linux-kernel - Re: [PATCH v6 3/7] media: platform: qcom/iris: introduce optional controller_rst

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Message-ID: <35ffb534-fb8d-4023-1ac0-cb1f37d0448a@quicinc.com>
Date: Wed, 16 Apr 2025 13:16:24 +0530
From: Dikshita Agarwal <quic_dikshita@...cinc.com>
To: Neil Armstrong <neil.armstrong@...aro.org>,
        Vikash Garodia
	<quic_vgarodia@...cinc.com>,
        Abhinav Kumar <quic_abhinavk@...cinc.com>,
        "Mauro Carvalho Chehab" <mchehab@...nel.org>,
        Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Bryan O'Donoghue
	<bryan.odonoghue@...aro.org>
CC: <linux-media@...r.kernel.org>, <linux-arm-msm@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v6 3/7] media: platform: qcom/iris: introduce optional
 controller_rst_tbl



On 4/15/2025 7:17 PM, Neil Armstrong wrote:
> Introduce an optional controller_rst_tbl use to store reset lines
> used to reset part of the controller.
> 
> This is necessary for the vpu3 support, when the xo reset line
> must be asserted separately from the other reset line
> on power off operation.
> 
> Factor the iris_init_resets() logic to allow requesting
> multiple reset tables.
> 
> Reviewed-by: Bryan O'Donoghue <bryan.odonoghue@...aro.org>
> Tested-by: Bryan O'Donoghue <bryan.odonoghue@...aro.org> # x1e Dell
> Signed-off-by: Neil Armstrong <neil.armstrong@...aro.org>
> ---
>  drivers/media/platform/qcom/iris/iris_core.h       |  2 ++
>  .../platform/qcom/iris/iris_platform_common.h      |  2 ++
>  drivers/media/platform/qcom/iris/iris_probe.c      | 39 +++++++++++++++-------
>  3 files changed, 31 insertions(+), 12 deletions(-)
> 
> diff --git a/drivers/media/platform/qcom/iris/iris_core.h b/drivers/media/platform/qcom/iris/iris_core.h
> index 37fb4919fecc62182784b4dca90fcab47dd38a80..aeeac32a1f6d9a9fa7027e8e3db4d95f021c552e 100644
> --- a/drivers/media/platform/qcom/iris/iris_core.h
> +++ b/drivers/media/platform/qcom/iris/iris_core.h
> @@ -43,6 +43,7 @@ struct icc_info {
>   * @clock_tbl: table of iris clocks
>   * @clk_count: count of iris clocks
>   * @resets: table of iris reset clocks
> + * @controller_resets: table of controller reset clocks
>   * @iris_platform_data: a structure for platform data
>   * @state: current state of core
>   * @iface_q_table_daddr: device address for interface queue table memory
> @@ -82,6 +83,7 @@ struct iris_core {
>  	struct clk_bulk_data			*clock_tbl;
>  	u32					clk_count;
>  	struct reset_control_bulk_data		*resets;
> +	struct reset_control_bulk_data		*controller_resets;
>  	const struct iris_platform_data		*iris_platform_data;
>  	enum iris_core_state			state;
>  	dma_addr_t				iface_q_table_daddr;
> diff --git a/drivers/media/platform/qcom/iris/iris_platform_common.h b/drivers/media/platform/qcom/iris/iris_platform_common.h
> index f6b15d2805fb2004699709bb12cd7ce9b052180c..fdd40fd80178c4c66b37e392d07a0a62f492f108 100644
> --- a/drivers/media/platform/qcom/iris/iris_platform_common.h
> +++ b/drivers/media/platform/qcom/iris/iris_platform_common.h
> @@ -156,6 +156,8 @@ struct iris_platform_data {
>  	unsigned int clk_tbl_size;
>  	const char * const *clk_rst_tbl;
>  	unsigned int clk_rst_tbl_size;
> +	const char * const *controller_rst_tbl;
> +	unsigned int controller_rst_tbl_size;
>  	u64 dma_mask;
>  	const char *fwname;
>  	u32 pas_id;
> diff --git a/drivers/media/platform/qcom/iris/iris_probe.c b/drivers/media/platform/qcom/iris/iris_probe.c
> index aca442dcc153830e6252d1dca87afb38c0b9eb8f..4f8bce6e2002bffee4c93dcaaf6e52bf4e40992e 100644
> --- a/drivers/media/platform/qcom/iris/iris_probe.c
> +++ b/drivers/media/platform/qcom/iris/iris_probe.c
> @@ -91,25 +91,40 @@ static int iris_init_clocks(struct iris_core *core)
>  	return 0;
>  }
>  
> -static int iris_init_resets(struct iris_core *core)
> +static int iris_init_reset_table(struct iris_core *core,
> +				 struct reset_control_bulk_data **resets,
> +				 const char * const *rst_tbl, u32 rst_tbl_size)
>  {
> -	const char * const *rst_tbl;
> -	u32 rst_tbl_size;
>  	u32 i = 0;
>  
> -	rst_tbl = core->iris_platform_data->clk_rst_tbl;
> -	rst_tbl_size = core->iris_platform_data->clk_rst_tbl_size;
> -
> -	core->resets = devm_kzalloc(core->dev,
> -				    sizeof(*core->resets) * rst_tbl_size,
> -				    GFP_KERNEL);
> -	if (!core->resets)
> +	*resets = devm_kzalloc(core->dev,
> +			       sizeof(struct reset_control_bulk_data) * rst_tbl_size,
> +			       GFP_KERNEL);
> +	if (!*resets)
>  		return -ENOMEM;
>  
>  	for (i = 0; i < rst_tbl_size; i++)
> -		core->resets[i].id = rst_tbl[i];
> +		(*resets)[i].id = rst_tbl[i];
> +
> +	return devm_reset_control_bulk_get_exclusive(core->dev, rst_tbl_size, *resets);
> +}
> +
> +static int iris_init_resets(struct iris_core *core)
> +{
> +	int ret;
> +
> +	ret = iris_init_reset_table(core, &core->resets,
> +				    core->iris_platform_data->clk_rst_tbl,
> +				    core->iris_platform_data->clk_rst_tbl_size);
> +	if (ret)
> +		return ret;
> +
> +	if (!core->iris_platform_data->controller_rst_tbl_size)
> +		return 0;
>  
> -	return devm_reset_control_bulk_get_exclusive(core->dev, rst_tbl_size, core->resets);
> +	return iris_init_reset_table(core, &core->controller_resets,
> +				     core->iris_platform_data->controller_rst_tbl,
> +				     core->iris_platform_data->controller_rst_tbl_size);
>  }
>  
>  static int iris_init_resources(struct iris_core *core)
> 
Reviewed-by: Dikshita Agarwal <quic_dikshita@...cinc.com>