swc

commit 0c3f36c5ac561cd2adcc9fc09fc8ad0abe6f371a
parent f5f7b0704c1f8f93c03bd09d449296f318817a3e
Author: Nihal Jere <nihal@nihaljere.xyz>
Date:   Thu, 13 May 2021 12:27:03 -0500

drm: primary card needs universal planes support

Diffstat:
M
libswc/drm.c
 | 
23
+++++++++++++++++++++--

1 file changed, 21 insertions(+), 2 deletions(-)
diff --git a/libswc/drm.c b/libswc/drm.c
@@ -129,7 +129,7 @@ static bool
 find_primary_drm_device(char *path, size_t size)
 {
 	struct dirent **cards, *card = NULL;
-	int num_cards, ret;
+	int num_cards, ret, fd;
 	unsigned index;
 	FILE *file;
 	unsigned char boot_vga;
@@ -154,6 +154,24 @@ find_primary_drm_device(char *path, size_t size)
 			}
 		}
 
+		if (snprintf(path, size, "/dev/dri/%s", cards[index]->d_name) >= size)
+			return false;
+
+		fd = open(path, O_RDWR | O_CLOEXEC);
+		if (fd == -1)
+			continue;
+
+		/* If the card doesn't support universal planes, we can't use it.
+		 * On many ARM devices, the device that performs hardware accelerated
+		 * rendering is different from the device composites framebuffers.
+		 * The one that composites framebuffers should have universal planes
+		 * support (if I understand correctly) */
+		if (drmSetClientCap(fd, DRM_CLIENT_CAP_UNIVERSAL_PLANES, 1) < 0) {
+			close(fd);
+			continue;
+		}
+		close(fd);
+
 		if (!card)
 			card = cards[index];
 		else
@@ -277,9 +295,10 @@ drm_initialize(void)
 {
 	uint64_t val;
 	char primary[PATH_MAX];
+	char render[PATH_MAX];
 
 	if (!find_primary_drm_device(primary, sizeof(primary))) {
-		ERROR("Could not find DRM device\n");
+		ERROR("Could not find valid DRM device\n");
 		goto error0;
 	}