From 39edb28780e8bf623565fbd2fd0ea091f315ceb3 Mon Sep 17 00:00:00 2001 From: Thomas Zimmermann Date: Mon, 14 Sep 2020 09:22:34 +0200 Subject: [PATCH] drm/ast: Disable planes while switching display modes The ast HW cursor requires the primary plane and CRTC to display at a valid mode and format. This is not the case while switching display modes, which can lead to the screen turing permanently dark. As a workaround, the ast driver now disables active planes while the mode or format switch takes place. It also synchronizes with the vertical refresh to give CRTC and planes some time to catch up on each other. The active planes planes (primary or cursor) will be re-enabled by each plane's atomic_update() function. v3: * move the logic into the CRTC's atomic_disable function v2: * move the logic into the commit-tail function Signed-off-by: Thomas Zimmermann Acked-by: Daniel Vetter Link: https://patchwork.freedesktop.org/patch/msgid/20200914072236.19398-3-tzimmermann@suse.de --- drivers/gpu/drm/ast/ast_drv.h | 2 ++ drivers/gpu/drm/ast/ast_mode.c | 31 +++++++++++++++++++++++++++++++ 2 files changed, 33 insertions(+) diff --git a/drivers/gpu/drm/ast/ast_drv.h b/drivers/gpu/drm/ast/ast_drv.h index c1af6b7..467049c 100644 --- a/drivers/gpu/drm/ast/ast_drv.h +++ b/drivers/gpu/drm/ast/ast_drv.h @@ -177,6 +177,8 @@ struct ast_private *ast_device_create(struct drm_driver *drv, #define AST_IO_MM_OFFSET (0x380) +#define AST_IO_VGAIR1_VREFRESH BIT(3) + #define __ast_read(x) \ static inline u##x ast_read##x(struct ast_private *ast, u32 reg) { \ u##x val = 0;\ diff --git a/drivers/gpu/drm/ast/ast_mode.c b/drivers/gpu/drm/ast/ast_mode.c index 2323fe0..5b45b57 100644 --- a/drivers/gpu/drm/ast/ast_mode.c +++ b/drivers/gpu/drm/ast/ast_mode.c @@ -514,6 +514,16 @@ static void ast_set_start_address_crt1(struct ast_private *ast, } +static void ast_wait_for_vretrace(struct ast_private *ast) +{ + unsigned long timeout = jiffies + HZ; + u8 vgair1; + + do { + vgair1 = ast_io_read8(ast, AST_IO_INPUT_STATUS1_READ); + } while (!(vgair1 & AST_IO_VGAIR1_VREFRESH) && time_before(jiffies, timeout)); +} + /* * Primary plane */ @@ -809,7 +819,28 @@ static void ast_crtc_helper_atomic_disable(struct drm_crtc *crtc, struct drm_crtc_state *old_crtc_state) { + struct drm_device *dev = crtc->dev; + struct ast_private *ast = to_ast_private(dev); + ast_crtc_dpms(crtc, DRM_MODE_DPMS_OFF); + + /* + * HW cursors require the underlying primary plane and CRTC to + * display a valid mode and image. This is not the case during + * full modeset operations. So we temporarily disable any active + * plane, including the HW cursor. Each plane's atomic_update() + * helper will re-enable it if necessary. + * + * We only do this during *full* modesets. It does not affect + * simple pageflips on the planes. + */ + drm_atomic_helper_disable_planes_on_crtc(old_crtc_state, false); + + /* + * Ensure that no scanout takes place before reprogramming mode + * and format registers. + */ + ast_wait_for_vretrace(ast); } static const struct drm_crtc_helper_funcs ast_crtc_helper_funcs = { -- 2.7.4