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.stach@xxxxxxxxxxxxxx> --- 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
