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Message-ID: <84bf5d8f-4c57-4557-8f96-bfcfdbd893c7@tuxedocomputers.com>
Date: Mon, 23 Jun 2025 19:45:19 +0200
From: Werner Sembach <wse@...edocomputers.com>
To: jani.nikula@...ux.intel.com, rodrigo.vivi@...el.com,
joonas.lahtinen@...ux.intel.com, tursulin@...ulin.net, airlied@...il.com,
simona@...ll.ch
Cc: intel-gfx@...ts.freedesktop.org, intel-xe@...ts.freedesktop.org,
dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] drm/i915/display: Add quirk to force backlight type
on some TUXEDO devices
gentle bump
Am 11.04.25 um 17:55 schrieb Werner Sembach:
> The display backlight on TUXEDO DX1708 and InsanityBook 15 v1 with panels
> AUO 12701 and AUO 12701 must be forced to INTEL_DP_AUX_BACKLIGHT_ON to be
> able to control the brightness.
>
> This could already be archived via a module parameter, but this patch adds
> a quirk to apply this by default on the mentioned device + panel
> combinations.
>
> Signed-off-by: Werner Sembach <wse@...edocomputers.com>
> Cc: stable@...r.kernel.org
> ---
> .../drm/i915/display/intel_dp_aux_backlight.c | 14 ++++++-
> drivers/gpu/drm/i915/display/intel_quirks.c | 42 +++++++++++++++++++
> drivers/gpu/drm/i915/display/intel_quirks.h | 1 +
> 3 files changed, 56 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c b/drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c
> index c846ef4acf5b2..0cac04c98a3e3 100644
> --- a/drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c
> +++ b/drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c
> @@ -34,12 +34,14 @@
> * for some reason.
> */
>
> +#include <drm/drm_edid.h>
> #include "i915_utils.h"
> #include "intel_backlight.h"
> #include "intel_display_core.h"
> #include "intel_display_types.h"
> #include "intel_dp.h"
> #include "intel_dp_aux_backlight.h"
> +#include "intel_quirks.h"
>
> /*
> * DP AUX registers for Intel's proprietary HDR backlight interface. We define
> @@ -607,11 +609,21 @@ int intel_dp_aux_init_backlight_funcs(struct intel_connector *connector)
> struct drm_device *dev = connector->base.dev;
> struct intel_panel *panel = &connector->panel;
> bool try_intel_interface = false, try_vesa_interface = false;
> + int enable_dpcd_backlight;
> + u32 pnl_id;
>
> /* Check the VBT and user's module parameters to figure out which
> * interfaces to probe
> */
> - switch (display->params.enable_dpcd_backlight) {
> + enable_dpcd_backlight = display->params.enable_dpcd_backlight;
> + if (enable_dpcd_backlight == INTEL_DP_AUX_BACKLIGHT_AUTO &&
> + intel_has_quirk(display, QUIRK_AUO_12701_21229_ENABLE_DPCD_BACKLIGHT)) {
> + pnl_id = drm_edid_get_panel_id(panel->fixed_edid);
> + if (pnl_id == drm_edid_encode_panel_id('A', 'U', 'O', 0x319d) ||
> + pnl_id == drm_edid_encode_panel_id('A', 'U', 'O', 0x52ed))
> + enable_dpcd_backlight = INTEL_DP_AUX_BACKLIGHT_ON;
> + }
> + switch (enable_dpcd_backlight) {
> case INTEL_DP_AUX_BACKLIGHT_OFF:
> return -ENODEV;
> case INTEL_DP_AUX_BACKLIGHT_AUTO:
> diff --git a/drivers/gpu/drm/i915/display/intel_quirks.c b/drivers/gpu/drm/i915/display/intel_quirks.c
> index 8b30e9fd936e7..6f724e5712664 100644
> --- a/drivers/gpu/drm/i915/display/intel_quirks.c
> +++ b/drivers/gpu/drm/i915/display/intel_quirks.c
> @@ -78,6 +78,12 @@ static void quirk_fw_sync_len(struct intel_dp *intel_dp)
> drm_info(display->drm, "Applying Fast Wake sync pulse count quirk\n");
> }
>
> +static void quirk_auo_12701_21229_enable_dpcd_backlight(struct intel_display *display)
> +{
> + intel_set_quirk(display, QUIRK_AUO_12701_21229_ENABLE_DPCD_BACKLIGHT);
> + drm_info(display->drm, "Applying Display AUO Model 12701 and 21229 Enable DPCD Backlight quirk\n");
> +}
> +
> struct intel_quirk {
> int device;
> int subsystem_vendor;
> @@ -118,6 +124,12 @@ static int intel_dmi_no_pps_backlight(const struct dmi_system_id *id)
> return 1;
> }
>
> +static int intel_dmi_auo_12701_21229_enable_dpcd_backlight(const struct dmi_system_id *id)
> +{
> + DRM_INFO("Display AUO model 12701 and 21229 DPCD backlight control on %s\n", id->ident);
> + return 1;
> +}
> +
> static const struct intel_dmi_quirk intel_dmi_quirks[] = {
> {
> .dmi_id_list = &(const struct dmi_system_id[]) {
> @@ -164,6 +176,36 @@ static const struct intel_dmi_quirk intel_dmi_quirks[] = {
> },
> .hook = quirk_no_pps_backlight_power_hook,
> },
> + {
> + .dmi_id_list = &(const struct dmi_system_id[]) {
> + {
> + .callback = intel_dmi_auo_12701_21229_enable_dpcd_backlight,
> + .ident = "TUXEDO DX1708",
> + .matches = {DMI_MATCH(DMI_BOARD_NAME, "N8xEJEK"),
> + },
> + },
> + {
> + .callback = intel_dmi_auo_12701_21229_enable_dpcd_backlight,
> + .ident = "TUXEDO InsanityBook 15 v1",
> + .matches = {DMI_MATCH(DMI_BOARD_NAME, "P95_HP"),
> + },
> + },
> + {
> + .callback = intel_dmi_auo_12701_21229_enable_dpcd_backlight,
> + .ident = "TUXEDO InsanityBook 15 v1",
> + .matches = {DMI_MATCH(DMI_BOARD_NAME, "P95_HR"),
> + },
> + },
> + {
> + .callback = intel_dmi_auo_12701_21229_enable_dpcd_backlight,
> + .ident = "TUXEDO InsanityBook 15 v1",
> + .matches = {DMI_MATCH(DMI_BOARD_NAME, "P95_HP,HR,HQ"),
> + },
> + },
> + { }
> + },
> + .hook = quirk_auo_12701_21229_enable_dpcd_backlight,
> + },
> };
>
> static struct intel_quirk intel_quirks[] = {
> diff --git a/drivers/gpu/drm/i915/display/intel_quirks.h b/drivers/gpu/drm/i915/display/intel_quirks.h
> index cafdebda75354..38bdbd65d7efb 100644
> --- a/drivers/gpu/drm/i915/display/intel_quirks.h
> +++ b/drivers/gpu/drm/i915/display/intel_quirks.h
> @@ -20,6 +20,7 @@ enum intel_quirk_id {
> QUIRK_LVDS_SSC_DISABLE,
> QUIRK_NO_PPS_BACKLIGHT_POWER_HOOK,
> QUIRK_FW_SYNC_LEN,
> + QUIRK_AUO_12701_21229_ENABLE_DPCD_BACKLIGHT,
> };
>
> void intel_init_quirks(struct intel_display *display);
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