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

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Date:   Wed, 7 Sep 2022 10:41:46 +0800
From:   Peng Fan <peng.fan@....nxp.com>
To:     Alexander Stein <alexander.stein@...tq-group.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-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



On 9/6/2022 10:37 PM, Alexander Stein wrote:
> 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().

The HDMI blk ctrl dts not landed in Shawn's branch, could you share me 
your dts change?

And dev_set_name, as I recall, Lucas has a patch to remove that.

Regards,
Peng.

> 
> Is there a patch I am missing.
> 
> Best regards,
> Alexander
> 
>