Consider the following scenario:
- mixer hardware block is present including video processor
- userspace uses atomic DRM API
- userspace uses all available planes
The following call sequence (simplified) now happens when
userspace issues an atomic commit.
(1) mixer_atomic_begin()
(2) mixer_update_plane() [for 1st mixer plane]
(3) mixer_update_plane() [for 2nd mixer plane]
(4) mixer_update_plane() [for video plane]
(5) mixer_atomic_flush()
For the 1st and 2nd mixer plane mixer_update_plane() internally
calls mixer_graph_buffer(), for the video plane vp_video_buffer()
is called.
Both mixer_graph_buffer() and vp_video_buffer() setup registers
and issue these calls near the end.
- mixer_cfg_layer() & mixer_cfg_gfx_blend() [mixer]
- mixer_cfg_layer() & mixer_cfg_vp_blend() [VP]
mixer_cfg_layer() manipulates the MXR_CFG and MXR_LAYER_CFG
register.
So for each atomic commit we have 6x mixer_reg_writemask().
By rewriting mixer_cfg_layer() and moving it to the atomic
flush step, we reduce this to 2x mixer_reg_writemask().
This is the initial step to consolidate manipulation of MXR_CFG
and MXR_LAYER_CFG to mixer_atomic_flush(). A follow-up patch
is going to move mixer_cfg_scan() and mixer_cfg_rgb_fmt()
as well.
To point out:
- this is not fixing any bugs
- this is not going to improve performance (at least not
noticeable)
This is merely some micro-optimisation and the aforementioned
consolidation of register manipulation.
Signed-off-by: Tobias Jakobi <tjakobi@xxxxxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/exynos/exynos_mixer.c | 135 ++++++++++++++++++++++------------
drivers/gpu/drm/exynos/regs-mixer.h | 2 +
2 files changed, 92 insertions(+), 45 deletions(-)
diff --git a/drivers/gpu/drm/exynos/exynos_mixer.c b/drivers/gpu/drm/exynos/exynos_mixer.c
index 1e78d57..4f06f4d 100644
--- a/drivers/gpu/drm/exynos/exynos_mixer.c
+++ b/drivers/gpu/drm/exynos/exynos_mixer.c
@@ -93,12 +93,25 @@ static const uint32_t vp_formats[] = {
DRM_FORMAT_NV21,
};
+/*
+ * Mixer context structure.
+ *
+ * @crtc: The HDMI CRTC attached to the mixer.
+ * @planes: Array of plane objects for each of the mixer windows.
+ * @active_windows: Cache of the mixer's hardware state.
+ * Tracks which mixer windows are active/inactive.
+ * @pipe: The CRTC index.
+ * @flags: Bitfield build from the mixer_flag_bits enumerator.
+ * @mixer_resources: A struct containing registers, clocks, etc.
+ * @mxr_ver: The hardware revision/version of the mixer.
+ */
struct mixer_context {
struct platform_device *pdev;
struct device *dev;
struct drm_device *drm_dev;
struct exynos_drm_crtc *crtc;
struct exynos_drm_plane planes[MIXER_WIN_NR];
+ unsigned long active_windows;
int pipe;
unsigned long flags;
@@ -418,37 +431,70 @@ static void mixer_cfg_rgb_fmt(struct mixer_context *ctx, unsigned int height)
mixer_reg_writemask(res, MXR_CFG, val, MXR_CFG_RGB_FMT_MASK);
}
-static void mixer_cfg_layer(struct mixer_context *ctx, unsigned int win,
- unsigned int priority, bool enable)
+/**
+ * mixer_cfg_layer - apply layer configuration to hardware
+ * @ctx: mixer context
+ *
+ * This configures the MXR_CFG and MXR_LAYER_CFG hardware registers
+ * using the 'active_windows' field of the the mixer content, and
+ * the pixel format of the framebuffers associated with the enabled
+ * windows.
+ *
+ * Has to be called under mixer lock.
+ */
+static void mixer_cfg_layer(struct mixer_context *ctx)
{
struct mixer_resources *res = &ctx->mixer_res;
- u32 val = enable ? ~0 : 0;
-
- switch (win) {
- case 0:
- mixer_reg_writemask(res, MXR_CFG, val, MXR_CFG_GRP0_ENABLE);
- mixer_reg_writemask(res, MXR_LAYER_CFG,
- MXR_LAYER_CFG_GRP0_VAL(priority),
- MXR_LAYER_CFG_GRP0_MASK);
- break;
- case 1:
- mixer_reg_writemask(res, MXR_CFG, val, MXR_CFG_GRP1_ENABLE);
- mixer_reg_writemask(res, MXR_LAYER_CFG,
- MXR_LAYER_CFG_GRP1_VAL(priority),
- MXR_LAYER_CFG_GRP1_MASK);
+ unsigned int win;
- break;
- case VP_DEFAULT_WIN:
- if (test_bit(MXR_BIT_VP_ENABLED, &ctx->flags)) {
- vp_reg_writemask(res, VP_ENABLE, val, VP_ENABLE_ON);
- mixer_reg_writemask(res, MXR_CFG, val,
- MXR_CFG_VP_ENABLE);
- mixer_reg_writemask(res, MXR_LAYER_CFG,
- MXR_LAYER_CFG_VP_VAL(priority),
- MXR_LAYER_CFG_VP_MASK);
+ struct exynos_drm_plane_state *state;
+ struct drm_framebuffer *fb;
+ unsigned int priority;
+ u32 mxr_cfg = 0, mxr_layer_cfg = 0, vp_enable = 0;
+ bool enable;
+
+ for (win = 0; win < MIXER_WIN_NR; ++win) {
+ state = to_exynos_plane_state(ctx->planes[win].base.state);
+ fb = state->fb;
+
+ priority = state->base.normalized_zpos + 1;
+ enable = test_bit(win, &ctx->active_windows);
+
+ if (!enable)
+ continue;
+
+ BUG_ON(!fb);
+
+ /*
+ * TODO: Don't enable alpha blending for the bottom window.
+ */
+ switch (win) {
+ case 0:
+ mxr_cfg |= MXR_CFG_GRP0_ENABLE;
+ mxr_layer_cfg |= MXR_LAYER_CFG_GRP0_VAL(priority);
+ mixer_cfg_gfx_blend(ctx, win, is_alpha_format(fb->pixel_format));
+ break;
+
+ case 1:
+ mxr_cfg |= MXR_CFG_GRP1_ENABLE;
+ mxr_layer_cfg |= MXR_LAYER_CFG_GRP1_VAL(priority);
+ mixer_cfg_gfx_blend(ctx, win, is_alpha_format(fb->pixel_format));
+ break;
+
+ case VP_DEFAULT_WIN:
+ vp_enable = VP_ENABLE_ON;
+ mxr_cfg |= MXR_CFG_VP_ENABLE;
+ mxr_layer_cfg |= MXR_LAYER_CFG_VP_VAL(priority);
+ mixer_cfg_vp_blend(ctx);
+ break;
}
- break;
}
+
+ if (test_bit(MXR_BIT_VP_ENABLED, &ctx->flags))
+ vp_reg_writemask(res, VP_ENABLE, vp_enable, VP_ENABLE_ON);
+
+ mixer_reg_writemask(res, MXR_CFG, mxr_cfg, MXR_CFG_ENABLE_MASK);
+ mixer_reg_writemask(res, MXR_LAYER_CFG, mxr_layer_cfg, MXR_LAYER_CFG_MASK);
}
static void mixer_run(struct mixer_context *ctx)
@@ -478,7 +524,6 @@ static void vp_video_buffer(struct mixer_context *ctx,
struct drm_display_mode *mode = &state->base.crtc->state->adjusted_mode;
struct mixer_resources *res = &ctx->mixer_res;
struct drm_framebuffer *fb = state->fb;
- unsigned int priority = state->base.normalized_zpos + 1;
unsigned long flags;
dma_addr_t luma_addr[2], chroma_addr[2];
bool tiled_mode = false;
@@ -563,8 +608,6 @@ static void vp_video_buffer(struct mixer_context *ctx,
mixer_cfg_scan(ctx, mode->vdisplay);
mixer_cfg_rgb_fmt(ctx, mode->vdisplay);
- mixer_cfg_layer(ctx, plane->index, priority, true);
- mixer_cfg_vp_blend(ctx);
mixer_run(ctx);
spin_unlock_irqrestore(&res->reg_slock, flags);
@@ -588,7 +631,6 @@ static void mixer_graph_buffer(struct mixer_context *ctx,
struct drm_display_mode *mode = &state->base.crtc->state->adjusted_mode;
struct mixer_resources *res = &ctx->mixer_res;
struct drm_framebuffer *fb = state->fb;
- unsigned int priority = state->base.normalized_zpos + 1;
unsigned long flags;
unsigned int win = plane->index;
unsigned int x_ratio = 0, y_ratio = 0;
@@ -680,8 +722,6 @@ static void mixer_graph_buffer(struct mixer_context *ctx,
mixer_cfg_scan(ctx, mode->vdisplay);
mixer_cfg_rgb_fmt(ctx, mode->vdisplay);
- mixer_cfg_layer(ctx, win, priority, true);
- mixer_cfg_gfx_blend(ctx, win, is_alpha_format(fb->pixel_format));
/* layer update mandatory for mixer 16.0.33.0 */
if (ctx->mxr_ver == MXR_VER_16_0_33_0 ||
@@ -726,9 +766,6 @@ static void mixer_win_reset(struct mixer_context *ctx)
mixer_reg_writemask(res, MXR_STATUS, MXR_STATUS_16_BURST,
MXR_STATUS_BURST_MASK);
- /* reset default layer priority */
- mixer_reg_write(res, MXR_LAYER_CFG, 0);
-
/* setting background color */
mixer_reg_write(res, MXR_BG_COLOR0, 0x008080);
mixer_reg_write(res, MXR_BG_COLOR1, 0x008080);
@@ -740,11 +777,9 @@ static void mixer_win_reset(struct mixer_context *ctx)
vp_default_filter(res);
}
- /* disable all layers */
- mixer_reg_writemask(res, MXR_CFG, 0, MXR_CFG_GRP0_ENABLE);
- mixer_reg_writemask(res, MXR_CFG, 0, MXR_CFG_GRP1_ENABLE);
- if (test_bit(MXR_BIT_VP_ENABLED, &ctx->flags))
- mixer_reg_writemask(res, MXR_CFG, 0, MXR_CFG_VP_ENABLE);
+ /* disable all layers and reset layer priority to default */
+ ctx->active_windows = 0;
+ mixer_cfg_layer(ctx);
spin_unlock_irqrestore(&res->reg_slock, flags);
}
@@ -994,32 +1029,36 @@ static void mixer_update_plane(struct exynos_drm_crtc *crtc,
vp_video_buffer(mixer_ctx, plane);
else
mixer_graph_buffer(mixer_ctx, plane);
+
+ __set_bit(plane->index, &mixer_ctx->active_windows);
}
static void mixer_disable_plane(struct exynos_drm_crtc *crtc,
struct exynos_drm_plane *plane)
{
struct mixer_context *mixer_ctx = crtc->ctx;
- struct mixer_resources *res = &mixer_ctx->mixer_res;
- unsigned long flags;
DRM_DEBUG_KMS("win: %d\n", plane->index);
if (!test_bit(MXR_BIT_POWERED, &mixer_ctx->flags))
return;
- spin_lock_irqsave(&res->reg_slock, flags);
- mixer_cfg_layer(mixer_ctx, plane->index, 0, false);
- spin_unlock_irqrestore(&res->reg_slock, flags);
+ __clear_bit(plane->index, &mixer_ctx->active_windows);
}
static void mixer_atomic_flush(struct exynos_drm_crtc *crtc)
{
struct mixer_context *mixer_ctx = crtc->ctx;
+ struct mixer_resources *res = &mixer_ctx->mixer_res;
+ unsigned long flags;
if (!test_bit(MXR_BIT_POWERED, &mixer_ctx->flags))
return;
+ spin_lock_irqsave(&res->reg_slock, flags);
+ mixer_cfg_layer(mixer_ctx);
+ spin_unlock_irqrestore(&res->reg_slock, flags);
+
mixer_vsync_set_update(mixer_ctx, true);
}
@@ -1053,6 +1092,8 @@ static void mixer_enable(struct exynos_drm_crtc *crtc)
static void mixer_disable(struct exynos_drm_crtc *crtc)
{
struct mixer_context *ctx = crtc->ctx;
+ struct mixer_resources *res = &ctx->mixer_res;
+ unsigned long flags;
int i;
if (!test_bit(MXR_BIT_POWERED, &ctx->flags))
@@ -1064,6 +1105,10 @@ static void mixer_disable(struct exynos_drm_crtc *crtc)
for (i = 0; i < MIXER_WIN_NR; i++)
mixer_disable_plane(crtc, &ctx->planes[i]);
+ spin_lock_irqsave(&res->reg_slock, flags);
+ mixer_cfg_layer(ctx);
+ spin_unlock_irqrestore(&res->reg_slock, flags);
+
exynos_drm_pipe_clk_enable(crtc, false);
pm_runtime_put(ctx->dev);
diff --git a/drivers/gpu/drm/exynos/regs-mixer.h b/drivers/gpu/drm/exynos/regs-mixer.h
index 7f22df5..728a18e 100644
--- a/drivers/gpu/drm/exynos/regs-mixer.h
+++ b/drivers/gpu/drm/exynos/regs-mixer.h
@@ -100,6 +100,7 @@
#define MXR_CFG_GRP1_ENABLE (1 << 5)
#define MXR_CFG_GRP0_ENABLE (1 << 4)
#define MXR_CFG_VP_ENABLE (1 << 3)
+#define MXR_CFG_ENABLE_MASK (0x7 << 3)
#define MXR_CFG_SCAN_INTERLACE (0 << 2)
#define MXR_CFG_SCAN_PROGRESSIVE (1 << 2)
#define MXR_CFG_SCAN_NTSC (0 << 1)
@@ -151,6 +152,7 @@
#define MXR_LAYER_CFG_GRP0_MASK MXR_LAYER_CFG_GRP0_VAL(~0)
#define MXR_LAYER_CFG_VP_VAL(x) MXR_MASK_VAL(x, 3, 0)
#define MXR_LAYER_CFG_VP_MASK MXR_LAYER_CFG_VP_VAL(~0)
+#define MXR_LAYER_CFG_MASK 0xFFF
#endif /* SAMSUNG_REGS_MIXER_H */
--
2.7.3
--
To unsubscribe from this list: send the line "unsubscribe linux-samsung-soc" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
