From fa02b05645080c285da5972262a8d37403e39d7e Mon Sep 17 00:00:00 2001
From: Dave Airlie <airlied@redhat.com>
Date: Tue, 3 May 2016 06:54:57 +1000
Subject: [PATCH] modesetting: port clean start code from amdgpu. (v2)

Both radeon and amdgpu don't set the mode until the first blockhandler,
this means everything should be rendered on the screen correctly by
then.

This ports this code, it also removes the tail call of EnterVT from
ScreenInit, it really isn't necessary and causes us to set a dirty mode
with -modesetting always anyways.

v2: reorder set desired modes vs block handler as done for amdgpu.

Reviewed-by: Eric Anholt <eric@anholt.net>
Signed-off-by: Dave Airlie <airlied@redhat.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
---
 hw/xfree86/drivers/modesetting/driver.c       | 21 +++++++++++++---
 .../drivers/modesetting/drmmode_display.c     | 25 +++++++++++++------
 .../drivers/modesetting/drmmode_display.h     |  2 +-
 3 files changed, 36 insertions(+), 12 deletions(-)

diff --git a/hw/xfree86/drivers/modesetting/driver.c b/hw/xfree86/drivers/modesetting/driver.c
index 6c4bac3fa..fe5d5e179 100644
--- a/hw/xfree86/drivers/modesetting/driver.c
+++ b/hw/xfree86/drivers/modesetting/driver.c
@@ -613,6 +613,17 @@ msBlockHandler(ScreenPtr pScreen, void *pTimeout, void *pReadmask)
     ms_dirty_update(pScreen);
 }
 
+static void
+msBlockHandler_oneshot(ScreenPtr pScreen, void *pTimeout, void *pReadmask)
+{
+    ScrnInfoPtr pScrn = xf86ScreenToScrn(pScreen);
+    modesettingPtr ms = modesettingPTR(pScrn);
+
+    msBlockHandler(pScreen, pTimeout, pReadmask);
+
+    drmmode_set_desired_modes(pScrn, &ms->drmmode, TRUE);
+}
+
 static void
 FreeRec(ScrnInfoPtr pScrn)
 {
@@ -972,7 +983,7 @@ CreateScreenResources(ScreenPtr pScreen)
     ret = pScreen->CreateScreenResources(pScreen);
     pScreen->CreateScreenResources = CreateScreenResources;
 
-    if (!drmmode_set_desired_modes(pScrn, &ms->drmmode))
+    if (!drmmode_set_desired_modes(pScrn, &ms->drmmode, pScrn->is_gpu))
         return FALSE;
 
     if (!drmmode_glamor_handle_new_screen_pixmap(&ms->drmmode))
@@ -1235,7 +1246,7 @@ ScreenInit(ScreenPtr pScreen, int argc, char **argv)
     pScreen->CloseScreen = CloseScreen;
 
     ms->BlockHandler = pScreen->BlockHandler;
-    pScreen->BlockHandler = msBlockHandler;
+    pScreen->BlockHandler = msBlockHandler_oneshot;
 
     pScreen->SharePixmapBacking = msSharePixmapBacking;
     pScreen->SetSharedPixmapBacking = msSetSharedPixmapBacking;
@@ -1289,7 +1300,9 @@ ScreenInit(ScreenPtr pScreen, int argc, char **argv)
     }
 #endif
 
-    return EnterVT(pScrn);
+    pScrn->vtSema = TRUE;
+
+    return TRUE;
 }
 
 static void
@@ -1336,7 +1349,7 @@ EnterVT(ScrnInfoPtr pScrn)
 
     SetMaster(pScrn);
 
-    if (!drmmode_set_desired_modes(pScrn, &ms->drmmode))
+    if (!drmmode_set_desired_modes(pScrn, &ms->drmmode, TRUE))
         return FALSE;
 
     return TRUE;
diff --git a/hw/xfree86/drivers/modesetting/drmmode_display.c b/hw/xfree86/drivers/modesetting/drmmode_display.c
index e0d624f60..546673b19 100644
--- a/hw/xfree86/drivers/modesetting/drmmode_display.c
+++ b/hw/xfree86/drivers/modesetting/drmmode_display.c
@@ -1853,7 +1853,7 @@ drmmode_adjust_frame(ScrnInfoPtr pScrn, drmmode_ptr drmmode, int x, int y)
 }
 
 Bool
-drmmode_set_desired_modes(ScrnInfoPtr pScrn, drmmode_ptr drmmode)
+drmmode_set_desired_modes(ScrnInfoPtr pScrn, drmmode_ptr drmmode, Bool set_hw)
 {
     xf86CrtcConfigPtr config = XF86_CRTC_CONFIG_PTR(pScrn);
     int c;
@@ -1866,8 +1866,10 @@ drmmode_set_desired_modes(ScrnInfoPtr pScrn, drmmode_ptr drmmode)
 
         /* Skip disabled CRTCs */
         if (!crtc->enabled) {
-            drmModeSetCrtc(drmmode->fd, drmmode_crtc->mode_crtc->crtc_id,
-                           0, 0, 0, NULL, 0, NULL);
+            if (set_hw) {
+                drmModeSetCrtc(drmmode->fd, drmmode_crtc->mode_crtc->crtc_id,
+                               0, 0, 0, NULL, 0, NULL);
+            }
             continue;
         }
 
@@ -1898,10 +1900,19 @@ drmmode_set_desired_modes(ScrnInfoPtr pScrn, drmmode_ptr drmmode)
             crtc->desiredY = 0;
         }
 
-        if (!crtc->funcs->
-            set_mode_major(crtc, &crtc->desiredMode, crtc->desiredRotation,
-                           crtc->desiredX, crtc->desiredY))
-            return FALSE;
+        if (set_hw) {
+            if (!crtc->funcs->
+                set_mode_major(crtc, &crtc->desiredMode, crtc->desiredRotation,
+                               crtc->desiredX, crtc->desiredY))
+                return FALSE;
+        } else {
+            crtc->mode = crtc->desiredMode;
+            crtc->rotation = crtc->desiredRotation;
+            crtc->x = crtc->desiredX;
+            crtc->y = crtc->desiredY;
+            if (!xf86CrtcRotate(crtc))
+                return FALSE;
+        }
     }
     return TRUE;
 }
diff --git a/hw/xfree86/drivers/modesetting/drmmode_display.h b/hw/xfree86/drivers/modesetting/drmmode_display.h
index a648d89c5..6b94641a4 100644
--- a/hw/xfree86/drivers/modesetting/drmmode_display.h
+++ b/hw/xfree86/drivers/modesetting/drmmode_display.h
@@ -163,7 +163,7 @@ Bool drmmode_SetSlaveBO(PixmapPtr ppix,
 
 extern Bool drmmode_pre_init(ScrnInfoPtr pScrn, drmmode_ptr drmmode, int cpp);
 void drmmode_adjust_frame(ScrnInfoPtr pScrn, drmmode_ptr drmmode, int x, int y);
-extern Bool drmmode_set_desired_modes(ScrnInfoPtr pScrn, drmmode_ptr drmmode);
+extern Bool drmmode_set_desired_modes(ScrnInfoPtr pScrn, drmmode_ptr drmmode, Bool set_hw);
 extern Bool drmmode_setup_colormap(ScreenPtr pScreen, ScrnInfoPtr pScrn);
 
 extern void drmmode_uevent_init(ScrnInfoPtr scrn, drmmode_ptr drmmode);