drm/etnaviv: Add a new function to emit a series of states to cmd stream

v2: fix formatting and remove superfluous masking (Lucas)

Signed-off-by: Gert Wollny <gert.wollny@collabora.com>
Reviewed-by: Christian Gmeiner <cgmeiner@igalia.com>
Tested-by: Marek Vasut <marek.vasut@mailbox.org> # STM32MP255C DHCOS DHSBC
Link: https://patch.msgid.link/20251119164624.9297-4-gert.wollny@collabora.com
Signed-off-by: Christian Gmeiner <cgmeiner@igalia.com>

Author: gerddie

drivers/gpu/drm/etnaviv/etnaviv_buffer.h

@@ -36,6 +36,19 @@ 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);