[PATCH 4/5] drm: lcdif: move pitch setup to plane atomic update

[Lucas Stach]

The buffer pitch may change when switching the buffer on a
atomic update. As the register is double buffered it can be
safely changed while the display is active.

Signed-off-by: Lucas Stach <l.st...@pengutronix.de>
---
 drivers/gpu/drm/mxsfb/lcdif_kms.c | 26 +++++++++++++-------------
 1 file changed, 13 insertions(+), 13 deletions(-)

diff --git a/drivers/gpu/drm/mxsfb/lcdif_kms.c 
b/drivers/gpu/drm/mxsfb/lcdif_kms.c
index 33a082366b25..3ebf55d06027 100644
--- a/drivers/gpu/drm/mxsfb/lcdif_kms.c
+++ b/drivers/gpu/drm/mxsfb/lcdif_kms.c
@@ -327,19 +327,6 @@ static void lcdif_set_mode(struct lcdif_drm_private 
*lcdif, u32 bus_flags)
        writel(CTRLDESCL0_1_HEIGHT(m->vdisplay) |
               CTRLDESCL0_1_WIDTH(m->hdisplay),
               lcdif->base + LCDC_V8_CTRLDESCL0_1);
-
-       /*
-        * Undocumented P_SIZE and T_SIZE bitfields written in the downstream
-        * driver. Those bitfields control the AXI burst size. As of now there
-        * are two known values:
-        *  1 - 128Byte
-        *  2 - 256Byte
-        * Downstream sets this to 256B burst size to improve the memory access
-        * efficiency so set it here too.
-        */
-       ctrl = CTRLDESCL0_3_P_SIZE(2) | CTRLDESCL0_3_T_SIZE(2) |
-              CTRLDESCL0_3_PITCH(lcdif->crtc.primary->state->fb->pitches[0]);
-       writel(ctrl, lcdif->base + LCDC_V8_CTRLDESCL0_3);
 }
 
 static void lcdif_enable_controller(struct lcdif_drm_private *lcdif)
@@ -689,6 +676,19 @@ static void lcdif_plane_primary_atomic_update(struct 
drm_plane *plane,
                writel(CTRLDESCL_HIGH0_4_ADDR_HIGH(upper_32_bits(paddr)),
                       lcdif->base + LCDC_V8_CTRLDESCL_HIGH0_4);
        }
+
+       /*
+        * Undocumented P_SIZE and T_SIZE bitfields written in the downstream
+        * driver. Those bitfields control the AXI burst size. As of now there
+        * are two known values:
+        *  1 - 128Byte
+        *  2 - 256Byte
+        * Downstream sets this to 256B burst size to improve the memory access
+        * efficiency so set it here too.
+        */
+       writel(CTRLDESCL0_3_P_SIZE(2) | CTRLDESCL0_3_T_SIZE(2) |
+              CTRLDESCL0_3_PITCH(new_pstate->fb->pitches[0]),
+              lcdif->base + LCDC_V8_CTRLDESCL0_3);
 }
 
 static bool lcdif_format_mod_supported(struct drm_plane *plane,
-- 
2.39.2