[PATCH 07/29] gma500: Do sane FB cleanup

From: Alan Cox
Date: Tue Jun 28 2011 - 18:05:14 EST


From: Alan Cox <alan@xxxxxxxxxxxxxxx>

If we get a user frame buffer destroyed which is being displayed then clean
up the mess nicely. We can now run a slightly modified modetest including setting
modes, and handling crashes.

Modetest still blows up but this is because libdrm 2.4.25 is busted.


Signed-off-by: Alan Cox <alan@xxxxxxxxxxxxxxx>
---

drivers/staging/gma500/psb_fb.c | 24 +++++++++++++++++++++++-
drivers/staging/gma500/psb_intel_display.c | 22 +++++++++++++---------
2 files changed, 36 insertions(+), 10 deletions(-)


diff --git a/drivers/staging/gma500/psb_fb.c b/drivers/staging/gma500/psb_fb.c
index 5977add..d005025 100644
--- a/drivers/staging/gma500/psb_fb.c
+++ b/drivers/staging/gma500/psb_fb.c
@@ -719,16 +719,38 @@ static void psb_user_framebuffer_destroy(struct drm_framebuffer *fb)
{
struct psb_framebuffer *psbfb = to_psb_fb(fb);
struct gtt_range *r = psbfb->gtt;
+ struct drm_device *dev = fb->dev;
+ struct drm_psb_private *dev_priv = dev->dev_private;
+ struct psb_fbdev *fbdev = dev_priv->fbdev;
+ struct drm_crtc *crtc;
+ int reset = 0;

/* Should never get stolen memory for a user fb */
WARN_ON(r->stolen);
pr_err("user framebuffer destroy %p, fbdev %p\n",
psbfb, psbfb->fbdev);
+ /* Check if we are erroneously live */
+ list_for_each_entry(crtc, &dev->mode_config.crtc_list, head)
+ if (crtc->fb == fb)
+ reset = 1;
+
+ if (reset)
+ pr_err("DRM: gma500, forcing reset\n");
+
+ if (reset)
+ /*
+ * Now force a sane response before we permit the DRM crc layer to
+ * do stupid things like blank the display. Instead we reset this
+ * framebuffer as if the user had forced a reset. We must do this
+ * before the cleanup so that the DRM layer doesn't get a chance
+ * to stick its oar in where it isn't wanted.
+ */
+ drm_fb_helper_restore_fbdev_mode(&fbdev->psb_fb_helper);
+
/* Let DRM do its clean up */
drm_framebuffer_cleanup(fb);
/* We are no longer using the resource in GEM */
drm_gem_object_unreference_unlocked(&r->gem);
-
kfree(fb);
}

diff --git a/drivers/staging/gma500/psb_intel_display.c b/drivers/staging/gma500/psb_intel_display.c
index a99271d..c7c55b1 100644
--- a/drivers/staging/gma500/psb_intel_display.c
+++ b/drivers/staging/gma500/psb_intel_display.c
@@ -352,15 +352,15 @@ int psb_intel_pipe_set_base(struct drm_crtc *crtc,

PSB_DEBUG_ENTRY("\n");

+ if (!gma_power_begin(dev, true))
+ return 0;
+
/* no fb bound */
if (!crtc->fb) {
DRM_DEBUG("No FB bound\n");
- return 0;
+ goto psb_intel_pipe_cleaner;
}

- if (!gma_power_begin(dev, true))
- return 0;
-
/* We are displaying this buffer, make sure it is actually loaded
into the GTT */
ret = psb_gtt_pin(psbfb->gtt);
@@ -409,6 +409,7 @@ int psb_intel_pipe_set_base(struct drm_crtc *crtc,
REG_READ(dspbase);
}

+psb_intel_pipe_cleaner:
/* If there was a previous display we can now unpin it */
if (old_fb)
psb_gtt_unpin(to_psb_fb(old_fb)->gtt);
@@ -588,6 +589,7 @@ static int psb_intel_crtc_mode_set(struct drm_crtc *crtc,
{
struct drm_device *dev = crtc->dev;
struct psb_intel_crtc *psb_intel_crtc = to_psb_intel_crtc(crtc);
+ struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
int pipe = psb_intel_crtc->pipe;
int fp_reg = (pipe == 0) ? FPA0 : FPB0;
int dpll_reg = (pipe == 0) ? DPLL_A : DPLL_B;
@@ -610,6 +612,12 @@ static int psb_intel_crtc_mode_set(struct drm_crtc *crtc,
struct drm_mode_config *mode_config = &dev->mode_config;
struct drm_connector *connector;

+ /* No scan out no play */
+ if (crtc->fb == NULL) {
+ crtc_funcs->mode_set_base(crtc, x, y, old_fb);
+ return 0;
+ }
+
list_for_each_entry(connector, &mode_config->connector_list, head) {
struct psb_intel_output *psb_intel_output =
to_psb_intel_output(connector);
@@ -786,11 +794,7 @@ static int psb_intel_crtc_mode_set(struct drm_crtc *crtc,
REG_WRITE(dspcntr_reg, dspcntr);

/* Flush the plane changes */
- {
- struct drm_crtc_helper_funcs *crtc_funcs =
- crtc->helper_private;
- crtc_funcs->mode_set_base(crtc, x, y, old_fb);
- }
+ crtc_funcs->mode_set_base(crtc, x, y, old_fb);

psb_intel_wait_for_vblank(dev);


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