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drm/i915: Treat crtc->mode.clock == 0 as disabled

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Prevent a divide-by-zero by consistently treating an 'active' CRTC
without a mode set as actually disabled.

This looks to have been first introduced with

commit 2492935248
Author: Daniel Vetter <daniel.vetter@ffwll.ch>
Date:   Mon Jul 2 20:28:59 2012 +0200

    drm/i915: read out the modeset hw state at load and resume time

but then combined with

commit b0a2658acb
Author: Daniel Vetter <daniel.vetter@ffwll.ch>
Date:   Tue Dec 18 09:37:54 2012 +0100

    drm/i915: don't disable disconnected outputs

it finally started oopsing.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reported-and-tested-by: Alexey Zaytsev <alexey.zaytsev@gmail.com>
Tested-by: Sedat Dilek <sedat.dilek@gmail.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Jesse Barnes <jbarnes@virtuousgeek.org>
Cc: stable@vger.kernel.org
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Chris Wilson 2013-01-07 10:11:40 +00:00 committed by Daniel Vetter
parent 48e858340d
commit 3490ea5de6
1 changed files with 16 additions and 9 deletions
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25
drivers/gpu/drm/i915/intel_pm.c
View File

@ -44,6 +44,14 @@
* i915.i915_enable_fbc parameter
*/
static bool intel_crtc_active(struct drm_crtc *crtc)
{
/* Be paranoid as we can arrive here with only partial
* state retrieved from the hardware during setup.
*/
return to_intel_crtc(crtc)->active && crtc->fb && crtc->mode.clock;
}
static void i8xx_disable_fbc(struct drm_device *dev)
{
struct drm_i915_private *dev_priv = dev->dev_private;
@ -405,9 +413,8 @@ void intel_update_fbc(struct drm_device *dev)
* - going to an unsupported config (interlace, pixel multiply, etc.)
*/
list_for_each_entry(tmp_crtc, &dev->mode_config.crtc_list, head) {
if (to_intel_crtc(tmp_crtc)->active &&
!to_intel_crtc(tmp_crtc)->primary_disabled &&
tmp_crtc->fb) {
if (intel_crtc_active(tmp_crtc) &&
!to_intel_crtc(tmp_crtc)->primary_disabled) {
if (crtc) {
DRM_DEBUG_KMS("more than one pipe active, disabling compression\n");
dev_priv->no_fbc_reason = FBC_MULTIPLE_PIPES;
@ -992,7 +999,7 @@ static struct drm_crtc *single_enabled_crtc(struct drm_device *dev)
struct drm_crtc *crtc, *enabled = NULL;
list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
if (to_intel_crtc(crtc)->active && crtc->fb) {
if (intel_crtc_active(crtc)) {
if (enabled)
return NULL;
enabled = crtc;
@ -1086,7 +1093,7 @@ static bool g4x_compute_wm0(struct drm_device *dev,
int entries, tlb_miss;
crtc = intel_get_crtc_for_plane(dev, plane);
if (crtc->fb == NULL || !to_intel_crtc(crtc)->active) {
if (!intel_crtc_active(crtc)) {
*cursor_wm = cursor->guard_size;
*plane_wm = display->guard_size;
return false;
@ -1215,7 +1222,7 @@ static bool vlv_compute_drain_latency(struct drm_device *dev,
int entries;
crtc = intel_get_crtc_for_plane(dev, plane);
if (crtc->fb == NULL || !to_intel_crtc(crtc)->active)
if (!intel_crtc_active(crtc))
return false;
clock = crtc->mode.clock; /* VESA DOT Clock */
@ -1476,7 +1483,7 @@ static void i9xx_update_wm(struct drm_device *dev)
fifo_size = dev_priv->display.get_fifo_size(dev, 0);
crtc = intel_get_crtc_for_plane(dev, 0);
if (to_intel_crtc(crtc)->active && crtc->fb) {
if (intel_crtc_active(crtc)) {
int cpp = crtc->fb->bits_per_pixel / 8;
if (IS_GEN2(dev))
cpp = 4;
@ -1490,7 +1497,7 @@ static void i9xx_update_wm(struct drm_device *dev)
fifo_size = dev_priv->display.get_fifo_size(dev, 1);
crtc = intel_get_crtc_for_plane(dev, 1);
if (to_intel_crtc(crtc)->active && crtc->fb) {
if (intel_crtc_active(crtc)) {
int cpp = crtc->fb->bits_per_pixel / 8;
if (IS_GEN2(dev))
cpp = 4;
@ -2044,7 +2051,7 @@ sandybridge_compute_sprite_wm(struct drm_device *dev, int plane,
int entries, tlb_miss;
crtc = intel_get_crtc_for_plane(dev, plane);
if (crtc->fb == NULL || !to_intel_crtc(crtc)->active) {
if (!intel_crtc_active(crtc)) {
*sprite_wm = display->guard_size;
return false;
}