drm/radeon/kms/avivo: fix some bugs in the display bandwidth setup

Signed-off-by: Alex Deucher <alexdeucher@gmail.com>
Signed-off-by: Dave Airlie <airlied@linux.ie>

diff --git a/drivers/gpu/drm/radeon/radeon_fixed.h b/drivers/gpu/drm/radeon/radeon_fixed.h
index 90187d1..3d4d84e 100644 (file)
--- a/drivers/gpu/drm/radeon/radeon_fixed.h
+++ b/drivers/gpu/drm/radeon/radeon_fixed.h
@@ -38,6 +38,23 @@ typedef union rfixed {
 #define fixed_init_half(A) { .full = rfixed_const_half((A)) }
 #define rfixed_trunc(A) ((A).full >> 12)
 
+static inline u32 rfixed_floor(fixed20_12 A)
+{
+       u32 non_frac = rfixed_trunc(A);
+
+       return rfixed_const(non_frac);
+}
+
+static inline u32 rfixed_ceil(fixed20_12 A)
+{
+       u32 non_frac = rfixed_trunc(A);
+
+       if (A.full > rfixed_const(non_frac))
+               return rfixed_const(non_frac + 1);
+       else
+               return rfixed_const(non_frac);
+}
+
 static inline u32 rfixed_div(fixed20_12 A, fixed20_12 B)
 {
        u64 tmp = ((u64)A.full << 13);

diff --git a/drivers/gpu/drm/radeon/rs690.c b/drivers/gpu/drm/radeon/rs690.c
index eb486ee..9807936 100644 (file)
--- a/drivers/gpu/drm/radeon/rs690.c
+++ b/drivers/gpu/drm/radeon/rs690.c
@@ -260,8 +260,9 @@ void rs690_crtc_bandwidth_compute(struct radeon_device *rdev,
 
        b.full = rfixed_const(mode->crtc_hdisplay);
        c.full = rfixed_const(256);
-       a.full = rfixed_mul(wm->num_line_pair, b);
-       request_fifo_depth.full = rfixed_div(a, c);
+       a.full = rfixed_div(b, c);
+       request_fifo_depth.full = rfixed_mul(a, wm->num_line_pair);
+       request_fifo_depth.full = rfixed_ceil(request_fifo_depth);
        if (a.full < rfixed_const(4)) {
                wm->lb_request_fifo_depth = 4;
        } else {
@@ -390,6 +391,7 @@ void rs690_crtc_bandwidth_compute(struct radeon_device *rdev,
        a.full = rfixed_const(16);
        wm->priority_mark_max.full = rfixed_const(crtc->base.mode.crtc_hdisplay);
        wm->priority_mark_max.full = rfixed_div(wm->priority_mark_max, a);
+       wm->priority_mark_max.full = rfixed_ceil(wm->priority_mark_max);
 
        /* Determine estimated width */
        estimated_width.full = tolerable_latency.full - wm->worst_case_latency.full;
@@ -399,6 +401,7 @@ void rs690_crtc_bandwidth_compute(struct radeon_device *rdev,
        } else {
                a.full = rfixed_const(16);
                wm->priority_mark.full = rfixed_div(estimated_width, a);
+               wm->priority_mark.full = rfixed_ceil(wm->priority_mark);
                wm->priority_mark.full = wm->priority_mark_max.full - wm->priority_mark.full;
        }
 }

diff --git a/drivers/gpu/drm/radeon/rv515.c b/drivers/gpu/drm/radeon/rv515.c
index 7793239..6aa4ad8 100644 (file)
--- a/drivers/gpu/drm/radeon/rv515.c
+++ b/drivers/gpu/drm/radeon/rv515.c
@@ -889,8 +889,9 @@ void rv515_crtc_bandwidth_compute(struct radeon_device *rdev,
 
        b.full = rfixed_const(mode->crtc_hdisplay);
        c.full = rfixed_const(256);
-       a.full = rfixed_mul(wm->num_line_pair, b);
-       request_fifo_depth.full = rfixed_div(a, c);
+       a.full = rfixed_div(b, c);
+       request_fifo_depth.full = rfixed_mul(a, wm->num_line_pair);
+       request_fifo_depth.full = rfixed_ceil(request_fifo_depth);
        if (a.full < rfixed_const(4)) {
                wm->lb_request_fifo_depth = 4;
        } else {
@@ -992,15 +993,17 @@ void rv515_crtc_bandwidth_compute(struct radeon_device *rdev,
        a.full = rfixed_const(16);
        wm->priority_mark_max.full = rfixed_const(crtc->base.mode.crtc_hdisplay);
        wm->priority_mark_max.full = rfixed_div(wm->priority_mark_max, a);
+       wm->priority_mark_max.full = rfixed_ceil(wm->priority_mark_max);
 
        /* Determine estimated width */
        estimated_width.full = tolerable_latency.full - wm->worst_case_latency.full;
        estimated_width.full = rfixed_div(estimated_width, consumption_time);
        if (rfixed_trunc(estimated_width) > crtc->base.mode.crtc_hdisplay) {
-               wm->priority_mark.full = rfixed_const(10);
+               wm->priority_mark.full = wm->priority_mark_max.full;
        } else {
                a.full = rfixed_const(16);
                wm->priority_mark.full = rfixed_div(estimated_width, a);
+               wm->priority_mark.full = rfixed_ceil(wm->priority_mark);
                wm->priority_mark.full = wm->priority_mark_max.full - wm->priority_mark.full;
        }
 }