2016년 09월 26일 20:36에 Tobias Jakobi 이(가) 쓴 글:
> Only manipulate the MXR_CFG and MXR_LAYER_CFG registers once
> in mixer_cfg_layer().
> Trigger this via atomic flush.
>
> Changes in v2:
> - issue mixer_cfg_layer() in mixer_disable()
> - rename fields as suggested by Andrzej
> - added docu to mixer context struct
> - simplify mixer_win_reset() as well
>
> Changes in v3:
> - simplify some conditions as suggested by Inki
> - add docu to mixer_cfg_layer()
> - fold switch statements into a single one
>
> 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);
You removed the function call to set MXR_CFG and MXR_LAYER_CFG registers so what if lagacy set plane ioctl is called by user user space? Where these register are updated?
> 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));
ditto.
>
> /* 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);
atomic_flush callback will be used to make sure registers to be updated to the real hardware. So calling mixer_cfg_layer function here wouldn't be reasonable.
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