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drm/radeon/pm: don't walk the crtc list before it has been initialized (v2)

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Avoids a crash in certain cases when thermal irqs are generated
before the display structures have been initialized.

v2: fix the vblank and vrefresh helpers as well

bug:
https://bugzilla.kernel.org/show_bug.cgi?id=73931

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
This commit is contained in:
Alex Deucher
2014-04-15 12:44:33 -04:00
committed by Christian König
parent cb3e4e7c59
commit 3ed9a335cf
2 changed files with 35 additions and 28 deletions
Download Patch File Download Diff File Expand all files Collapse all files

35
drivers/gpu/drm/radeon/r600_dpm.c
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@@ -158,16 +158,18 @@ u32 r600_dpm_get_vblank_time(struct radeon_device *rdev)
u32 line_time_us, vblank_lines;
u32 vblank_time_us = 0xffffffff; /* if the displays are off, vblank time is max */
list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
radeon_crtc = to_radeon_crtc(crtc);
if (crtc->enabled && radeon_crtc->enabled && radeon_crtc->hw_mode.clock) {
line_time_us = (radeon_crtc->hw_mode.crtc_htotal * 1000) /
radeon_crtc->hw_mode.clock;
vblank_lines = radeon_crtc->hw_mode.crtc_vblank_end -
radeon_crtc->hw_mode.crtc_vdisplay +
(radeon_crtc->v_border * 2);
vblank_time_us = vblank_lines * line_time_us;
break;
if (rdev->num_crtc && rdev->mode_info.mode_config_initialized) {
list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
radeon_crtc = to_radeon_crtc(crtc);
if (crtc->enabled && radeon_crtc->enabled && radeon_crtc->hw_mode.clock) {
line_time_us = (radeon_crtc->hw_mode.crtc_htotal * 1000) /
radeon_crtc->hw_mode.clock;
vblank_lines = radeon_crtc->hw_mode.crtc_vblank_end -
radeon_crtc->hw_mode.crtc_vdisplay +
(radeon_crtc->v_border * 2);
vblank_time_us = vblank_lines * line_time_us;
break;
}
}
}
@@ -181,14 +183,15 @@ u32 r600_dpm_get_vrefresh(struct radeon_device *rdev)
struct radeon_crtc *radeon_crtc;
u32 vrefresh = 0;
list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
radeon_crtc = to_radeon_crtc(crtc);
if (crtc->enabled && radeon_crtc->enabled && radeon_crtc->hw_mode.clock) {
vrefresh = radeon_crtc->hw_mode.vrefresh;
break;
if (rdev->num_crtc && rdev->mode_info.mode_config_initialized) {
list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
radeon_crtc = to_radeon_crtc(crtc);
if (crtc->enabled && radeon_crtc->enabled && radeon_crtc->hw_mode.clock) {
vrefresh = radeon_crtc->hw_mode.vrefresh;
break;
}
}
}
return vrefresh;
}