linux-kernel - [PATCH v4 3/5] drm/etnaviv: Add a new function to emit a series of states to cmd stream

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Message-ID: <20251110144625.18653-4-gert.wollny@collabora.com>
Date: Mon, 10 Nov 2025 15:37:49 +0100
From: gert.wollny@...labora.com
To: Christian Gmeiner <christian.gmeiner@...il.com>
Cc: Lucas Stach <l.stach@...gutronix.de>,
	Russell King <linux+etnaviv@...linux.org.uk>,
	David Airlie <airlied@...il.com>,
	Daniel Vetter <daniel@...ll.ch>,
	etnaviv@...ts.freedesktop.org,
	dri-devel@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org,
	Gert Wollny <gert.wollny@...labora.com>
Subject: [PATCH v4 3/5] drm/etnaviv: Add a new function to emit a series of states to cmd stream

From: Gert Wollny <gert.wollny@...labora.com>

v2: fix formatting and remove superfluous masking (Lucas)

Signed-off-by: Gert Wollny <gert.wollny@...labora.com>
---
 drivers/gpu/drm/etnaviv/etnaviv_buffer.h | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/drivers/gpu/drm/etnaviv/etnaviv_buffer.h b/drivers/gpu/drm/etnaviv/etnaviv_buffer.h
index ae1ba1db6c8a..9388a686edcf 100644
--- a/drivers/gpu/drm/etnaviv/etnaviv_buffer.h
+++ b/drivers/gpu/drm/etnaviv/etnaviv_buffer.h
@@ -43,6 +43,19 @@ static inline void CMD_LOAD_STATE(struct etnaviv_cmdbuf *buffer, u32 reg,
 	OUT(buffer, value);
 }
 
+static inline void CMD_LOAD_STATES_START(struct etnaviv_cmdbuf *buffer, u32 reg,
+					 u32 nvalues)
+{
+	u32 index = reg >> VIV_FE_LOAD_STATE_HEADER_OFFSET__SHR;
+
+	buffer->user_size = ALIGN(buffer->user_size, 8);
+
+	/* write a register via cmd stream */
+	OUT(buffer, VIV_FE_LOAD_STATE_HEADER_OP_LOAD_STATE |
+			    VIV_FE_LOAD_STATE_HEADER_OFFSET(index) |
+			    VIV_FE_LOAD_STATE_HEADER_COUNT(nvalues));
+}
+
 static inline void CMD_END(struct etnaviv_cmdbuf *buffer)
 {
 	buffer->user_size = ALIGN(buffer->user_size, 8);
-- 
2.51.0