[PATCH 19/21] drm/mediatek: dpi: add support for dpi clock

From: Alexandre Mergnat <amergnat@baylibre.com>
To: Daniel Vetter <daniel@ffwll.ch>, CK Hu <ck.hu@mediatek.com>,
	Jitao Shi <jitao.shi@mediatek.com>,
	Thierry Reding <thierry.reding@gmail.com>,
	Philipp Zabel <p.zabel@pengutronix.de>,
	Sam Ravnborg <sam@ravnborg.org>, Rob Herring <robh+dt@kernel.org>,
	Uwe Kleine-König <u.kleine-koenig@pengutronix.de>,
	Chun-Kuang Hu <chunkuang.hu@kernel.org>,
	Matthias Brugger <matthias.bgg@gmail.com>,
	David Airlie <airlied@gmail.com>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
	Xinlei Lee <xinlei.lee@mediatek.com>
Cc: Guillaume La Roque <glaroque@baylibre.com>,
	linux-arm-kernel@lists.infradead.org,
	linux-mediatek@lists.infradead.org,
	Alexandre Mergnat <amergnat@baylibre.com>,
	dri-devel@lists.freedesktop.org,
	Fabien Parent <fparent@baylibre.com>,
	Neil Armstrong <neil.armstrong@linaro.org>,
	linux-pwm@vger.kernel.org, devicetree@vger.kernel.org,
	linux-kernel@vger.kernel.org
Subject: [PATCH 19/21] drm/mediatek: dpi: add support for dpi clock
Date: Thu, 09 Mar 2023 15:23:08 +0100	[thread overview]
Message-ID: <20230220-display-v1-19-45cbc68e188b@baylibre.com> (raw)
In-Reply-To: <20230220-display-v1-0-45cbc68e188b@baylibre.com>

From: Fabien Parent <fparent@baylibre.com>

MT8365 requires an additional clock for DPI. Add support for that
additional clock.

Signed-off-by: Fabien Parent <fparent@baylibre.com>
Signed-off-by: Alexandre Mergnat <amergnat@baylibre.com>
---
 drivers/gpu/drm/mediatek/mtk_dpi.c | 18 +++++++++++++++++-
 1 file changed, 17 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/mediatek/mtk_dpi.c b/drivers/gpu/drm/mediatek/mtk_dpi.c
index 4317595a15d1..474c6e5bbf04 100644
--- a/drivers/gpu/drm/mediatek/mtk_dpi.c
+++ b/drivers/gpu/drm/mediatek/mtk_dpi.c
@@ -68,6 +68,7 @@ struct mtk_dpi {
 	struct device *dev;
 	struct clk *engine_clk;
 	struct clk *pixel_clk;
+	struct clk *dpi_clk;
 	struct clk *tvd_clk;
 	int irq;
 	struct drm_display_mode mode;
@@ -464,6 +465,7 @@ static void mtk_dpi_power_off(struct mtk_dpi *dpi)
 	mtk_dpi_disable(dpi);
 	clk_disable_unprepare(dpi->pixel_clk);
 	clk_disable_unprepare(dpi->engine_clk);
+	clk_disable_unprepare(dpi->dpi_clk);
 }
 
 static int mtk_dpi_power_on(struct mtk_dpi *dpi)
@@ -473,10 +475,16 @@ static int mtk_dpi_power_on(struct mtk_dpi *dpi)
 	if (++dpi->refcount != 1)
 		return 0;
 
+	ret = clk_prepare_enable(dpi->dpi_clk);
+	if (ret) {
+		dev_err(dpi->dev, "failed to enable dpi clock: %d\n", ret);
+		goto err_refcount;
+	}
+
 	ret = clk_prepare_enable(dpi->engine_clk);
 	if (ret) {
 		dev_err(dpi->dev, "Failed to enable engine clock: %d\n", ret);
-		goto err_refcount;
+		goto err_engine;
 	}
 
 	ret = clk_prepare_enable(dpi->pixel_clk);
@@ -489,6 +497,8 @@ static int mtk_dpi_power_on(struct mtk_dpi *dpi)
 
 err_pixel:
 	clk_disable_unprepare(dpi->engine_clk);
+err_engine:
+	clk_disable_unprepare(dpi->dpi_clk);
 err_refcount:
 	dpi->refcount--;
 	return ret;
@@ -1044,6 +1054,12 @@ static int mtk_dpi_probe(struct platform_device *pdev)
 		return ret;
 	}
 
+	dpi->dpi_clk = devm_clk_get_optional(dev, "dpi");
+	if (IS_ERR(dpi->dpi_clk)) {
+		return dev_err_probe(dev, ret, "Failed to get dpi clock: %p\n",
+				     dpi->dpi_clk);
+	}
+
 	dpi->irq = platform_get_irq(pdev, 0);
 	if (dpi->irq <= 0)
 		return -EINVAL;

-- 
b4 0.10.1

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