Enable 4K / Ultrawide on Radeon HD6570 - HDMI TMDS overlocking

0001-Apply-patch-to-enable-overclocking-of-HDMI-TMDS-Spee.patch

From 6b5a119c8a15f87bbbed809840873d24d5ae57f5 Mon Sep 17 00:00:00 2001
From: James Hendry <jameshendry05@gmail.com>
Date: Mon, 3 Apr 2023 10:10:57 +0100
Subject: [PATCH 1/2] Apply patch to enable overclocking of HDMI TMDS Speed
 https://www.elstel.org/software/hunt-for-4K-UHD-2160p.html.en

---
 drivers/gpu/drm/radeon/radeon.h            |  1 +
 drivers/gpu/drm/radeon/radeon_connectors.c | 21 +++++++++++++++------
 drivers/gpu/drm/radeon/radeon_drv.c        |  4 ++++
 drivers/gpu/drm/radeon/radeon_encoders.c   |  3 +++
 4 files changed, 23 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/radeon/radeon.h b/drivers/gpu/drm/radeon/radeon.h
index 2e7161acd443..395274270e47 100644
--- a/drivers/gpu/drm/radeon/radeon.h
+++ b/drivers/gpu/drm/radeon/radeon.h
@@ -121,6 +121,7 @@ extern int radeon_uvd;
 extern int radeon_vce;
 extern int radeon_si_support;
 extern int radeon_cik_support;
+extern int radeon_hdmimhz;
 
 /*
  * Copy from radeon_drv.h so we don't have to include both and have conflicting
diff --git a/drivers/gpu/drm/radeon/radeon_connectors.c b/drivers/gpu/drm/radeon/radeon_connectors.c
index f7431d224604..0fcef68664a0 100644
--- a/drivers/gpu/drm/radeon/radeon_connectors.c
+++ b/drivers/gpu/drm/radeon/radeon_connectors.c
@@ -42,6 +42,7 @@ void radeon_connector_hotplug(struct drm_connector *connector)
 	struct drm_device *dev = connector->dev;
 	struct radeon_device *rdev = dev->dev_private;
 	struct radeon_connector *radeon_connector = to_radeon_connector(connector);
+	int mode_valid = MODE_OK;
 
 	/* bail if the connector does not have hpd pin, e.g.,
 	 * VGA, TV, etc.
@@ -1465,7 +1466,7 @@ static enum drm_mode_status radeon_dvi_mode_valid(struct drm_connector *connecto
 	struct drm_device *dev = connector->dev;
 	struct radeon_device *rdev = dev->dev_private;
 	struct radeon_connector *radeon_connector = to_radeon_connector(connector);
-
+        int mode_valid = MODE_OK;
 	/* XXX check mode bandwidth */
 
 	/* clocks over 135 MHz have heat issues with DVI on RV100 */
@@ -1482,19 +1483,27 @@ static enum drm_mode_status radeon_dvi_mode_valid(struct drm_connector *connecto
 		else if (ASIC_IS_DCE6(rdev) && drm_detect_hdmi_monitor(radeon_connector_edid(connector))) {
 			/* HDMI 1.3+ supports max clock of 340 Mhz */
 			if (mode->clock > 340000)
-				return MODE_CLOCK_HIGH;
+				mode_valid = MODE_CLOCK_HIGH;
+				//return MODE_CLOCK_HIGH;
 			else
 				return MODE_OK;
 		} else {
-			return MODE_CLOCK_HIGH;
+			mode_valid = MODE_CLOCK_HIGH;
+			//return MODE_CLOCK_HIGH;
 		}
 	}
 
+	// OUR MODIFICATION:
+	if ( radeon_hdmimhz > 0 && ( mode->clock <= radeon_hdmihz * 1000) )
+		mode_valid = MODE_OK; // Permit mode if we explicity allow it.
+
 	/* check against the max pixel clock */
-	if ((mode->clock / 10) > rdev->clock.max_pixel_clock)
-		return MODE_CLOCK_HIGH;
+	//if ((mode->clock / 10) > rdev->clock.max_pixel_clock)
+	//	return MODE_CLOCK_HIGH;
+	if ( mode_valid == MODE_OK && (mode->clock / 10) > rdev->clock.max_pixel_clock )
+		mode_valid = MODE_CLOCK_HIGH
 
-	return MODE_OK;
+	return mode_valid;
 }
 
 static const struct drm_connector_helper_funcs radeon_dvi_connector_helper_funcs = {
diff --git a/drivers/gpu/drm/radeon/radeon_drv.c b/drivers/gpu/drm/radeon/radeon_drv.c
index 6cbe1ab81aba..2c5f03738185 100644
--- a/drivers/gpu/drm/radeon/radeon_drv.c
+++ b/drivers/gpu/drm/radeon/radeon_drv.c
@@ -174,6 +174,7 @@ int radeon_backlight = -1;
 int radeon_auxch = -1;
 int radeon_uvd = 1;
 int radeon_vce = 1;
+int radeon_hdmihz = 0;
 
 MODULE_PARM_DESC(no_wb, "Disable AGP writeback for scratch registers");
 module_param_named(no_wb, radeon_no_wb, int, 0444);
@@ -268,6 +269,9 @@ module_param_named(uvd, radeon_uvd, int, 0444);
 MODULE_PARM_DESC(vce, "vce enable/disable vce support (1 = enable, 0 = disable)");
 module_param_named(vce, radeon_vce, int, 0444);
 
+MODULE_PARM_DESC(hdmihz, "Force a maximum HDMI pixel clock (in MHz); try 165/225/297/330 to overclock your TMDS for gaining a higher resolution");
+module_param_named(hdmihz, radeon_hdmimhz, int, 0444);
+
 int radeon_si_support = 1;
 MODULE_PARM_DESC(si_support, "SI support (1 = enabled (default), 0 = disabled)");
 module_param_named(si_support, radeon_si_support, int, 0444);
diff --git a/drivers/gpu/drm/radeon/radeon_encoders.c b/drivers/gpu/drm/radeon/radeon_encoders.c
index fbc0a2182318..b355c9138a9a 100644
--- a/drivers/gpu/drm/radeon/radeon_encoders.c
+++ b/drivers/gpu/drm/radeon/radeon_encoders.c
@@ -370,6 +370,9 @@ bool radeon_dig_monitor_is_duallink(struct drm_encoder *encoder,
 	struct radeon_connector *radeon_connector;
 	struct radeon_connector_atom_dig *dig_connector;
 
+	if (radeon_hdmihz > 0)
+		return false;
+
 	connector = radeon_get_connector_for_encoder(encoder);
 	/* if we don't have an active device yet, just use one of
 	 * the connectors tied to the encoder.
-- 
2.39.2

0002-Make-it-work-through-DisplayPort-and-add-a-logging-l.patch

From 3865f91d36818122c8c751ec023499e365bfd013 Mon Sep 17 00:00:00 2001
From: James Hendry <jameshendry05@gmail.com>
Date: Mon, 3 Apr 2023 16:41:24 +0100
Subject: [PATCH 2/2] Make it work through DisplayPort and add a logging line

---
 drivers/gpu/drm/drm_modes.c                |  5 +++--
 drivers/gpu/drm/radeon/radeon_connectors.c | 10 ++++++----
 drivers/gpu/drm/radeon/radeon_drv.c        |  6 +++---
 drivers/gpu/drm/radeon/radeon_encoders.c   |  2 +-
 4 files changed, 13 insertions(+), 10 deletions(-)

diff --git a/drivers/gpu/drm/drm_modes.c b/drivers/gpu/drm/drm_modes.c
index 3c8034a8c27b..ed41a5f80bd8 100644
--- a/drivers/gpu/drm/drm_modes.c
+++ b/drivers/gpu/drm/drm_modes.c
@@ -1331,10 +1331,11 @@ void drm_mode_prune_invalid(struct drm_device *dev,
 		if (mode->status != MODE_OK) {
 			list_del(&mode->head);
 			if (mode->type & DRM_MODE_TYPE_USERDEF) {
-				drm_warn(dev, "User-defined mode not supported: "
+				drm_warn(dev, "User-defined mode not supported:  "
 					 DRM_MODE_FMT "\n", DRM_MODE_ARG(mode));
+				drm_warn(dev, "Because %s for mode: %s\n", mode->name, drm_get_mode_status_name(mode->status));
 			}
-			if (verbose) {
+			if (true) {
 				drm_mode_debug_printmodeline(mode);
 				DRM_DEBUG_KMS("Not using %s mode: %s\n",
 					      mode->name,
diff --git a/drivers/gpu/drm/radeon/radeon_connectors.c b/drivers/gpu/drm/radeon/radeon_connectors.c
index 0fcef68664a0..0d2730a66610 100644
--- a/drivers/gpu/drm/radeon/radeon_connectors.c
+++ b/drivers/gpu/drm/radeon/radeon_connectors.c
@@ -1494,14 +1494,14 @@ static enum drm_mode_status radeon_dvi_mode_valid(struct drm_connector *connecto
 	}
 
 	// OUR MODIFICATION:
-	if ( radeon_hdmimhz > 0 && ( mode->clock <= radeon_hdmihz * 1000) )
+	if ( radeon_hdmimhz > 0 && ( mode->clock <= radeon_hdmimhz * 1000) )
 		mode_valid = MODE_OK; // Permit mode if we explicity allow it.
 
 	/* check against the max pixel clock */
 	//if ((mode->clock / 10) > rdev->clock.max_pixel_clock)
 	//	return MODE_CLOCK_HIGH;
 	if ( mode_valid == MODE_OK && (mode->clock / 10) > rdev->clock.max_pixel_clock )
-		mode_valid = MODE_CLOCK_HIGH
+		mode_valid = MODE_CLOCK_HIGH;
 
 	return mode_valid;
 }
@@ -1789,8 +1789,10 @@ static enum drm_mode_status radeon_dp_mode_valid(struct drm_connector *connector
 				if (mode->clock > 340000)
 					return MODE_CLOCK_HIGH;
 			} else {
-				if (mode->clock > 165000)
-					return MODE_CLOCK_HIGH;
+				if (mode->clock > 165000) {
+					if (radeon_hdmimhz == 0 || (radeon_hdmimhz * 1000) < mode->clock)
+						return MODE_CLOCK_HIGH;		
+				}
 			}
 		}
 	}
diff --git a/drivers/gpu/drm/radeon/radeon_drv.c b/drivers/gpu/drm/radeon/radeon_drv.c
index 2c5f03738185..b1789a7ff023 100644
--- a/drivers/gpu/drm/radeon/radeon_drv.c
+++ b/drivers/gpu/drm/radeon/radeon_drv.c
@@ -174,7 +174,7 @@ int radeon_backlight = -1;
 int radeon_auxch = -1;
 int radeon_uvd = 1;
 int radeon_vce = 1;
-int radeon_hdmihz = 0;
+int radeon_hdmimhz = 0;
 
 MODULE_PARM_DESC(no_wb, "Disable AGP writeback for scratch registers");
 module_param_named(no_wb, radeon_no_wb, int, 0444);
@@ -269,8 +269,8 @@ module_param_named(uvd, radeon_uvd, int, 0444);
 MODULE_PARM_DESC(vce, "vce enable/disable vce support (1 = enable, 0 = disable)");
 module_param_named(vce, radeon_vce, int, 0444);
 
-MODULE_PARM_DESC(hdmihz, "Force a maximum HDMI pixel clock (in MHz); try 165/225/297/330 to overclock your TMDS for gaining a higher resolution");
-module_param_named(hdmihz, radeon_hdmimhz, int, 0444);
+MODULE_PARM_DESC(hdmimhz, "Force a maximum HDMI pixel clock (in MHz); try 165/225/297/330 to overclock your TMDS for gaining a higher resolution");
+module_param_named(hdmimhz, radeon_hdmimhz, int, 0444);
 
 int radeon_si_support = 1;
 MODULE_PARM_DESC(si_support, "SI support (1 = enabled (default), 0 = disabled)");
diff --git a/drivers/gpu/drm/radeon/radeon_encoders.c b/drivers/gpu/drm/radeon/radeon_encoders.c
index b355c9138a9a..104e758607de 100644
--- a/drivers/gpu/drm/radeon/radeon_encoders.c
+++ b/drivers/gpu/drm/radeon/radeon_encoders.c
@@ -370,7 +370,7 @@ bool radeon_dig_monitor_is_duallink(struct drm_encoder *encoder,
 	struct radeon_connector *radeon_connector;
 	struct radeon_connector_atom_dig *dig_connector;
 
-	if (radeon_hdmihz > 0)
+	if (radeon_hdmimhz > 0)
 		return false;
 
 	connector = radeon_get_connector_for_encoder(encoder);
-- 
2.39.2