linux-kernel - [PATCH v3 6/8] phy: rockchip: samsung-hdptx: Add high color depth management

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Message-Id: <20250223-phy-sam-hdptx-bpc-v3-6-66a5c8e68327@collabora.com>
Date: Sun, 23 Feb 2025 13:02:13 +0200
From: Cristian Ciocaltea <cristian.ciocaltea@...labora.com>
To: Vinod Koul <vkoul@...nel.org>, 
 Kishon Vijay Abraham I <kishon@...nel.org>, 
 Heiko Stuebner <heiko@...ech.de>
Cc: Algea Cao <algea.cao@...k-chips.com>, Sandor Yu <Sandor.yu@....com>, 
 Dmitry Baryshkov <dmitry.baryshkov@...aro.org>, 
 Maxime Ripard <mripard@...nel.org>, kernel@...labora.com, 
 linux-kernel@...r.kernel.org, linux-phy@...ts.infradead.org, 
 linux-arm-kernel@...ts.infradead.org, linux-rockchip@...ts.infradead.org
Subject: [PATCH v3 6/8] phy: rockchip: samsung-hdptx: Add high color depth
 management

Add support for 8-bit, 10-bit, 12-bit and 16-bit color depth setup.

Signed-off-by: Cristian Ciocaltea <cristian.ciocaltea@...labora.com>
---
 drivers/phy/rockchip/phy-rockchip-samsung-hdptx.c | 20 +++++++++++++++++++-
 1 file changed, 19 insertions(+), 1 deletion(-)

diff --git a/drivers/phy/rockchip/phy-rockchip-samsung-hdptx.c b/drivers/phy/rockchip/phy-rockchip-samsung-hdptx.c
index dd91a7272e246b2133112effdb080a847fd15abe..792ed3d1459f84e735041f55cac15941f6f785ef 100644
--- a/drivers/phy/rockchip/phy-rockchip-samsung-hdptx.c
+++ b/drivers/phy/rockchip/phy-rockchip-samsung-hdptx.c
@@ -404,6 +404,7 @@ struct rk_hdptx_phy {
 
 	/* PHY config opts */
 	unsigned long tmds_char_rate;
+	unsigned int bpc;
 
 	/* clk provider */
 	struct clk_hw hw;
@@ -1032,6 +1033,9 @@ static int rk_hdptx_ropll_tmds_cmn_config(struct rk_hdptx_phy *hdptx,
 	regmap_update_bits(hdptx->regmap, CMN_REG(0086), PLL_PCG_POSTDIV_SEL_MASK,
 			   FIELD_PREP(PLL_PCG_POSTDIV_SEL_MASK, cfg->pms_sdiv));
 
+	regmap_update_bits(hdptx->regmap, CMN_REG(0086), PLL_PCG_CLK_SEL_MASK,
+			   FIELD_PREP(PLL_PCG_CLK_SEL_MASK, (hdptx->bpc - 8) >> 1));
+
 	regmap_update_bits(hdptx->regmap, CMN_REG(0086), PLL_PCG_CLK_EN_MASK,
 			   FIELD_PREP(PLL_PCG_CLK_EN_MASK, 0x1));
 
@@ -1430,7 +1434,7 @@ static int rk_hdptx_phy_power_on(struct phy *phy)
 		rate = phy_get_bus_width(hdptx->phy) & 0xfffffff;
 	}
 
-	dev_dbg(hdptx->dev, "%s rate=%u\n", __func__, rate);
+	dev_dbg(hdptx->dev, "%s rate=%u bpc=%u\n", __func__, rate, hdptx->bpc);
 
 	ret = rk_hdptx_phy_consumer_get(hdptx, rate);
 	if (ret)
@@ -1741,6 +1745,19 @@ static int rk_hdptx_phy_configure(struct phy *phy, union phy_configure_opts *opt
 
 	if (mode != PHY_MODE_DP) {
 		hdptx->tmds_char_rate = opts->hdmi.tmds_char_rate;
+
+		switch (opts->hdmi.bpc) {
+		case 8:
+		case 10:
+		case 12:
+		case 16:
+			hdptx->bpc = opts->hdmi.bpc;
+			break;
+		default:
+			dev_warn(hdptx->dev, "Discarded unsupported bpc: %u\n",
+				 opts->hdmi.bpc);
+		};
+
 		return 0;
 	}
 
@@ -1922,6 +1939,7 @@ static int rk_hdptx_phy_probe(struct platform_device *pdev)
 		return -ENOMEM;
 
 	hdptx->dev = dev;
+	hdptx->bpc = 8;
 
 	regs = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
 	if (IS_ERR(regs))

-- 
2.48.1