Re: [PATCH v3 11/12] drm/mediatek: add DSC support for MT8195

From: Chun-Kuang Hu
Date: Thu Jul 15 2021 - 19:21:31 EST

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Hi, Jason:

jason-jh.lin <jason-jh.lin@xxxxxxxxxxxx> 於 2021年7月16日週五上午1:38寫道：
>
> Add DSC module file:
> DSC is designed for real-time systems with real-time compression,
> transmission, decompression and display.
> The DSC standard is a specification of the algorithms used for
> compressing and decompressing image display streams, including
> the specification of the syntax and semantics of the compressed
> video bit stream.
>
> Signed-off-by: jason-jh.lin <jason-jh.lin@xxxxxxxxxxxx>
> ---
> drivers/gpu/drm/mediatek/Makefile | 1 +
> drivers/gpu/drm/mediatek/mtk_disp_drv.h | 8 +
> drivers/gpu/drm/mediatek/mtk_disp_dsc.c | 161 ++++++++++++++++++++
> drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c | 19 ++-
> drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h | 1 +
> drivers/gpu/drm/mediatek/mtk_drm_drv.c | 8 +-
> drivers/gpu/drm/mediatek/mtk_drm_drv.h | 1 +
> 7 files changed, 194 insertions(+), 5 deletions(-)
> create mode 100644 drivers/gpu/drm/mediatek/mtk_disp_dsc.c
>
> diff --git a/drivers/gpu/drm/mediatek/Makefile b/drivers/gpu/drm/mediatek/Makefile
> index dc54a7a69005..44948e221fd3 100644
> --- a/drivers/gpu/drm/mediatek/Makefile
> +++ b/drivers/gpu/drm/mediatek/Makefile
> @@ -2,6 +2,7 @@
>
> mediatek-drm-y := mtk_disp_ccorr.o \
> mtk_disp_color.o \
> + mtk_disp_dsc.o \
> mtk_disp_gamma.o \
> mtk_disp_ovl.o \
> mtk_disp_rdma.o \
> diff --git a/drivers/gpu/drm/mediatek/mtk_disp_drv.h b/drivers/gpu/drm/mediatek/mtk_disp_drv.h
> index cafd9df2d63b..c7e9bd370acd 100644
> --- a/drivers/gpu/drm/mediatek/mtk_disp_drv.h
> +++ b/drivers/gpu/drm/mediatek/mtk_disp_drv.h
> @@ -33,6 +33,14 @@ void mtk_dither_set_common(void __iomem *regs, struct cmdq_client_reg *cmdq_reg,
> void mtk_dpi_start(struct device *dev);
> void mtk_dpi_stop(struct device *dev);
>
> +int mtk_dsc_clk_enable(struct device *dev);
> +void mtk_dsc_clk_disable(struct device *dev);
> +void mtk_dsc_config(struct device *dev, unsigned int width,
> + unsigned int height, unsigned int vrefresh,
> + unsigned int bpc, struct cmdq_pkt *cmdq_pkt);
> +void mtk_dsc_start(struct device *dev);
> +void mtk_dsc_stop(struct device *dev);
> +
> void mtk_dsi_ddp_start(struct device *dev);
> void mtk_dsi_ddp_stop(struct device *dev);
>
> diff --git a/drivers/gpu/drm/mediatek/mtk_disp_dsc.c b/drivers/gpu/drm/mediatek/mtk_disp_dsc.c
> new file mode 100644
> index 000000000000..6a196220c532
> --- /dev/null
> +++ b/drivers/gpu/drm/mediatek/mtk_disp_dsc.c
> @@ -0,0 +1,161 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright (c) 2021 MediaTek Inc.
> + */
> +
> +#include <linux/clk.h>
> +#include <linux/component.h>
> +#include <linux/of_device.h>
> +#include <linux/of_irq.h>
> +#include <linux/platform_device.h>
> +#include <linux/soc/mediatek/mtk-cmdq.h>
> +
> +#include "mtk_drm_crtc.h"
> +#include "mtk_drm_ddp_comp.h"
> +#include "mtk_drm_gem.h"
> +#include "mtk_disp_drv.h"
> +
> +#define DISP_REG_DSC_CON 0x0000
> +#define DSC_EN BIT(0)
> +#define DSC_DUAL_INOUT BIT(2)
> +#define DSC_BYPASS BIT(4)
> +#define DSC_UFOE_SEL BIT(16)
> +
> +/**
> + * struct mtk_disp_dsc - DISP_DSC driver structure
> + * @clk - clk of dsc hardware
> + * @regs - hardware register address of dsc
> + * @cmdq_reg - structure containing cmdq hardware resource
> + */
> +struct mtk_disp_dsc {
> + struct clk *clk;
> + void __iomem *regs;
> + struct cmdq_client_reg cmdq_reg;
> +};

Squash mtk_disp_dsc.c into mtk_drm_ddp_comp.c and this patch would be
much simpler.

> +
> +void mtk_dsc_start(struct device *dev)
> +{
> + struct mtk_disp_dsc *dsc = dev_get_drvdata(dev);
> + void __iomem *baddr = dsc->regs;

baddr is used only once, so use dsc->regs directly.

> +
> + mtk_ddp_write_mask(NULL, DSC_EN, &dsc->cmdq_reg, baddr,
> + DISP_REG_DSC_CON, DSC_EN);
> +}
> +
> +void mtk_dsc_stop(struct device *dev)
> +{
> + struct mtk_disp_dsc *dsc = dev_get_drvdata(dev);
> + void __iomem *baddr = dsc->regs;

Ditto.

> +
> + mtk_ddp_write_mask(NULL, 0x0, &dsc->cmdq_reg, baddr,
> + DISP_REG_DSC_CON, DSC_EN);
> +}
> +
> +int mtk_dsc_clk_enable(struct device *dev)
> +{
> + struct mtk_disp_dsc *dsc = dev_get_drvdata(dev);
> +
> + return clk_prepare_enable(dsc->clk);
> +}
> +
> +void mtk_dsc_clk_disable(struct device *dev)
> +{
> + struct mtk_disp_dsc *dsc = dev_get_drvdata(dev);
> +
> + clk_disable_unprepare(dsc->clk);
> +}
> +
> +void mtk_dsc_config(struct device *dev, unsigned int w,
> + unsigned int h, unsigned int vrefresh,
> + unsigned int bpc, struct cmdq_pkt *handle)
> +{
> + struct mtk_disp_dsc *dsc = dev_get_drvdata(dev);
> +
> + /* dsc bypass mode */
> + mtk_ddp_write_mask(handle, DSC_BYPASS, &dsc->cmdq_reg, dsc->regs,
> + DISP_REG_DSC_CON, DSC_BYPASS);
> + mtk_ddp_write_mask(handle, DSC_UFOE_SEL, &dsc->cmdq_reg, dsc->regs,
> + DISP_REG_DSC_CON, DSC_UFOE_SEL);
> + mtk_ddp_write_mask(handle, DSC_DUAL_INOUT, &dsc->cmdq_reg, dsc->regs,
> + DISP_REG_DSC_CON, DSC_DUAL_INOUT);
> +}
> +
> +static int mtk_disp_dsc_bind(struct device *dev, struct device *master,
> + void *data)
> +{
> + return 0;
> +}
> +
> +static void mtk_disp_dsc_unbind(struct device *dev, struct device *master,
> + void *data)
> +{
> +}
> +
> +static const struct component_ops mtk_disp_dsc_component_ops = {
> + .bind = mtk_disp_dsc_bind,
> + .unbind = mtk_disp_dsc_unbind,
> +};
> +
> +static int mtk_disp_dsc_probe(struct platform_device *pdev)
> +{
> + struct device *dev = &pdev->dev;
> + struct resource *res;
> + struct mtk_disp_dsc *priv;
> + int irq;
> + int ret;
> +
> + priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
> + if (!priv)
> + return -ENOMEM;
> +
> + priv->clk = devm_clk_get(dev, NULL);
> + if (IS_ERR(priv->clk)) {
> + dev_err(dev, "failed to get dsc clk\n");
> + return PTR_ERR(priv->clk);
> + }
> +
> + res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> + priv->regs = devm_ioremap_resource(dev, res);
> + if (IS_ERR(priv->regs)) {
> + dev_err(dev, "failed to ioremap dsc\n");
> + return PTR_ERR(priv->regs);
> + }
> +
> +#if IS_REACHABLE(CONFIG_MTK_CMDQ)
> + ret = cmdq_dev_get_client_reg(dev, &priv->cmdq_reg, 0);
> + if (ret)
> + dev_dbg(dev, "get mediatek,gce-client-reg fail!\n");
> +#endif
> +
> + platform_set_drvdata(pdev, priv);
> +
> + ret = component_add(dev, &mtk_disp_dsc_component_ops);
> + if (ret != 0)
> + dev_err(dev, "Failed to add component: %d\n", ret);
> +
> + return ret;
> +}
> +
> +static int mtk_disp_dsc_remove(struct platform_device *pdev)
> +{
> + component_del(&pdev->dev, &mtk_disp_dsc_component_ops);
> +
> + return 0;
> +}
> +
> +static const struct of_device_id mtk_disp_dsc_driver_dt_match[] = {
> + { .compatible = "mediatek,mt8195-disp-dsc", },
> + {},
> +};
> +
> +MODULE_DEVICE_TABLE(of, mtk_disp_dsc_driver_dt_match);
> +
> +struct platform_driver mtk_disp_dsc_driver = {
> + .probe = mtk_disp_dsc_probe,
> + .remove = mtk_disp_dsc_remove,
> + .driver = {
> + .name = "mediatek-disp-dsc",
> + .owner = THIS_MODULE,
> + .of_match_table = mtk_disp_dsc_driver_dt_match,
> + },
> +};
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c
> index 75bc00e17fc4..ba3d7a1ce7ab 100644
> --- a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c
> @@ -333,6 +333,14 @@ static const struct mtk_ddp_comp_funcs ddp_rdma = {
> .layer_config = mtk_rdma_layer_config,
> };
>
> +static const struct mtk_ddp_comp_funcs ddp_dsc = {
> + .config = mtk_dsc_config,
> + .start = mtk_dsc_start,
> + .stop = mtk_dsc_stop,
> + .clk_enable = mtk_dsc_clk_enable,
> + .clk_disable = mtk_dsc_clk_disable,
> +};
> +
> static const struct mtk_ddp_comp_funcs ddp_ufoe = {
> .clk_enable = mtk_ddp_clk_enable,
> .clk_disable = mtk_ddp_clk_disable,
> @@ -356,6 +364,7 @@ static const char * const mtk_ddp_comp_stem[MTK_DDP_COMP_TYPE_MAX] = {
> [MTK_DISP_MUTEX] = "mutex",
> [MTK_DISP_OD] = "od",
> [MTK_DISP_BLS] = "bls",
> + [MTK_DISP_DSC] = "dsc",
> };
>
> struct mtk_ddp_comp_match {
> @@ -374,6 +383,9 @@ static const struct mtk_ddp_comp_match mtk_ddp_matches[DDP_COMPONENT_ID_MAX] = {
> [DDP_COMPONENT_DITHER] = { MTK_DISP_DITHER, 0, &ddp_dither },
> [DDP_COMPONENT_DPI0] = { MTK_DPI, 0, &ddp_dpi },
> [DDP_COMPONENT_DPI1] = { MTK_DPI, 1, &ddp_dpi },
> + [DDP_COMPONENT_DSC0] = { MTK_DISP_DSC, 0, &ddp_dsc },
> + [DDP_COMPONENT_DSC1] = { MTK_DISP_DSC, 1, &ddp_dsc },
> + [DDP_COMPONENT_DSC1_VIRTUAL0] = { MTK_DISP_DSC, -1, &ddp_dsc },

What is DDP_COMPONENT_DSC1_VIRTUAL0? If use less, remove it.

> [DDP_COMPONENT_DSI0] = { MTK_DSI, 0, &ddp_dsi },
> [DDP_COMPONENT_DSI1] = { MTK_DSI, 1, &ddp_dsi },
> [DDP_COMPONENT_DSI2] = { MTK_DSI, 2, &ddp_dsi },
> @@ -508,13 +520,14 @@ int mtk_ddp_comp_init(struct device_node *node, struct mtk_ddp_comp *comp,
> if (type == MTK_DISP_BLS ||
> type == MTK_DISP_CCORR ||
> type == MTK_DISP_COLOR ||
> + type == MTK_DISP_DSC ||
> type == MTK_DISP_GAMMA ||
> - type == MTK_DPI ||
> - type == MTK_DSI ||
> type == MTK_DISP_OVL ||
> type == MTK_DISP_OVL_2L ||
> type == MTK_DISP_PWM ||
> - type == MTK_DISP_RDMA)
> + type == MTK_DISP_RDMA ||
> + type == MTK_DPI ||
> + type == MTK_DSI)

Moving MTK_DPI and MTK_DSI is not related to DSC, so move this
modification to another patch.

> return 0;
>
> priv = devm_kzalloc(comp->dev, sizeof(*priv), GFP_KERNEL);
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h
> index bb914d976cf5..661fb620e266 100644
> --- a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h
> @@ -34,6 +34,7 @@ enum mtk_ddp_comp_type {
> MTK_DISP_MUTEX,
> MTK_DISP_OD,
> MTK_DISP_BLS,
> + MTK_DISP_DSC,
> MTK_DDP_COMP_TYPE_MAX,
> };
>
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_drv.c b/drivers/gpu/drm/mediatek/mtk_drm_drv.c
> index d6f6d1bdad85..990a54049a7d 100644
> --- a/drivers/gpu/drm/mediatek/mtk_drm_drv.c
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_drv.c
> @@ -446,6 +446,8 @@ static const struct of_device_id mtk_ddp_comp_dt_ids[] = {
> .data = (void *)MTK_DISP_GAMMA, },
> { .compatible = "mediatek,mt8183-disp-dither",
> .data = (void *)MTK_DISP_DITHER },
> + { .compatible = "mediatek,mt8195-disp-dsc",
> + .data = (void *)MTK_DISP_DSC },
> { .compatible = "mediatek,mt8173-disp-ufoe",
> .data = (void *)MTK_DISP_UFOE },
> { .compatible = "mediatek,mt2701-dsi",
> @@ -562,12 +564,13 @@ static int mtk_drm_probe(struct platform_device *pdev)
> */
> if (comp_type == MTK_DISP_CCORR ||
> comp_type == MTK_DISP_COLOR ||
> + comp_type == MTK_DISP_DSC ||
> comp_type == MTK_DISP_GAMMA ||
> comp_type == MTK_DISP_OVL ||
> comp_type == MTK_DISP_OVL_2L ||
> comp_type == MTK_DISP_RDMA ||
> - comp_type == MTK_DSI ||
> - comp_type == MTK_DPI) {
> + comp_type == MTK_DPI ||
> + comp_type == MTK_DSI) {
> dev_info(dev, "Adding component match for %pOF\n",
> node);
> drm_of_component_match_add(dev, &match, compare_of,
> @@ -662,6 +665,7 @@ static struct platform_driver mtk_drm_platform_driver = {
> static struct platform_driver * const mtk_drm_drivers[] = {
> &mtk_disp_ccorr_driver,
> &mtk_disp_color_driver,
> + &mtk_disp_dsc_driver,
> &mtk_disp_gamma_driver,
> &mtk_disp_ovl_driver,
> &mtk_disp_rdma_driver,
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_drv.h b/drivers/gpu/drm/mediatek/mtk_drm_drv.h
> index 637f5669e895..8b722330ef7d 100644
> --- a/drivers/gpu/drm/mediatek/mtk_drm_drv.h
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_drv.h
> @@ -51,6 +51,7 @@ extern struct platform_driver mtk_disp_color_driver;
> extern struct platform_driver mtk_disp_gamma_driver;
> extern struct platform_driver mtk_disp_ovl_driver;
> extern struct platform_driver mtk_disp_rdma_driver;
> +extern struct platform_driver mtk_disp_dsc_driver;

Alphabetic order.

Regards,
Chun-Kuang.

> extern struct platform_driver mtk_dpi_driver;
> extern struct platform_driver mtk_dsi_driver;
>
> --
> 2.18.0
>

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Previous message: Luis Chamberlain: "Re: [PATCH] firmware_loader: Fix use-after-free Read in firmware_loading_store"
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