linux-kernel - Re: [PATCH v2 2/3] net: stmmac: Add interconnect support

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Message-ID: <cf6c2526-ba12-4627-b4e9-20ce5b4d175c@quicinc.com>
Date: Wed, 26 Jun 2024 16:38:34 -0700
From: Sagar Cheluvegowda <quic_scheluve@...cinc.com>
To: Andrew Halaney <ahalaney@...hat.com>
CC: Vinod Koul <vkoul@...nel.org>,
        Alexandre Torgue
	<alexandre.torgue@...s.st.com>,
        Jose Abreu <joabreu@...opsys.com>,
        "David S.
 Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        "Jakub
 Kicinski" <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
        Maxime Coquelin
	<mcoquelin.stm32@...il.com>,
        Russell King <linux@...linux.org.uk>, "Rob
 Herring" <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        "Conor
 Dooley" <conor+dt@...nel.org>,
        Bhupesh Sharma <bhupesh.sharma@...aro.org>, <kernel@...cinc.com>,
        Andrew Lunn <andrew@...n.ch>, <linux-arm-msm@...r.kernel.org>,
        <netdev@...r.kernel.org>, <linux-stm32@...md-mailman.stormreply.com>,
        <linux-arm-kernel@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
        <devicetree@...r.kernel.org>
Subject: Re: [PATCH v2 2/3] net: stmmac: Add interconnect support



On 6/26/2024 7:54 AM, Andrew Halaney wrote:
> On Tue, Jun 25, 2024 at 04:49:29PM GMT, Sagar Cheluvegowda wrote:
>> Add interconnect support to vote for bus bandwidth based
>> on the current speed of the driver.This change adds support
>> for two different paths - one from ethernet to DDR and the
>> other from Apps to ethernet.
> 
> "APPS" is a qualcomm term, since you're trying to go the generic route
> here maybe just say CPU to ethernet?
> 
I can update this in my next patch.

Sagar
>> Vote from each interconnect client is aggregated and the on-chip
>> interconnect hardware is configured to the most appropriate
>> bandwidth profile.
>>
>> Suggested-by: Andrew Halaney <ahalaney@...hat.com>
>> Signed-off-by: Sagar Cheluvegowda <quic_scheluve@...cinc.com>
>> ---
>>  drivers/net/ethernet/stmicro/stmmac/stmmac.h          |  1 +
>>  drivers/net/ethernet/stmicro/stmmac/stmmac_main.c     |  8 ++++++++
>>  drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c | 12 ++++++++++++
>>  include/linux/stmmac.h                                |  2 ++
>>  4 files changed, 23 insertions(+)
>>
>> diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac.h b/drivers/net/ethernet/stmicro/stmmac/stmmac.h
>> index b23b920eedb1..56a282d2b8cd 100644
>> --- a/drivers/net/ethernet/stmicro/stmmac/stmmac.h
>> +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac.h
>> @@ -21,6 +21,7 @@
>>  #include <linux/ptp_clock_kernel.h>
>>  #include <linux/net_tstamp.h>
>>  #include <linux/reset.h>
>> +#include <linux/interconnect.h>
>>  #include <net/page_pool/types.h>
>>  #include <net/xdp.h>
>>  #include <uapi/linux/bpf.h>
>> diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
>> index b3afc7cb7d72..ec7c61ee44d4 100644
>> --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
>> +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
>> @@ -985,6 +985,12 @@ static void stmmac_fpe_link_state_handle(struct stmmac_priv *priv, bool is_up)
>>  	}
>>  }
>>  
>> +static void stmmac_set_icc_bw(struct stmmac_priv *priv, unsigned int speed)
>> +{
>> +	icc_set_bw(priv->plat->axi_icc_path, Mbps_to_icc(speed), Mbps_to_icc(speed));
>> +	icc_set_bw(priv->plat->ahb_icc_path, Mbps_to_icc(speed), Mbps_to_icc(speed));
>> +}
>> +
>>  static void stmmac_mac_link_down(struct phylink_config *config,
>>  				 unsigned int mode, phy_interface_t interface)
>>  {
>> @@ -1080,6 +1086,8 @@ static void stmmac_mac_link_up(struct phylink_config *config,
>>  	if (priv->plat->fix_mac_speed)
>>  		priv->plat->fix_mac_speed(priv->plat->bsp_priv, speed, mode);
>>  
>> +	stmmac_set_icc_bw(priv, speed);
>> +
>>  	if (!duplex)
>>  		ctrl &= ~priv->hw->link.duplex;
>>  	else
>> diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
>> index 54797edc9b38..e46c94b643a3 100644
>> --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
>> +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
>> @@ -642,6 +642,18 @@ stmmac_probe_config_dt(struct platform_device *pdev, u8 *mac)
>>  		dev_dbg(&pdev->dev, "PTP rate %d\n", plat->clk_ptp_rate);
>>  	}
>>  
>> +	plat->axi_icc_path = devm_of_icc_get(&pdev->dev, "axi");
>> +	if (IS_ERR(plat->axi_icc_path)) {
>> +		ret = (void *)plat->axi_icc_path;
>> +		goto error_hw_init;
>> +	}
>> +
>> +	plat->ahb_icc_path = devm_of_icc_get(&pdev->dev, "ahb");
>> +	if (IS_ERR(plat->ahb_icc_path)) {
>> +		ret = (void *)plat->ahb_icc_path;
>> +		goto error_hw_init;
>> +	}
>> +
>>  	plat->stmmac_rst = devm_reset_control_get_optional(&pdev->dev,
>>  							   STMMAC_RESOURCE_NAME);
>>  	if (IS_ERR(plat->stmmac_rst)) {
>> diff --git a/include/linux/stmmac.h b/include/linux/stmmac.h
>> index f92c195c76ed..385f352a0c23 100644
>> --- a/include/linux/stmmac.h
>> +++ b/include/linux/stmmac.h
>> @@ -283,6 +283,8 @@ struct plat_stmmacenet_data {
>>  	struct reset_control *stmmac_rst;
>>  	struct reset_control *stmmac_ahb_rst;
>>  	struct stmmac_axi *axi;
>> +	struct icc_path *axi_icc_path;
>> +	struct icc_path *ahb_icc_path;
>>  	int has_gmac4;
>>  	int rss_en;
>>  	int mac_port_sel_speed;
>>
>> -- 
>> 2.34.1
>>
>