The patch below does not apply to the 6.6-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.6.y git checkout FETCH_HEAD git cherry-pick -x 0ce91928ec62d189b5c51816e325f02587b53118 # <resolve conflicts, build, test, etc.> git commit -s git send-email --to 'stable@vger.kernel.org' --in-reply-to '2024080729-overlord-gala-fe40@gregkh' --subject-prefix 'PATCH 6.6.y' HEAD^..

Possible dependencies:

0ce91928ec62 ("drm/ast: astdp: Wake up during connector status detection")

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 0ce91928ec62d189b5c51816e325f02587b53118 Mon Sep 17 00:00:00 2001 From: Thomas Zimmermann tzimmermann@suse.de Date: Wed, 17 Jul 2024 16:24:16 +0200 Subject: [PATCH] drm/ast: astdp: Wake up during connector status detection

Power up the ASTDP connector for connection status detection if the connector is not active. Keep it powered if a display is attached.

This fixes a bug where the connector does not come back after disconnecting the display. The encoder's atomic_disable turns off power on the physical connector. Further HPD reads will fail, thus preventing the driver from detecting re-connected displays.

For connectors that are actively used, only test the HPD flag without touching power.

Fixes: f81bb0ac7872 ("drm/ast: report connection status on Display Port.") Cc: Jocelyn Falempe jfalempe@redhat.com Cc: Thomas Zimmermann tzimmermann@suse.de Cc: Dave Airlie airlied@redhat.com Cc: dri-devel@lists.freedesktop.org Cc: stable@vger.kernel.org # v6.6+ Signed-off-by: Thomas Zimmermann tzimmermann@suse.de Reviewed-by: Jocelyn Falempe jfalempe@redhat.com Link: https://patchwork.freedesktop.org/patch/msgid/20240717143319.104012-2-tzimme...

diff --git a/drivers/gpu/drm/ast/ast_dp.c b/drivers/gpu/drm/ast/ast_dp.c index 1e9259416980..e6c7f0d64e99 100644 --- a/drivers/gpu/drm/ast/ast_dp.c +++ b/drivers/gpu/drm/ast/ast_dp.c @@ -158,7 +158,14 @@ void ast_dp_launch(struct drm_device *dev) ASTDP_HOST_EDID_READ_DONE); }

+bool ast_dp_power_is_on(struct ast_device *ast) +{ + u8 vgacre3;

+ vgacre3 = ast_get_index_reg(ast, AST_IO_VGACRI, 0xe3); + + return !(vgacre3 & AST_DP_PHY_SLEEP); +}

void ast_dp_power_on_off(struct drm_device *dev, bool on) { diff --git a/drivers/gpu/drm/ast/ast_drv.h b/drivers/gpu/drm/ast/ast_drv.h index ba3d86973995..47bab5596c16 100644 --- a/drivers/gpu/drm/ast/ast_drv.h +++ b/drivers/gpu/drm/ast/ast_drv.h @@ -472,6 +472,7 @@ void ast_init_3rdtx(struct drm_device *dev); bool ast_astdp_is_connected(struct ast_device *ast); int ast_astdp_read_edid(struct drm_device *dev, u8 *ediddata); void ast_dp_launch(struct drm_device *dev); +bool ast_dp_power_is_on(struct ast_device *ast); void ast_dp_power_on_off(struct drm_device *dev, bool no); void ast_dp_set_on_off(struct drm_device *dev, bool no); void ast_dp_set_mode(struct drm_crtc *crtc, struct ast_vbios_mode_info *vbios_mode); diff --git a/drivers/gpu/drm/ast/ast_mode.c b/drivers/gpu/drm/ast/ast_mode.c index dc8f639e82fd..049ee1477c33 100644 --- a/drivers/gpu/drm/ast/ast_mode.c +++ b/drivers/gpu/drm/ast/ast_mode.c @@ -28,6 +28,7 @@ * Authors: Dave Airlie airlied@redhat.com */

+#include <linux/delay.h> #include <linux/export.h> #include <linux/pci.h>

@@ -1687,11 +1688,35 @@ static int ast_astdp_connector_helper_detect_ctx(struct drm_connector *connector struct drm_modeset_acquire_ctx *ctx, bool force) { + struct drm_device *dev = connector->dev; struct ast_device *ast = to_ast_device(connector->dev); + enum drm_connector_status status = connector_status_disconnected; + struct drm_connector_state *connector_state = connector->state; + bool is_active = false; + + mutex_lock(&ast->modeset_lock); + + if (connector_state && connector_state->crtc) { + struct drm_crtc_state *crtc_state = connector_state->crtc->state; + + if (crtc_state && crtc_state->active) + is_active = true; + } + + if (!is_active && !ast_dp_power_is_on(ast)) { + ast_dp_power_on_off(dev, true); + msleep(50); + }

if (ast_astdp_is_connected(ast)) - return connector_status_connected; - return connector_status_disconnected; + status = connector_status_connected; + + if (!is_active && status == connector_status_disconnected) + ast_dp_power_on_off(dev, false); + + mutex_unlock(&ast->modeset_lock); + + return status; }

static const struct drm_connector_helper_funcs ast_astdp_connector_helper_funcs = {