linux-kernel - [PATCH 1/5] soc: imx: imx8m-blk-ctrl: Fix imx8mm mipi reset

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Message-Id: <20211105134228.731331-1-aford173@gmail.com>
Date:   Fri,  5 Nov 2021 08:42:24 -0500
From:   Adam Ford <aford173@...il.com>
To:     linux-arm-kernel@...ts.infradead.org
Cc:     tharvey@...eworks.com, frieder.schrempf@...tron.de,
        linux-media@...r.kernel.org, laurent.pinchart@...asonboard.com,
        aford@...conembedded.com, cstevens@...conembedded.com,
        Adam Ford <aford173@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Shawn Guo <shawnguo@...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>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Lucas Stach <l.stach@...gutronix.de>,
        Peng Fan <peng.fan@....com>, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 1/5] soc: imx: imx8m-blk-ctrl: Fix imx8mm mipi reset

Most of the blk-ctrl reset bits are found in one register, however
there are two bits in offset 8 for pulling the MIPI DPHY out of reset
and these need to be set when IMX8MM_DISPBLK_PD_MIPI_CSI is brought
out of reset or the MIPI_CSI hangs.

Fixes: 926e57c065df ("soc: imx: imx8m-blk-ctrl: add DISP blk-ctrl")
Signed-off-by: Adam Ford <aford173@...il.com>
---
 drivers/soc/imx/imx8m-blk-ctrl.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/soc/imx/imx8m-blk-ctrl.c b/drivers/soc/imx/imx8m-blk-ctrl.c
index 519b3651d1d9..5506bd075c35 100644
--- a/drivers/soc/imx/imx8m-blk-ctrl.c
+++ b/drivers/soc/imx/imx8m-blk-ctrl.c
@@ -17,6 +17,7 @@
 
 #define BLK_SFT_RSTN	0x0
 #define BLK_CLK_EN	0x4
+#define BLK_MIPI_RESET_DIV	0x8
 
 struct imx8m_blk_ctrl_domain;
 
@@ -36,6 +37,7 @@ struct imx8m_blk_ctrl_domain_data {
 	const char *gpc_name;
 	u32 rst_mask;
 	u32 clk_mask;
+	u32 mipi_rst_mask;
 };
 
 #define DOMAIN_MAX_CLKS 3
@@ -78,6 +80,7 @@ static int imx8m_blk_ctrl_power_on(struct generic_pm_domain *genpd)
 
 	/* put devices into reset */
 	regmap_clear_bits(bc->regmap, BLK_SFT_RSTN, data->rst_mask);
+	regmap_clear_bits(bc->regmap, BLK_MIPI_RESET_DIV, data->mipi_rst_mask);
 
 	/* enable upstream and blk-ctrl clocks to allow reset to propagate */
 	ret = clk_bulk_prepare_enable(data->num_clks, domain->clks);
@@ -99,6 +102,7 @@ static int imx8m_blk_ctrl_power_on(struct generic_pm_domain *genpd)
 
 	/* release reset */
 	regmap_set_bits(bc->regmap, BLK_SFT_RSTN, data->rst_mask);
+	regmap_set_bits(bc->regmap, BLK_MIPI_RESET_DIV, data->mipi_rst_mask);
 
 	/* disable upstream clocks */
 	clk_bulk_disable_unprepare(data->num_clks, domain->clks);
@@ -122,6 +126,7 @@ static int imx8m_blk_ctrl_power_off(struct generic_pm_domain *genpd)
 	/* put devices into reset and disable clocks */
 	regmap_clear_bits(bc->regmap, BLK_SFT_RSTN, data->rst_mask);
 	regmap_clear_bits(bc->regmap, BLK_CLK_EN, data->clk_mask);
+	regmap_clear_bits(bc->regmap, BLK_MIPI_RESET_DIV, data->mipi_rst_mask);
 
 	/* power down upstream GPC domain */
 	pm_runtime_put(domain->power_dev);
@@ -488,6 +493,7 @@ static const struct imx8m_blk_ctrl_domain_data imx8mm_disp_blk_ctl_domain_data[]
 		.gpc_name = "mipi-csi",
 		.rst_mask = BIT(3) | BIT(4),
 		.clk_mask = BIT(10) | BIT(11),
+		.mipi_rst_mask = BIT(16) | BIT(17),
 	},
 };
 
-- 
2.32.0