drm: adv7511: Add hpd_override_enable variable to struct adv7511_chip_info

As per spec, it is allowed to pulse the HPD signal to indicate that the
EDID information has changed. Some monitors do this when they wake up
from standby or are enabled. When the HPD goes low the adv7511 is
reset and the outputs are disabled which might cause the monitor to
go to standby again. To avoid this we ignore the HPD pin for the
first few seconds after enabling the output. On the other hand,
adv7535 require to enable HPD Override bit for proper HPD.

Add hpd_override_enable variable to struct adv7511_chip_info to handle
this scenario.
Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
Reviewed-by: Robert Foss <rfoss@kernel.org>
Signed-off-by: Robert Foss <rfoss@kernel.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20230830142358.275459-9-biju.das.jz@bp.renesas.com

drivers/gpu/drm/bridge/adv7511/adv7511.h

@@ -342,6 +342,7 @@ struct adv7511_chip_info {
 	unsigned int reg_cec_offset;
 	bool has_dsi;
 	bool link_config;
+	bool hpd_override_enable;
 };
 
 struct adv7511 {

drivers/gpu/drm/bridge/adv7511/adv7511_drv.c

@@ -354,7 +354,7 @@ static void __adv7511_power_on(struct adv7511 *adv7511)
 	 * first few seconds after enabling the output. On the other hand
 	 * adv7535 require to enable HPD Override bit for proper HPD.
 	 */
-	if (adv7511->info->type == ADV7535)
+	if (adv7511->info->hpd_override_enable)
 		regmap_update_bits(adv7511->regmap, ADV7511_REG_POWER2,
 				   ADV7535_REG_POWER2_HPD_OVERRIDE,
 				   ADV7535_REG_POWER2_HPD_OVERRIDE);
@@ -381,7 +381,7 @@ static void adv7511_power_on(struct adv7511 *adv7511)
 static void __adv7511_power_off(struct adv7511 *adv7511)
 {
 	/* TODO: setup additional power down modes */
-	if (adv7511->info->type == ADV7535)
+	if (adv7511->info->hpd_override_enable)
 		regmap_update_bits(adv7511->regmap, ADV7511_REG_POWER2,
 				   ADV7535_REG_POWER2_HPD_OVERRIDE, 0);
 
@@ -682,7 +682,7 @@ adv7511_detect(struct adv7511 *adv7511, struct drm_connector *connector)
 			status = connector_status_disconnected;
 	} else {
 		/* Renable HPD sensing */
-		if (adv7511->info->type == ADV7535)
+		if (adv7511->info->hpd_override_enable)
 			regmap_update_bits(adv7511->regmap, ADV7511_REG_POWER2,
 					   ADV7535_REG_POWER2_HPD_OVERRIDE,
 					   ADV7535_REG_POWER2_HPD_OVERRIDE);
@@ -1379,6 +1379,7 @@ static const struct adv7511_chip_info adv7535_chip_info = {
 	.num_supplies = ARRAY_SIZE(adv7533_supply_names),
 	.reg_cec_offset = ADV7533_REG_CEC_OFFSET,
 	.has_dsi = true,
+	.hpd_override_enable = true,
 };
 
 static const struct i2c_device_id adv7511_i2c_ids[] = {