linux-kernel - [PATCH] drivers/dcn32:improve-warning-messsge-for-dummy_latency

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Message-Id: <20230614024718.480-1-machel@vivo.com>
Date:   Wed, 14 Jun 2023 10:46:38 +0800
From:   Wang Ming <machel@...o.com>
To:     Harry Wentland <harry.wentland@....com>,
        Leo Li <sunpeng.li@....com>,
        Rodrigo Siqueira <Rodrigo.Siqueira@....com>,
        Alex Deucher <alexander.deucher@....com>,
        Christian König <christian.koenig@....com>,
        "Pan, Xinhui" <Xinhui.Pan@....com>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>, Wang Ming <machel@...o.com>,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        amd-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org
Cc:     opensource.kernel@...o.com
Subject: [PATCH] drivers/dcn32:improve-warning-messsge-for-dummy_latency_index

 Unsigned expression compared with zero:
dummy_latency_index > 0.The return data type of the function is also int
For rigor,it is necessary to replace the data type unsigned int with int.
Otherwise,if there is a negative number,the consequences will be
disastrous.

Signed-off-by: Wang Ming <machel@...o.com>
---
 drivers/gpu/drm/amd/display/dc/dml/dcn32/dcn32_fpu.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/display/dc/dml/dcn32/dcn32_fpu.c b/drivers/gpu/drm/amd/display/dc/dml/dcn32/dcn32_fpu.c
index ad6ee4858..e351357ff 100644
--- a/drivers/gpu/drm/amd/display/dc/dml/dcn32/dcn32_fpu.c
+++ b/drivers/gpu/drm/amd/display/dc/dml/dcn32/dcn32_fpu.c
@@ -1941,7 +1941,7 @@ void dcn32_calculate_wm_and_dlg_fpu(struct dc *dc, struct dc_state *context,
        double dcfclk_from_fw_based_mclk_switching = dcfclk_from_validation;
        bool pstate_en = context->bw_ctx.dml.vba.DRAMClockChangeSupport[vlevel][context->bw_ctx.dml.vba.maxMpcComb] !=
                        dm_dram_clock_change_unsupported;
-       unsigned int dummy_latency_index = 0;
+       int dummy_latency_index = 0;
        int maxMpcComb = context->bw_ctx.dml.vba.maxMpcComb;
        unsigned int min_dram_speed_mts = context->bw_ctx.dml.vba.DRAMSpeed;
        bool subvp_in_use = dcn32_subvp_in_use(dc, context);
--
2.25.1

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