linux-kernel - [PATCH V3 03/10] soc: imx: imx8m-blk-ctrl: add i.MX8MQ VPU blk-ctrl

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Date:   Sun, 23 Jan 2022 20:31:17 -0600
From:   Adam Ford <aford173@...il.com>
To:     linux-media@...r.kernel.org
Cc:     linux-arm-kernel@...ts.infradead.org, shawnguo@...nel.org,
        aford@...conembedded.com, Lucas Stach <l.stach@...gutronix.de>,
        Adam Ford <aford173@...il.com>,
        Ezequiel Garcia <ezequiel@...guardiasur.com.ar>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-rockchip@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-staging@...ts.linux.dev
Subject: [PATCH V3 03/10] soc: imx: imx8m-blk-ctrl: add i.MX8MQ VPU blk-ctrl

From: Lucas Stach <l.stach@...gutronix.de>

This adds the necessary bits to drive the VPU blk-ctrl on the i.MX8MQ, to
avoid putting more of this functionality into the decoder driver.

Signed-off-by: Lucas Stach <l.stach@...gutronix.de>
Signed-off-by: Adam Ford <aford173@...il.com>

diff --git a/drivers/soc/imx/imx8m-blk-ctrl.c b/drivers/soc/imx/imx8m-blk-ctrl.c
index 511e74f0db8a..122f9c884b38 100644
--- a/drivers/soc/imx/imx8m-blk-ctrl.c
+++ b/drivers/soc/imx/imx8m-blk-ctrl.c
@@ -15,6 +15,7 @@
 
 #include <dt-bindings/power/imx8mm-power.h>
 #include <dt-bindings/power/imx8mn-power.h>
+#include <dt-bindings/power/imx8mq-power.h>
 
 #define BLK_SFT_RSTN	0x0
 #define BLK_CLK_EN	0x4
@@ -589,6 +590,68 @@ static const struct imx8m_blk_ctrl_data imx8mn_disp_blk_ctl_dev_data = {
 	.num_domains = ARRAY_SIZE(imx8mn_disp_blk_ctl_domain_data),
 };
 
+static int imx8mq_vpu_power_notifier(struct notifier_block *nb,
+				     unsigned long action, void *data)
+{
+	struct imx8m_blk_ctrl *bc = container_of(nb, struct imx8m_blk_ctrl,
+						 power_nb);
+
+	if (action != GENPD_NOTIFY_ON && action != GENPD_NOTIFY_PRE_OFF)
+		return NOTIFY_OK;
+
+	/*
+	 * The ADB in the VPUMIX domain has no separate reset and clock
+	 * enable bits, but is ungated and reset together with the VPUs. The
+	 * reset and clock enable inputs to the ADB is a logical OR of the
+	 * VPU bits. In order to set the G2 fuse bits, the G2 clock must
+	 * also be enabled.
+	 */
+	regmap_set_bits(bc->regmap, BLK_SFT_RSTN, BIT(0) | BIT(1));
+	regmap_set_bits(bc->regmap, BLK_CLK_EN, BIT(0) | BIT(1));
+
+	if (action == GENPD_NOTIFY_ON) {
+		/*
+		 * On power up we have no software backchannel to the GPC to
+		 * wait for the ADB handshake to happen, so we just delay for a
+		 * bit. On power down the GPC driver waits for the handshake.
+		 */
+		udelay(5);
+
+		/* set "fuse" bits to enable the VPUs */
+		regmap_set_bits(bc->regmap, 0x8, 0xffffffff);
+		regmap_set_bits(bc->regmap, 0xc, 0xffffffff);
+		regmap_set_bits(bc->regmap, 0x10, 0xffffffff);
+	}
+
+	return NOTIFY_OK;
+}
+
+static const struct imx8m_blk_ctrl_domain_data imx8mq_vpu_blk_ctl_domain_data[] = {
+	[IMX8MQ_VPUBLK_PD_G1] = {
+		.name = "vpublk-g1",
+		.clk_names = (const char *[]){ "g1", },
+		.num_clks = 1,
+		.gpc_name = "g1",
+		.rst_mask = BIT(1),
+		.clk_mask = BIT(1),
+	},
+	[IMX8MQ_VPUBLK_PD_G2] = {
+		.name = "vpublk-g2",
+		.clk_names = (const char *[]){ "g2", },
+		.num_clks = 1,
+		.gpc_name = "g2",
+		.rst_mask = BIT(0),
+		.clk_mask = BIT(0),
+	},
+};
+
+static const struct imx8m_blk_ctrl_data imx8mq_vpu_blk_ctl_dev_data = {
+	.max_reg = 0x14,
+	.power_notifier_fn = imx8mq_vpu_power_notifier,
+	.domains = imx8mq_vpu_blk_ctl_domain_data,
+	.num_domains = ARRAY_SIZE(imx8mq_vpu_blk_ctl_domain_data),
+};
+
 static const struct of_device_id imx8m_blk_ctrl_of_match[] = {
 	{
 		.compatible = "fsl,imx8mm-vpu-blk-ctrl",
@@ -599,6 +662,9 @@ static const struct of_device_id imx8m_blk_ctrl_of_match[] = {
 	}, {
 		.compatible = "fsl,imx8mn-disp-blk-ctrl",
 		.data = &imx8mn_disp_blk_ctl_dev_data
+	}, {
+		.compatible = "fsl,imx8mq-vpu-blk-ctrl",
+		.data = &imx8mq_vpu_blk_ctl_dev_data
 	}, {
 		/* Sentinel */
 	}
-- 
2.32.0