linux-kernel - [PATCH v3 17/33] drm/mediatek: mtk_hdmi: Move N/CTS setting to new function

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Message-ID: <20241217154345.276919-18-angelogioacchino.delregno@collabora.com>
Date: Tue, 17 Dec 2024 16:43:29 +0100
From: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
To: chunkuang.hu@...nel.org
Cc: p.zabel@...gutronix.de,
	airlied@...il.com,
	simona@...ll.ch,
	maarten.lankhorst@...ux.intel.com,
	mripard@...nel.org,
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	robh@...nel.org,
	krzk+dt@...nel.org,
	conor+dt@...nel.org,
	matthias.bgg@...il.com,
	angelogioacchino.delregno@...labora.com,
	ck.hu@...iatek.com,
	jitao.shi@...iatek.com,
	jie.qiu@...iatek.com,
	junzhi.zhao@...iatek.com,
	dri-devel@...ts.freedesktop.org,
	linux-mediatek@...ts.infradead.org,
	devicetree@...r.kernel.org,
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	dmitry.baryshkov@...aro.org
Subject: [PATCH v3 17/33] drm/mediatek: mtk_hdmi: Move N/CTS setting to new function

In preparation for splitting common bits of this driver, moving
the hdmi_rec_n_table struct array, and the hdmi_recommended_n(),
hdmi_mode_clock_to_hz(), hdmi_expected_cts() functions, add one
function called mtk_hdmi_get_ncts() that sets both N and CTS in
a single call.

Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
---
 drivers/gpu/drm/mediatek/mtk_hdmi.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/mediatek/mtk_hdmi.c b/drivers/gpu/drm/mediatek/mtk_hdmi.c
index f60c4effe905..ef8dfcb77318 100644
--- a/drivers/gpu/drm/mediatek/mtk_hdmi.c
+++ b/drivers/gpu/drm/mediatek/mtk_hdmi.c
@@ -682,6 +682,13 @@ static unsigned int hdmi_expected_cts(unsigned int audio_sample_rate,
 				     128 * audio_sample_rate);
 }
 
+static void mtk_hdmi_get_ncts(unsigned int sample_rate, unsigned int clock,
+			      unsigned int *n, unsigned int *cts)
+{
+	*n = hdmi_recommended_n(sample_rate, clock);
+	*cts = hdmi_expected_cts(sample_rate, clock, *n);
+}
+
 static void do_hdmi_hw_aud_set_ncts(struct mtk_hdmi *hdmi, unsigned int n,
 				    unsigned int cts)
 {
@@ -712,8 +719,7 @@ static void mtk_hdmi_hw_aud_set_ncts(struct mtk_hdmi *hdmi,
 {
 	unsigned int n, cts;
 
-	n = hdmi_recommended_n(sample_rate, clock);
-	cts = hdmi_expected_cts(sample_rate, clock, n);
+	mtk_hdmi_get_ncts(sample_rate, clock, &n, &cts);
 
 	dev_dbg(hdmi->dev, "%s: sample_rate=%u, clock=%d, cts=%u, n=%u\n",
 		__func__, sample_rate, clock, n, cts);
-- 
2.47.0