linux-kernel - Re: [PATCH] interconnect: qcom: qcs404: Remove gpu and display nodes

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Date:   Tue, 17 Nov 2020 15:16:56 -0800
From:   Mike Tipton <mdtipton@...eaurora.org>
To:     Georgi Djakov <georgi.djakov@...aro.org>, linux-pm@...r.kernel.org,
        bjorn.andersson@...aro.org
Cc:     linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] interconnect: qcom: qcs404: Remove gpu and display nodes

On 11/11/2020 2:07 AM, Georgi Djakov wrote:
> The following errors are noticed during boot on a QCS404 board:
> [    2.926647] qcom_icc_rpm_smd_send mas 6 error -6
> [    2.934573] qcom_icc_rpm_smd_send mas 8 error -6
> 
> These errors show when we try to configure the GPU and display nodes,
> which are defined in the topology, but these hardware blocks actually
> do not exist on QCS404. According to the datasheet, GPU and display
> are only present on QCS405 and QCS407.

Even on QCS405/407 where GPU and display are present, you'd still get 
these errors since these particular nodes aren't supported on RPM and 
are purely local. Instead of removing these we should just change their 
mas_rpm_id to -1. It's harmless to leave them in for QCS404 since 
they're only used for path aggregation. The same code can support all 
variants of the QCS400 series. We just wouldn't expect anyone to 
actually vote these paths on QCS404. Similar to how the gcc-qcs404 clock 
provider still registers the GPU and MDP clocks.

> 
> Signed-off-by: Georgi Djakov <georgi.djakov@...aro.org>
> ---
>   drivers/interconnect/qcom/qcs404.c | 9 +++------
>   1 file changed, 3 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/interconnect/qcom/qcs404.c b/drivers/interconnect/qcom/qcs404.c
> index 9f992422e92f..2ed544e23ff3 100644
> --- a/drivers/interconnect/qcom/qcs404.c
> +++ b/drivers/interconnect/qcom/qcs404.c
> @@ -20,8 +20,6 @@
>   
>   enum {
>   	QCS404_MASTER_AMPSS_M0 = 1,
> -	QCS404_MASTER_GRAPHICS_3D,
> -	QCS404_MASTER_MDP_PORT0,
>   	QCS404_SNOC_BIMC_1_MAS,
>   	QCS404_MASTER_TCU_0,
>   	QCS404_MASTER_SPDM,
> @@ -156,8 +154,6 @@ struct qcom_icc_desc {
>   	}
>   
>   DEFINE_QNODE(mas_apps_proc, QCS404_MASTER_AMPSS_M0, 8, 0, -1, QCS404_SLAVE_EBI_CH0, QCS404_BIMC_SNOC_SLV);
> -DEFINE_QNODE(mas_oxili, QCS404_MASTER_GRAPHICS_3D, 8, 6, -1, QCS404_SLAVE_EBI_CH0, QCS404_BIMC_SNOC_SLV);
> -DEFINE_QNODE(mas_mdp, QCS404_MASTER_MDP_PORT0, 8, 8, -1, QCS404_SLAVE_EBI_CH0, QCS404_BIMC_SNOC_SLV >   DEFINE_QNODE(mas_snoc_bimc_1, QCS404_SNOC_BIMC_1_MAS, 8, 76, -1, 
QCS404_SLAVE_EBI_CH0);
>   DEFINE_QNODE(mas_tcu_0, QCS404_MASTER_TCU_0, 8, -1, -1, QCS404_SLAVE_EBI_CH0, QCS404_BIMC_SNOC_SLV);
>   DEFINE_QNODE(mas_spdm, QCS404_MASTER_SPDM, 4, -1, -1, QCS404_PNOC_INT_3);
> @@ -231,8 +227,6 @@ DEFINE_QNODE(slv_lpass, QCS404_SLAVE_LPASS, 4, -1, -1, 0);
>   
>   static struct qcom_icc_node *qcs404_bimc_nodes[] = {
>   	[MASTER_AMPSS_M0] = &mas_apps_proc,
> -	[MASTER_OXILI] = &mas_oxili,
> -	[MASTER_MDP_PORT0] = &mas_mdp,
>   	[MASTER_SNOC_BIMC_1] = &mas_snoc_bimc_1,
>   	[MASTER_TCU_0] = &mas_tcu_0,
>   	[SLAVE_EBI_CH0] = &slv_ebi,
> @@ -460,6 +454,9 @@ static int qnoc_probe(struct platform_device *pdev)
>   	for (i = 0; i < num_nodes; i++) {
>   		size_t j;
>   
> +		if (!qnodes[i])
> +			continue;
> +
>   		node = icc_node_create(qnodes[i]->id);
>   		if (IS_ERR(node)) {
>   			ret = PTR_ERR(node);
>