linux-kernel - Re: [PATCH v1 10/10] drm/panthor: Add support for Mali-G1 GPUs

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Message-ID: <8f4c42d3-b0e9-4786-a14e-70045ec66489@arm.com>
Date: Mon, 20 Oct 2025 14:18:02 +0100
From: Steven Price <steven.price@....com>
To: Karunika Choo <karunika.choo@....com>, dri-devel@...ts.freedesktop.org
Cc: nd@....com, Boris Brezillon <boris.brezillon@...labora.com>,
 Liviu Dudau <liviu.dudau@....com>,
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
 Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>,
 David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 10/10] drm/panthor: Add support for Mali-G1 GPUs

On 14/10/2025 10:43, Karunika Choo wrote:
> Add support for Mali-G1 GPUs (CSF architecture v14), introducing a new
> panthor_hw_arch_v14 entry with reset and L2 power management operations
> via the PWR_CONTROL block.
> 
> Mali-G1 introduces a dedicated PWR_CONTROL block for managing resets and
> power domains. panthor_gpu_info_init() is updated to use this block for
> L2, tiler, and shader domain present register reads.
> 
> Signed-off-by: Karunika Choo <karunika.choo@....com>
> ---
>  drivers/gpu/drm/panthor/panthor_fw.c |  1 +
>  drivers/gpu/drm/panthor/panthor_hw.c | 30 ++++++++++++++++++++++++++++
>  2 files changed, 31 insertions(+)
> 
> diff --git a/drivers/gpu/drm/panthor/panthor_fw.c b/drivers/gpu/drm/panthor/panthor_fw.c
> index c1b2fba311d8..dd5ffbea8cd8 100644
> --- a/drivers/gpu/drm/panthor/panthor_fw.c
> +++ b/drivers/gpu/drm/panthor/panthor_fw.c
> @@ -1493,3 +1493,4 @@ MODULE_FIRMWARE("arm/mali/arch10.12/mali_csffw.bin");
>  MODULE_FIRMWARE("arm/mali/arch11.8/mali_csffw.bin");
>  MODULE_FIRMWARE("arm/mali/arch12.8/mali_csffw.bin");
>  MODULE_FIRMWARE("arm/mali/arch13.8/mali_csffw.bin");
> +MODULE_FIRMWARE("arm/mali/arch14.8/mali_csffw.bin");
> diff --git a/drivers/gpu/drm/panthor/panthor_hw.c b/drivers/gpu/drm/panthor/panthor_hw.c
> index 77fd2c56e69f..7a47414d246e 100644
> --- a/drivers/gpu/drm/panthor/panthor_hw.c
> +++ b/drivers/gpu/drm/panthor/panthor_hw.c
> @@ -4,6 +4,7 @@
>  #include "panthor_device.h"
>  #include "panthor_gpu.h"
>  #include "panthor_hw.h"
> +#include "panthor_pwr.h"
>  #include "panthor_regs.h"
>  
>  #define GPU_PROD_ID_MAKE(arch_major, prod_major) \
> @@ -29,12 +30,28 @@ static struct panthor_hw panthor_hw_arch_v10 = {
>  	},
>  };
>  
> +static struct panthor_hw panthor_hw_arch_v14 = {
> +	.features = {
> +		BIT(PANTHOR_HW_FEATURE_PWR_CONTROL)
> +	},
> +	.ops = {
> +		.soft_reset = panthor_pwr_reset_soft,
> +		.l2_power_off = panthor_pwr_l2_power_off,
> +		.l2_power_on = panthor_pwr_l2_power_on,
> +	},
> +};
> +
>  static struct panthor_hw_entry panthor_hw_match[] = {
>  	{
>  		.arch_min = 10,
>  		.arch_max = 13,
>  		.hwdev = &panthor_hw_arch_v10,
>  	},
> +	{
> +		.arch_min = 14,
> +		.arch_max = 14,
> +		.hwdev = &panthor_hw_arch_v14,
> +	},
>  };
>  
>  static char *get_gpu_model_name(struct panthor_device *ptdev)
> @@ -82,6 +99,12 @@ static char *get_gpu_model_name(struct panthor_device *ptdev)
>  		fallthrough;
>  	case GPU_PROD_ID_MAKE(13, 1):
>  		return "Mali-G625";
> +	case GPU_PROD_ID_MAKE(14, 0):
> +		return "Mali-G1-Ultra";
> +	case GPU_PROD_ID_MAKE(14, 1):
> +		return "Mali-G1-Premium";
> +	case GPU_PROD_ID_MAKE(14, 3):
> +		return "Mali-G1-Pro";
>  	}
>  
>  	return "(Unknown Mali GPU)";
> @@ -114,6 +137,13 @@ static void panthor_gpu_info_init(struct panthor_device *ptdev)
>  
>  	/* Introduced in arch 11.x */
>  	ptdev->gpu_info.gpu_features = gpu_read64(ptdev, GPU_FEATURES);
> +
> +	/* Introduced in arch 14.x */
> +	if (panthor_hw_has_feature(ptdev, PANTHOR_HW_FEATURE_PWR_CONTROL)) {
> +		ptdev->gpu_info.l2_present = gpu_read64(ptdev, PWR_L2_PRESENT);
> +		ptdev->gpu_info.tiler_present = gpu_read64(ptdev, PWR_TILER_PRESENT);
> +		ptdev->gpu_info.shader_present = gpu_read64(ptdev, PWR_SHADER_PRESENT);
> +	}

This should be instead of reading the GPU_SHADER_PRESENT etc registers.
At the moment we're reading a bunch of registers which are reserved on
the new GPUs, only to replace the values here.

Thanks,
Steve

>  }
>  
>  static void panthor_hw_info_init(struct panthor_device *ptdev)