Re: [PATCH v4 12/12] drm/ast: Implement polling for VGA and SIL164 connectors

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Hi

Am 19.03.24 um 10:37 schrieb Maxime Ripard:
Hi,

On Tue, Mar 19, 2024 at 09:00:32AM +0100, Thomas Zimmermann wrote:
Implement polling for VGA and SIL164 connectors. Set the flag
DRM_CONNECTOR_POLL_DISCONNECT for each to detect the removal of the
monitor cable. Implement struct drm_connector_helper_funcs.detect_ctx
for each type of connector by testing for EDID data. The code for
both types of connectors is identical for now. Maybe this can later
become a common helper function for various drivers.

Signed-off-by: Thomas Zimmermann <tzimmermann@xxxxxxx>
---
  drivers/gpu/drm/ast/ast_mode.c | 36 ++++++++++++++++++++++++++++++++--
  1 file changed, 34 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/ast/ast_mode.c b/drivers/gpu/drm/ast/ast_mode.c
index 71cc681d6188f..f740b8706a38b 100644
--- a/drivers/gpu/drm/ast/ast_mode.c
+++ b/drivers/gpu/drm/ast/ast_mode.c
@@ -1344,8 +1344,24 @@ static int ast_crtc_init(struct drm_device *dev)
   * VGA Connector
   */
+static int ast_vga_connector_helper_detect_ctx(struct drm_connector *connector,
+					       struct drm_modeset_acquire_ctx *ctx,
+					       bool force)
+{
+	enum drm_connector_status status = connector_status_disconnected;
+	const struct drm_edid *edid;
+
+	edid = drm_edid_read(connector);
+	if (edid)
+		status = connector_status_connected;
+	drm_edid_free(edid);
+
+	return status;
+}
+
Yeah, I think it would be worth turning it into a helper. We have a
number of drivers using some variation of that already
(display-connector, loongson).

It's probably better to use drm_probe_ddc here too instead of parsing
and updating the EDID property each time we call detect.

I see. I'll update the patch accordingly. drm_probe_ddc() doesn't update the property, which is probably better anyway.

Best regard
Thomas


Maxime

--
--
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Frankenstrasse 146, 90461 Nuernberg, Germany
GF: Ivo Totev, Andrew Myers, Andrew McDonald, Boudien Moerman
HRB 36809 (AG Nuernberg)




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