linux-kernel - [PATCH v2 02/36] drm/vc4: Fix reading of frame count on GEN5 / Pi4

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Message-Id: <20241025-drm-vc4-2712-support-v2-2-35efa83c8fc0@raspberrypi.com>
Date: Fri, 25 Oct 2024 18:15:33 +0100
From: Dave Stevenson <dave.stevenson@...pberrypi.com>
To: Maxime Ripard <mripard@...nel.org>, 
 Maíra Canal <mcanal@...lia.com>, 
 Raspberry Pi Kernel Maintenance <kernel-list@...pberrypi.com>, 
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, 
 Thomas Zimmermann <tzimmermann@...e.de>, David Airlie <airlied@...il.com>, 
 Simona Vetter <simona@...ll.ch>, Rob Herring <robh@...nel.org>, 
 Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, 
 Florian Fainelli <florian.fainelli@...adcom.com>, 
 Broadcom internal kernel review list <bcm-kernel-feedback-list@...adcom.com>, 
 Ray Jui <rjui@...adcom.com>, Scott Branden <sbranden@...adcom.com>, 
 Michael Turquette <mturquette@...libre.com>, 
 Stephen Boyd <sboyd@...nel.org>, 
 Javier Martinez Canillas <javierm@...hat.com>, 
 Catalin Marinas <catalin.marinas@....com>, Will Deacon <will@...nel.org>
Cc: dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org, 
 devicetree@...r.kernel.org, linux-rpi-kernel@...ts.infradead.org, 
 linux-arm-kernel@...ts.infradead.org, linux-clk@...r.kernel.org, 
 Dave Stevenson <dave.stevenson@...pberrypi.com>
Subject: [PATCH v2 02/36] drm/vc4: Fix reading of frame count on GEN5 / Pi4

The frame count values moved within registers DISPSTAT1 and
DISPSTAT2 with GEN5, so update the accessor function to
accommodate that.

Fixes: b51cd7ad143d ("drm/vc4: hvs: Fix frame count register readout")
Signed-off-by: Dave Stevenson <dave.stevenson@...pberrypi.com>
Reviewed-by: Maxime Ripard <mripard@...nel.org>
---
 drivers/gpu/drm/vc4/vc4_hvs.c  | 45 +++++++++++++++++++++++++++++++-----------
 drivers/gpu/drm/vc4/vc4_regs.h |  6 ++++++
 2 files changed, 40 insertions(+), 11 deletions(-)

diff --git a/drivers/gpu/drm/vc4/vc4_hvs.c b/drivers/gpu/drm/vc4/vc4_hvs.c
index 1edf6e3fa7e6..f8edb0791091 100644
--- a/drivers/gpu/drm/vc4/vc4_hvs.c
+++ b/drivers/gpu/drm/vc4/vc4_hvs.c
@@ -272,19 +272,42 @@ u8 vc4_hvs_get_fifo_frame_count(struct vc4_hvs *hvs, unsigned int fifo)
 	if (!drm_dev_enter(drm, &idx))
 		return 0;
 
-	switch (fifo) {
-	case 0:
-		field = VC4_GET_FIELD(HVS_READ(SCALER_DISPSTAT1),
-				      SCALER_DISPSTAT1_FRCNT0);
-		break;
-	case 1:
-		field = VC4_GET_FIELD(HVS_READ(SCALER_DISPSTAT1),
-				      SCALER_DISPSTAT1_FRCNT1);
+	switch (vc4->gen) {
+	case VC4_GEN_5:
+		switch (fifo) {
+		case 0:
+			field = VC4_GET_FIELD(HVS_READ(SCALER_DISPSTAT1),
+					      SCALER5_DISPSTAT1_FRCNT0);
+			break;
+		case 1:
+			field = VC4_GET_FIELD(HVS_READ(SCALER_DISPSTAT1),
+					      SCALER5_DISPSTAT1_FRCNT1);
+			break;
+		case 2:
+			field = VC4_GET_FIELD(HVS_READ(SCALER_DISPSTAT2),
+					      SCALER5_DISPSTAT2_FRCNT2);
+			break;
+		}
 		break;
-	case 2:
-		field = VC4_GET_FIELD(HVS_READ(SCALER_DISPSTAT2),
-				      SCALER_DISPSTAT2_FRCNT2);
+	case VC4_GEN_4:
+		switch (fifo) {
+		case 0:
+			field = VC4_GET_FIELD(HVS_READ(SCALER_DISPSTAT1),
+					      SCALER_DISPSTAT1_FRCNT0);
+			break;
+		case 1:
+			field = VC4_GET_FIELD(HVS_READ(SCALER_DISPSTAT1),
+					      SCALER_DISPSTAT1_FRCNT1);
+			break;
+		case 2:
+			field = VC4_GET_FIELD(HVS_READ(SCALER_DISPSTAT2),
+					      SCALER_DISPSTAT2_FRCNT2);
+			break;
+		}
 		break;
+	default:
+		drm_err(drm, "Unknown VC4 generation: %d", vc4->gen);
+		return 0;
 	}
 
 	drm_dev_exit(idx);
diff --git a/drivers/gpu/drm/vc4/vc4_regs.h b/drivers/gpu/drm/vc4/vc4_regs.h
index c55dec383929..341a75cf92e5 100644
--- a/drivers/gpu/drm/vc4/vc4_regs.h
+++ b/drivers/gpu/drm/vc4/vc4_regs.h
@@ -418,6 +418,10 @@
 # define SCALER_DISPSTAT1_FRCNT0_SHIFT		18
 # define SCALER_DISPSTAT1_FRCNT1_MASK		VC4_MASK(17, 12)
 # define SCALER_DISPSTAT1_FRCNT1_SHIFT		12
+# define SCALER5_DISPSTAT1_FRCNT0_MASK		VC4_MASK(25, 20)
+# define SCALER5_DISPSTAT1_FRCNT0_SHIFT		20
+# define SCALER5_DISPSTAT1_FRCNT1_MASK		VC4_MASK(19, 14)
+# define SCALER5_DISPSTAT1_FRCNT1_SHIFT		14
 
 #define SCALER_DISPSTATX(x)			(SCALER_DISPSTAT0 +        \
 						 (x) * (SCALER_DISPSTAT1 - \
@@ -436,6 +440,8 @@
 #define SCALER_DISPSTAT2                        0x00000068
 # define SCALER_DISPSTAT2_FRCNT2_MASK		VC4_MASK(17, 12)
 # define SCALER_DISPSTAT2_FRCNT2_SHIFT		12
+# define SCALER5_DISPSTAT2_FRCNT2_MASK		VC4_MASK(19, 14)
+# define SCALER5_DISPSTAT2_FRCNT2_SHIFT		14
 
 #define SCALER_DISPBASE2                        0x0000006c
 #define SCALER_DISPALPHA2                       0x00000070

-- 
2.34.1