->mode_info.hdisplay == target_mode->width &&
mode->mode_info.vdisplay == target_mode->height) {
if (mode->base.refresh == target_mode->refresh ||
target_mode->refresh == 0) {
- return mode;
- } else if (!tmp_mode)
+ if (!b->aspect_ratio_supported ||
+ src_aspect == target_aspect)
+ return mode;
+ else if (!mode_fall_back)
+ mode_fall_back = mode;
+ } else if (!tmp_mode) {
tmp_mode = mode;
+ }
}
}
+ if (mode_fall_back)
+ return mode_fall_back;
return tmp_mode;
}
@@ -2112,6 +2150,11 @@ init_kms_caps(struct drm_backend *b)
weston_log("DRM: %s universal planes\n",
b->universal_planes ? "supports" : "does not support");
+ ret = drmSetClientCap(b->drm.fd, DRM_CLIENT_CAP_ASPECT_RATIO, 1);
+ b->aspect_ratio_supported = (ret == 0);
+ weston_log("DRM: %s picture aspect ratio\n",
+ b->aspect_ratio_supported ? "supports" : "does not support");
+
return 0;
}
@@ -2403,6 +2446,7 @@ drm_output_add_mode(struct drm_output *output, const drmModeModeInfo *info)
if (info->type & DRM_MODE_TYPE_PREFERRED)
mode->base.flags |= WL_OUTPUT_MODE_PREFERRED;
+ mode->base.aspect_ratio = drm_to_weston_mode_aspect_ratio(info->flags);
wl_list_insert(output->base.mode_list.prev, &mode->base.link);
return mode;
@@ -3010,17 +3054,37 @@ drm_output_choose_initial_mode(struct drm_backend *backend,
struct drm_mode *preferred = NULL;
struct drm_mode *current = NULL;
struct drm_mode *configured = NULL;
+ struct drm_mode *config_fall_back = NULL;
struct drm_mode *best = NULL;
struct drm_mode *drm_mode;
drmModeModeInfo drm_modeline;
int32_t width = 0;
int32_t height = 0;
uint32_t refresh = 0;
+ uint32_t aspect_width = 0;
+ uint32_t aspect_height = 0;
+ uint8_t aspect_ratio = WESTON_MODE_PIC_AR_NONE;
int n;
if (mode == WESTON_DRM_BACKEND_OUTPUT_PREFERRED && modeline) {
- n = sscanf(modeline, "%dx%d@%d", &width, &height, &refresh);
- if (n != 2 && n != 3) {
+ n = sscanf(modeline, "%dx%d@%d %u:%u", &width, &height,
+ &refresh, &aspect_width, &aspect_height);
+ if (backend->aspect_ratio_supported && n == 5) {
+ if (aspect_width == 4 && aspect_height == 3)
+ aspect_ratio = WESTON_MODE_PIC_AR_4_3;
+ else if (aspect_width == 16 && aspect_height == 9)
+ aspect_ratio = WESTON_MODE_PIC_AR_16_9;
+ else if (aspect_width == 64 && aspect_height == 27)
+ aspect_ratio = WESTON_MODE_PIC_AR_64_27;
+ else if (aspect_width == 256 && aspect_height == 135)
+ aspect_ratio = WESTON_MODE_PIC_AR_256_135;
+ else {
+
+ weston_log("Invalid modeline \"%s\" for output %s\n",
+ modeline, output->base.name);
+ }
+ }
+ if (n != 2 && n != 3 && n != 5) {
width = -1;
if (parse_modeline(modeline, &drm_modeline) == 0) {
@@ -3037,9 +3101,13 @@ drm_output_choose_initial_mode(struct drm_backend *backend,
wl_list_for_each_reverse(drm_mode, &output->base.mode_list, base.link) {
if (width == drm_mode->base.width &&
height == drm_mode->base.height &&
- (refresh == 0 || refresh == drm_mode->mode_info.vrefresh))
- configured = drm_mode;
-
+ (refresh == 0 || refresh == drm_mode->mode_info.vrefresh)) {
+ if (!backend->aspect_ratio_supported ||
+ aspect_ratio == drm_mode->base.aspect_ratio) {
+ configured = drm_mode;
+ } else
+ config_fall_back = drm_mode;
+ }
if (memcmp(current_mode, &drm_mode->mode_info,
sizeof *current_mode) == 0)
current = drm_mode;
@@ -3062,6 +3130,9 @@ drm_output_choose_initial_mode(struct drm_backend *backend,
if (configured)
return configured;
+ if (config_fall_back)
+ return config_fall_back;
+
if (preferred)
return preferred;
diff --git a/libweston/compositor-drm.h b/libweston/compositor-drm.h
index 8181492..e759f11 100644
--- a/libweston/compositor-drm.h
+++ b/libweston/compositor-drm.h
@@ -52,6 +52,29 @@ enum weston_drm_backend_output_mode {
WESTON_DRM_BACKEND_OUTPUT_PREFERRED,
};
+/**
+ * aspect ratio info taken from the drmModeModeInfo flag bits 19-22,
+ * which should be used to fill the aspect ratio field in weston_mode.
+ */
+#define DRM_MODE_FLAG_PIC_AR_BITS_POS 19
+#ifndef DRM_MODE_FLAG_PIC_AR_MASK
+#define DRM_MODE_FLAG_PIC_AR_MASK (0xF << DRM_MODE_FLAG_PIC_AR_BITS_POS)
+#endif
+enum weston_mode_aspect_ratio {
+ /** The picture aspect ratio values, for the aspect_ratio field of
+ * weston_mode. The values here, are taken from
+ * DRM_MODE_PICTURE_ASPECT_* from drm_mode.h.
+ */
+ WESTON_MODE_PIC_AR_NONE = 0, /* DRM_MODE_PICTURE_ASPECT_NONE */
+ WESTON_MODE_PIC_AR_4_3 = 1, /* DRM_MODE_PICTURE_ASPECT_4_3 */
+ WESTON_MODE_PIC_AR_16_9 = 2, /* DRM_MODE_PICTURE_ASPECT_16_9 */
+ WESTON_MODE_PIC_AR_64_27 = 3, /* DRM_MODE_PICTURE_ASPECT_64_27 */
+ WESTON_MODE_PIC_AR_256_135 = 4, /* DRM_MODE_PICTURE_ASPECT_256_135 */
+ /* Reserved for future */
+ WESTON_MODE_PIC_AR_RESERVED_1 = 5,
+ WESTON_MODE_PIC_AR_RESERVED_2 = 6,
+};
+
#define WESTON_DRM_OUTPUT_API_NAME "weston_drm_output_api_v1"
struct weston_drm_output_api {
diff --git a/libweston/compositor.h b/libweston/compositor.h
index 8b2d2b0..530b9dd 100644
--- a/libweston/compositor.h
+++ b/libweston/compositor.h
@@ -94,6 +94,7 @@ enum weston_led {
struct weston_mode {
uint32_t flags;
+ uint8_t aspect_ratio;
int32_t width, height;
uint32_t refresh;
struct wl_list link;
diff --git a/man/weston.ini.man b/man/weston.ini.man
index 4cfefc9..d1105ea 100644
--- a/man/weston.ini.man
+++ b/man/weston.ini.man
@@ -363,10 +363,13 @@ The DRM backend accepts different modes:
.PP
.RS 10
.nf
-.BR "WIDTHxHEIGHT " "Resolution size width and height in pixels"
-.BR "preferred " "Uses the preferred mode"
-.BR "current " "Uses the current crt controller mode"
-.BR "off " "Disables the output"
+.BR "WIDTHxHEIGHT " "Resolution size width and height in pixels"
+.BR "WIDTHxHEIGHT at RR " "Resolution as above and refresh-rate in Hertz"
+.BR "WIDTHxHEIGHT at RR RATIO " "Resolution as above and aspect-ratio as length:breadth e.g :"
+ 720x576 at 50 4:3, 1920x1080 at 60 16:9, 2560x1080 at 60 64:27, 4096x2160 at 60 256:156 etc.
+.BR "preferred " "Uses the preferred mode"
+.BR "current " "Uses the current crt controller mode"
+.BR "off " "Disables the output"
.fi
.RE
.RS
--
2.7.4
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