linux-kernel - [PATCH 18/37] drm/vc4: txp: Handle 40-bits DMA Addresses

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Message-Id: <20241023-drm-vc4-2712-support-v1-18-1cc2d5594907@raspberrypi.com>
Date: Wed, 23 Oct 2024 17:50:15 +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 18/37] drm/vc4: txp: Handle 40-bits DMA Addresses

From: Maxime Ripard <mripard@...nel.org>

The BCM2712 MOP and MOPLET can handle addresses larger than 32bits
through an extra register. We can easily support it and make it
conditional based on the compatible through a boolean in our variant
structure.

Signed-off-by: Maxime Ripard <mripard@...nel.org>
Signed-off-by: Dave Stevenson <dave.stevenson@...pberrypi.com>
---
 drivers/gpu/drm/vc4/vc4_drv.h |  2 ++
 drivers/gpu/drm/vc4/vc4_txp.c | 12 +++++++++++-
 2 files changed, 13 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/vc4/vc4_drv.h b/drivers/gpu/drm/vc4/vc4_drv.h
index 984fddae0048..34e72e711a17 100644
--- a/drivers/gpu/drm/vc4/vc4_drv.h
+++ b/drivers/gpu/drm/vc4/vc4_drv.h
@@ -538,8 +538,10 @@ struct vc4_crtc_data {
 
 struct vc4_txp_data {
 	struct vc4_crtc_data	base;
+	unsigned int high_addr_ptr_reg;
 	unsigned int has_byte_enable:1;
 	unsigned int size_minus_one:1;
+	unsigned int supports_40bit_addresses:1;
 };
 
 extern const struct vc4_txp_data bcm2835_txp_data;
diff --git a/drivers/gpu/drm/vc4/vc4_txp.c b/drivers/gpu/drm/vc4/vc4_txp.c
index d2ee872e9c0b..c2726ccde1cf 100644
--- a/drivers/gpu/drm/vc4/vc4_txp.c
+++ b/drivers/gpu/drm/vc4/vc4_txp.c
@@ -145,6 +145,9 @@
 /* Number of lines received and committed to memory. */
 #define TXP_PROGRESS		0x10
 
+#define TXP_DST_PTR_HIGH_MOPLET	0x1c
+#define TXP_DST_PTR_HIGH_MOP	0x24
+
 #define TXP_READ(offset)								\
 	({										\
 		kunit_fail_current_test("Accessing a register in a unit test!\n");	\
@@ -293,6 +296,7 @@ static void vc4_txp_connector_atomic_commit(struct drm_connector *conn,
 	struct drm_framebuffer *fb;
 	unsigned int hdisplay;
 	unsigned int vdisplay;
+	dma_addr_t addr;
 	u32 ctrl;
 	int idx;
 	int i;
@@ -330,7 +334,13 @@ static void vc4_txp_connector_atomic_commit(struct drm_connector *conn,
 		return;
 
 	gem = drm_fb_dma_get_gem_obj(fb, 0);
-	TXP_WRITE(TXP_DST_PTR, gem->dma_addr + fb->offsets[0]);
+	addr = gem->dma_addr + fb->offsets[0];
+
+	TXP_WRITE(TXP_DST_PTR, lower_32_bits(addr));
+
+	if (txp_data->supports_40bit_addresses)
+		TXP_WRITE(txp_data->high_addr_ptr_reg, upper_32_bits(addr) & 0xff);
+
 	TXP_WRITE(TXP_DST_PITCH, fb->pitches[0]);
 
 	hdisplay = mode->hdisplay ?: 1;

-- 
2.34.1