diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/gpu/drm/mediatek/mtk_disp_drv.h | 4 | ||||
| -rw-r--r-- | drivers/gpu/drm/mediatek/mtk_disp_merge.c | 65 | ||||
| -rw-r--r-- | drivers/gpu/drm/mediatek/mtk_disp_ovl_adaptor.c | 17 | ||||
| -rw-r--r-- | drivers/gpu/drm/mediatek/mtk_drm_crtc.c | 17 | ||||
| -rw-r--r-- | drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c | 1 | ||||
| -rw-r--r-- | drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h | 12 |
6 files changed, 116 insertions, 0 deletions
diff --git a/drivers/gpu/drm/mediatek/mtk_disp_drv.h b/drivers/gpu/drm/mediatek/mtk_disp_drv.h index 74fa56339383..90e64467ea8f 100644 --- a/drivers/gpu/drm/mediatek/mtk_disp_drv.h +++ b/drivers/gpu/drm/mediatek/mtk_disp_drv.h @@ -73,6 +73,8 @@ void mtk_merge_advance_config(struct device *dev, unsigned int l_w, unsigned int struct cmdq_pkt *cmdq_pkt); void mtk_merge_start_cmdq(struct device *dev, struct cmdq_pkt *cmdq_pkt); void mtk_merge_stop_cmdq(struct device *dev, struct cmdq_pkt *cmdq_pkt); +enum drm_mode_status mtk_merge_mode_valid(struct device *dev, + const struct drm_display_mode *mode); void mtk_ovl_bgclr_in_on(struct device *dev); void mtk_ovl_bgclr_in_off(struct device *dev); @@ -131,6 +133,8 @@ unsigned int mtk_ovl_adaptor_layer_nr(struct device *dev); struct device *mtk_ovl_adaptor_dma_dev_get(struct device *dev); const u32 *mtk_ovl_adaptor_get_formats(struct device *dev); size_t mtk_ovl_adaptor_get_num_formats(struct device *dev); +enum drm_mode_status mtk_ovl_adaptor_mode_valid(struct device *dev, + const struct drm_display_mode *mode); void mtk_rdma_bypass_shadow(struct device *dev); int mtk_rdma_clk_enable(struct device *dev); diff --git a/drivers/gpu/drm/mediatek/mtk_disp_merge.c b/drivers/gpu/drm/mediatek/mtk_disp_merge.c index 22f768d923d5..32a29924bd54 100644 --- a/drivers/gpu/drm/mediatek/mtk_disp_merge.c +++ b/drivers/gpu/drm/mediatek/mtk_disp_merge.c @@ -222,6 +222,71 @@ void mtk_merge_clk_disable(struct device *dev) clk_disable_unprepare(priv->clk); } +enum drm_mode_status mtk_merge_mode_valid(struct device *dev, + const struct drm_display_mode *mode) +{ + struct mtk_disp_merge *priv = dev_get_drvdata(dev); + unsigned long rate; + + rate = clk_get_rate(priv->clk); + + /* Convert to KHz and round the number */ + rate = (rate + 500) / 1000; + + if (rate && mode->clock > rate) { + dev_dbg(dev, "invalid clock: %d (>%lu)\n", mode->clock, rate); + return MODE_CLOCK_HIGH; + } + + /* + * Measure the bandwidth requirement of hardware prefetch (per frame) + * + * let N = prefetch buffer size in lines + * (ex. N=3, then prefetch buffer size = 3 lines) + * + * prefetch size = htotal * N (pixels) + * time per line = 1 / fps / vtotal (seconds) + * duration = vbp * time per line + * = vbp / fps / vtotal + * + * data rate = prefetch size / duration + * = htotal * N / (vbp / fps / vtotal) + * = htotal * vtotal * fps * N / vbp + * = clk * N / vbp (pixels per second) + * + * Say 4K60 (CEA-861) is the maximum mode supported by the SoC + * data rate = 594000K * N / 72 = 8250 (standard) + * (remove K * N due to the same unit) + * + * For 2560x1440@144 (clk=583600K, vbp=17): + * data rate = 583600 / 17 ~= 34329 > 8250 (NG) + * + * For 2560x1440@120 (clk=497760K, vbp=77): + * data rate = 497760 / 77 ~= 6464 < 8250 (OK) + * + * A non-standard 4K60 timing (clk=521280K, vbp=54) + * data rate = 521280 / 54 ~= 9653 > 8250 (NG) + * + * Bandwidth requirement of hardware prefetch increases significantly + * when the VBP decreases (more than 4x in this example). + * + * The proposed formula is only one way to estimate whether our SoC + * supports the mode setting. The basic idea behind it is just to check + * if the data rate requirement is too high (directly proportional to + * pixel clock, inversely proportional to vbp). Please adjust the + * function if it doesn't fit your situation in the future. + */ + rate = mode->clock / (mode->vtotal - mode->vsync_end); + + if (rate > 8250) { + dev_dbg(dev, "invalid rate: %lu (>8250): " DRM_MODE_FMT "\n", + rate, DRM_MODE_ARG(mode)); + return MODE_BAD; + } + + return MODE_OK; +} + static int mtk_disp_merge_bind(struct device *dev, struct device *master, void *data) { diff --git a/drivers/gpu/drm/mediatek/mtk_disp_ovl_adaptor.c b/drivers/gpu/drm/mediatek/mtk_disp_ovl_adaptor.c index 309c48c9a07c..034d31824d4d 100644 --- a/drivers/gpu/drm/mediatek/mtk_disp_ovl_adaptor.c +++ b/drivers/gpu/drm/mediatek/mtk_disp_ovl_adaptor.c @@ -89,6 +89,7 @@ static const struct mtk_ddp_comp_funcs ethdr = { static const struct mtk_ddp_comp_funcs merge = { .clk_enable = mtk_merge_clk_enable, .clk_disable = mtk_merge_clk_disable, + .mode_valid = mtk_merge_mode_valid, }; static const struct mtk_ddp_comp_funcs padding = { @@ -342,6 +343,22 @@ void mtk_ovl_adaptor_clk_disable(struct device *dev) } } +enum drm_mode_status mtk_ovl_adaptor_mode_valid(struct device *dev, + const struct drm_display_mode *mode) + +{ + int i; + struct mtk_disp_ovl_adaptor *ovl_adaptor = dev_get_drvdata(dev); + + for (i = 0; i < OVL_ADAPTOR_ID_MAX; i++) { + dev = ovl_adaptor->ovl_adaptor_comp[i]; + if (!dev || !comp_matches[i].funcs->mode_valid) + continue; + return comp_matches[i].funcs->mode_valid(dev, mode); + } + return MODE_OK; +} + unsigned int mtk_ovl_adaptor_layer_nr(struct device *dev) { return MTK_OVL_ADAPTOR_LAYER_NUM; diff --git a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c index c729af3b9822..3b55c7a68bde 100644 --- a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c +++ b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c @@ -213,6 +213,22 @@ static void mtk_drm_crtc_destroy_state(struct drm_crtc *crtc, kfree(to_mtk_crtc_state(state)); } +static enum drm_mode_status +mtk_drm_crtc_mode_valid(struct drm_crtc *crtc, + const struct drm_display_mode *mode) +{ + struct mtk_drm_crtc *mtk_crtc = to_mtk_crtc(crtc); + enum drm_mode_status status = MODE_OK; + int i; + + for (i = 0; i < mtk_crtc->ddp_comp_nr; i++) { + status = mtk_ddp_comp_mode_valid(mtk_crtc->ddp_comp[i], mode); + if (status != MODE_OK) + break; + } + return status; +} + static bool mtk_drm_crtc_mode_fixup(struct drm_crtc *crtc, const struct drm_display_mode *mode, struct drm_display_mode *adjusted_mode) @@ -831,6 +847,7 @@ static const struct drm_crtc_funcs mtk_crtc_funcs = { static const struct drm_crtc_helper_funcs mtk_crtc_helper_funcs = { .mode_fixup = mtk_drm_crtc_mode_fixup, .mode_set_nofb = mtk_drm_crtc_mode_set_nofb, + .mode_valid = mtk_drm_crtc_mode_valid, .atomic_begin = mtk_drm_crtc_atomic_begin, .atomic_flush = mtk_drm_crtc_atomic_flush, .atomic_enable = mtk_drm_crtc_atomic_enable, diff --git a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c index a9b5a21cde2d..a515e96cfefc 100644 --- a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c +++ b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c @@ -418,6 +418,7 @@ static const struct mtk_ddp_comp_funcs ddp_ovl_adaptor = { .remove = mtk_ovl_adaptor_remove_comp, .get_formats = mtk_ovl_adaptor_get_formats, .get_num_formats = mtk_ovl_adaptor_get_num_formats, + .mode_valid = mtk_ovl_adaptor_mode_valid, }; static const char * const mtk_ddp_comp_stem[MTK_DDP_COMP_TYPE_MAX] = { diff --git a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h index 15b2eafff438..93d79a1366e9 100644 --- a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h +++ b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h @@ -12,6 +12,8 @@ #include <linux/soc/mediatek/mtk-mmsys.h> #include <linux/soc/mediatek/mtk-mutex.h> +#include <drm/drm_modes.h> + struct device; struct device_node; struct drm_crtc; @@ -85,6 +87,7 @@ struct mtk_ddp_comp_funcs { void (*add)(struct device *dev, struct mtk_mutex *mutex); void (*remove)(struct device *dev, struct mtk_mutex *mutex); unsigned int (*encoder_index)(struct device *dev); + enum drm_mode_status (*mode_valid)(struct device *dev, const struct drm_display_mode *mode); }; struct mtk_ddp_comp { @@ -126,6 +129,15 @@ static inline void mtk_ddp_comp_clk_disable(struct mtk_ddp_comp *comp) comp->funcs->clk_disable(comp->dev); } +static inline +enum drm_mode_status mtk_ddp_comp_mode_valid(struct mtk_ddp_comp *comp, + const struct drm_display_mode *mode) +{ + if (comp && comp->funcs && comp->funcs->mode_valid) + return comp->funcs->mode_valid(comp->dev, mode); + return MODE_OK; +} + static inline void mtk_ddp_comp_config(struct mtk_ddp_comp *comp, unsigned int w, unsigned int h, unsigned int vrefresh, unsigned int bpc, |