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Date:   Tue, 13 Aug 2019 15:01:58 +0200
From:   Daniel Vetter <daniel@ffwll.ch>
To:     Lyude Paul <lyude@redhat.com>
Cc:     dri-devel@lists.freedesktop.org, Juston Li <juston.li@intel.com>,
        Imre Deak <imre.deak@intel.com>,
        Ville =?iso-8859-1?Q?Syrj=E4l=E4?= 
        <ville.syrjala@linux.intel.com>, Harry Wentland <hwentlan@amd.com>,
        Maarten Lankhorst <maarten.lankhorst@linux.intel.com>,
        Maxime Ripard <maxime.ripard@bootlin.com>,
        Sean Paul <sean@poorly.run>, David Airlie <airlied@linux.ie>,
        Daniel Vetter <daniel@ffwll.ch>,
        Thomas Hellstrom <thellstrom@vmware.com>,
        Deepak Rawat <drawat@vmware.com>,
        Alexandru Gheorghe <alexandru-cosmin.gheorghe@arm.com>,
        Thomas Gleixner <tglx@linutronix.de>,
        linux-kernel@vger.kernel.org
Subject: Re: [PATCH 03/26] drm/dp_mst: Move test_calc_pbn_mode() into an
 actual selftest
Message-ID: <20190813130158.GT7444@phenom.ffwll.local>
Mail-Followup-To: Lyude Paul <lyude@redhat.com>,
        dri-devel@lists.freedesktop.org, Juston Li <juston.li@intel.com>,
        Imre Deak <imre.deak@intel.com>,
        Ville =?iso-8859-1?Q?Syrj=E4l=E4?= <ville.syrjala@linux.intel.com>,
        Harry Wentland <hwentlan@amd.com>,
        Maarten Lankhorst <maarten.lankhorst@linux.intel.com>,
        Maxime Ripard <maxime.ripard@bootlin.com>,
        Sean Paul <sean@poorly.run>, David Airlie <airlied@linux.ie>,
        Thomas Hellstrom <thellstrom@vmware.com>,
        Deepak Rawat <drawat@vmware.com>,
        Alexandru Gheorghe <alexandru-cosmin.gheorghe@arm.com>,
        Thomas Gleixner <tglx@linutronix.de>, linux-kernel@vger.kernel.org
References: <20190718014329.8107-1-lyude@redhat.com>
 <20190718014329.8107-4-lyude@redhat.com>
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On Wed, Jul 17, 2019 at 09:42:26PM -0400, Lyude Paul wrote:
> Yes, apparently we've been testing this for every single driver load for
> quite a long time now. At least that means our PBN calculation is solid!
> 
> Anyway, introduce self tests for MST and move this into there.
> 
> Cc: Juston Li <juston.li@intel.com>
> Cc: Imre Deak <imre.deak@intel.com>
> Cc: Ville Syrj?l? <ville.syrjala@linux.intel.com>
> Cc: Harry Wentland <hwentlan@amd.com>
> Signed-off-by: Lyude Paul <lyude@redhat.com>

More official unit tests, yay!

Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>


> ---
>  drivers/gpu/drm/drm_dp_mst_topology.c         | 27 --------------
>  drivers/gpu/drm/selftests/Makefile            |  2 +-
>  .../gpu/drm/selftests/drm_modeset_selftests.h |  1 +
>  .../drm/selftests/test-drm_dp_mst_helper.c    | 36 +++++++++++++++++++
>  .../drm/selftests/test-drm_modeset_common.h   |  1 +
>  5 files changed, 39 insertions(+), 28 deletions(-)
>  create mode 100644 drivers/gpu/drm/selftests/test-drm_dp_mst_helper.c
> 
> diff --git a/drivers/gpu/drm/drm_dp_mst_topology.c b/drivers/gpu/drm/drm_dp_mst_topology.c
> index d7c3d9233834..9e382117896d 100644
> --- a/drivers/gpu/drm/drm_dp_mst_topology.c
> +++ b/drivers/gpu/drm/drm_dp_mst_topology.c
> @@ -45,7 +45,6 @@
>   */
>  static bool dump_dp_payload_table(struct drm_dp_mst_topology_mgr *mgr,
>  				  char *buf);
> -static int test_calc_pbn_mode(void);
>  
>  static void drm_dp_mst_topology_put_port(struct drm_dp_mst_port *port);
>  
> @@ -3439,30 +3438,6 @@ int drm_dp_calc_pbn_mode(int clock, int bpp)
>  }
>  EXPORT_SYMBOL(drm_dp_calc_pbn_mode);
>  
> -static int test_calc_pbn_mode(void)
> -{
> -	int ret;
> -	ret = drm_dp_calc_pbn_mode(154000, 30);
> -	if (ret != 689) {
> -		DRM_ERROR("PBN calculation test failed - clock %d, bpp %d, expected PBN %d, actual PBN %d.\n",
> -				154000, 30, 689, ret);
> -		return -EINVAL;
> -	}
> -	ret = drm_dp_calc_pbn_mode(234000, 30);
> -	if (ret != 1047) {
> -		DRM_ERROR("PBN calculation test failed - clock %d, bpp %d, expected PBN %d, actual PBN %d.\n",
> -				234000, 30, 1047, ret);
> -		return -EINVAL;
> -	}
> -	ret = drm_dp_calc_pbn_mode(297000, 24);
> -	if (ret != 1063) {
> -		DRM_ERROR("PBN calculation test failed - clock %d, bpp %d, expected PBN %d, actual PBN %d.\n",
> -				297000, 24, 1063, ret);
> -		return -EINVAL;
> -	}
> -	return 0;
> -}
> -
>  /* we want to kick the TX after we've ack the up/down IRQs. */
>  static void drm_dp_mst_kick_tx(struct drm_dp_mst_topology_mgr *mgr)
>  {
> @@ -3898,8 +3873,6 @@ int drm_dp_mst_topology_mgr_init(struct drm_dp_mst_topology_mgr *mgr,
>  	if (!mgr->proposed_vcpis)
>  		return -ENOMEM;
>  	set_bit(0, &mgr->payload_mask);
> -	if (test_calc_pbn_mode() < 0)
> -		DRM_ERROR("MST PBN self-test failed\n");
>  
>  	mst_state = kzalloc(sizeof(*mst_state), GFP_KERNEL);
>  	if (mst_state == NULL)
> diff --git a/drivers/gpu/drm/selftests/Makefile b/drivers/gpu/drm/selftests/Makefile
> index aae88f8a016c..d2137342b371 100644
> --- a/drivers/gpu/drm/selftests/Makefile
> +++ b/drivers/gpu/drm/selftests/Makefile
> @@ -1,6 +1,6 @@
>  # SPDX-License-Identifier: GPL-2.0-only
>  test-drm_modeset-y := test-drm_modeset_common.o test-drm_plane_helper.o \
>                        test-drm_format.o test-drm_framebuffer.o \
> -		      test-drm_damage_helper.o
> +		      test-drm_damage_helper.o test-drm_dp_mst_helper.o
>  
>  obj-$(CONFIG_DRM_DEBUG_SELFTEST) += test-drm_mm.o test-drm_modeset.o test-drm_cmdline_parser.o
> diff --git a/drivers/gpu/drm/selftests/drm_modeset_selftests.h b/drivers/gpu/drm/selftests/drm_modeset_selftests.h
> index 464753746013..dec3ee3ec96f 100644
> --- a/drivers/gpu/drm/selftests/drm_modeset_selftests.h
> +++ b/drivers/gpu/drm/selftests/drm_modeset_selftests.h
> @@ -32,3 +32,4 @@ selftest(damage_iter_damage_one_intersect, igt_damage_iter_damage_one_intersect)
>  selftest(damage_iter_damage_one_outside, igt_damage_iter_damage_one_outside)
>  selftest(damage_iter_damage_src_moved, igt_damage_iter_damage_src_moved)
>  selftest(damage_iter_damage_not_visible, igt_damage_iter_damage_not_visible)
> +selftest(dp_mst_calc_pbn_mode, igt_dp_mst_calc_pbn_mode)
> diff --git a/drivers/gpu/drm/selftests/test-drm_dp_mst_helper.c b/drivers/gpu/drm/selftests/test-drm_dp_mst_helper.c
> new file mode 100644
> index 000000000000..51b2486ec917
> --- /dev/null
> +++ b/drivers/gpu/drm/selftests/test-drm_dp_mst_helper.c
> @@ -0,0 +1,36 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * Test cases for for the DRM DP MST helpers
> + */
> +
> +#define pr_fmt(fmt) "drm_dp_mst_helper: " fmt
> +
> +#include <drm/drm_dp_mst_helper.h>
> +#include <drm/drm_print.h>
> +
> +#include "test-drm_modeset_common.h"
> +
> +int igt_dp_mst_calc_pbn_mode(void *ignored)
> +{
> +	int pbn, i;
> +	const struct {
> +		int rate;
> +		int bpp;
> +		int expected;
> +	} test_params[] = {
> +		{ 154000, 30, 689 },
> +		{ 234000, 30, 1047 },
> +		{ 297000, 24, 1063 },
> +	};
> +
> +	for (i = 0; i < ARRAY_SIZE(test_params); i++) {
> +		pbn = drm_dp_calc_pbn_mode(test_params[i].rate,
> +					   test_params[i].bpp);
> +		FAIL(pbn != test_params[i].expected,
> +		     "Expected PBN %d for clock %d bpp %d, got %d\n",
> +		     test_params[i].expected, test_params[i].rate,
> +		     test_params[i].bpp, pbn);
> +	}
> +
> +	return 0;
> +}
> diff --git a/drivers/gpu/drm/selftests/test-drm_modeset_common.h b/drivers/gpu/drm/selftests/test-drm_modeset_common.h
> index 8c76f09c12d1..590bda35a683 100644
> --- a/drivers/gpu/drm/selftests/test-drm_modeset_common.h
> +++ b/drivers/gpu/drm/selftests/test-drm_modeset_common.h
> @@ -39,5 +39,6 @@ int igt_damage_iter_damage_one_intersect(void *ignored);
>  int igt_damage_iter_damage_one_outside(void *ignored);
>  int igt_damage_iter_damage_src_moved(void *ignored);
>  int igt_damage_iter_damage_not_visible(void *ignored);
> +int igt_dp_mst_calc_pbn_mode(void *ignored);
>  
>  #endif
> -- 
> 2.21.0
> 

-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch