linux-kernel - Re: [PATCH V3 7/7] drm/amd/pm: enable Wifi RFI mitigation feature support for SMU13.0.7

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Message-ID: <2bf4e20b-b206-6337-dcee-d8a13804db50@amd.com>
Date:   Sun, 18 Jun 2023 21:27:37 -0500
From:   Mario Limonciello <mario.limonciello@....com>
To:     Evan Quan <evan.quan@....com>, rafael@...nel.org, lenb@...nel.org,
        Alexander.Deucher@....com, Christian.Koenig@....com,
        Xinhui.Pan@....com, airlied@...il.com, daniel@...ll.ch,
        kvalo@...nel.org, nbd@....name, lorenzo@...nel.org,
        ryder.lee@...iatek.com, shayne.chen@...iatek.com,
        sean.wang@...iatek.com, matthias.bgg@...il.com,
        angelogioacchino.delregno@...labora.com, Lijo.Lazar@....com
Cc:     linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org,
        amd-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        linux-wireless@...r.kernel.org
Subject: Re: [PATCH V3 7/7] drm/amd/pm: enable Wifi RFI mitigation feature
 support for SMU13.0.7

On 6/16/23 01:57, Evan Quan wrote:
> Fulfill the SMU13.0.7 support for Wifi RFI mitigation feature.
> 
> Signed-off-by: Evan Quan <evan.quan@....com>
Reviewed-by: Mario Limonciello <mario.limonciello@....com>

> ---
>   .../drm/amd/pm/swsmu/smu13/smu_v13_0_7_ppt.c  | 59 +++++++++++++++++++
>   1 file changed, 59 insertions(+)
> 
> diff --git a/drivers/gpu/drm/amd/pm/swsmu/smu13/smu_v13_0_7_ppt.c b/drivers/gpu/drm/amd/pm/swsmu/smu13/smu_v13_0_7_ppt.c
> index 98a33f8ee209..16c1c04e2034 100644
> --- a/drivers/gpu/drm/amd/pm/swsmu/smu13/smu_v13_0_7_ppt.c
> +++ b/drivers/gpu/drm/amd/pm/swsmu/smu13/smu_v13_0_7_ppt.c
> @@ -125,6 +125,7 @@ static struct cmn2asic_msg_mapping smu_v13_0_7_message_map[SMU_MSG_MAX_COUNT] =
>   	MSG_MAP(ArmD3,				PPSMC_MSG_ArmD3,                       0),
>   	MSG_MAP(AllowGpo,			PPSMC_MSG_SetGpoAllow,           0),
>   	MSG_MAP(GetPptLimit,			PPSMC_MSG_GetPptLimit,                 0),
> +	MSG_MAP(EnableUCLKShadow,		PPSMC_MSG_EnableUCLKShadow,            0),
>   };
>   
>   static struct cmn2asic_mapping smu_v13_0_7_clk_map[SMU_CLK_COUNT] = {
> @@ -205,6 +206,7 @@ static struct cmn2asic_mapping smu_v13_0_7_table_map[SMU_TABLE_COUNT] = {
>   	TAB_MAP(DRIVER_SMU_CONFIG),
>   	TAB_MAP(ACTIVITY_MONITOR_COEFF),
>   	[SMU_TABLE_COMBO_PPTABLE] = {1, TABLE_COMBO_PPTABLE},
> +	TAB_MAP(WIFIBAND),
>   };
>   
>   static struct cmn2asic_mapping smu_v13_0_7_pwr_src_map[SMU_POWER_SOURCE_COUNT] = {
> @@ -487,6 +489,9 @@ static int smu_v13_0_7_tables_init(struct smu_context *smu)
>   	               AMDGPU_GEM_DOMAIN_VRAM);
>   	SMU_TABLE_INIT(tables, SMU_TABLE_COMBO_PPTABLE, MP0_MP1_DATA_REGION_SIZE_COMBOPPTABLE,
>   			PAGE_SIZE, AMDGPU_GEM_DOMAIN_VRAM);
> +	SMU_TABLE_INIT(tables, SMU_TABLE_WIFIBAND,
> +		       sizeof(WifiBandEntryTable_t), PAGE_SIZE,
> +		       AMDGPU_GEM_DOMAIN_VRAM);
>   
>   	smu_table->metrics_table = kzalloc(sizeof(SmuMetricsExternal_t), GFP_KERNEL);
>   	if (!smu_table->metrics_table)
> @@ -1721,6 +1726,57 @@ static int smu_v13_0_7_set_df_cstate(struct smu_context *smu,
>   					       NULL);
>   }
>   
> +static bool smu_v13_0_7_wbrf_support_check(struct smu_context *smu)
> +{
> +	return smu->smc_fw_version > 0x00524600;
> +}
> +
> +static int smu_v13_0_7_set_wbrf_exclusion_ranges(struct smu_context *smu,
> +						 struct exclusion_range *exclusion_ranges)
> +{
> +	WifiBandEntryTable_t wifi_bands;
> +	int valid_entries = 0;
> +	int ret, i;
> +
> +	memset(&wifi_bands, 0, sizeof(wifi_bands));
> +	for (i = 0; i < ARRAY_SIZE(wifi_bands.WifiBandEntry); i++) {
> +		if (!exclusion_ranges[i].start &&
> +		    !exclusion_ranges[i].end)
> +			break;
> +
> +		/* PMFW expects the inputs to be in Mhz unit */
> +		wifi_bands.WifiBandEntry[valid_entries].LowFreq =
> +			DIV_ROUND_DOWN_ULL(exclusion_ranges[i].start, HZ_IN_MHZ);
> +		wifi_bands.WifiBandEntry[valid_entries++].HighFreq =
> +			DIV_ROUND_UP_ULL(exclusion_ranges[i].end, HZ_IN_MHZ);
> +	}
> +	wifi_bands.WifiBandEntryNum = valid_entries;
> +
> +	/*
> +	 * Per confirm with PMFW team, WifiBandEntryNum = 0 is a valid setting.
> +	 * Considering the scenarios below:
> +	 * - At first the wifi device adds an exclusion range e.g. (2400,2500) to
> +	 *   BIOS and our driver gets notified. We will set WifiBandEntryNum = 1
> +	 *   and pass the WifiBandEntry (2400, 2500) to PMFW.
> +	 *
> +	 * - Later the wifi device removes the wifiband list added above and
> +	 *   our driver gets notified again. At this time, driver will set
> +	 *   WifiBandEntryNum = 0 and pass an empty WifiBandEntry list to PMFW.
> +	 *   - PMFW may still need to do some uclk shadow update(e.g. switching
> +	 *     from shadow clock back to primary clock) on receiving this.
> +	 */
> +
> +	ret = smu_cmn_update_table(smu,
> +				   SMU_TABLE_WIFIBAND,
> +				   0,
> +				   (void *)(&wifi_bands),
> +				   true);
> +	if (ret)
> +		dev_err(smu->adev->dev, "Failed to set wifiband!");
> +
> +	return ret;
> +}
> +
>   static const struct pptable_funcs smu_v13_0_7_ppt_funcs = {
>   	.get_allowed_feature_mask = smu_v13_0_7_get_allowed_feature_mask,
>   	.set_default_dpm_table = smu_v13_0_7_set_default_dpm_table,
> @@ -1786,6 +1842,9 @@ static const struct pptable_funcs smu_v13_0_7_ppt_funcs = {
>   	.set_mp1_state = smu_v13_0_7_set_mp1_state,
>   	.set_df_cstate = smu_v13_0_7_set_df_cstate,
>   	.gpo_control = smu_v13_0_gpo_control,
> +	.is_asic_wbrf_supported = smu_v13_0_7_wbrf_support_check,
> +	.enable_uclk_shadow = smu_v13_0_enable_uclk_shadow,
> +	.set_wbrf_exclusion_ranges = smu_v13_0_7_set_wbrf_exclusion_ranges,
>   };
>   
>   void smu_v13_0_7_set_ppt_funcs(struct smu_context *smu)