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Subject[PATCH 3.19 023/101] drm/radeon/dpm: fix 120hz handling harder
Date
3.19-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Alex Deucher <alexander.deucher@amd.com>

commit 3899ca844b82fb201fb764f56eec483acb59a29c upstream.

Need to expand the check to handle short circuiting
if the selected state is the same as current state.

bug:
https://bugs.freedesktop.org/show_bug.cgi?id=87796

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
drivers/gpu/drm/radeon/radeon.h | 1 +
drivers/gpu/drm/radeon/radeon_pm.c | 22 +++++++++++++++++-----
2 files changed, 18 insertions(+), 5 deletions(-)

--- a/drivers/gpu/drm/radeon/radeon.h
+++ b/drivers/gpu/drm/radeon/radeon.h
@@ -1565,6 +1565,7 @@ struct radeon_dpm {
int new_active_crtc_count;
u32 current_active_crtcs;
int current_active_crtc_count;
+ bool single_display;
struct radeon_dpm_dynamic_state dyn_state;
struct radeon_dpm_fan fan;
u32 tdp_limit;
--- a/drivers/gpu/drm/radeon/radeon_pm.c
+++ b/drivers/gpu/drm/radeon/radeon_pm.c
@@ -704,12 +704,8 @@ static void radeon_dpm_thermal_work_hand
radeon_pm_compute_clocks(rdev);
}

-static struct radeon_ps *radeon_dpm_pick_power_state(struct radeon_device *rdev,
- enum radeon_pm_state_type dpm_state)
+static bool radeon_dpm_single_display(struct radeon_device *rdev)
{
- int i;
- struct radeon_ps *ps;
- u32 ui_class;
bool single_display = (rdev->pm.dpm.new_active_crtc_count < 2) ?
true : false;

@@ -719,6 +715,17 @@ static struct radeon_ps *radeon_dpm_pick
single_display = false;
}

+ return single_display;
+}
+
+static struct radeon_ps *radeon_dpm_pick_power_state(struct radeon_device *rdev,
+ enum radeon_pm_state_type dpm_state)
+{
+ int i;
+ struct radeon_ps *ps;
+ u32 ui_class;
+ bool single_display = radeon_dpm_single_display(rdev);
+
/* certain older asics have a separare 3D performance state,
* so try that first if the user selected performance
*/
@@ -844,6 +851,7 @@ static void radeon_dpm_change_power_stat
struct radeon_ps *ps;
enum radeon_pm_state_type dpm_state;
int ret;
+ bool single_display = radeon_dpm_single_display(rdev);

/* if dpm init failed */
if (!rdev->pm.dpm_enabled)
@@ -868,6 +876,9 @@ static void radeon_dpm_change_power_stat
/* vce just modifies an existing state so force a change */
if (ps->vce_active != rdev->pm.dpm.vce_active)
goto force;
+ /* user has made a display change (such as timing) */
+ if (rdev->pm.dpm.single_display != single_display)
+ goto force;
if ((rdev->family < CHIP_BARTS) || (rdev->flags & RADEON_IS_IGP)) {
/* for pre-BTC and APUs if the num crtcs changed but state is the same,
* all we need to do is update the display configuration.
@@ -930,6 +941,7 @@ force:

rdev->pm.dpm.current_active_crtcs = rdev->pm.dpm.new_active_crtcs;
rdev->pm.dpm.current_active_crtc_count = rdev->pm.dpm.new_active_crtc_count;
+ rdev->pm.dpm.single_display = single_display;

/* wait for the rings to drain */
for (i = 0; i < RADEON_NUM_RINGS; i++) {



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