drm/radeon: Fix overflow of watermark calcs at > 4k resolutions.

Commit e6b9a6c84b93
("drm/radeon: Make display watermark calculations more accurate")
made watermark calculations more accurate, but not for > 4k
resolutions on 32-Bit architectures, as it introduced an integer
overflow for those setups and resolutions.

Fix this by proper u64 casting and division.

Signed-off-by: Mario Kleiner <mario.kleiner.de@gmail.com>
Reported-by: Ben Hutchings <ben.hutchings@codethink.co.uk>
Fixes: e6b9a6c84b93 ("drm/radeon: Make display watermark calculations more accurate")
Cc: Ben Hutchings <ben.hutchings@codethink.co.uk>
Cc: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

3 files changed, 15 insertions, 6 deletions

diff --git a/drivers/gpu/drm/radeon/cik.c b/drivers/gpu/drm/radeon/cik.c
index 008c145b7f29..ca44233ceacc 100644
--- a/drivers/gpu/drm/radeon/cik.c
+++ b/drivers/gpu/drm/radeon/cik.c
@@ -9267,8 +9267,11 @@ static void dce8_program_watermarks(struct radeon_device *rdev,
         u32 tmp, wm_mask;
 
         if (radeon_crtc->base.enabled && num_heads && mode) {
-                active_time = 1000000UL * (u32)mode->crtc_hdisplay / (u32)mode->clock;
-                line_time = min((u32) (1000000UL * (u32)mode->crtc_htotal / (u32)mode->clock), (u32)65535);
+                active_time = (u32) div_u64((u64)mode->crtc_hdisplay * 1000000,
+                                            (u32)mode->clock);
+                line_time = (u32) div_u64((u64)mode->crtc_htotal * 1000000,
+                                          (u32)mode->clock);
+                line_time = min(line_time, (u32)65535);
 
                 /* watermark for high clocks */
                 if ((rdev->pm.pm_method == PM_METHOD_DPM) &&
diff --git a/drivers/gpu/drm/radeon/evergreen.c b/drivers/gpu/drm/radeon/evergreen.c
index 0bf103536404..534637203e70 100644
--- a/drivers/gpu/drm/radeon/evergreen.c
+++ b/drivers/gpu/drm/radeon/evergreen.c
@@ -2266,8 +2266,11 @@ static void evergreen_program_watermarks(struct radeon_device *rdev,
         fixed20_12 a, b, c;
 
         if (radeon_crtc->base.enabled && num_heads && mode) {
-                active_time = 1000000UL * (u32)mode->crtc_hdisplay / (u32)mode->clock;
-                line_time = min((u32) (1000000UL * (u32)mode->crtc_htotal / (u32)mode->clock), (u32)65535);
+                active_time = (u32) div_u64((u64)mode->crtc_hdisplay * 1000000,
+                                            (u32)mode->clock);
+                line_time = (u32) div_u64((u64)mode->crtc_htotal * 1000000,
+                                          (u32)mode->clock);
+                line_time = min(line_time, (u32)65535);
                 priority_a_cnt = 0;
                 priority_b_cnt = 0;
                 dram_channels = evergreen_get_number_of_dram_channels(rdev);
diff --git a/drivers/gpu/drm/radeon/si.c b/drivers/gpu/drm/radeon/si.c
index 76d1888528e6..5303f25d5280 100644
--- a/drivers/gpu/drm/radeon/si.c
+++ b/drivers/gpu/drm/radeon/si.c
@@ -2284,8 +2284,11 @@ static void dce6_program_watermarks(struct radeon_device *rdev,
         fixed20_12 a, b, c;
 
         if (radeon_crtc->base.enabled && num_heads && mode) {
-                active_time = 1000000UL * (u32)mode->crtc_hdisplay / (u32)mode->clock;
-                line_time = min((u32) (1000000UL * (u32)mode->crtc_htotal / (u32)mode->clock), (u32)65535);
+                active_time = (u32) div_u64((u64)mode->crtc_hdisplay * 1000000,
+                                            (u32)mode->clock);
+                line_time = (u32) div_u64((u64)mode->crtc_htotal * 1000000,
+                                          (u32)mode->clock);
+                line_time = min(line_time, (u32)65535);
                 priority_a_cnt = 0;
                 priority_b_cnt = 0;