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Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.96 #2 (Red Hat Linux)) id 1qsfRu-00BgAT-1z; Tue, 17 Oct 2023 08:29:10 +0000 Received: from sin.source.kernel.org ([2604:1380:40e1:4800::1]) by bombadil.infradead.org with esmtps (Exim 4.96 #2 (Red Hat Linux)) id 1qsfRq-00Bg85-1Y; Tue, 17 Oct 2023 08:29:08 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by sin.source.kernel.org (Postfix) with ESMTP id 2082ACE1D6B; Tue, 17 Oct 2023 08:29:04 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 74F6CC433C8; Tue, 17 Oct 2023 08:28:59 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1697531343; bh=RESuwpGBnAb12MK/MNuF3dBypxSNz2pAixUEdbu0A0E=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=jrQQ05qC6teSXhyYJm0Ss3ngnUZJG82JYLoNCYwxd7Qm4BpNnxAVY6tuh2teCUuD0 eUAiXCPii9O5P59rcy//pEOxE+TOb/jpYwsQ/lEcxXZllZVDw1/jCdRXIt3b6rd0vN EE9UxXzs8ePVIdtwiOsXOCMTRcWfL6419MGz2MKul4FFqf5qqFKX94aYeE4O5dV0HI WCB1Y8kOt0Sri4PkagJzGQ99EMiw8nL868/MMqiYgByycWSV1kEeDmq03GpZ0EGZ9Q fwEMb5cFS3e3GBdvocOmxoKOPYdA1wF5FygdYPnaqdEw/zBH7YXzQEZOQuxMiUikn2 RiSG6Z5zIhU3w== Message-ID: <3d2b2683-3b7f-403c-a717-9c5e3f2c3939@kernel.org> Date: Tue, 17 Oct 2023 17:28:57 +0900 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v7 07/26] PM / devfreq: rockchip-dfi: introduce channel mask To: Sascha Hauer Cc: linux-rockchip@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org, Heiko Stuebner , Kyungmin Park , MyungJoo Ham , Will Deacon , Mark Rutland , kernel@pengutronix.de, Michael Riesch , Robin Murphy , Vincent Legoll , Rob Herring , Krzysztof Kozlowski , Conor Dooley , devicetree@vger.kernel.org, Sebastian Reichel References: <20230704093242.583575-1-s.hauer@pengutronix.de> <20230704093242.583575-8-s.hauer@pengutronix.de> <859b0091-e361-6060-2977-4aba13af418a@kernel.org> <20231016112216.GY3359458@pengutronix.de> <20231016124558.GL235829@pengutronix.de> From: Chanwoo Choi Content-Language: en-US In-Reply-To: <20231016124558.GL235829@pengutronix.de> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20231017_012906_883808_7A2984D8 X-CRM114-Status: GOOD ( 19.90 ) X-BeenThere: linux-rockchip@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: Upstream kernel work for Rockchip platforms List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "Linux-rockchip" Errors-To: linux-rockchip-bounces+linux-rockchip=archiver.kernel.org@lists.infradead.org On 23. 10. 16. 21:45, Sascha Hauer wrote: > On Mon, Oct 16, 2023 at 01:22:16PM +0200, Sascha Hauer wrote: >> On Sat, Oct 07, 2023 at 02:21:10AM +0900, Chanwoo Choi wrote: >>> Hi, >>> >>> On 23. 7. 4. 18:32, Sascha Hauer wrote: >>>> Different Rockchip SoC variants have a different number of channels. >>>> Introduce a channel mask to make the number of channels configurable >>>> from SoC initialization code. >>>> >>>> Reviewed-by: Sebastian Reichel >>>> Signed-off-by: Sascha Hauer >>>> --- >>>> drivers/devfreq/event/rockchip-dfi.c | 23 +++++++++++++++++------ >>>> 1 file changed, 17 insertions(+), 6 deletions(-) >>>> >>>> diff --git a/drivers/devfreq/event/rockchip-dfi.c b/drivers/devfreq/event/rockchip-dfi.c >>>> index 126bb744645b6..82de24a027579 100644 >>>> --- a/drivers/devfreq/event/rockchip-dfi.c >>>> +++ b/drivers/devfreq/event/rockchip-dfi.c >>>> @@ -18,10 +18,11 @@ >>>> #include >>>> #include >>>> #include >>>> +#include >>>> >>>> #include >>>> >>>> -#define RK3399_DMC_NUM_CH 2 >>>> +#define DMC_MAX_CHANNELS 2 >>>> >>>> /* DDRMON_CTRL */ >>>> #define DDRMON_CTRL 0x04 >>>> @@ -44,7 +45,7 @@ struct dmc_count_channel { >>>> }; >>>> >>>> struct dmc_count { >>>> - struct dmc_count_channel c[RK3399_DMC_NUM_CH]; >>>> + struct dmc_count_channel c[DMC_MAX_CHANNELS]; >>>> }; >>>> >>>> /* >>>> @@ -61,6 +62,7 @@ struct rockchip_dfi { >>>> struct regmap *regmap_pmu; >>>> struct clk *clk; >>>> u32 ddr_type; >>>> + unsigned int channel_mask; >>>> }; >>>> >>>> static void rockchip_dfi_start_hardware_counter(struct devfreq_event_dev *edev) >>>> @@ -95,7 +97,9 @@ static void rockchip_dfi_read_counters(struct devfreq_event_dev *edev, struct dm >>>> u32 i; >>>> void __iomem *dfi_regs = dfi->regs; >>>> >>>> - for (i = 0; i < RK3399_DMC_NUM_CH; i++) { >>>> + for (i = 0; i < DMC_MAX_CHANNELS; i++) { >>>> + if (!(dfi->channel_mask & BIT(i))) >>>> + continue; >>>> count->c[i].access = readl_relaxed(dfi_regs + >>>> DDRMON_CH0_DFI_ACCESS_NUM + i * 20); >>>> count->c[i].total = readl_relaxed(dfi_regs + >>>> @@ -145,9 +149,14 @@ static int rockchip_dfi_get_event(struct devfreq_event_dev *edev, >>>> rockchip_dfi_read_counters(edev, &count); >>>> >>>> /* We can only report one channel, so find the busiest one */ >>>> - for (i = 0; i < RK3399_DMC_NUM_CH; i++) { >>>> - u32 a = count.c[i].access - last->c[i].access; >>>> - u32 t = count.c[i].total - last->c[i].total; >>>> + for (i = 0; i < DMC_MAX_CHANNELS; i++) { >>> >>> Instead of DMC_MAX_CHANNELS defintion, >>> you can initialize the max channel in each rkXXXX_dfi_init() like 'dfi->channel_count'. >>> It reduces the unnecessary loop by initializing the proper max channel. >> >> That is not easily possible. Some SoCs, eg the RK3588 have four >> channels, but not all channels are necessarily enabled it also >> might not be the first channels that are enabled. On a RK3588 >> the channel mask might for example be 0b0101. > > Nah, forget this comment. Of course I can initialize a variable with a > maximum value of channels that could be available on this SoC and only > iterate over these. Will do. > Thanks. -- Best Regards, Samsung Electronics Chanwoo Choi _______________________________________________ Linux-rockchip mailing list Linux-rockchip@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-rockchip