linux-kernel - [PATCH 07/14] drm/tidss: dispc: Switch REG

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Message-Id: <20250730-drm-tidss-field-api-v1-7-a71ae8dd2782@kernel.org>
Date: Wed, 30 Jul 2025 10:57:07 +0200
From: Maxime Ripard <mripard@...nel.org>
To: Jyri Sarha <jyri.sarha@....fi>, 
 Tomi Valkeinen <tomi.valkeinen@...asonboard.com>, 
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, 
 Thomas Zimmermann <tzimmermann@...e.de>, David Airlie <airlied@...il.com>, 
 Simona Vetter <simona@...ll.ch>
Cc: dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org, 
 Maxime Ripard <mripard@...nel.org>
Subject: [PATCH 07/14] drm/tidss: dispc: Switch REG_GET to using a mask

The REG_GET function takes the start and end bits as parameter and will
generate a mask out of them.

This makes it difficult to share the masks between callers, since we now
need two arguments and to keep them consistent.

Let's change REG_GET to take the mask as an argument instead, and let
the caller create the mask. Eventually, this mask will be moved to a
define.

Signed-off-by: Maxime Ripard <mripard@...nel.org>
---
 drivers/gpu/drm/tidss/tidss_dispc.c | 20 ++++++++++----------
 1 file changed, 10 insertions(+), 10 deletions(-)

diff --git a/drivers/gpu/drm/tidss/tidss_dispc.c b/drivers/gpu/drm/tidss/tidss_dispc.c
index e4729a5b79ed5d554e05c020adb7e2d3e7a8f4d3..cfd6c4cf716904cf78699baf2eb4c3a0f57a1abe 100644
--- a/drivers/gpu/drm/tidss/tidss_dispc.c
+++ b/drivers/gpu/drm/tidss/tidss_dispc.c
@@ -612,13 +612,13 @@ void tidss_disable_oldi(struct tidss_device *tidss, u32 hw_videoport)
 static u32 FLD_MOD(u32 orig, u32 val, u32 mask)
 {
 	return (orig & ~mask) | FIELD_PREP(mask, val);
 }
 
-static u32 REG_GET(struct dispc_device *dispc, u32 idx, u32 start, u32 end)
+static u32 REG_GET(struct dispc_device *dispc, u32 idx, u32 mask)
 {
-	return FIELD_GET(GENMASK(start, end), dispc_read(dispc, idx));
+	return FIELD_GET(mask, dispc_read(dispc, idx));
 }
 
 static void REG_FLD_MOD(struct dispc_device *dispc, u32 idx, u32 val,
 			u32 start, u32 end)
 {
@@ -2808,30 +2808,30 @@ int dispc_runtime_resume(struct dispc_device *dispc)
 {
 	dev_dbg(dispc->dev, "resume\n");
 
 	clk_prepare_enable(dispc->fclk);
 
-	if (REG_GET(dispc, DSS_SYSSTATUS, 0, 0) == 0)
+	if (REG_GET(dispc, DSS_SYSSTATUS, GENMASK(0, 0)) == 0)
 		dev_warn(dispc->dev, "DSS FUNC RESET not done!\n");
 
 	dev_dbg(dispc->dev, "OMAP DSS7 rev 0x%x\n",
 		dispc_read(dispc, DSS_REVISION));
 
 	dev_dbg(dispc->dev, "VP RESETDONE %d,%d,%d\n",
-		REG_GET(dispc, DSS_SYSSTATUS, 1, 1),
-		REG_GET(dispc, DSS_SYSSTATUS, 2, 2),
-		REG_GET(dispc, DSS_SYSSTATUS, 3, 3));
+		REG_GET(dispc, DSS_SYSSTATUS, GENMASK(1, 1)),
+		REG_GET(dispc, DSS_SYSSTATUS, GENMASK(2, 2)),
+		REG_GET(dispc, DSS_SYSSTATUS, GENMASK(3, 3)));
 
 	if (dispc->feat->subrev == DISPC_AM625 ||
 	    dispc->feat->subrev == DISPC_AM65X)
 		dev_dbg(dispc->dev, "OLDI RESETDONE %d,%d,%d\n",
-			REG_GET(dispc, DSS_SYSSTATUS, 5, 5),
-			REG_GET(dispc, DSS_SYSSTATUS, 6, 6),
-			REG_GET(dispc, DSS_SYSSTATUS, 7, 7));
+			REG_GET(dispc, DSS_SYSSTATUS, GENMASK(5, 5)),
+			REG_GET(dispc, DSS_SYSSTATUS, GENMASK(6, 6)),
+			REG_GET(dispc, DSS_SYSSTATUS, GENMASK(7, 7)));
 
 	dev_dbg(dispc->dev, "DISPC IDLE %d\n",
-		REG_GET(dispc, DSS_SYSSTATUS, 9, 9));
+		REG_GET(dispc, DSS_SYSSTATUS, GENMASK(9, 9)));
 
 	dispc_initial_config(dispc);
 
 	dispc->is_enabled = true;
 

-- 
2.50.1