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SubjectRe: [PATCH] drm/amd/display: Fix 32-bit divide error in wait_for_alt_mode
Date
On 2019-08-20 7:57 p.m., Nathan Chancellor wrote:
> When building arm32 allyesconfig:
>
> ld.lld: error: undefined symbol: __aeabi_uldivmod
>>>> referenced by dc_link.c
>>>> gpu/drm/amd/display/dc/core/dc_link.o:(wait_for_alt_mode) in archive drivers/built-in.a
>>>> referenced by dc_link.c
>>>> gpu/drm/amd/display/dc/core/dc_link.o:(wait_for_alt_mode) in archive drivers/built-in.a
>
> time_taken_in_ns is of type unsigned long long so we need to use div_u64
> to avoid this error.
>
> Fixes: b5b1f4554904 ("drm/amd/display: Enable type C hotplug")
> Reported-by: Randy Dunlap <rdunlap@infradead.org>
> Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>

Reviewed-by: Harry Wentland <harry.wentland@amd.com>

Harry

> ---
> drivers/gpu/drm/amd/display/dc/core/dc_link.c | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_link.c b/drivers/gpu/drm/amd/display/dc/core/dc_link.c
> index f2d78d7b089e..8634923b4444 100644
> --- a/drivers/gpu/drm/amd/display/dc/core/dc_link.c
> +++ b/drivers/gpu/drm/amd/display/dc/core/dc_link.c
> @@ -721,7 +721,7 @@ bool wait_for_alt_mode(struct dc_link *link)
> time_taken_in_ns = dm_get_elapse_time_in_ns(
> link->ctx, finish_timestamp, enter_timestamp);
> DC_LOG_WARNING("Alt mode entered finished after %llu ms\n",
> - time_taken_in_ns / 1000000);
> + div_u64(time_taken_in_ns, 1000000));
> return true;
> }
>
> @@ -730,7 +730,7 @@ bool wait_for_alt_mode(struct dc_link *link)
> time_taken_in_ns = dm_get_elapse_time_in_ns(link->ctx, finish_timestamp,
> enter_timestamp);
> DC_LOG_WARNING("Alt mode has timed out after %llu ms\n",
> - time_taken_in_ns / 1000000);
> + div_u64(time_taken_in_ns, 1000000));
> return false;
> }
>
>
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