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Lin" , , , , , Hsiao Chien Sung Subject: [PATCH v5 10/13] drm/mediatek: Support CRC in display driver Date: Thu, 15 Feb 2024 18:11:16 +0800 Message-ID: <20240215101119.12629-11-shawn.sung@mediatek.com> X-Mailer: git-send-email 2.18.0 In-Reply-To: <20240215101119.12629-1-shawn.sung@mediatek.com> References: <20240215101119.12629-1-shawn.sung@mediatek.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MTK: N Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Register CRC related function pointers to support CRC retrieval. Signed-off-by: Hsiao Chien Sung --- drivers/gpu/drm/mediatek/mtk_drm_crtc.c | 239 ++++++++++++++++++++ drivers/gpu/drm/mediatek/mtk_drm_crtc.h | 39 ++++ drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h | 3 + 3 files changed, 281 insertions(+) diff --git a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c b/drivers/gpu/drm/medi= atek/mtk_drm_crtc.c index 14cf75fa217f9..6cb1ed419dee7 100644 --- a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c +++ b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c @@ -68,6 +68,9 @@ struct mtk_drm_crtc { /* lock for display hardware access */ struct mutex hw_lock; bool config_updating; + + struct mtk_ddp_comp *crc_provider; + unsigned int frames; }; =20 struct mtk_crtc_state { @@ -635,6 +638,14 @@ static void mtk_crtc_ddp_irq(void *data) struct drm_crtc *crtc =3D data; struct mtk_drm_crtc *mtk_crtc =3D to_mtk_crtc(crtc); struct mtk_drm_private *priv =3D crtc->dev->dev_private; + struct mtk_ddp_comp *comp =3D mtk_crtc->crc_provider; + + /* + * crc providers should make sure the crc is always correct + * by resetting it in .crc_read() + */ + if (crtc->crc.opened) + comp->funcs->crc_read(comp->dev); =20 #if IS_REACHABLE(CONFIG_MTK_CMDQ) if (!priv->data->shadow_register && !mtk_crtc->cmdq_client.chan) @@ -646,6 +657,24 @@ static void mtk_crtc_ddp_irq(void *data) if (!priv->data->shadow_register) mtk_crtc_ddp_config(crtc, NULL); #endif + + /* + * drm_crtc_add_crc_entry() could take more than 50ms to finish + * put it at the end of the isr + */ + if (crtc->crc.opened) { + /* + * skip the first crc because the first frame is configured by + * mtk_crtc_ddp_hw_init() when atomic enable + */ + if (++mtk_crtc->frames > 1) { + drm_crtc_add_crc_entry(crtc, true, + drm_crtc_vblank_count(crtc), + comp->funcs->crc_entry(comp->dev)); + } + } else { + mtk_crtc->frames =3D 0; + } mtk_drm_finish_page_flip(mtk_crtc); } =20 @@ -704,6 +733,40 @@ static void mtk_drm_crtc_update_output(struct drm_crtc= *crtc, } } =20 +static int mtk_drm_crtc_set_crc_source(struct drm_crtc *crtc, const char *= src) +{ + if (src && strcmp(src, "auto") !=3D 0) { + DRM_ERROR("%s(crtc-%d): unknown source '%s'\n", + __func__, drm_crtc_index(crtc), src); + return -EINVAL; + } + return 0; +} + +static int mtk_drm_crtc_verify_crc_source(struct drm_crtc *crtc, + const char *src, + size_t *cnt) +{ + struct mtk_drm_crtc *mtk_crtc =3D to_mtk_crtc(crtc); + struct mtk_ddp_comp *comp =3D mtk_crtc->crc_provider; + + if (!comp) { + DRM_ERROR("%s(crtc-%d): no crc provider\n", + __func__, drm_crtc_index(crtc)); + return -ENOENT; + } + + if (src && strcmp(src, "auto") !=3D 0) { + DRM_ERROR("%s(crtc-%d): unknown source '%s'\n", + __func__, drm_crtc_index(crtc), src); + return -EINVAL; + } + + *cnt =3D comp->funcs->crc_cnt(comp->dev); + + return 0; +} + int mtk_drm_crtc_plane_check(struct drm_crtc *crtc, struct drm_plane *plan= e, struct mtk_plane_state *state) { @@ -841,6 +904,8 @@ static const struct drm_crtc_funcs mtk_crtc_funcs =3D { .atomic_destroy_state =3D mtk_drm_crtc_destroy_state, .enable_vblank =3D mtk_drm_crtc_enable_vblank, .disable_vblank =3D mtk_drm_crtc_disable_vblank, + .set_crc_source =3D mtk_drm_crtc_set_crc_source, + .verify_crc_source =3D mtk_drm_crtc_verify_crc_source, }; =20 static const struct drm_crtc_helper_funcs mtk_crtc_helper_funcs =3D { @@ -1033,6 +1098,11 @@ int mtk_drm_crtc_create(struct drm_device *drm_dev, =20 if (comp->funcs->ctm_set) has_ctm =3D true; + + if (comp->funcs->crc_cnt && + comp->funcs->crc_entry && + comp->funcs->crc_read) + mtk_crtc->crc_provider =3D comp; } =20 mtk_ddp_comp_register_vblank_cb(comp, mtk_crtc_ddp_irq, @@ -1137,3 +1207,172 @@ int mtk_drm_crtc_create(struct drm_device *drm_dev, =20 return 0; } + +void mtk_drm_crc_init(struct mtk_drm_crc *crc, + const u32 *crc_offset_table, size_t crc_count, + u32 reset_offset, u32 reset_mask) +{ + crc->ofs =3D crc_offset_table; + crc->cnt =3D crc_count; + crc->rst_ofs =3D reset_offset; + crc->rst_msk =3D reset_mask; + crc->va =3D kcalloc(crc->cnt, sizeof(*crc->va), GFP_KERNEL); + if (!crc->va) { + DRM_ERROR("failed to allocate memory for crc\n"); + crc->cnt =3D 0; + } +} + +void mtk_drm_crc_read(struct mtk_drm_crc *crc, void __iomem *reg) +{ + if (!crc->cnt || !crc->ofs || !crc->va) + return; + +#if IS_REACHABLE(CONFIG_MTK_CMDQ) + /* sync to see the most up-to-date copy of the DMA buffer */ + dma_sync_single_for_cpu(crc->cmdq_client.chan->mbox->dev, + crc->pa, crc->cnt * sizeof(*crc->va), + DMA_FROM_DEVICE); +#else + /* read crc with cpu for the platforms without cmdq */ + { + u32 n; + + for (n =3D 0; n < crc->cnt; n++) + crc->va[n] =3D readl(reg + crc->ofs[n]); + + n =3D readl(reg + crc->rst_ofs); + + /* pull reset bit */ + n |=3D crc->rst_msk; + writel(n, reg + crc->rst_ofs); + + /* release reset bit */ + n &=3D ~crc->rst_msk; + writel(n, reg + crc->rst_ofs); + } +#endif +} + +void mtk_drm_crc_destroy(struct mtk_drm_crc *crc) +{ + if (!crc->cnt) + return; + +#if IS_REACHABLE(CONFIG_MTK_CMDQ) + if (crc->pa) { + dma_unmap_single(crc->cmdq_client.chan->mbox->dev, + crc->pa, crc->cnt * sizeof(*crc->va), + DMA_TO_DEVICE); + crc->pa =3D 0; + } + if (crc->cmdq_client.chan) { + mtk_drm_cmdq_pkt_destroy(&crc->cmdq_handle); + mbox_free_channel(crc->cmdq_client.chan); + crc->cmdq_client.chan =3D NULL; + } +#endif + kfree(crc->va); + crc->va =3D NULL; + crc->cnt =3D 0; +} + +#if IS_REACHABLE(CONFIG_MTK_CMDQ) +void mtk_drm_crc_cmdq_create(struct device *dev, struct mtk_drm_crc *crc) +{ + int i; + + if (!crc->cnt) { + dev_warn(dev, "%s: not support\n", __func__); + goto cleanup; + } + + if (!crc->ofs) { + dev_warn(dev, "%s: not defined\n", __func__); + goto cleanup; + } + + crc->cmdq_client.client.dev =3D dev; + crc->cmdq_client.client.tx_block =3D false; + crc->cmdq_client.client.knows_txdone =3D true; + crc->cmdq_client.client.rx_callback =3D NULL; + crc->cmdq_client.chan =3D mbox_request_channel(&crc->cmdq_client.client, = 0); + if (IS_ERR(crc->cmdq_client.chan)) { + dev_warn(dev, "%s: failed to create mailbox client\n", __func__); + crc->cmdq_client.chan =3D NULL; + goto cleanup; + } + + if (mtk_drm_cmdq_pkt_create(&crc->cmdq_client, &crc->cmdq_handle, PAGE_SI= ZE)) { + dev_warn(dev, "%s: failed to create cmdq packet\n", __func__); + goto cleanup; + } + + if (!crc->va) { + dev_warn(dev, "%s: no memory\n", __func__); + goto cleanup; + } + + /* map the entry to get a dma address for cmdq to store the crc */ + crc->pa =3D dma_map_single(crc->cmdq_client.chan->mbox->dev, + crc->va, crc->cnt * sizeof(*crc->va), + DMA_FROM_DEVICE); + + if (dma_mapping_error(crc->cmdq_client.chan->mbox->dev, crc->pa)) { + dev_err(dev, "%s: failed to map dma\n", __func__); + goto cleanup; + } + + if (crc->cmdq_event) + cmdq_pkt_wfe(&crc->cmdq_handle, crc->cmdq_event, true); + + for (i =3D 0; i < crc->cnt; i++) { + /* put crc to spr1 register */ + cmdq_pkt_read_s(&crc->cmdq_handle, crc->cmdq_reg->subsys, + crc->cmdq_reg->offset + crc->ofs[i], + CMDQ_THR_SPR_IDX1); + + /* copy spr1 register to physical address of the crc */ + cmdq_pkt_assign(&crc->cmdq_handle, CMDQ_THR_SPR_IDX0, + CMDQ_ADDR_HIGH(crc->pa + i * sizeof(*crc->va))); + cmdq_pkt_write_s(&crc->cmdq_handle, CMDQ_THR_SPR_IDX0, + CMDQ_ADDR_LOW(crc->pa + i * sizeof(*crc->va)), + CMDQ_THR_SPR_IDX1); + } + /* reset crc */ + mtk_ddp_write_mask(&crc->cmdq_handle, ~0, crc->cmdq_reg, 0, + crc->rst_ofs, crc->rst_msk); + + /* clear reset bit */ + mtk_ddp_write_mask(&crc->cmdq_handle, 0, crc->cmdq_reg, 0, + crc->rst_ofs, crc->rst_msk); + + /* jump to head of the cmdq packet */ + cmdq_pkt_jump(&crc->cmdq_handle, crc->cmdq_handle.pa_base); + + return; +cleanup: + mtk_drm_crc_destroy(crc); +} + +void mtk_drm_crc_cmdq_start(struct mtk_drm_crc *crc) +{ + if (!crc->cmdq_client.chan) + return; + + dma_sync_single_for_device(crc->cmdq_client.chan->mbox->dev, + crc->cmdq_handle.pa_base, + crc->cmdq_handle.cmd_buf_size, + DMA_TO_DEVICE); + mbox_send_message(crc->cmdq_client.chan, &crc->cmdq_handle); + mbox_client_txdone(crc->cmdq_client.chan, 0); +} + +void mtk_drm_crc_cmdq_stop(struct mtk_drm_crc *crc) +{ + if (!crc->cmdq_client.chan) + return; + + mbox_flush(crc->cmdq_client.chan, 2000); +} +#endif diff --git a/drivers/gpu/drm/mediatek/mtk_drm_crtc.h b/drivers/gpu/drm/medi= atek/mtk_drm_crtc.h index 3c224595fa714..0683ec4bc26f6 100644 --- a/drivers/gpu/drm/mediatek/mtk_drm_crtc.h +++ b/drivers/gpu/drm/mediatek/mtk_drm_crtc.h @@ -15,6 +15,45 @@ #define MTK_MAX_BPC 10 #define MTK_MIN_BPC 3 =20 +/** + * struct mtk_drm_crc - crc related information + * @ofs: register offset of crc + * @rst_ofs: register offset of crc reset + * @rst_msk: register mask of crc reset + * @cnt: count of crc + * @va: pointer to the start of crc array + * @pa: physical address of the crc for gce to access + * @cmdq_event: the event to trigger the cmdq + * @cmdq_reg: address of the register that cmdq is going to access + * @cmdq_client: handler to control cmdq (mbox channel, thread ...etc.) + * @cmdq_handle: cmdq packet to store the commands + */ +struct mtk_drm_crc { + const u32 *ofs; + u32 rst_ofs; + u32 rst_msk; + size_t cnt; + u32 *va; +#if IS_REACHABLE(CONFIG_MTK_CMDQ) + dma_addr_t pa; + u32 cmdq_event; + struct cmdq_client_reg *cmdq_reg; + struct cmdq_client cmdq_client; + struct cmdq_pkt cmdq_handle; +#endif +}; + +void mtk_drm_crc_init(struct mtk_drm_crc *crc, + const u32 *crc_offset_table, size_t crc_count, + u32 reset_offset, u32 reset_mask); +void mtk_drm_crc_read(struct mtk_drm_crc *crc, void __iomem *reg); +void mtk_drm_crc_destroy(struct mtk_drm_crc *crc); +#if IS_REACHABLE(CONFIG_MTK_CMDQ) +void mtk_drm_crc_cmdq_create(struct device *dev, struct mtk_drm_crc *crc); +void mtk_drm_crc_cmdq_start(struct mtk_drm_crc *crc); +void mtk_drm_crc_cmdq_stop(struct mtk_drm_crc *crc); +#endif + void mtk_drm_crtc_commit(struct drm_crtc *crtc); int mtk_drm_crtc_create(struct drm_device *drm_dev, const unsigned int *path, diff --git a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h b/drivers/gpu/drm/= mediatek/mtk_drm_ddp_comp.h index 215b7234ff13c..231017470607e 100644 --- a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h +++ b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h @@ -87,6 +87,9 @@ struct mtk_ddp_comp_funcs { 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_d= isplay_mode *mode); + size_t (*crc_cnt)(struct device *dev); + u32 *(*crc_entry)(struct device *dev); + void (*crc_read)(struct device *dev); }; =20 struct mtk_ddp_comp { --=20 2.18.0