linux-kernel - [PATCH] drm/stm: Remove usage of drm_display_mode_to

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Message-ID: <20210528080513.8168-1-yannick.fertre@foss.st.com>
Date:   Fri, 28 May 2021 10:05:13 +0200
From:   Yannick Fertre <yannick.fertre@...s.st.com>
To:     Yannick Fertre <yannick.fertre@...s.st.com>,
        Philippe Cornu <philippe.cornu@...s.st.com>,
        Antonio Borneo <antonio.borneo@...com>,
        "David Airlie" <airlied@...ux.ie>, Daniel Vetter <daniel@...ll.ch>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        <dri-devel@...ts.freedesktop.org>,
        <linux-stm32@...md-mailman.stormreply.com>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>
Subject: [PATCH] drm/stm: Remove usage of drm_display_mode_to_videomode()

There is not much value in the extra conversion step, the calculations
required for the LTDC IP are different than what is used in the
drm_display_mode_to_videomode(), so just do the right ones in the LTDC
driver right away.

Signed-off-by: Marek Vasut <marex@...x.de>
Signed-off-by: Yannick Fertre <yannick.fertre@...s.st.com>
---
 drivers/gpu/drm/stm/ltdc.c | 32 +++++++++++++++++---------------
 1 file changed, 17 insertions(+), 15 deletions(-)

diff --git a/drivers/gpu/drm/stm/ltdc.c b/drivers/gpu/drm/stm/ltdc.c
index e99771b947b6..d113b9be12c0 100644
--- a/drivers/gpu/drm/stm/ltdc.c
+++ b/drivers/gpu/drm/stm/ltdc.c
@@ -570,31 +570,33 @@ static void ltdc_crtc_mode_set_nofb(struct drm_crtc *crtc)
 		}
 	}
 
-	drm_display_mode_to_videomode(mode, &vm);
-
 	DRM_DEBUG_DRIVER("CRTC:%d mode:%s\n", crtc->base.id, mode->name);
-	DRM_DEBUG_DRIVER("Video mode: %dx%d", vm.hactive, vm.vactive);
+	DRM_DEBUG_DRIVER("Video mode: %dx%d", mode->hdisplay, mode->vdisplay);
 	DRM_DEBUG_DRIVER(" hfp %d hbp %d hsl %d vfp %d vbp %d vsl %d\n",
-			 vm.hfront_porch, vm.hback_porch, vm.hsync_len,
-			 vm.vfront_porch, vm.vback_porch, vm.vsync_len);
+			 mode->hsync_start - mode->hdisplay,
+			 mode->htotal - mode->hsync_end,
+			 mode->hsync_end - mode->hsync_start,
+			 mode->vsync_start - mode->vdisplay,
+			 mode->vtotal - mode->vsync_end,
+			 mode->vsync_end - mode->vsync_start);
 
 	/* Convert video timings to ltdc timings */
-	hsync = vm.hsync_len - 1;
-	vsync = vm.vsync_len - 1;
-	accum_hbp = hsync + vm.hback_porch;
-	accum_vbp = vsync + vm.vback_porch;
-	accum_act_w = accum_hbp + vm.hactive;
-	accum_act_h = accum_vbp + vm.vactive;
-	total_width = accum_act_w + vm.hfront_porch;
-	total_height = accum_act_h + vm.vfront_porch;
+	hsync = mode->hsync_end - mode->hsync_start - 1;
+	vsync = mode->vsync_end - mode->vsync_start - 1;
+	accum_hbp = mode->htotal - mode->hsync_start - 1;
+	accum_vbp = mode->vtotal - mode->vsync_start - 1;
+	accum_act_w = accum_hbp + mode->hdisplay;
+	accum_act_h = accum_vbp + mode->vdisplay;
+	total_width = mode->htotal - 1;
+	total_height = mode->vtotal - 1;
 
 	/* Configures the HS, VS, DE and PC polarities. Default Active Low */
 	val = 0;
 
-	if (vm.flags & DISPLAY_FLAGS_HSYNC_HIGH)
+	if (mode->flags & DRM_MODE_FLAG_PHSYNC)
 		val |= GCR_HSPOL;
 
-	if (vm.flags & DISPLAY_FLAGS_VSYNC_HIGH)
+	if (mode->flags & DRM_MODE_FLAG_PVSYNC)
 		val |= GCR_VSPOL;
 
 	if (bus_flags & DRM_BUS_FLAG_DE_LOW)
-- 
2.17.1