linux-kernel - Re: [RFC PATCH v3 7/7] drm: exynos: mixer: Add interconnect support

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Message-ID: <6e8aa13a-c831-a7ee-70d3-f6b08fe6fbc3@samsung.com>
Date:   Tue, 24 Dec 2019 13:56:51 +0900
From:   Inki Dae <inki.dae@...sung.com>
To:     Artur Świgoń <a.swigon@...sung.com>,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-pm@...r.kernel.org, dri-devel@...ts.freedesktop.org
Cc:     Marek Szyprowski <m.szyprowski@...sung.com>, cw00.choi@...sung.com,
        myungjoo.ham@...sung.com, sw0312.kim@...sung.com,
        georgi.djakov@...aro.org, leonard.crestez@....com,
        b.zolnierkie@...sung.com, krzk@...nel.org
Subject: Re: [RFC PATCH v3 7/7] drm: exynos: mixer: Add interconnect support

Hi,

19. 12. 20. 오후 8:56에 Artur Świgoń 이(가) 쓴 글:
> From: Marek Szyprowski <m.szyprowski@...sung.com>
> 
> This patch adds interconnect support to exynos-mixer. The mixer works
> the same as before when CONFIG_INTERCONNECT is 'n'.
> 
> Co-developed-by: Artur Świgoń <a.swigon@...sung.com>
> Signed-off-by: Artur Świgoń <a.swigon@...sung.com>
> Signed-off-by: Marek Szyprowski <m.szyprowski@...sung.com>
> ---
>  drivers/gpu/drm/exynos/exynos_mixer.c | 71 +++++++++++++++++++++++++--
>  1 file changed, 66 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/gpu/drm/exynos/exynos_mixer.c b/drivers/gpu/drm/exynos/exynos_mixer.c
> index 6cfdb95fef2f..a7e7240a055f 100644
> --- a/drivers/gpu/drm/exynos/exynos_mixer.c
> +++ b/drivers/gpu/drm/exynos/exynos_mixer.c
> @@ -13,6 +13,7 @@
>  #include <linux/component.h>
>  #include <linux/delay.h>
>  #include <linux/i2c.h>
> +#include <linux/interconnect.h>
>  #include <linux/interrupt.h>
>  #include <linux/irq.h>
>  #include <linux/kernel.h>
> @@ -97,6 +98,7 @@ struct mixer_context {
>  	struct exynos_drm_crtc	*crtc;
>  	struct exynos_drm_plane	planes[MIXER_WIN_NR];
>  	unsigned long		flags;
> +	struct icc_path		*soc_path;
>  
>  	int			irq;
>  	void __iomem		*mixer_regs;
> @@ -931,6 +933,40 @@ static void mixer_disable_vblank(struct exynos_drm_crtc *crtc)
>  	mixer_reg_writemask(mixer_ctx, MXR_INT_EN, 0, MXR_INT_EN_VSYNC);
>  }
>  
> +static void mixer_set_memory_bandwidth(struct exynos_drm_crtc *crtc)
> +{
> +	struct drm_display_mode *mode = &crtc->base.state->adjusted_mode;
> +	struct mixer_context *ctx = crtc->ctx;
> +	unsigned long bw, bandwidth = 0;
> +	int i, j, sub;
> +
> +	if (!ctx->soc_path)
> +		return;
> +
> +	for (i = 0; i < MIXER_WIN_NR; i++) {
> +		struct drm_plane *plane = &ctx->planes[i].base;
> +		const struct drm_format_info *format;
> +
> +		if (plane->state && plane->state->crtc && plane->state->fb) {
> +			format = plane->state->fb->format;
> +			bw = mode->hdisplay * mode->vdisplay *
> +							drm_mode_vrefresh(mode);
> +			if (mode->flags & DRM_MODE_FLAG_INTERLACE)
> +				bw /= 2;
> +			for (j = 0; j < format->num_planes; j++) {
> +				sub = j ? (format->vsub * format->hsub) : 1;
> +				bandwidth += format->cpp[j] * bw / sub;
> +			}
> +		}
> +	}
> +
> +	/* add 20% safety margin */
> +	bandwidth = bandwidth / 4 * 5;
> +
> +	dev_dbg(ctx->dev, "exynos-mixer: safe bandwidth %ld Bps\n", bandwidth);
> +	icc_set_bw(ctx->soc_path, Bps_to_icc(bandwidth), 0);
> +}
> +
>  static void mixer_atomic_begin(struct exynos_drm_crtc *crtc)
>  {
>  	struct mixer_context *ctx = crtc->ctx;
> @@ -982,6 +1018,7 @@ static void mixer_atomic_flush(struct exynos_drm_crtc *crtc)
>  	if (!test_bit(MXR_BIT_POWERED, &mixer_ctx->flags))
>  		return;
>  
> +	mixer_set_memory_bandwidth(crtc);
>  	mixer_enable_sync(mixer_ctx);
>  	exynos_crtc_handle_event(crtc);
>  }
> @@ -1029,6 +1066,7 @@ static void mixer_disable(struct exynos_drm_crtc *crtc)
>  	for (i = 0; i < MIXER_WIN_NR; i++)
>  		mixer_disable_plane(crtc, &ctx->planes[i]);
>  > +	mixer_set_memory_bandwidth(crtc);

Your intention is to set peak and average bandwidth to 0 at disabling mixer device?

Thanks,
Inki Dae