linux-kernel - [PATCH 6/8] drm/tidss: Add IO CTRL and Power support for OLDI TX in AM625

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Date:   Tue, 19 Jul 2022 13:38:43 +0530
From:   Aradhya Bhatia <a-bhatia1@...com>
To:     Tomi Valkeinen <tomba@...nel.org>, Jyri Sarha <jyri.sarha@....fi>,
        Rob Herring <robh+dt@...nel.org>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>
CC:     Darren Etheridge <detheridge@...com>, Nishanth Menon <nm@...com>,
        Vignesh Raghavendra <vigneshr@...com>,
        Rahul T R <r-ravikumar@...com>,
        Krunal Bhargav <k-bhargav@...com>,
        Devarsh Thakkar <devarsht@...com>,
        DRI Development List <dri-devel@...ts.freedesktop.org>,
        Devicetree List <devicetree@...r.kernel.org>,
        Linux Kernel List <linux-kernel@...r.kernel.org>
Subject: [PATCH 6/8] drm/tidss: Add IO CTRL and Power support for OLDI TX in AM625

The ctrl MMR module of the AM625 is different from the AM65X SoC. As a
result, the memory-mapped regsiters that control the OLDI TX power and
loopback have diverged in AM625 SoC.

Add support for the controller in AM625 and control OLDI.

Signed-off-by: Aradhya Bhatia <a-bhatia1@...com>
---
 drivers/gpu/drm/tidss/tidss_dispc.c      | 70 +++++++++++++++++++-----
 drivers/gpu/drm/tidss/tidss_dispc_regs.h |  6 ++
 2 files changed, 62 insertions(+), 14 deletions(-)

diff --git a/drivers/gpu/drm/tidss/tidss_dispc.c b/drivers/gpu/drm/tidss/tidss_dispc.c
index 94fce035c1d7..c4a5f808648f 100644
--- a/drivers/gpu/drm/tidss/tidss_dispc.c
+++ b/drivers/gpu/drm/tidss/tidss_dispc.c
@@ -934,21 +934,57 @@ int dispc_vp_bus_check(struct dispc_device *dispc, u32 hw_videoport,
 
 static void dispc_oldi_tx_power(struct dispc_device *dispc, bool power)
 {
-	u32 val = power ? 0 : OLDI_PWRDN_TX;
+	u32 val;
 
 	if (WARN_ON(!dispc->oldi_io_ctrl))
 		return;
 
-	regmap_update_bits(dispc->oldi_io_ctrl, OLDI_DAT0_IO_CTRL,
-			   OLDI_PWRDN_TX, val);
-	regmap_update_bits(dispc->oldi_io_ctrl, OLDI_DAT1_IO_CTRL,
-			   OLDI_PWRDN_TX, val);
-	regmap_update_bits(dispc->oldi_io_ctrl, OLDI_DAT2_IO_CTRL,
-			   OLDI_PWRDN_TX, val);
-	regmap_update_bits(dispc->oldi_io_ctrl, OLDI_DAT3_IO_CTRL,
-			   OLDI_PWRDN_TX, val);
-	regmap_update_bits(dispc->oldi_io_ctrl, OLDI_CLK_IO_CTRL,
-			   OLDI_PWRDN_TX, val);
+	if (dispc->feat->subrev == DISPC_AM65X) {
+		val = power ? 0 : OLDI_PWRDN_TX;
+
+		regmap_update_bits(dispc->oldi_io_ctrl, OLDI_DAT0_IO_CTRL,
+				   OLDI_PWRDN_TX, val);
+		regmap_update_bits(dispc->oldi_io_ctrl, OLDI_DAT1_IO_CTRL,
+				   OLDI_PWRDN_TX, val);
+		regmap_update_bits(dispc->oldi_io_ctrl, OLDI_DAT2_IO_CTRL,
+				   OLDI_PWRDN_TX, val);
+		regmap_update_bits(dispc->oldi_io_ctrl, OLDI_DAT3_IO_CTRL,
+				   OLDI_PWRDN_TX, val);
+		regmap_update_bits(dispc->oldi_io_ctrl, OLDI_CLK_IO_CTRL,
+				   OLDI_PWRDN_TX, val);
+
+	} else if (dispc->feat->subrev == DISPC_AM625) {
+		if (power) {
+			switch (dispc->oldi_mode) {
+			case OLDI_SINGLE_LINK_SINGLE_MODE_0:
+				/* Power down OLDI TX 1*/
+				val = OLDI1_PWRDN_TX;
+				break;
+
+			case OLDI_SINGLE_LINK_SINGLE_MODE_1:
+				/* Power down OLDI TX 0*/
+				val = OLDI0_PWRDN_TX;
+				break;
+
+			case OLDI_SINGLE_LINK_DUPLICATE_MODE:
+			case OLDI_DUAL_LINK:
+				/* No Power down */
+				val = 0;
+				break;
+
+			default:
+				/* Power down both the OLDI TXes */
+				val = OLDI0_PWRDN_TX | OLDI1_PWRDN_TX;
+				break;
+			}
+		} else {
+			/* Power down both the OLDI TXes */
+			val = OLDI0_PWRDN_TX | OLDI1_PWRDN_TX;
+		}
+
+		regmap_update_bits(dispc->oldi_io_ctrl, OLDI_PD_CTRL,
+				   OLDI0_PWRDN_TX | OLDI1_PWRDN_TX, val);
+	}
 }
 
 static void dispc_set_num_datalines(struct dispc_device *dispc,
@@ -2701,9 +2737,15 @@ static int dispc_iomap_resource(struct platform_device *pdev, const char *name,
 static int dispc_init_am65x_oldi_io_ctrl(struct device *dev,
 					 struct dispc_device *dispc)
 {
-	dispc->oldi_io_ctrl =
-		syscon_regmap_lookup_by_phandle(dev->of_node,
-						"ti,am65x-oldi-io-ctrl");
+	if (dispc->feat->subrev == DISPC_AM65X)
+		dispc->oldi_io_ctrl =
+			syscon_regmap_lookup_by_phandle(dev->of_node,
+							"ti,am65x-oldi-io-ctrl");
+	else
+		dispc->oldi_io_ctrl =
+			syscon_regmap_lookup_by_phandle(dev->of_node,
+							"ti,am625-oldi-io-ctrl");
+
 	if (PTR_ERR(dispc->oldi_io_ctrl) == -ENODEV) {
 		dispc->oldi_io_ctrl = NULL;
 	} else if (IS_ERR(dispc->oldi_io_ctrl)) {
diff --git a/drivers/gpu/drm/tidss/tidss_dispc_regs.h b/drivers/gpu/drm/tidss/tidss_dispc_regs.h
index 13feedfe5d6d..510bee70b3b8 100644
--- a/drivers/gpu/drm/tidss/tidss_dispc_regs.h
+++ b/drivers/gpu/drm/tidss/tidss_dispc_regs.h
@@ -238,6 +238,12 @@ enum dispc_common_regs {
 #define OLDI_DAT3_IO_CTRL			0x0C
 #define OLDI_CLK_IO_CTRL			0x10
 
+/* Only for AM625 OLDI TX */
+#define OLDI_PD_CTRL				0x100
+#define OLDI_LB_CTRL				0x104
+
 #define OLDI_PWRDN_TX				BIT(8)
+#define OLDI0_PWRDN_TX				BIT(0)
+#define OLDI1_PWRDN_TX				BIT(1)
 
 #endif /* __TIDSS_DISPC_REGS_H */
-- 
2.37.0