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Message-ID: <87y14s6gke.fsf@intel.com>
Date: Mon, 19 Aug 2024 11:51:45 +0300
From: Jani Nikula <jani.nikula@...ux.intel.com>
To: Thomas Weißschuh <linux@...ssschuh.net>, Alex Deucher
<alexander.deucher@....com>, Christian König
<christian.koenig@....com>,
Xinhui Pan <Xinhui.Pan@....com>, David Airlie <airlied@...il.com>, Daniel
Vetter <daniel@...ll.ch>
Cc: amd-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
linux-kernel@...r.kernel.org, Thomas Weißschuh
<linux@...ssschuh.net>
Subject: Re: [PATCH] drm/radeon: Switch radeon_connector to struct drm_edid
On Sun, 18 Aug 2024, Thomas Weißschuh <linux@...ssschuh.net> wrote:
> "struct drm_edid" is the safe and recommended alternative to "struct edid".
>
> Rename the member to make sure that no usage sites are missed,
> as "struct drm_edid" has some restrictions, for example it can not be
> used with kfree().
>
> Signed-off-by: Thomas Weißschuh <linux@...ssschuh.net>
> ---
> This is only compile-tested.
> ---
> drivers/gpu/drm/radeon/radeon_audio.c | 4 +--
> drivers/gpu/drm/radeon/radeon_combios.c | 4 +--
> drivers/gpu/drm/radeon/radeon_connectors.c | 54 +++++++++++++++---------------
> drivers/gpu/drm/radeon/radeon_mode.h | 5 ++-
> 4 files changed, 33 insertions(+), 34 deletions(-)
>
> diff --git a/drivers/gpu/drm/radeon/radeon_audio.c b/drivers/gpu/drm/radeon/radeon_audio.c
> index 47aa06a9a942..59d0e47c94d0 100644
> --- a/drivers/gpu/drm/radeon/radeon_audio.c
> +++ b/drivers/gpu/drm/radeon/radeon_audio.c
> @@ -311,7 +311,7 @@ static void radeon_audio_write_sad_regs(struct drm_encoder *encoder)
> if (!connector)
> return;
>
> - sad_count = drm_edid_to_sad(radeon_connector->edid, &sads);
> + sad_count = drm_edid_to_sad(drm_edid_raw(radeon_connector->drm_edid), &sads);
The drm_edid_raw() usages could use a FIXME comment; eventually we want
all of them gone too.
> if (sad_count < 0)
> DRM_ERROR("Couldn't read SADs: %d\n", sad_count);
> if (sad_count <= 0)
> @@ -335,7 +335,7 @@ static void radeon_audio_write_speaker_allocation(struct drm_encoder *encoder)
> if (!connector)
> return;
>
> - sad_count = drm_edid_to_speaker_allocation(radeon_connector->edid, &sadb);
> + sad_count = drm_edid_to_speaker_allocation(drm_edid_raw(radeon_connector->drm_edid), &sadb);
> if (sad_count < 0) {
> DRM_DEBUG("Couldn't read Speaker Allocation Data Block: %d\n",
> sad_count);
> diff --git a/drivers/gpu/drm/radeon/radeon_combios.c b/drivers/gpu/drm/radeon/radeon_combios.c
> index df8d7f56b028..f4947acd0419 100644
> --- a/drivers/gpu/drm/radeon/radeon_combios.c
> +++ b/drivers/gpu/drm/radeon/radeon_combios.c
> @@ -390,10 +390,10 @@ bool radeon_combios_check_hardcoded_edid(struct radeon_device *rdev)
> }
>
> /* this is used for atom LCDs as well */
> -struct edid *
> +const struct drm_edid *
> radeon_bios_get_hardcoded_edid(struct radeon_device *rdev)
> {
> - return drm_edid_duplicate(drm_edid_raw(rdev->mode_info.bios_hardcoded_edid));
> + return drm_edid_dup(rdev->mode_info.bios_hardcoded_edid);
> }
>
> static struct radeon_i2c_bus_rec combios_setup_i2c_bus(struct radeon_device *rdev,
> diff --git a/drivers/gpu/drm/radeon/radeon_connectors.c b/drivers/gpu/drm/radeon/radeon_connectors.c
> index 528a8f3677c2..87a78c8e09c0 100644
> --- a/drivers/gpu/drm/radeon/radeon_connectors.c
> +++ b/drivers/gpu/drm/radeon/radeon_connectors.c
> @@ -261,7 +261,7 @@ static void radeon_connector_get_edid(struct drm_connector *connector)
> struct radeon_device *rdev = dev->dev_private;
> struct radeon_connector *radeon_connector = to_radeon_connector(connector);
>
> - if (radeon_connector->edid)
> + if (radeon_connector->drm_edid)
> return;
>
> /* on hw with routers, select right port */
> @@ -271,8 +271,8 @@ static void radeon_connector_get_edid(struct drm_connector *connector)
> if ((radeon_connector_encoder_get_dp_bridge_encoder_id(connector) !=
> ENCODER_OBJECT_ID_NONE) &&
> radeon_connector->ddc_bus->has_aux) {
> - radeon_connector->edid = drm_get_edid(connector,
> - &radeon_connector->ddc_bus->aux.ddc);
> + radeon_connector->drm_edid = drm_edid_read_ddc(connector,
> + &radeon_connector->ddc_bus->aux.ddc);
> } else if ((connector->connector_type == DRM_MODE_CONNECTOR_DisplayPort) ||
> (connector->connector_type == DRM_MODE_CONNECTOR_eDP)) {
> struct radeon_connector_atom_dig *dig = radeon_connector->con_priv;
> @@ -280,22 +280,22 @@ static void radeon_connector_get_edid(struct drm_connector *connector)
> if ((dig->dp_sink_type == CONNECTOR_OBJECT_ID_DISPLAYPORT ||
> dig->dp_sink_type == CONNECTOR_OBJECT_ID_eDP) &&
> radeon_connector->ddc_bus->has_aux)
> - radeon_connector->edid = drm_get_edid(&radeon_connector->base,
> - &radeon_connector->ddc_bus->aux.ddc);
> + radeon_connector->drm_edid = drm_edid_read_ddc(&radeon_connector->base,
> + &radeon_connector->ddc_bus->aux.ddc);
> else if (radeon_connector->ddc_bus)
> - radeon_connector->edid = drm_get_edid(&radeon_connector->base,
> - &radeon_connector->ddc_bus->adapter);
> + radeon_connector->drm_edid = drm_edid_read_ddc(&radeon_connector->base,
> + &radeon_connector->ddc_bus->adapter);
> } else if (vga_switcheroo_handler_flags() & VGA_SWITCHEROO_CAN_SWITCH_DDC &&
> connector->connector_type == DRM_MODE_CONNECTOR_LVDS &&
> radeon_connector->ddc_bus) {
> - radeon_connector->edid = drm_get_edid_switcheroo(&radeon_connector->base,
> - &radeon_connector->ddc_bus->adapter);
> + radeon_connector->drm_edid = drm_edid_read_ddc(&radeon_connector->base,
> + &radeon_connector->ddc_bus->adapter);
drm_edid_read_switcheroo()!
> } else if (radeon_connector->ddc_bus) {
> - radeon_connector->edid = drm_get_edid(&radeon_connector->base,
> - &radeon_connector->ddc_bus->adapter);
> + radeon_connector->drm_edid = drm_edid_read_ddc(&radeon_connector->base,
> + &radeon_connector->ddc_bus->adapter);
> }
>
> - if (!radeon_connector->edid) {
> + if (!radeon_connector->drm_edid) {
> /* don't fetch the edid from the vbios if ddc fails and runpm is
> * enabled so we report disconnected.
> */
> @@ -306,20 +306,22 @@ static void radeon_connector_get_edid(struct drm_connector *connector)
> /* some laptops provide a hardcoded edid in rom for LCDs */
> if (((connector->connector_type == DRM_MODE_CONNECTOR_LVDS) ||
> (connector->connector_type == DRM_MODE_CONNECTOR_eDP)))
> - radeon_connector->edid = radeon_bios_get_hardcoded_edid(rdev);
> + radeon_connector->drm_edid = radeon_bios_get_hardcoded_edid(rdev);
> } else {
> /* some servers provide a hardcoded edid in rom for KVMs */
> - radeon_connector->edid = radeon_bios_get_hardcoded_edid(rdev);
> + radeon_connector->drm_edid = radeon_bios_get_hardcoded_edid(rdev);
> }
> }
> +
> + drm_edid_connector_update(&radeon_connector->base, radeon_connector->drm_edid);
> }
>
> static void radeon_connector_free_edid(struct drm_connector *connector)
> {
> struct radeon_connector *radeon_connector = to_radeon_connector(connector);
>
> - kfree(radeon_connector->edid);
> - radeon_connector->edid = NULL;
> + drm_edid_free(radeon_connector->drm_edid);
> + radeon_connector->drm_edid = NULL;
> }
>
> static int radeon_ddc_get_modes(struct drm_connector *connector)
> @@ -327,12 +329,12 @@ static int radeon_ddc_get_modes(struct drm_connector *connector)
> struct radeon_connector *radeon_connector = to_radeon_connector(connector);
> int ret;
>
> - if (radeon_connector->edid) {
> - drm_connector_update_edid_property(connector, radeon_connector->edid);
> - ret = drm_add_edid_modes(connector, radeon_connector->edid);
> + if (radeon_connector->drm_edid) {
> + drm_edid_connector_update(connector, radeon_connector->drm_edid);
> + ret = drm_edid_connector_add_modes(connector);
> return ret;
> }
> - drm_connector_update_edid_property(connector, NULL);
> + drm_edid_connector_update(connector, NULL);
The whole thing above can be simplified, as the functions handle NULL
parameters just fine.
> return 0;
> }
>
> @@ -869,7 +871,7 @@ radeon_lvds_detect(struct drm_connector *connector, bool force)
>
> /* check for edid as well */
> radeon_connector_get_edid(connector);
> - if (radeon_connector->edid)
> + if (radeon_connector->drm_edid)
> ret = connector_status_connected;
> /* check acpi lid status ??? */
>
> @@ -1012,13 +1014,12 @@ radeon_vga_detect(struct drm_connector *connector, bool force)
> radeon_connector_free_edid(connector);
> radeon_connector_get_edid(connector);
>
> - if (!radeon_connector->edid) {
> + if (!radeon_connector->drm_edid) {
> DRM_ERROR("%s: probed a monitor but no|invalid EDID\n",
> connector->name);
> ret = connector_status_connected;
> } else {
> - radeon_connector->use_digital =
> - !!(radeon_connector->edid->input & DRM_EDID_INPUT_DIGITAL);
> + radeon_connector->use_digital = drm_edid_is_digital(radeon_connector->drm_edid);
>
> /* some oems have boards with separate digital and analog connectors
> * with a shared ddc line (often vga + hdmi)
> @@ -1270,7 +1271,7 @@ radeon_dvi_detect(struct drm_connector *connector, bool force)
> radeon_connector_free_edid(connector);
> radeon_connector_get_edid(connector);
>
> - if (!radeon_connector->edid) {
> + if (!radeon_connector->drm_edid) {
> DRM_ERROR("%s: probed a monitor but no|invalid EDID\n",
> connector->name);
> /* rs690 seems to have a problem with connectors not existing and always
> @@ -1286,8 +1287,7 @@ radeon_dvi_detect(struct drm_connector *connector, bool force)
> broken_edid = true; /* defer use_digital to later */
> }
> } else {
> - radeon_connector->use_digital =
> - !!(radeon_connector->edid->input & DRM_EDID_INPUT_DIGITAL);
> + radeon_connector->use_digital = drm_edid_is_digital(radeon_connector->drm_edid);
>
> /* some oems have boards with separate digital and analog connectors
> * with a shared ddc line (often vga + hdmi)
> diff --git a/drivers/gpu/drm/radeon/radeon_mode.h b/drivers/gpu/drm/radeon/radeon_mode.h
> index 421c83fc70dc..ae1d91cd93ec 100644
> --- a/drivers/gpu/drm/radeon/radeon_mode.h
> +++ b/drivers/gpu/drm/radeon/radeon_mode.h
> @@ -38,7 +38,6 @@
> #include <linux/i2c.h>
> #include <linux/i2c-algo-bit.h>
>
> -struct edid;
> struct drm_edid;
> struct radeon_bo;
> struct radeon_device;
> @@ -521,7 +520,7 @@ struct radeon_connector {
> bool use_digital;
> /* we need to mind the EDID between detect
> and get modes due to analog/digital/tvencoder */
> - struct edid *edid;
> + const struct drm_edid *drm_edid;
> void *con_priv;
> bool dac_load_detect;
> bool detected_by_load; /* if the connection status was determined by load */
> @@ -843,7 +842,7 @@ radeon_get_crtc_scanout_position(struct drm_crtc *crtc, bool in_vblank_irq,
> const struct drm_display_mode *mode);
>
> extern bool radeon_combios_check_hardcoded_edid(struct radeon_device *rdev);
> -extern struct edid *
> +extern const struct drm_edid *
> radeon_bios_get_hardcoded_edid(struct radeon_device *rdev);
> extern bool radeon_atom_get_clock_info(struct drm_device *dev);
> extern bool radeon_combios_get_clock_info(struct drm_device *dev);
>
> ---
> base-commit: 19cff16559a4f2d763faf4f8392bf86d3a21b93c
> change-id: 20240818-radeon-drm_edid-9f0cec36e227
>
> Best regards,
--
Jani Nikula, Intel
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