linux-kernel - Re: [PATCH 4.19 184/191] drm/amdgpu/smu10: fix smu10_get_clock_by_type_with

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Date:   Tue, 25 Feb 2020 12:42:34 +0100
From:   Pavel Machek <pavel@...x.de>
To:     pavel@...x.de
Cc:     linux-kernel@...r.kernel.org, Evan Quan <evan.quan@....com>,
        Alex Deucher <alexander.deucher@....com>,
        Sasha Levin <sashal@...nel.org>
Subject: Re: [PATCH 4.19 184/191] drm/amdgpu/smu10: fix
 smu10_get_clock_by_type_with_latency

Hi!

> From: Alex Deucher <alexander.deucher@....com>
> 
> [ Upstream commit 4d0a72b66065dd7e274bad6aa450196d42fd8f84 ]
> 
> Only send non-0 clocks to DC for validation.  This mirrors
> what the windows driver does.

> diff --git a/drivers/gpu/drm/amd/powerplay/hwmgr/smu10_hwmgr.c b/drivers/gpu/drm/amd/powerplay/hwmgr/smu10_hwmgr.c
> index 1546bc49004f8..3fa6e8123b8eb 100644
> --- a/drivers/gpu/drm/amd/powerplay/hwmgr/smu10_hwmgr.c
> +++ b/drivers/gpu/drm/amd/powerplay/hwmgr/smu10_hwmgr.c
> @@ -994,12 +994,15 @@ static int smu10_get_clock_by_type_with_latency(struct pp_hwmgr *hwmgr,
>  
>  	clocks->num_levels = 0;
>  	for (i = 0; i < pclk_vol_table->count; i++) {
> -		clocks->data[i].clocks_in_khz = pclk_vol_table->entries[i].clk * 10;
> -		clocks->data[i].latency_in_us = latency_required ?
> -						smu10_get_mem_latency(hwmgr,
> -						pclk_vol_table->entries[i].clk) :
> -						0;
> -		clocks->num_levels++;
> +		if (pclk_vol_table->entries[i].clk) {
> +			clocks->data[clocks->num_levels].clocks_in_khz =
> +				pclk_vol_table->entries[i].clk * 10;
> +			clocks->data[clocks->num_levels].latency_in_us = latency_required ?
> +				smu10_get_mem_latency(hwmgr,
> +						      pclk_vol_table->entries[i].clk) :
> +				0;
> +			clocks->num_levels++;
> +		}
>  	}

This results in very ugly wrapping. Better way would be to do
"if !(pclk_vol_table->entries[i].clk) continue;"...

"drm/amdgpu/smu10: fix smu10_get_clock_by_type_with_voltage" could be
improved in similar way.

Best regards,
							Pavel

-- 
DENX Software Engineering GmbH,      Managing Director: Wolfgang Denk
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany

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