From: Nathan Chancellor <natechancellor@gmail.com>
To: "Harry Wentland" <harry.wentland@amd.com>,
"Leo Li" <sunpeng.li@amd.com>,
"Alex Deucher" <alexander.deucher@amd.com>,
"Christian König" <christian.koenig@amd.com>,
"David (ChunMing) Zhou" <David1.Zhou@amd.com>
Cc: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>,
amd-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org,
linux-kernel@vger.kernel.org,
Nathan Chancellor <natechancellor@gmail.com>
Subject: [PATCH] drm/amd/display: Fix 64-bit division error on 32-bit platforms in mod_freesync_build_vrr_params
Date: Mon, 30 Mar 2020 15:16:14 -0700 [thread overview]
Message-ID: <20200330221614.7661-1-natechancellor@gmail.com> (raw)
When building arm32 allyesconfig,
ld.lld: error: undefined symbol: __aeabi_uldivmod
>>> referenced by freesync.c
>>> gpu/drm/amd/display/modules/freesync/freesync.o:(mod_freesync_build_vrr_params) in archive drivers/built-in.a
>>> did you mean: __aeabi_uidivmod
>>> defined in: arch/arm/lib/lib.a(lib1funcs.o)
Use div_u64 in the two locations that do 64-bit divisior, which both
have a u64 dividend and u32 divisor.
Fixes: 349a370781de ("drm/amd/display: LFC not working on 2.0x range monitors")
Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>
---
drivers/gpu/drm/amd/display/modules/freesync/freesync.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/amd/display/modules/freesync/freesync.c b/drivers/gpu/drm/amd/display/modules/freesync/freesync.c
index 8911f01671aa..c33454a9e0b4 100644
--- a/drivers/gpu/drm/amd/display/modules/freesync/freesync.c
+++ b/drivers/gpu/drm/amd/display/modules/freesync/freesync.c
@@ -761,10 +761,10 @@ void mod_freesync_build_vrr_params(struct mod_freesync *mod_freesync,
// If a monitor reports exactly max refresh of 2x of min, enforce it on nominal
rounded_nominal_in_uhz =
- ((nominal_field_rate_in_uhz + 50000) / 100000) * 100000;
+ div_u64(nominal_field_rate_in_uhz + 50000, 100000) * 100000;
if (in_config->max_refresh_in_uhz == (2 * in_config->min_refresh_in_uhz) &&
in_config->max_refresh_in_uhz == rounded_nominal_in_uhz)
- min_refresh_in_uhz = nominal_field_rate_in_uhz / 2;
+ min_refresh_in_uhz = div_u64(nominal_field_rate_in_uhz, 2);
if (!vrr_settings_require_update(core_freesync,
in_config, (unsigned int)min_refresh_in_uhz, (unsigned int)max_refresh_in_uhz,
--
2.26.0
next reply other threads:[~2020-03-30 22:16 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-30 22:16 Nathan Chancellor [this message]
2020-03-31 14:37 ` [PATCH] drm/amd/display: Fix 64-bit division error on 32-bit platforms in mod_freesync_build_vrr_params Alex Deucher
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