linux-kernel - Re: [PATCH 04/11] media: iris: don't specify min_acc

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Message-ID: <d8f6969f-a58c-4a02-a59d-f608e1a95ba7@kernel.org>
Date: Sun, 11 Jan 2026 21:06:52 +0000
From: Bryan O'Donoghue <bod@...nel.org>
To: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>,
 Bjorn Andersson <andersson@...nel.org>,
 Konrad Dybcio <konradybcio@...nel.org>,
 Rob Clark <robin.clark@....qualcomm.com>, Dmitry Baryshkov
 <lumag@...nel.org>, Abhinav Kumar <abhinav.kumar@...ux.dev>,
 Jessica Zhang <jesszhan0024@...il.com>, Sean Paul <sean@...rly.run>,
 Marijn Suijten <marijn.suijten@...ainline.org>,
 David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
 Akhil P Oommen <akhilpo@....qualcomm.com>,
 Vikash Garodia <vikash.garodia@....qualcomm.com>,
 Dikshita Agarwal <dikshita.agarwal@....qualcomm.com>,
 Mauro Carvalho Chehab <mchehab@...nel.org>
Cc: Konrad Dybcio <konrad.dybcio@....qualcomm.com>,
 linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
 dri-devel@...ts.freedesktop.org, freedreno@...ts.freedesktop.org,
 linux-media@...r.kernel.org
Subject: Re: [PATCH 04/11] media: iris: don't specify min_acc_length in the
 source code

On 10/01/2026 19:37, Dmitry Baryshkov wrote:
> The min_acc length can be calculated from the platform UBWC
> configuration. Use the freshly introduced helper and calculate min_acc
> length based on the platform UBWC configuration instead of specifying it
> directly in the source.
> 
> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
> ---
>   drivers/media/platform/qcom/iris/iris_hfi_gen2_packet.c | 5 ++++-
>   drivers/media/platform/qcom/iris/iris_platform_common.h | 1 -
>   drivers/media/platform/qcom/iris/iris_platform_gen2.c   | 1 -
>   3 files changed, 4 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/media/platform/qcom/iris/iris_hfi_gen2_packet.c b/drivers/media/platform/qcom/iris/iris_hfi_gen2_packet.c
> index d77fa29f44fc..878e61aa77c3 100644
> --- a/drivers/media/platform/qcom/iris/iris_hfi_gen2_packet.c
> +++ b/drivers/media/platform/qcom/iris/iris_hfi_gen2_packet.c
> @@ -3,6 +3,8 @@
>    * Copyright (c) 2022-2024 Qualcomm Innovation Center, Inc. All rights reserved.
>    */
> 
> +#include <linux/soc/qcom/ubwc.h>
> +
>   #include "iris_hfi_common.h"
>   #include "iris_hfi_gen2.h"
>   #include "iris_hfi_gen2_packet.h"
> @@ -120,6 +122,7 @@ static void iris_hfi_gen2_create_packet(struct iris_hfi_header *hdr, u32 pkt_typ
> 
>   void iris_hfi_gen2_packet_sys_init(struct iris_core *core, struct iris_hfi_header *hdr)
>   {
> +	const struct qcom_ubwc_cfg_data *ubwc = core->ubwc_cfg;
>   	u32 payload = 0;
> 
>   	iris_hfi_gen2_create_header(hdr, 0, core->header_id++);
> @@ -146,7 +149,7 @@ void iris_hfi_gen2_packet_sys_init(struct iris_core *core, struct iris_hfi_heade
>   				    &payload,
>   				    sizeof(u32));
> 
> -	payload = core->iris_platform_data->ubwc_config->mal_length;
> +	payload = qcom_ubwc_min_acc_length_64b(ubwc) ? 64 : 32;
>   	iris_hfi_gen2_create_packet(hdr,
>   				    HFI_PROP_UBWC_MAL_LENGTH,
>   				    HFI_HOST_FLAGS_NONE,
> diff --git a/drivers/media/platform/qcom/iris/iris_platform_common.h b/drivers/media/platform/qcom/iris/iris_platform_common.h
> index 8d8cdb56a3c7..3c5f3f68b722 100644
> --- a/drivers/media/platform/qcom/iris/iris_platform_common.h
> +++ b/drivers/media/platform/qcom/iris/iris_platform_common.h
> @@ -73,7 +73,6 @@ struct tz_cp_config {
> 
>   struct ubwc_config_data {
>   	u32	max_channels;
> -	u32	mal_length;
>   	u32	highest_bank_bit;
>   	u32	bank_swzl_level;
>   	u32	bank_swz2_level;
> diff --git a/drivers/media/platform/qcom/iris/iris_platform_gen2.c b/drivers/media/platform/qcom/iris/iris_platform_gen2.c
> index c1989240c248..c70cfc2fc553 100644
> --- a/drivers/media/platform/qcom/iris/iris_platform_gen2.c
> +++ b/drivers/media/platform/qcom/iris/iris_platform_gen2.c
> @@ -633,7 +633,6 @@ static const struct platform_clk_data sm8550_clk_table[] = {
> 
>   static struct ubwc_config_data ubwc_config_sm8550 = {
>   	.max_channels = 8,
> -	.mal_length = 32,
>   	.highest_bank_bit = 16,
>   	.bank_swzl_level = 0,
>   	.bank_swz2_level = 1,
> 
> --
> 2.47.3
> 
> 

This code is fine but, I still suggest changing the 64b postfix in 
qcom_ubwc_min_acc_length_64b and just having the function return the 
size for the platform as _that_ is the more sustainable way.

Up to you.

Reviewed-by: Bryan O'Donoghue <bryan.odonoghue@...aro.org>

---
bod