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From: Lauri Tirkkonen To: linux-kernel@vger.kernel.org Cc: stable@vger.kernel.org, Mario Limonciello , amd-gfx@lists.freedesktop.org, Wayne Lin , Alex Deucher , Greg Kroah-Hartman Subject: [REGRESSION] [PATCH v2] drm/amd/display: fix initial backlight brightness calculation Message-ID: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Disposition: inline X-Migadu-Flow: FLOW_OUT Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" DIV_ROUND_CLOSEST(x, 100) returns either 0 or 1 if 0 Cc: stable@vger.kernel.org Reviewed-by: Mario Limonciello --- drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gp= u/drm/amd/display/amdgpu_dm/amdgpu_dm.c index f58fa5da7fe5..8a5b5dfad1ab 100644 --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c @@ -4941,9 +4941,9 @@ amdgpu_dm_register_backlight_device(struct amdgpu_dm_= connector *aconnector) caps =3D &dm->backlight_caps[aconnector->bl_idx]; if (get_brightness_range(caps, &min, &max)) { if (power_supply_is_system_supplied() > 0) - props.brightness =3D (max - min) * DIV_ROUND_CLOSEST(caps->ac_level, 10= 0); + props.brightness =3D DIV_ROUND_CLOSEST((max - min) * caps->ac_level, 10= 0); else - props.brightness =3D (max - min) * DIV_ROUND_CLOSEST(caps->dc_level, 10= 0); + props.brightness =3D DIV_ROUND_CLOSEST((max - min) * caps->dc_level, 10= 0); /* min is zero, so max needs to be adjusted */ props.max_brightness =3D max - min; drm_dbg(drm, "Backlight caps: min: %d, max: %d, ac %d, dc %d\n", min, ma= x, --=20 2.50.1 --=20 Lauri Tirkkonen | lotheac @ IRCnet