modesetting: Disable reverse prime offload mode for displays running on evdi,udl

This mode for displays running on evdi/udl as side effect of failed glamor_egl_init
reverse_prime_offload_mode was initialized to FALSE

After Mesa upgrade to 21.0.0 GL_RENDERER is not llvmpipe that results in successful glamor_egl_init
and reverse_prime_offload_mode enabled.

This commit is explicitly disabling reverse_prime_offload_mode for evdi and udl drivers

Signed-off-by: Łukasz Spintzyk <lukasz.spintzyk@synaptics.com>
(cherry picked from commit 7e7c147105ac704a7b33bdee0f85dc9ccdd8f747)

1 files changed, 14 insertions, 2 deletions

diff --git a/hw/xfree86/drivers/modesetting/driver.c b/hw/xfree86/drivers/modesetting/driver.c
index ef4a3147d..8ca3e897a 100644
--- a/hw/xfree86/drivers/modesetting/driver.c
+++ b/hw/xfree86/drivers/modesetting/driver.c
@@ -1752,18 +1752,30 @@ ScreenInit(ScreenPtr pScreen, int argc, char **argv)
                        "Failed to initialize the Present extension.\n");
         }
         /* enable reverse prime if we are a GPU screen, and accelerated, and not
-         * i915. i915 is happy scanning out from sysmem. */
+         * i915, evdi or udl. i915 is happy scanning out from sysmem.
+         * evdi and udl are virtual drivers scanning out from sysmem
+         * backed dumb buffers.
+         */
         if (pScreen->isGPU) {
             drmVersionPtr version;
 
             /* enable if we are an accelerated GPU screen */
             ms->drmmode.reverse_prime_offload_mode = TRUE;
 
-            /* disable if we detect i915 */
             if ((version = drmGetVersion(ms->drmmode.fd))) {
                 if (!strncmp("i915", version->name, version->name_len)) {
                     ms->drmmode.reverse_prime_offload_mode = FALSE;
                 }
+                if (!strncmp("evdi", version->name, version->name_len)) {
+                    ms->drmmode.reverse_prime_offload_mode = FALSE;
+                }
+                if (!strncmp("udl", version->name, version->name_len)) {
+                    ms->drmmode.reverse_prime_offload_mode = FALSE;
+                }
+                if (!ms->drmmode.reverse_prime_offload_mode) {
+                    xf86DrvMsg(pScrn->scrnIndex, X_INFO,
+                       "Disable reverse prime offload mode for %s.\n", version->name);
+                }
                 drmFreeVersion(version);
             }
         }