linux-kernel - [PATCH 1/3] drm/amd/display: Fix an erroneous sanity check in get_dmif_switch_time

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Date:   Mon, 29 May 2023 09:18:54 +0200
From:   Christophe JAILLET <christophe.jaillet@...adoo.fr>
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>
Cc:     linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        amd-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org
Subject: [PATCH 1/3] drm/amd/display: Fix an erroneous sanity check in get_dmif_switch_time_us()

It is likely that there is a typo in the sanity check for 'v_total'.

If it is 0, then 'pixels_per_frame' will also be 0, and in this case,
we also return 'single_frame_time_multiplier * min_single_frame_time_us'.

So test for !v_total which looks much more logical.

Fixes: 4562236b3bc0 ("drm/amd/dc: Add dc display driver (v2)")
Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
---
 drivers/gpu/drm/amd/display/dc/dce/dce_mem_input.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/display/dc/dce/dce_mem_input.c b/drivers/gpu/drm/amd/display/dc/dce/dce_mem_input.c
index 4cdd4dacb761..091f0d68a045 100644
--- a/drivers/gpu/drm/amd/display/dc/dce/dce_mem_input.c
+++ b/drivers/gpu/drm/amd/display/dc/dce/dce_mem_input.c
@@ -683,7 +683,7 @@ static uint32_t get_dmif_switch_time_us(
 	/*return double of frame time*/
 	const uint32_t single_frame_time_multiplier = 2;
 
-	if (!h_total || v_total || !pix_clk_khz)
+	if (!h_total || !v_total || !pix_clk_khz)
 		return single_frame_time_multiplier * min_single_frame_time_us;
 
 	/*TODO: should we use pixel format normalized pixel clock here?*/
-- 
2.34.1