RE: [PATCH v8 07/26] PM / devfreq: rockchip-dfi: introduce channel mask

["Chanwoo Choi" <cw00.choi@samsung.com>]

> -----Original Message-----
> From: Chanwoo Choi <chanwoo@kernel.org>
> Sent: Thursday, October 19, 2023 12:06 AM
> To: Sascha Hauer <s.hauer@pengutronix.de>; linux-
> rockchip@lists.infradead.org
> Cc: linux-arm-kernel@lists.infradead.org; linux-kernel@vger.kernel.org;
> linux-pm@vger.kernel.org; Heiko Stuebner <heiko@sntech.de>; Kyungmin Park
> <kyungmin.park@samsung.com>; MyungJoo Ham <myungjoo.ham@samsung.com>; Will
> Deacon <will@kernel.org>; Mark Rutland <mark.rutland@arm.com>;
> kernel@pengutronix.de; Michael Riesch <michael.riesch@wolfvision.net>;
> Robin Murphy <robin.murphy@arm.com>; Vincent Legoll
> <vincent.legoll@gmail.com>; Rob Herring <robh+dt@kernel.org>; Krzysztof
> Kozlowski <krzysztof.kozlowski+dt@linaro.org>; Conor Dooley
> <conor+dt@kernel.org>; devicetree@vger.kernel.org; Sebastian Reichel
> <sebastian.reichel@collabora.com>
> Subject: Re: [PATCH v8 07/26] PM / devfreq: rockchip-dfi: introduce
> channel mask
> 
> On 23. 10. 18. 15:16, 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 <sebastian.reichel@collabora.com>
> > Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
> > ---
> >
> > Notes:
> >     Changes since v7:
> >      - Loop only over channels present on a SoC
> >
> >  drivers/devfreq/event/rockchip-dfi.c | 25 +++++++++++++++++++------
> >  1 file changed, 19 insertions(+), 6 deletions(-)
> >
> > diff --git a/drivers/devfreq/event/rockchip-dfi.c
> > b/drivers/devfreq/event/rockchip-dfi.c
> > index 126bb744645b6..28c18bbf6baa5 100644
> > --- a/drivers/devfreq/event/rockchip-dfi.c
> > +++ b/drivers/devfreq/event/rockchip-dfi.c
> > @@ -18,10 +18,11 @@
> >  #include <linux/list.h>
> >  #include <linux/of.h>
> >  #include <linux/of_device.h>
> > +#include <linux/bits.h>
> >
> >  #include <soc/rockchip/rk3399_grf.h>
> >
> > -#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 +62,8 @@ struct rockchip_dfi {
> >  	struct regmap *regmap_pmu;
> >  	struct clk *clk;
> >  	u32 ddr_type;
> > +	unsigned int channel_mask;
> > +	unsigned int max_channels;
> >  };
> >
> >  static void rockchip_dfi_start_hardware_counter(struct
> > devfreq_event_dev *edev) @@ -95,7 +98,9 @@ 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 < dfi->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
> +150,14 @@
> > 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 < dfi->max_channels; i++) {
> > +		u32 a, t;
> > +
> > +		if (!(dfi->channel_mask & BIT(i)))
> > +			continue;
> > +
> > +		a = count.c[i].access - last->c[i].access;
> > +		t = count.c[i].total - last->c[i].total;
> >
> >  		if (a > access) {
> >  			access = a;
> > @@ -185,6 +195,9 @@ static int rk3399_dfi_init(struct rockchip_dfi *dfi)
> >  	dfi->ddr_type = (val >> RK3399_PMUGRF_DDRTYPE_SHIFT) &
> >  			RK3399_PMUGRF_DDRTYPE_MASK;
> >
> > +	dfi->channel_mask = GENMASK(1, 0);
> > +	dfi->max_channels = 2;
> > +
> >  	return 0;
> >  };
> >
> 
> Acked-by: Chanwoo Choi <cw00.choi@samsung.com>
> 


Applied it. Thanks.

Best Regards,
Chanwoo Choi