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Date:   Wed, 29 Nov 2023 09:52:29 +0100
From:   Sascha Hauer <s.hauer@pengutronix.de>
To:     Andy Yan <andy.yan@rock-chips.com>
Cc:     Andy Yan <andyshrk@163.com>, heiko@sntech.de, hjc@rock-chips.com,
        dri-devel@lists.freedesktop.org,
        linux-rockchip@lists.infradead.org, linux-kernel@vger.kernel.org,
        krzysztof.kozlowski+dt@linaro.org, robh+dt@kernel.org,
        devicetree@vger.kernel.org, sebastian.reichel@collabora.com,
        kever.yang@rock-chips.com, chris.obbard@collabora.com
Subject: Re: [PATCH v2 11/12] drm/rockchip: vop2: Add debugfs support
Message-ID: <20231129085229.GC963049@pengutronix.de>
References: <20231122125316.3454268-1-andyshrk@163.com>
 <20231122125601.3455031-1-andyshrk@163.com>
 <20231127101337.GU3359458@pengutronix.de>
 <ea24a638-d10f-4f58-9992-1c80bafdd6d4@rock-chips.com>
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On Mon, Nov 27, 2023 at 06:56:34PM +0800, Andy Yan wrote:
>    Hi Sascha:
> 
>    thanks for you review.
> 
>    On 11/27/23 18:13, Sascha Hauer wrote:
> 
>  On Wed, Nov 22, 2023 at 08:56:01PM +0800, Andy Yan wrote:
> 
>  From: Andy Yan [1]<andy.yan@rock-chips.com>
> 
>  /sys/kernel/debug/dri/vop2/summary:  dump vop display state
>  /sys/kernel/debug/dri/vop2/regs: dump whole vop registers
>  /sys/kernel/debug/dri/vop2/active_regs: only dump the registers of
>  activated modules
> 
>  Signed-off-by: Andy Yan [2]<andy.yan@rock-chips.com>
>  ---
> 
>  (no changes since v1)
> 
>   drivers/gpu/drm/rockchip/rockchip_drm_vop2.c | 399 +++++++++++++++++++
>   1 file changed, 399 insertions(+)
> 
>  diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_vop2.c b/drivers/gpu/drm/rockchip/rockchip_drm_vop2.c
>  index 9eecbe1f71f9..4a2342209c15 100644
>  --- a/drivers/gpu/drm/rockchip/rockchip_drm_vop2.c
>  +++ b/drivers/gpu/drm/rockchip/rockchip_drm_vop2.c
>  @@ -27,6 +27,7 @@
>   #include <drm/drm_debugfs.h>
>   #include <drm/drm_flip_work.h>
>   #include <drm/drm_framebuffer.h>
>  +#include <drm/drm_gem_framebuffer_helper.h>
>   #include <drm/drm_probe_helper.h>
>   #include <drm/drm_vblank.h>
> 
>  @@ -187,6 +188,7 @@ struct vop2 {
>           */
>          u32 registered_num_wins;
> 
>  +       struct resource *res;
>          void __iomem *regs;
>          struct regmap *map;
> 
>  @@ -228,6 +230,44 @@ struct vop2 {
>   #define vop2_output_if_is_lvds(x)      (x == ROCKCHIP_VOP2_EP_LVDS0 || x == ROCKCHIP_VOP2_EP_LVDS1)
>   #define vop2_output_if_is_dpi(x)       (x == ROCKCHIP_VOP2_EP_RGB0)
> 
>  +struct vop2_regs_dump {
>  +       const char *name;
>  +       u32 base;
>  +       u32 en_reg;
>  +       u32 en_val;
>  +       u32 en_mask;
>  +};
>  +
>  +/*
>  + * bus-format types.
>  + */
>  +struct drm_bus_format_enum_list {
>  +       int type;
>  +       const char *name;
>  +};
>  +
>  +static const struct drm_bus_format_enum_list drm_bus_format_enum_list[] = {
>  +       { DRM_MODE_CONNECTOR_Unknown, "Unknown" },
>  +       { MEDIA_BUS_FMT_RGB565_1X16, "RGB565_1X16" },
>  +       { MEDIA_BUS_FMT_RGB666_1X18, "RGB666_1X18" },
>  +       { MEDIA_BUS_FMT_RGB666_1X24_CPADHI, "RGB666_1X24_CPADHI" },
>  +       { MEDIA_BUS_FMT_RGB666_1X7X3_SPWG, "RGB666_1X7X3_SPWG" },
>  +       { MEDIA_BUS_FMT_YUV8_1X24, "YUV8_1X24" },
>  +       { MEDIA_BUS_FMT_UYYVYY8_0_5X24, "UYYVYY8_0_5X24" },
>  +       { MEDIA_BUS_FMT_YUV10_1X30, "YUV10_1X30" },
>  +       { MEDIA_BUS_FMT_UYYVYY10_0_5X30, "UYYVYY10_0_5X30" },
>  +       { MEDIA_BUS_FMT_RGB888_3X8, "RGB888_3X8" },
>  +       { MEDIA_BUS_FMT_RGB888_1X24, "RGB888_1X24" },
>  +       { MEDIA_BUS_FMT_RGB888_1X7X4_SPWG, "RGB888_1X7X4_SPWG" },
>  +       { MEDIA_BUS_FMT_RGB888_1X7X4_JEIDA, "RGB888_1X7X4_JEIDA" },
>  +       { MEDIA_BUS_FMT_UYVY8_2X8, "UYVY8_2X8" },
>  +       { MEDIA_BUS_FMT_YUYV8_1X16, "YUYV8_1X16" },
>  +       { MEDIA_BUS_FMT_UYVY8_1X16, "UYVY8_1X16" },
>  +       { MEDIA_BUS_FMT_RGB101010_1X30, "RGB101010_1X30" },
>  +       { MEDIA_BUS_FMT_YUYV10_1X20, "YUYV10_1X20" },
>  +};
>  +static DRM_ENUM_NAME_FN(drm_get_bus_format_name, drm_bus_format_enum_list)
>  +
>   static const struct regmap_config vop2_regmap_config;
> 
>   static struct vop2_video_port *to_vop2_video_port(struct drm_crtc *crtc)
>  @@ -2487,6 +2527,363 @@ static const struct drm_crtc_helper_funcs vop2_crtc_helper_funcs = {
>          .atomic_disable = vop2_crtc_atomic_disable,
>   };
> 
>  +static void vop2_dump_connector_on_crtc(struct drm_crtc *crtc, struct seq_file *s)
>  +{
>  +       struct drm_connector_list_iter conn_iter;
>  +       struct drm_connector *connector;
>  +
>  +       drm_connector_list_iter_begin(crtc->dev, &conn_iter);
>  +       drm_for_each_connector_iter(connector, &conn_iter) {
>  +               if (crtc->state->connector_mask & drm_connector_mask(connector))
>  +                       seq_printf(s, "    Connector: %s\n", connector->name);
>  +
>  +       }
>  +       drm_connector_list_iter_end(&conn_iter);
>  +}
>  +
>  +static int vop2_plane_state_dump(struct seq_file *s, struct drm_plane *plane)
>  +{
>  +       struct vop2_win *win = to_vop2_win(plane);
>  +       struct drm_plane_state *pstate = plane->state;
>  +       struct drm_rect *src, *dst;
>  +       struct drm_framebuffer *fb;
>  +       struct drm_gem_object *obj;
>  +       struct rockchip_gem_object *rk_obj;
>  +       bool xmirror;
>  +       bool ymirror;
>  +       bool rotate_270;
>  +       bool rotate_90;
>  +       dma_addr_t fb_addr;
>  +       int i;
>  +
>  +       seq_printf(s, "    %s: %s\n", win->data->name, pstate->crtc ? "ACTIVE" : "DISABLED");
>  +       if (!pstate || !pstate->fb)
>  +               return 0;
>  +
>  +       fb = pstate->fb;
>  +       src = &pstate->src;
>  +       dst = &pstate->dst;
>  +       xmirror = pstate->rotation & DRM_MODE_REFLECT_X ? true : false;
>  +       ymirror = pstate->rotation & DRM_MODE_REFLECT_Y ? true : false;
>  +       rotate_270 = pstate->rotation & DRM_MODE_ROTATE_270;
>  +       rotate_90 = pstate->rotation & DRM_MODE_ROTATE_90;
>  +
>  +       seq_printf(s, "\twin_id: %d\n", win->win_id);
>  +
>  +       seq_printf(s, "\tformat: %p4cc%s glb_alpha[0x%x]\n",
>  +                  &fb->format->format,
>  +                  drm_is_afbc(fb->modifier) ? "[AFBC]" : "",
>  +                  pstate->alpha >> 8);
>  +       seq_printf(s, "\trotate: xmirror: %d ymirror: %d rotate_90: %d rotate_270: %d\n",
>  +                  xmirror, ymirror, rotate_90, rotate_270);
>  +       seq_printf(s, "\tzpos: %d\n", pstate->normalized_zpos);
>  +       seq_printf(s, "\tsrc: pos[%d, %d] rect[%d x %d]\n", src->x1 >> 16,
>  +                  src->y1 >> 16, drm_rect_width(src) >> 16,
>  +                  drm_rect_height(src) >> 16);
>  +       seq_printf(s, "\tdst: pos[%d, %d] rect[%d x %d]\n", dst->x1, dst->y1,
>  +                  drm_rect_width(dst), drm_rect_height(dst));
>  +
>  +       for (i = 0; i < fb->format->num_planes; i++) {
>  +               obj = fb->obj[0];
>  +               rk_obj = to_rockchip_obj(obj);
>  +               fb_addr = rk_obj->dma_addr + fb->offsets[0];
>  +
>  +               seq_printf(s, "\tbuf[%d]: addr: %pad pitch: %d offset: %d\n",
>  +                          i, &fb_addr, fb->pitches[i], fb->offsets[i]);
>  +       }
>  +
>  +       return 0;
>  +}
>  +
>  +static int vop2_crtc_state_dump(struct drm_crtc *crtc, struct seq_file *s)
>  +{
>  +       struct vop2_video_port *vp = to_vop2_video_port(crtc);
>  +       struct drm_crtc_state *cstate = crtc->state;
>  +       struct rockchip_crtc_state *vcstate;
>  +       struct drm_display_mode *mode;
>  +       struct drm_plane *plane;
>  +       bool interlaced;
>  +
>  +       seq_printf(s, "Video Port%d: %s\n", vp->id, !cstate ?
>  +                  "DISABLED" : cstate->active ? "ACTIVE" : "DISABLED");
>  +
>  +       if (!cstate || !cstate->active)
>  +               return 0;
>  +
>  +       mode = &crtc->state->adjusted_mode;
>  +       vcstate = to_rockchip_crtc_state(cstate);
>  +       interlaced = !!(mode->flags & DRM_MODE_FLAG_INTERLACE);
>  +
>  +       vop2_dump_connector_on_crtc(crtc, s);
>  +       seq_printf(s, "\tbus_format[%x]: %s\n", vcstate->bus_format,
>  +                   drm_get_bus_format_name(vcstate->bus_format));
>  +       seq_printf(s, "\toutput_mode[%x]", vcstate->output_mode);
>  +       seq_printf(s, " color_space[%d]\n", vcstate->color_space);
>  +       seq_printf(s, "    Display mode: %dx%d%s%d\n",
>  +                   mode->hdisplay, mode->vdisplay, interlaced ? "i" : "p",
>  +                   drm_mode_vrefresh(mode));
>  +       seq_printf(s, "\tclk[%d] real_clk[%d] type[%x] flag[%x]\n",
>  +                   mode->clock, mode->crtc_clock, mode->type, mode->flags);
>  +       seq_printf(s, "\tH: %d %d %d %d\n", mode->hdisplay, mode->hsync_start,
>  +                   mode->hsync_end, mode->htotal);
>  +       seq_printf(s, "\tV: %d %d %d %d\n", mode->vdisplay, mode->vsync_start,
>  +                   mode->vsync_end, mode->vtotal);
>  +
>  +       drm_atomic_crtc_for_each_plane(plane, crtc) {
>  +               vop2_plane_state_dump(s, plane);
>  +       }
>  +
>  +       return 0;
>  +}
>  +
>  +static int vop2_summary_show(struct seq_file *s, void *data)
>  +{
>  +       struct drm_info_node *node = s->private;
>  +       struct drm_minor *minor = node->minor;
>  +       struct drm_device *drm_dev = minor->dev;
>  +       struct drm_crtc *crtc;
>  +
>  +       drm_modeset_lock_all(drm_dev);
>  +       drm_for_each_crtc(crtc, drm_dev) {
>  +               vop2_crtc_state_dump(crtc, s);
>  +       }
>  +       drm_modeset_unlock_all(drm_dev);
>  +
>  +       return 0;
>  +}
>  +
>  +static void vop2_regs_print(struct vop2 *vop2, struct seq_file *s, struct vop2_regs_dump *dump)
>  +{
>  +       resource_size_t start;
>  +       const int reg_num = 0x110 / 4;
> 
>  If I'm not mistaken this prints a register space of 0x110 bytes.
>  Shouldn't it be 0x100 bytes instead?
> 
>  Also, are all these register spaces really have the same size? Does it
>  make sense to add the size to struct vop2_regs_dump?
> 
>    In fact, most used registers of the most blocks are not more than 100, but
>    for Cluster windows,
> 
>    there is a CLUSTER_CTRL register sting at 0x100.
> 
>    I think i should add the size to struct vop2_regs_dump.
> 
> 
>  +       u32 val;
>  +       int i;
>  +
>  +       if (dump->en_mask) {
>  +               val = vop2_readl(vop2, dump->base + dump->en_reg);
>  +               if ((val & dump->en_mask) != dump->en_val)
>  +                       return;
>  +       }
>  +       seq_printf(s, "\n%s:\n", dump->name);
>  +
>  +       start = vop2->res->start + dump->base;
>  +       for (i = 0; i < reg_num;) {
>  +               seq_printf(s, "%08x:  %08x %08x %08x %08x\n", (u32)start + i * 4,
>  +                          vop2_readl(vop2, dump->base + (4 * i)),
>  +                          vop2_readl(vop2, dump->base + (4 * (i + 1))),
>  +                          vop2_readl(vop2, dump->base + (4 * (i + 2))),
>  +                          vop2_readl(vop2, dump->base + (4 * (i + 3))));
>  +               i += 4;
>  +       }
>  +
>  +}
>  +
>  +static int vop2_regs_show(struct seq_file *s, void *arg)
>  +{
>  +       struct drm_info_node *node = s->private;
>  +       struct vop2 *vop2 = (struct vop2 *)node->info_ent->data;
>  +       struct drm_minor *minor = node->minor;
>  +       struct drm_device *drm_dev = minor->dev;
>  +
>  +       struct vop2_regs_dump dump;
>  +
>  +       drm_modeset_lock_all(drm_dev);
>  +
>  +       if (vop2->enable_count) {
>  +               dump.en_mask = 0;
>  +
>  +               dump.name = "SYS";
>  +               dump.base = RK3568_REG_CFG_DONE;
>  +               vop2_regs_print(vop2, s, &dump);
> 
>  Can you create a statically initialized array of struct vop2_regs_dump
>  and iterate over it?
>  You would need an additional present_in_soc_xy flag in struct
>  vop2_regs_dump, but other than that I don't see a problem and the result
>  might look better.
> 
>  For the windows it might also be an option to iterate over
>  vop2->data->win instead. This array already contains the register base
>  addresses and window names.
> 
>    In fact, we have a dump_regs? arrar in vop2_data per soc in our bsp
>    kernel[0],
> 
>    do you like something like that?
> 
>    [0]
>    [3]https://github.com/armbian/linux-rockchip/blob/rk-5.10-rkr6/drivers/gpu/drm/rockchip/rockchip_vop2_reg.c#L3684

This looks good from a first glance. I would suggest using C99
initializers though.

>  Not sure if we really need an additional debugfs entry to print only the
>  active entities, but if we do then we could avoid a bit of code
>  duplication by adding creating a common register dump function called
>  from vop2_regs_show() and vop2_active_regs_show() which takes an
>  additional ignore_disabled argument.
> 
>    As the whole vop2 registers block is very large, so some times only dump
> 
>    active modules make we dig bugs easier.
> 
>    It seems that if we? "initialized array of struct vop2_regs_dump" as you
>    said befor, we can avoid
> 
>    some duplication code here?

Yes.

Sascha

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