[PATCH xserver 1/2] modesetting: Ignore alpha channel when importing BOs for modesetting

[Louis-Francis Ratté-Boulianne]

Fixes a regression caused by modifiers support. For some hw to
continue working even if not supporting ARGB8888 and ARGB2101010
formats, we assume that all imported BOs are opaque.

Signed-off-by: Louis-Francis Ratté-Boulianne <lfrb at collabora.com>
---
 hw/xfree86/drivers/modesetting/drmmode_display.c | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/hw/xfree86/drivers/modesetting/drmmode_display.c b/hw/xfree86/drivers/modesetting/drmmode_display.c
index 47c11adce..e010eae21 100644
--- a/hw/xfree86/drivers/modesetting/drmmode_display.c
+++ b/hw/xfree86/drivers/modesetting/drmmode_display.c
@@ -70,12 +70,28 @@ modifiers_ptr(struct drm_format_modifier_blob *blob)
     return (struct drm_format_modifier *)(((char *)blob) + blob->modifiers_offset);
 }
 
+static uint32_t
+get_opaque_format(uint32_t format)
+{
+    switch (format) {
+    case DRM_FORMAT_ARGB8888:
+        return DRM_FORMAT_XRGB8888;
+    case DRM_FORMAT_ARGB2101010:
+        return DRM_FORMAT_XRGB2101010;
+    default:
+        return format;
+    }
+}
+
 Bool
 drmmode_is_format_supported(ScrnInfoPtr scrn, uint32_t format, uint64_t modifier)
 {
     xf86CrtcConfigPtr xf86_config = XF86_CRTC_CONFIG_PTR(scrn);
     int c, i, j;
 
+    /* BO are imported as opaque surface, so let's pretend there is no alpha */
+    format = get_opaque_format(format);
+
     for (c = 0; c < xf86_config->num_crtc; c++) {
         xf86CrtcPtr crtc = xf86_config->crtc[c];
         drmmode_crtc_private_ptr drmmode_crtc = crtc->driver_private;
@@ -123,6 +139,9 @@ get_modifiers_set(ScrnInfoPtr scrn, uint32_t format, uint64_t **modifiers,
     int c, i, j, k, count_modifiers = 0;
     uint64_t *tmp, *ret = NULL;
 
+    /* BOs are imported as opaque surfaces, so pretend the same thing here */
+    format = get_opaque_format(format);
+
     *modifiers = NULL;
     for (c = 0; c < xf86_config->num_crtc; c++) {
         xf86CrtcPtr crtc = xf86_config->crtc[c];
@@ -684,6 +703,7 @@ drmmode_bo_import(drmmode_ptr drmmode, drmmode_bo *bo,
             memset(modifiers, 0, sizeof(modifiers));
 
             format = gbm_bo_get_format(bo->gbm);
+            format = get_opaque_format(format);
             for (i = 0; i < num_fds; i++) {
                 handles[i] = gbm_bo_get_handle_for_plane(bo->gbm, i).u32;
                 strides[i] = gbm_bo_get_stride_for_plane(bo->gbm, i);
-- 
2.14.3