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Date: Mon, 2 Dec 2013 11:12:27 -0800
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-kernel@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
stable@...r.kernel.org, Alex Deucher <alexander.deucher@....com>
Subject: [PATCH 3.10 164/173] drm/radeon: use 64-bit math to calculate CTS values for audio (v2)
3.10-stable review patch. If anyone has any objections, please let me know.
------------------
From: Alex Deucher <alexander.deucher@....com>
commit 062c2e4363451d49ef840232fe65e8bff0dde2a5 upstream.
Avoid losing precision. See bug:
https://bugs.freedesktop.org/show_bug.cgi?id=69675
v2: fix math as per Anssi's comments.
Signed-off-by: Alex Deucher <alexander.deucher@....com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
drivers/gpu/drm/radeon/r600_hdmi.c | 11 +++++++++--
1 file changed, 9 insertions(+), 2 deletions(-)
--- a/drivers/gpu/drm/radeon/r600_hdmi.c
+++ b/drivers/gpu/drm/radeon/r600_hdmi.c
@@ -75,8 +75,15 @@ static const struct radeon_hdmi_acr r600
*/
static void r600_hdmi_calc_cts(uint32_t clock, int *CTS, int N, int freq)
{
- if (*CTS == 0)
- *CTS = clock * N / (128 * freq) * 1000;
+ u64 n;
+ u32 d;
+
+ if (*CTS == 0) {
+ n = (u64)clock * (u64)N * 1000ULL;
+ d = 128 * freq;
+ do_div(n, d);
+ *CTS = n;
+ }
DRM_DEBUG("Using ACR timing N=%d CTS=%d for frequency %d\n",
N, *CTS, freq);
}
--
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