linux-kernel - Re: [PATCH V5 5/8] soc: imx: add i.MX8MP HDMI blk ctrl HDCP/HRV

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Message-ID: <2849448.e9J7NaK4W3@steina-w>
Date:   Tue, 06 Sep 2022 16:37:04 +0200
From:   Alexander Stein <alexander.stein@...tq-group.com>
To:     "Peng Fan (OSS)" <peng.fan@....nxp.com>
Cc:     robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
        shawnguo@...nel.org, s.hauer@...gutronix.de,
        linux-arm-kernel@...ts.infradead.org, kernel@...gutronix.de,
        festevam@...il.com, linux-imx@....com, l.stach@...gutronix.de,
        laurent.pinchart@...asonboard.com, marex@...x.de,
        m.felsch@...gutronix.de, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Peng Fan <peng.fan@....com>
Subject: Re: [PATCH V5 5/8] soc: imx: add i.MX8MP HDMI blk ctrl HDCP/HRV_MWR

Hello,

Am Montag, 22. August 2022, 08:45:33 CEST schrieb Peng Fan (OSS):
> From: Peng Fan <peng.fan@....com>
> 
> i.MX8MP HDMI supports HDCP and HRV_MWR(HDMI RX Video Memory Write Master
> for RXRX validation), so add them.
> 
> Signed-off-by: Peng Fan <peng.fan@....com>
> ---
>  drivers/soc/imx/imx8mp-blk-ctrl.c | 30 ++++++++++++++++++++++++++++++
>  1 file changed, 30 insertions(+)
> 
> diff --git a/drivers/soc/imx/imx8mp-blk-ctrl.c
> b/drivers/soc/imx/imx8mp-blk-ctrl.c index 6f983adcb47c..527d45d12a54 100644
> --- a/drivers/soc/imx/imx8mp-blk-ctrl.c
> +++ b/drivers/soc/imx/imx8mp-blk-ctrl.c
> @@ -235,6 +235,13 @@ static void imx8mp_hdmi_blk_ctrl_power_on(struct
> imx8mp_blk_ctrl *bc, regmap_set_bits(bc->regmap, HDMI_RTX_RESET_CTL0,
> BIT(12));
>  		regmap_clear_bits(bc->regmap, HDMI_TX_CONTROL0, BIT(3));
>  		break;
> +	case IMX8MP_HDMIBLK_PD_HDCP:
> +		regmap_set_bits(bc->regmap, HDMI_RTX_CLK_CTL0, BIT(11));
> +		break;
> +	case IMX8MP_HDMIBLK_PD_HRV:
> +		regmap_set_bits(bc->regmap, HDMI_RTX_CLK_CTL1, BIT(3) | 
BIT(4) | BIT(5));
> +		regmap_set_bits(bc->regmap, HDMI_RTX_RESET_CTL0, 
BIT(15));
> +		break;
>  	default:
>  		break;
>  	}
> @@ -283,6 +290,13 @@ static void imx8mp_hdmi_blk_ctrl_power_off(struct
> imx8mp_blk_ctrl *bc, regmap_clear_bits(bc->regmap, HDMI_RTX_RESET_CTL0,
> BIT(12));
>  		regmap_clear_bits(bc->regmap, HDMI_RTX_CLK_CTL1, BIT(22) 
| BIT(24));
>  		break;
> +	case IMX8MP_HDMIBLK_PD_HDCP:
> +		regmap_clear_bits(bc->regmap, HDMI_RTX_CLK_CTL0, 
BIT(11));
> +		break;
> +	case IMX8MP_HDMIBLK_PD_HRV:
> +		regmap_clear_bits(bc->regmap, HDMI_RTX_RESET_CTL0, 
BIT(15));
> +		regmap_clear_bits(bc->regmap, HDMI_RTX_CLK_CTL1, BIT(3) 
| BIT(4) |
> BIT(5)); +		break;
>  	default:
>  		break;
>  	}
> @@ -365,6 +379,22 @@ static const struct imx8mp_blk_ctrl_domain_data
> imx8mp_hdmi_domain_data[] = { .num_clks = 2,
>  		.gpc_name = "hdmi-tx-phy",
>  	},
> +	[IMX8MP_HDMIBLK_PD_HRV] = {
> +		.name = "hdmiblk-hrv",
> +		.clk_names = (const char *[]){ "axi", "apb" },
> +		.num_clks = 2,
> +		.gpc_name = "hrv",
> +		.path_names = (const char *[]){"hrv"},
> +		.num_paths = 1,
> +	},
> +	[IMX8MP_HDMIBLK_PD_HDCP] = {
> +		.name = "hdmiblk-hdcp",
> +		.clk_names = (const char *[]){ "axi", "apb" },
> +		.num_clks = 2,
> +		.gpc_name = "hdcp",
> +		.path_names = (const char *[]){"hdcp"},
> +		.num_paths = 1,
> +	},
>  };
> 
>  static const struct imx8mp_blk_ctrl_data imx8mp_hdmi_blk_ctl_dev_data = {

Something is missing here. Iget the following error during boot:
[    0.886211] Unable to handle kernel NULL pointer dereference at virtual 
address 0000000000000000
[    0.895043] Mem abort info:
[    0.897841]   ESR = 0x0000000096000004
[    0.901606]   EC = 0x25: DABT (current EL), IL = 32 bits
[    0.906942]   SET = 0, FnV = 0
[    0.910003]   EA = 0, S1PTW = 0
[    0.913159]   FSC = 0x04: level 0 translation fault
[    0.918054] Data abort info:
[    0.920943]   ISV = 0, ISS = 0x00000004
[    0.924791]   CM = 0, WnR = 0
[    0.927761] [0000000000000000] user address but active_mm is swapper
[    0.934157] Internal error: Oops: 96000004 [#1] PREEMPT SMP
[    0.939749] Modules linked in:
[    0.942813] CPU: 1 PID: 1 Comm: swapper/0 Not tainted 6.0.0-rc4-
next-20220906+ #674 2c55fa642ba20b0dbb66c0e78dacc9ca96d5e733
[    0.954099] Hardware name: TQ-Systems i.MX8MPlus TQMa8MPxL on MBa8MPxL (DT)
[    0.961100] pstate: 60000005 (nZCv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--)
[    0.968099] pc : kobject_set_name_vargs+0x10/0xd0
[    0.972823] lr : dev_set_name+0x58/0x80
[    0.976674] sp : ffff800009c7b860
[    0.979997] x29: ffff800009c7b860 x28: ffff000002d728f8 x27: 
0000000000000150
[    0.987172] x26: 0000000000000009 x25: 0000000000000007 x24: 
ffff800009ab8958
[    0.994347] x23: ffff0000000a0000 x22: ffff800008eb77d8 x21: 
ffff000000225410
[    1.001524] x20: ffff800008eb7808 x19: 0000000000000000 x18: 
0000000000000000
[    1.008697] x17: 702d78742d696d64 x16: 682d6b6c62696d64 x15: 
68203a656d616e3e
[    1.015872] x14: 0000000000000000 x13: 70636468203a656d x12: 
616e5f6370673e2d
[    1.023047] x11: 61746164203a6c72 x10: 74632d6b6c622e30 x9 : 
7274632d6b6c622e
[    1.030222] x8 : 3030303063663233 x7 : 205d353039393738 x6 : 
ffff800009a240e0
[    1.037397] x5 : 00000000ffffffd0 x4 : ffff800009c7b920 x3 : 
00000000ffffffd0
[    1.044572] x2 : ffff800009c7b8d0 x1 : ffff80000936ca78 x0 : 
0000000000000000
[    1.051749] Call trace:
[    1.054199]  kobject_set_name_vargs+0x10/0xd0
[    1.058574]  dev_set_name+0x58/0x80
[    1.062072]  imx8mp_blk_ctrl_probe+0x5c0/0x660
[    1.066534]  platform_probe+0x64/0x100
[    1.070297]  call_driver_probe+0x28/0x140
[    1.074322]  really_probe+0xc0/0x334
[    1.077909]  __driver_probe_device+0x84/0x144
[    1.082284]  driver_probe_device+0x38/0x130
[    1.086486]  __driver_attach+0xac/0x244
[    1.090334]  bus_for_each_dev+0x6c/0xc0
[    1.094184]  driver_attach+0x20/0x30
[    1.097772]  bus_add_driver+0x174/0x244
[    1.101622]  driver_register+0x74/0x120
[    1.105474]  __platform_driver_register+0x24/0x30
[    1.110197]  imx8mp_blk_ctrl_driver_init+0x18/0x20
[    1.115009]  do_one_initcall+0x58/0x200
[    1.118861]  do_initcalls+0x164/0x19c
[    1.122534]  kernel_init_freeable+0x134/0x17c
[    1.126909]  kernel_init+0x2c/0x150
[    1.130411]  ret_from_fork+0x10/0x20
[    1.134003] Code: a9bb7bfd 910003fd a90153f3 aa0003f3 (f9400000) 
[    1.140127] ---[ end trace 0000000000000000 ]---

Adding some debug out shows:
[    0.866795] imx8mp-blk-ctrl 32fc0000.blk-ctrl: domain->power_dev: 0x0
[    0.873257] imx8mp-blk-ctrl 32fc0000.blk-ctrl: data->name: hdmiblk-hdcp
[    0.879905] imx8mp-blk-ctrl 32fc0000.blk-ctrl: data->gpc_name: hdcp

AFAICS the power domains 'hrv' and 'hdcp' are missing in the 'hdmi_blk_ctrl: 
blk-ctrl@...c0000' node thus resulting in a NULL pointer from calling 
dev_pm_domain_attach_by_name().

Is there a patch I am missing.

Best regards,
Alexander