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Message-ID: <485b38c1-517c-d3fd-c5c0-7136cbae25e2@riseup.net>
Date: Tue, 30 Aug 2022 10:01:11 -0300
From: Maíra Canal <mairacanal@...eup.net>
To: Maxime Ripard <maxime@...no.tech>,
Maxime Ripard <mripard@...nel.org>,
Ben Skeggs <bskeggs@...hat.com>,
David Airlie <airlied@...ux.ie>, Chen-Yu Tsai <wens@...e.org>,
Thomas Zimmermann <tzimmermann@...e.de>,
Jani Nikula <jani.nikula@...ux.intel.com>,
Lyude Paul <lyude@...hat.com>,
Philipp Zabel <p.zabel@...gutronix.de>,
Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
Rodrigo Vivi <rodrigo.vivi@...el.com>,
Tvrtko Ursulin <tvrtko.ursulin@...ux.intel.com>,
Jernej Skrabec <jernej.skrabec@...il.com>,
Samuel Holland <samuel@...lland.org>,
Karol Herbst <kherbst@...hat.com>,
Noralf Trønnes <noralf@...nnes.org>,
Emma Anholt <emma@...olt.net>, Daniel Vetter <daniel@...ll.ch>,
Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>
Cc: Dom Cobley <dom@...pberrypi.com>,
Dave Stevenson <dave.stevenson@...pberrypi.com>,
nouveau@...ts.freedesktop.org, intel-gfx@...ts.freedesktop.org,
linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
linux-sunxi@...ts.linux.dev, Hans de Goede <hdegoede@...hat.com>,
Geert Uytterhoeven <geert@...ux-m68k.org>,
Mateusz Kwiatkowski <kfyatek+publicgit@...il.com>,
Phil Elwell <phil@...pberrypi.com>,
linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v2 10/41] drm/modes: Add a function to generate analog
display modes
Hi Maxime,
On 8/29/22 10:11, Maxime Ripard wrote:
> Multiple drivers (meson, vc4, sun4i) define analog TV 525-lines and
> 625-lines modes in their drivers.
>
> Since those modes are fairly standard, and that we'll need to use them
> in more places in the future, it makes sense to move their definition
> into the core framework.
>
> However, analog display usually have fairly loose timings requirements,
> the only discrete parameters being the total number of lines and pixel
> clock frequency. Thus, we created a function that will create a display
> mode from the standard, the pixel frequency and the active area.
>
> Signed-off-by: Maxime Ripard <maxime@...no.tech>
>
> diff --git a/drivers/gpu/drm/drm_modes.c b/drivers/gpu/drm/drm_modes.c
> index 304004fb80aa..ee581ee17171 100644
> --- a/drivers/gpu/drm/drm_modes.c
> +++ b/drivers/gpu/drm/drm_modes.c
> @@ -116,6 +116,459 @@ void drm_mode_probed_add(struct drm_connector *connector,
> }
> EXPORT_SYMBOL(drm_mode_probed_add);
>
> +enum drm_mode_analog {
> + DRM_MODE_ANALOG_NTSC,
> + DRM_MODE_ANALOG_PAL,
> +};
> +
> +/*
> + * The timings come from:
> + * - https://web.archive.org/web/20220406232708/http://www.kolumbus.fi/pami1/video/pal_ntsc.html
> + * - https://web.archive.org/web/20220406124914/http://martin.hinner.info/vga/pal.html
> + * - https://web.archive.org/web/20220609202433/http://www.batsocks.co.uk/readme/video_timing.htm
> + */
> +#define NTSC_LINE_DURATION_NS 63556U
> +#define NTSC_LINES_NUMBER 525
> +
> +#define NTSC_HBLK_DURATION_TYP_NS 10900U
> +#define NTSC_HBLK_DURATION_MIN_NS (NTSC_HBLK_DURATION_TYP_NS - 200)
> +#define NTSC_HBLK_DURATION_MAX_NS (NTSC_HBLK_DURATION_TYP_NS + 200)
> +
> +#define NTSC_HACT_DURATION_TYP_NS (NTSC_LINE_DURATION_NS - NTSC_HBLK_DURATION_TYP_NS)
> +#define NTSC_HACT_DURATION_MIN_NS (NTSC_LINE_DURATION_NS - NTSC_HBLK_DURATION_MAX_NS)
> +#define NTSC_HACT_DURATION_MAX_NS (NTSC_LINE_DURATION_NS - NTSC_HBLK_DURATION_MIN_NS)
> +
> +#define NTSC_HFP_DURATION_TYP_NS 1500
> +#define NTSC_HFP_DURATION_MIN_NS 1270
> +#define NTSC_HFP_DURATION_MAX_NS 2220
> +
> +#define NTSC_HSLEN_DURATION_TYP_NS 4700
> +#define NTSC_HSLEN_DURATION_MIN_NS (NTSC_HSLEN_DURATION_TYP_NS - 100)
> +#define NTSC_HSLEN_DURATION_MAX_NS (NTSC_HSLEN_DURATION_TYP_NS + 100)
> +
> +#define NTSC_HBP_DURATION_TYP_NS 4700
> +
> +/*
> + * I couldn't find the actual tolerance for the back porch, so let's
> + * just reuse the sync length ones.
> + */
> +#define NTSC_HBP_DURATION_MIN_NS (NTSC_HBP_DURATION_TYP_NS - 100)
> +#define NTSC_HBP_DURATION_MAX_NS (NTSC_HBP_DURATION_TYP_NS + 100)
> +
> +#define PAL_LINE_DURATION_NS 64000U
> +#define PAL_LINES_NUMBER 625
> +
> +#define PAL_HACT_DURATION_TYP_NS 51950U
> +#define PAL_HACT_DURATION_MIN_NS (PAL_HACT_DURATION_TYP_NS - 100)
> +#define PAL_HACT_DURATION_MAX_NS (PAL_HACT_DURATION_TYP_NS + 400)
> +
> +#define PAL_HBLK_DURATION_TYP_NS (PAL_LINE_DURATION_NS - PAL_HACT_DURATION_TYP_NS)
> +#define PAL_HBLK_DURATION_MIN_NS (PAL_LINE_DURATION_NS - PAL_HACT_DURATION_MAX_NS)
> +#define PAL_HBLK_DURATION_MAX_NS (PAL_LINE_DURATION_NS - PAL_HACT_DURATION_MIN_NS)
> +
> +#define PAL_HFP_DURATION_TYP_NS 1650
> +#define PAL_HFP_DURATION_MIN_NS (PAL_HFP_DURATION_TYP_NS - 100)
> +#define PAL_HFP_DURATION_MAX_NS (PAL_HFP_DURATION_TYP_NS + 400)
> +
> +#define PAL_HSLEN_DURATION_TYP_NS 4700
> +#define PAL_HSLEN_DURATION_MIN_NS (PAL_HSLEN_DURATION_TYP_NS - 200)
> +#define PAL_HSLEN_DURATION_MAX_NS (PAL_HSLEN_DURATION_TYP_NS + 200)
> +
> +#define PAL_HBP_DURATION_TYP_NS 5700
> +#define PAL_HBP_DURATION_MIN_NS (PAL_HBP_DURATION_TYP_NS - 200)
> +#define PAL_HBP_DURATION_MAX_NS (PAL_HBP_DURATION_TYP_NS + 200)
> +
> +#define PAL_VFP_INTERLACE_LINES 5
> +#define PAL_VSLEN_INTERLACE_LINES 5
> +
> +#define PAL_SHORT_SYNC_DURATION_NS ((2 + 30) * NSEC_PER_USEC)
> +#define PAL_LONG_SYNC_DURATION_NS ((30 + 2) * NSEC_PER_USEC)
> +
> +struct analog_param_field {
> + unsigned int even, odd;
> +};
> +
> +#define PARAM_FIELD(_odd, _even) \
> + { .even = _even, .odd = _odd }
> +
> +struct analog_param_range {
> + unsigned int min, typ, max;
> +};
> +
> +#define PARAM_RANGE(_min, _typ, _max) \
> + { .min = _min, .typ = _typ, .max = _max }
> +
> +struct analog_parameters {
> + unsigned int num_lines;
> + unsigned int line_duration_ns;
> +
> + struct analog_param_range hact_ns;
> + struct analog_param_range hfp_ns;
> + struct analog_param_range hslen_ns;
> + struct analog_param_range hbp_ns;
> + struct analog_param_range hblk_ns;
> +
> + struct analog_param_field vfp_lines;
> + struct analog_param_field vslen_lines;
> + struct analog_param_field vbp_lines;
> +};
> +
> +#define TV_MODE_PARAMETER(_mode, _lines, _line_dur, _hact, _hfp, _hslen, _hbp, _hblk, _vfp, _vslen, _vbp) \
> + [_mode] = { \
> + .num_lines = _lines, \
> + .line_duration_ns = _line_dur, \
> + .hact_ns = _hact, \
> + .hfp_ns = _hfp, \
> + .hslen_ns = _hslen, \
> + .hbp_ns = _hbp, \
> + .hblk_ns = _hblk, \
> + .vfp_lines = _vfp, \
> + .vslen_lines = _vslen, \
> + .vbp_lines = _vbp, \
> + }
> +
> +const static struct analog_parameters tv_modes_parameters[] = {
> + TV_MODE_PARAMETER(DRM_MODE_ANALOG_NTSC,
> + NTSC_LINES_NUMBER,
> + NTSC_LINE_DURATION_NS,
> + PARAM_RANGE(NTSC_HACT_DURATION_MIN_NS,
> + NTSC_HACT_DURATION_TYP_NS,
> + NTSC_HACT_DURATION_MAX_NS),
> + PARAM_RANGE(NTSC_HFP_DURATION_MIN_NS,
> + NTSC_HFP_DURATION_TYP_NS,
> + NTSC_HFP_DURATION_MAX_NS),
> + PARAM_RANGE(NTSC_HSLEN_DURATION_MIN_NS,
> + NTSC_HSLEN_DURATION_TYP_NS,
> + NTSC_HSLEN_DURATION_MAX_NS),
> + PARAM_RANGE(NTSC_HBP_DURATION_MIN_NS,
> + NTSC_HBP_DURATION_TYP_NS,
> + NTSC_HBP_DURATION_MAX_NS),
> + PARAM_RANGE(NTSC_HBLK_DURATION_MIN_NS,
> + NTSC_HBLK_DURATION_TYP_NS,
> + NTSC_HBLK_DURATION_MAX_NS),
> + PARAM_FIELD(3, 3),
> + PARAM_FIELD(3, 3),
> + PARAM_FIELD(3, 3)),
> + TV_MODE_PARAMETER(DRM_MODE_ANALOG_PAL,
> + PAL_LINES_NUMBER,
> + PAL_LINE_DURATION_NS,
> + PARAM_RANGE(PAL_HACT_DURATION_MIN_NS,
> + PAL_HACT_DURATION_TYP_NS,
> + PAL_HACT_DURATION_MAX_NS),
> + PARAM_RANGE(PAL_HFP_DURATION_MIN_NS,
> + PAL_HFP_DURATION_TYP_NS,
> + PAL_HFP_DURATION_MAX_NS),
> + PARAM_RANGE(PAL_HSLEN_DURATION_MIN_NS,
> + PAL_HSLEN_DURATION_TYP_NS,
> + PAL_HSLEN_DURATION_MAX_NS),
> + PARAM_RANGE(PAL_HBP_DURATION_MIN_NS,
> + PAL_HBP_DURATION_TYP_NS,
> + PAL_HBP_DURATION_MAX_NS),
> + PARAM_RANGE(PAL_HBLK_DURATION_MIN_NS,
> + PAL_HBLK_DURATION_TYP_NS,
> + PAL_HBLK_DURATION_MAX_NS),
> +
> + /*
> + * The front porch is actually 6 short sync
> + * pulses for the even field, and 5 for the
> + * odd field. Each sync takes half a life so
> + * the odd field front porch is shorter by
> + * half a line.
> + *
> + * In progressive, we're supposed to use 6
> + * pulses, so we're fine there
> + */
> + PARAM_FIELD(3, 2),
> +
> + /*
> + * The vsync length is 5 long sync pulses,
> + * each field taking half a line. We're
> + * shorter for both fields by half a line.
> + *
> + * In progressive, we're supposed to use 5
> + * pulses, so we're off by half
> + * a line.
> + *
> + * In interlace, we're now off by half a line
> + * for the even field and one line for the odd
> + * field.
> + */
> + PARAM_FIELD(3, 3),
> +
> + /*
> + * The back porch is actually 5 short sync
> + * pulses for the even field, 4 for the odd
> + * field. In progressive, it's 5 short syncs.
> + *
> + * In progressive, we thus have 2.5 lines,
> + * plus the 0.5 line we were missing
> + * previously, so we should use 3 lines.
> + *
> + * In interlace, the even field is in the
> + * exact same case than progressive. For the
> + * odd field, we should be using 2 lines but
> + * we're one line short, so we'll make up for
> + * it here by using 3.
> + */
> + PARAM_FIELD(3, 3)),
> +};
> +
> +static int fill_analog_mode(struct drm_display_mode *mode,
> + const struct analog_parameters *params,
> + unsigned long pixel_clock_hz,
> + unsigned int hactive,
> + unsigned int vactive,
> + bool interlace)
> +{
> + unsigned long pixel_duration_ns = NSEC_PER_SEC / pixel_clock_hz;
> + unsigned long long htotal;
> + unsigned int vtotal;
> + unsigned int max_hact, hact_duration_ns;
> + unsigned int hblk, hblk_duration_ns;
> + unsigned int hfp, hfp_min, hfp_duration_ns;
> + unsigned int hslen, hslen_duration_ns;
> + unsigned int hbp, hbp_min, hbp_duration_ns;
> + unsigned int porches, porches_duration_ns;
> + unsigned int vfp, vfp_min;
> + unsigned int vbp, vbp_min;
> + unsigned int vslen;
> + int porches_rem;
> + bool strict = true;
> +
> + max_hact = params->hact_ns.max / pixel_duration_ns;
> + if (pixel_clock_hz == 13500000 && hactive > max_hact && hactive <= 720)
> + strict = false;
> +
> + /*
> + * Our pixel duration is going to be round down by the division,
> + * so rounding up is probably going to introduce even more
> + * deviation.
> + */
> + htotal = params->line_duration_ns * pixel_clock_hz / NSEC_PER_SEC;
> +
> + hact_duration_ns = hactive * pixel_duration_ns;
> + if (strict &&
> + (hact_duration_ns < params->hact_ns.min ||
> + hact_duration_ns > params->hact_ns.max)) {
> + DRM_ERROR("Invalid horizontal active area duration: %uns (min: %u, max %u)\n",
> + hact_duration_ns, params->hact_ns.min, params->hact_ns.max);
> + return -EINVAL;
> + }
> +
> + hblk = htotal - hactive;
> + hblk_duration_ns = hblk * pixel_duration_ns;
> + if (strict &&
> + (hblk_duration_ns < params->hblk_ns.min ||
> + hblk_duration_ns > params->hblk_ns.max)) {
> + DRM_ERROR("Invalid horizontal blanking duration: %uns (min: %u, max %u)\n",
> + hblk_duration_ns, params->hblk_ns.min, params->hblk_ns.max);
> + return -EINVAL;
> + }
> +
> + hslen = DIV_ROUND_UP(params->hslen_ns.typ, pixel_duration_ns);
> + hslen_duration_ns = hslen * pixel_duration_ns;
> + if (strict &&
> + (hslen_duration_ns < params->hslen_ns.min ||
> + hslen_duration_ns > params->hslen_ns.max)) {
> + DRM_ERROR("Invalid horizontal sync duration: %uns (min: %u, max %u)\n",
> + hslen_duration_ns, params->hslen_ns.min, params->hslen_ns.max);
> + return -EINVAL;
> + }
> +
> + porches = hblk - hslen;
> + porches_duration_ns = porches * pixel_duration_ns;
> + if (strict &&
> + (porches_duration_ns > (params->hfp_ns.max + params->hbp_ns.max) ||
> + porches_duration_ns < (params->hfp_ns.min + params->hbp_ns.min))) {
> + DRM_ERROR("Invalid horizontal porches duration: %uns\n", porches_duration_ns);
> + return -EINVAL;
> + }
> +
> + hfp_min = DIV_ROUND_UP(params->hfp_ns.min, pixel_duration_ns);
> + hbp_min = DIV_ROUND_UP(params->hbp_ns.min, pixel_duration_ns);
> + porches_rem = porches - hfp_min - hbp_min;
> +
> + hfp = hfp_min + DIV_ROUND_UP(porches_rem, 2);
> + hfp_duration_ns = hfp * pixel_duration_ns;
> + if (strict &&
> + (hfp_duration_ns < params->hfp_ns.min ||
> + hfp_duration_ns > params->hfp_ns.max)) {
> + DRM_ERROR("Invalid horizontal front porch duration: %uns (min: %u, max %u)\n",
> + hfp_duration_ns, params->hfp_ns.min, params->hfp_ns.max);
> + return -EINVAL;
> + }
> +
> + hbp = porches - hfp;
> + hbp_duration_ns = hbp * pixel_duration_ns;
> + if (strict &&
> + (hbp_duration_ns < params->hbp_ns.min ||
> + hbp_duration_ns > params->hbp_ns.max)) {
> + DRM_ERROR("Invalid horizontal back porch duration: %uns (min: %u, max %u)\n",
> + hbp_duration_ns, params->hbp_ns.min, params->hbp_ns.max);
> + return -EINVAL;
> + }
> +
> + if (htotal != (hactive + hfp + hslen + hbp))
> + return -EINVAL;
> +
> + mode->clock = pixel_clock_hz / 1000;
> + mode->hdisplay = hactive;
> + mode->hsync_start = hactive + hfp;
> + mode->hsync_end = hactive + hfp + hslen;
> + mode->htotal = hactive + hfp + hslen + hbp;
> +
> + if (interlace) {
> + vfp_min = params->vfp_lines.even + params->vfp_lines.odd;
> + vbp_min = params->vbp_lines.even + params->vbp_lines.odd;
> + vslen = params->vslen_lines.even + params->vslen_lines.odd;
> + } else {
> + /*
> + * By convention, NSTC (aka 525/60) systems start with
> + * the even field, but PAL (aka 625/50) systems start
> + * with the odd one.
> + *
> + * PAL systems also have asymetric timings between the
> + * even and odd field, while NTSC is symetric.
> + *
> + * Moreover, if we want to create a progressive mode for
> + * PAL, we need to use the odd field timings.
> + *
> + * Since odd == even for NTSC, we can just use the odd
> + * one all the time to simplify the code a bit.
> + */
> + vfp_min = params->vfp_lines.odd;
> + vbp_min = params->vbp_lines.odd;
> + vslen = params->vslen_lines.odd;
> + }
> +
> + porches = params->num_lines - vactive - vslen;
> + porches_rem = porches - vfp_min - vbp_min;
> +
> + vfp = vfp_min + (porches_rem / 2);
> + vbp = porches - vfp;
> +
> + vtotal = vactive + vfp + vslen + vbp;
> + if (params->num_lines != vtotal) {
> + DRM_ERROR("Invalid vertical total: %upx (expected %upx)\n",
> + vtotal, params->num_lines);
> + return -EINVAL;
> + }
> +
> + mode->vdisplay = vactive;
> + mode->vsync_start = vactive + vfp;
> + mode->vsync_end = vactive + vfp + vslen;
> + mode->vtotal = vactive + vfp + vslen + vbp;
> +
> + mode->type = DRM_MODE_TYPE_DRIVER;
> + mode->flags = DRM_MODE_FLAG_NVSYNC | DRM_MODE_FLAG_NHSYNC;
> + if (interlace)
> + mode->flags |= DRM_MODE_FLAG_INTERLACE;
> +
> + drm_mode_set_name(mode);
> +
> + if (mode->vtotal != params->num_lines)
> + return -EINVAL;
> +
> + return 0;
> +}
> +
> +/**
> + * drm_analog_tv_mode - create a display mode for an analog TV
> + * @dev: drm device
> + * @tv_mode: TV Mode standard to create a mode for. See DRM_MODE_TV_MODE_*.
> + * @pixel_clock_hz: Pixel Clock Frequency, in Hertz
> + * @hdisplay: hdisplay size
> + * @vdisplay: vdisplay size
> + * @interlace: whether to compute an interlaced mode
> + *
> + * This function creates a struct drm_display_mode instance suited for
> + * an analog TV output, for one of the usual analog TV mode.
> + *
> + * Note that @hdisplay is larger than the usual constraints for the PAL
> + * and NTSC timings, and we'll choose to ignore most timings constraints
> + * to reach those resolutions.
> + *
> + * Returns:
> + *
> + * A pointer to the mode, allocated with drm_mode_create(). Returns NULL
> + * on error.
> + */
> +struct drm_display_mode *drm_analog_tv_mode(struct drm_device *dev,
> + enum drm_connector_tv_mode tv_mode,
> + unsigned long pixel_clock_hz,
> + unsigned int hdisplay,
> + unsigned int vdisplay,
> + bool interlace)
> +{
> + struct drm_display_mode *mode;
> + enum drm_mode_analog analog;
> + int ret;
> +
> + switch (tv_mode) {
> + case DRM_MODE_TV_MODE_NTSC_443:
> + fallthrough;
> + case DRM_MODE_TV_MODE_NTSC_J:
> + fallthrough;
> + case DRM_MODE_TV_MODE_NTSC_M:
> + fallthrough;
> + case DRM_MODE_TV_MODE_PAL_60:
> + fallthrough;
> + case DRM_MODE_TV_MODE_PAL_M:
> + fallthrough;
> + case DRM_MODE_TV_MODE_SECAM_60:
> + analog = DRM_MODE_ANALOG_NTSC;
> + break;
> +
> + case DRM_MODE_TV_MODE_PAL_B:
> + fallthrough;
> + case DRM_MODE_TV_MODE_PAL_D:
> + fallthrough;
> + case DRM_MODE_TV_MODE_PAL_G:
> + fallthrough;
> + case DRM_MODE_TV_MODE_PAL_H:
> + fallthrough;
> + case DRM_MODE_TV_MODE_PAL_I:
> + fallthrough;
> + case DRM_MODE_TV_MODE_PAL_N:
> + fallthrough;
> + case DRM_MODE_TV_MODE_PAL_NC:
> + fallthrough;
> + case DRM_MODE_TV_MODE_SECAM_B:
> + fallthrough;
> + case DRM_MODE_TV_MODE_SECAM_D:
> + fallthrough;
> + case DRM_MODE_TV_MODE_SECAM_G:
> + fallthrough;
> + case DRM_MODE_TV_MODE_SECAM_K:
> + fallthrough;
> + case DRM_MODE_TV_MODE_SECAM_K1:
> + fallthrough;
> + case DRM_MODE_TV_MODE_SECAM_L:
> + analog = DRM_MODE_ANALOG_PAL;
> + break;
> +
> + default:
> + return NULL;
> + }
> +
> + mode = drm_mode_create(dev);
> + if (!mode)
> + return NULL;
> +
> + ret = fill_analog_mode(mode,
> + &tv_modes_parameters[analog],
> + pixel_clock_hz, hdisplay, vdisplay, interlace);
> + if (ret)
> + goto err_free_mode;
> +
> + return mode;
> +
> +err_free_mode:
> + drm_mode_destroy(dev, mode);
> + return NULL;
> +}
> +EXPORT_SYMBOL(drm_analog_tv_mode);
> +
> /**
> * drm_cvt_mode -create a modeline based on the CVT algorithm
> * @dev: drm device
> diff --git a/drivers/gpu/drm/tests/Makefile b/drivers/gpu/drm/tests/Makefile
> index b29ef1085cad..b22ac96fdd65 100644
> --- a/drivers/gpu/drm/tests/Makefile
> +++ b/drivers/gpu/drm/tests/Makefile
> @@ -10,5 +10,6 @@ obj-$(CONFIG_DRM_KUNIT_TEST) += \
> drm_framebuffer_test.o \
> drm_kunit_helpers.o \
> drm_mm_test.o \
> + drm_modes_test.o \
> drm_plane_helper_test.o \
> drm_rect_test.o
> diff --git a/drivers/gpu/drm/tests/drm_modes_test.c b/drivers/gpu/drm/tests/drm_modes_test.c
> new file mode 100644
> index 000000000000..87d398fcb99e
> --- /dev/null
> +++ b/drivers/gpu/drm/tests/drm_modes_test.c
> @@ -0,0 +1,131 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Kunit test for drm_modes functions
> + */
> +
> +#include <kunit/test.h>
> +
> +#include <drm/drm_modes.h>
> +
> +#include "drm_kunit_helpers.h"
> +
> +struct drm_modes_test_priv {
> + struct drm_device *drm;
> +};
> +
> +static int drm_modes_test_init(struct kunit *test)
> +{
> + struct drm_modes_test_priv *priv;
> +
> + priv = kunit_kzalloc(test, sizeof(*priv), GFP_KERNEL);
> + if (!priv)
> + return -ENOMEM;
I believe it would be nicer to use KUNIT_ASSERT_NOT_NULL here, instead
of returning a error.
> + test->priv = priv;
> +
> + priv->drm = drm_kunit_device_init("drm-modes-test");
> + if (IS_ERR(priv->drm))
> + return PTR_ERR(priv->drm);
Here you could use KUNIT_ASSERT_NOT_ERR_OR_NULL.
> +
> + return 0;
> +}
> +
> +static void drm_modes_test_exit(struct kunit *test)
> +{
> + struct drm_modes_test_priv *priv = test->priv;
> +
> + drm_kunit_device_exit(priv->drm);
> +}
> +
> +static void drm_modes_analog_tv_ntsc_480i(struct kunit *test)
> +{
> + struct drm_modes_test_priv *priv = test->priv;
> + struct drm_display_mode *mode;
> +
> + mode = drm_analog_tv_mode(priv->drm,
> + DRM_MODE_TV_MODE_NTSC_M,
> + 13500 * 1000, 720, 480,
> + true);
> + KUNIT_ASSERT_NOT_NULL(test, mode);
> +
> + KUNIT_EXPECT_EQ(test, drm_mode_vrefresh(mode), 60);
> + KUNIT_EXPECT_EQ(test, mode->hdisplay, 720);
> +
> + /* 63.556us * 13.5MHz = 858 pixels */
> + KUNIT_EXPECT_EQ(test, mode->htotal, 858);
> + KUNIT_EXPECT_EQ(test, mode->vdisplay, 480);
> + KUNIT_EXPECT_EQ(test, mode->vtotal, 525);
> +}
I would be nice to see this test and drm_modes_analog_tv_pal_576i
parametrized.
Best Regards,
- Maíra Canal
> +
> +static void drm_modes_analog_tv_ntsc_480i_inlined(struct kunit *test)
> +{
> + struct drm_modes_test_priv *priv = test->priv;
> + struct drm_display_mode *expected, *mode;
> +
> + expected = drm_analog_tv_mode(priv->drm,
> + DRM_MODE_TV_MODE_NTSC_M,
> + 13500 * 1000, 720, 480,
> + true);
> + KUNIT_ASSERT_NOT_NULL(test, expected);
> +
> + mode = drm_mode_analog_ntsc_480i(priv->drm);
> + KUNIT_ASSERT_NOT_NULL(test, mode);
> +
> + KUNIT_EXPECT_TRUE(test, drm_mode_equal(expected, mode));
> +}
> +
> +static void drm_modes_analog_tv_pal_576i(struct kunit *test)
> +{
> + struct drm_modes_test_priv *priv = test->priv;
> + struct drm_display_mode *mode;
> +
> + mode = drm_analog_tv_mode(priv->drm,
> + DRM_MODE_TV_MODE_PAL_B,
> + 13500 * 1000, 720, 576,
> + true);
> + KUNIT_ASSERT_NOT_NULL(test, mode);
> +
> + KUNIT_EXPECT_EQ(test, drm_mode_vrefresh(mode), 50);
> + KUNIT_EXPECT_EQ(test, mode->hdisplay, 720);
> +
> + /* 64us * 13.5MHz = 864 pixels */
> + KUNIT_EXPECT_EQ(test, mode->htotal, 864);
> + KUNIT_EXPECT_EQ(test, mode->vdisplay, 576);
> + KUNIT_EXPECT_EQ(test, mode->vtotal, 625);
> +}
> +
> +static void drm_modes_analog_tv_pal_576i_inlined(struct kunit *test)
> +{
> + struct drm_modes_test_priv *priv = test->priv;
> + struct drm_display_mode *expected, *mode;
> +
> + expected = drm_analog_tv_mode(priv->drm,
> + DRM_MODE_TV_MODE_PAL_B,
> + 13500 * 1000, 720, 576,
> + true);
> + KUNIT_ASSERT_NOT_NULL(test, expected);
> +
> + mode = drm_mode_analog_pal_576i(priv->drm);
> + KUNIT_ASSERT_NOT_NULL(test, mode);
> +
> + KUNIT_EXPECT_TRUE(test, drm_mode_equal(expected, mode));
> +}
> +
> +static struct kunit_case drm_modes_analog_tv_tests[] = {
> + KUNIT_CASE(drm_modes_analog_tv_ntsc_480i),
> + KUNIT_CASE(drm_modes_analog_tv_ntsc_480i_inlined),
> + KUNIT_CASE(drm_modes_analog_tv_pal_576i),
> + KUNIT_CASE(drm_modes_analog_tv_pal_576i_inlined),
> + { }
> +};
> +
> +static struct kunit_suite drm_modes_analog_tv_test_suite = {
> + .name = "drm_modes_analog_tv",
> + .init = drm_modes_test_init,
> + .exit = drm_modes_test_exit,
> + .test_cases = drm_modes_analog_tv_tests,
> +};
> +
> +kunit_test_suites(
> + &drm_modes_analog_tv_test_suite
> +);
> +MODULE_LICENSE("GPL v2");
> diff --git a/include/drm/drm_modes.h b/include/drm/drm_modes.h
> index a80ae9639e96..5ccf3d51d313 100644
> --- a/include/drm/drm_modes.h
> +++ b/include/drm/drm_modes.h
> @@ -443,6 +443,23 @@ bool drm_mode_is_420_also(const struct drm_display_info *display,
> bool drm_mode_is_420(const struct drm_display_info *display,
> const struct drm_display_mode *mode);
>
> +struct drm_display_mode *drm_analog_tv_mode(struct drm_device *dev,
> + enum drm_connector_tv_mode mode,
> + unsigned long pixel_clock_hz,
> + unsigned int hdisplay,
> + unsigned int vdisplay,
> + bool interlace);
> +
> +static inline struct drm_display_mode *drm_mode_analog_ntsc_480i(struct drm_device *dev)
> +{
> + return drm_analog_tv_mode(dev, DRM_MODE_TV_MODE_NTSC_M, 13500000, 720, 480, true);
> +}
> +
> +static inline struct drm_display_mode *drm_mode_analog_pal_576i(struct drm_device *dev)
> +{
> + return drm_analog_tv_mode(dev, DRM_MODE_TV_MODE_PAL_B, 13500000, 720, 576, true);
> +}
> +
> struct drm_display_mode *drm_cvt_mode(struct drm_device *dev,
> int hdisplay, int vdisplay, int vrefresh,
> bool reduced, bool interlaced,
>
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