linux-kernel - [PATCH AUTOSEL 5.4 39/79] drm/mediatek: mtk_dpi: Add checks for reg_h_fre

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Message-Id: <20250505232151.2698893-39-sashal@kernel.org>
Date: Mon,  5 May 2025 19:21:11 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
	CK Hu <ck.hu@...iatek.com>,
	Chun-Kuang Hu <chunkuang.hu@...nel.org>,
	Sasha Levin <sashal@...nel.org>,
	p.zabel@...gutronix.de,
	airlied@...il.com,
	simona@...ll.ch,
	matthias.bgg@...il.com,
	dri-devel@...ts.freedesktop.org,
	linux-mediatek@...ts.infradead.org,
	linux-arm-kernel@...ts.infradead.org
Subject: [PATCH AUTOSEL 5.4 39/79] drm/mediatek: mtk_dpi: Add checks for reg_h_fre_con existence

From: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>

[ Upstream commit 8c9da7cd0bbcc90ab444454fecf535320456a312 ]

In preparation for adding support for newer DPI instances which
do support direct-pin but do not have any H_FRE_CON register,
like the one found in MT8195 and MT8188, add a branch to check
if the reg_h_fre_con variable was declared in the mtk_dpi_conf
structure for the probed SoC DPI version.

As a note, this is useful specifically only for cases in which
the support_direct_pin variable is true, so mt8195-dpintf is
not affected by any issue.

Reviewed-by: CK Hu <ck.hu@...iatek.com>
Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
Link: https://patchwork.kernel.org/project/dri-devel/patch/20250217154836.108895-6-angelogioacchino.delregno@collabora.com/
Signed-off-by: Chun-Kuang Hu <chunkuang.hu@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/gpu/drm/mediatek/mtk_dpi.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/mediatek/mtk_dpi.c b/drivers/gpu/drm/mediatek/mtk_dpi.c
index 191e0cec004b4..6d105e8aae459 100644
--- a/drivers/gpu/drm/mediatek/mtk_dpi.c
+++ b/drivers/gpu/drm/mediatek/mtk_dpi.c
@@ -337,12 +337,13 @@ static void mtk_dpi_config_swap_input(struct mtk_dpi *dpi, bool enable)
 
 static void mtk_dpi_config_2n_h_fre(struct mtk_dpi *dpi)
 {
-	mtk_dpi_mask(dpi, dpi->conf->reg_h_fre_con, H_FRE_2N, H_FRE_2N);
+	if (dpi->conf->reg_h_fre_con)
+		mtk_dpi_mask(dpi, dpi->conf->reg_h_fre_con, H_FRE_2N, H_FRE_2N);
 }
 
 static void mtk_dpi_config_disable_edge(struct mtk_dpi *dpi)
 {
-	if (dpi->conf->edge_sel_en)
+	if (dpi->conf->edge_sel_en && dpi->conf->reg_h_fre_con)
 		mtk_dpi_mask(dpi, dpi->conf->reg_h_fre_con, 0, EDGE_SEL_EN);
 }
 
-- 
2.39.5