Commit 7f7bb117 authored by Mario Kleiner's avatar Mario Kleiner Committed by Greg Kroah-Hartman

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

commit bea10413 upstream.

Commit d63c277d
("drm/amdgpu: 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: default avatarMario Kleiner <mario.kleiner.de@gmail.com>
Reported-by: default avatarBen Hutchings <ben.hutchings@codethink.co.uk>
Fixes: d63c277d ("drm/amdgpu: Make display watermark calculations more accurate")
Cc: Ben Hutchings <ben.hutchings@codethink.co.uk>
Cc: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: default avatarAlex Deucher <alexander.deucher@amd.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent f6e99a2e
......@@ -1290,8 +1290,11 @@ static void dce_v10_0_program_watermarks(struct amdgpu_device *adev,
u32 tmp, wm_mask, lb_vblank_lead_lines = 0;
if (amdgpu_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 (adev->pm.dpm_enabled) {
......
......@@ -1257,8 +1257,11 @@ static void dce_v11_0_program_watermarks(struct amdgpu_device *adev,
u32 tmp, wm_mask, lb_vblank_lead_lines = 0;
if (amdgpu_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 (adev->pm.dpm_enabled) {
......
......@@ -1054,8 +1054,11 @@ static void dce_v6_0_program_watermarks(struct amdgpu_device *adev,
fixed20_12 a, b, c;
if (amdgpu_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;
......
......@@ -1211,8 +1211,11 @@ static void dce_v8_0_program_watermarks(struct amdgpu_device *adev,
u32 tmp, wm_mask, lb_vblank_lead_lines = 0;
if (amdgpu_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 (adev->pm.dpm_enabled) {
......
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