Re: [PATCH v9 15/22] drm/mediatek: dpi: Add dpintf support

Rex-BC Chen
2022-03-28T08:46:45Z

Hello Guillaume,

Thanks for your patch, but I have some questions for this patch:

On Mon, 2022-03-28 at 00:39 +0200, Guillaume Ranquet wrote:
> dpintf is the displayport interface hardware unit. This unit is
> similar
> to dpi and can reuse most of the code.
>
> This patch adds support for mt8195-dpintf to this dpi driver. Main
> differences are:
> - Some features/functional components are not available for dpintf
> which are now excluded from code execution once is_dpintf is set
> - dpintf can and needs to choose between different clockdividers
> based
> on the clockspeed. This is done by choosing a different clock
> parent.
> - There are two additional clocks that need to be managed. These are
> only set for dpintf and will be set to NULL if not supplied. The
> clk_* calls handle these as normal clocks then.
> - Some register contents differ slightly between the two components.
> To
> work around this I added register bits/masks with a DPINTF_ prefix
> and use them where different.
>
> Based on a separate driver for dpintf created by
> Jason-JH.Lin <jason-jh.lin@mediatek.com>.
>
> Signed-off-by: Markus Schneider-Pargmann <msp@baylibre.com>
> Signed-off-by: Guillaume Ranquet <granquet@baylibre.com>
> Reviewed-by: AngeloGioacchino Del Regno <
> angelogioacchino.delregno@collabora.com>
> ---
> drivers/gpu/drm/mediatek/mtk_dpi.c | 78 ++++++++++++++++++-
> --
> drivers/gpu/drm/mediatek/mtk_dpi_regs.h | 38 ++++++++++
> drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c | 8 +++
> drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h | 1 +
> drivers/gpu/drm/mediatek/mtk_drm_drv.c | 5 +-
> include/linux/soc/mediatek/mtk-mmsys.h | 2 +
> 6 files changed, 120 insertions(+), 12 deletions(-)
>
> diff --git a/drivers/gpu/drm/mediatek/mtk_dpi.c
> b/drivers/gpu/drm/mediatek/mtk_dpi.c
> index eb969c5c5c2e..8198d3cf23ac 100644
> --- a/drivers/gpu/drm/mediatek/mtk_dpi.c
> +++ b/drivers/gpu/drm/mediatek/mtk_dpi.c
> @@ -126,6 +126,7 @@ struct mtk_dpi_conf {
> const u32 *output_fmts;
> u32 num_output_fmts;
> bool is_ck_de_pol;
> + bool is_dpintf;
> bool swap_input_support;
> /* Mask used for HWIDTH, HPORCH, VSYNC_WIDTH and VSYNC_PORCH
> (no shift) */
> u32 dimension_mask;
> @@ -498,11 +499,11 @@ static int mtk_dpi_set_display_mode(struct
> mtk_dpi *dpi,
>
> vm.pixelclock = pll_rate / factor;
> if ((dpi->output_fmt == MEDIA_BUS_FMT_RGB888_2X12_LE) ||
> - (dpi->output_fmt == MEDIA_BUS_FMT_RGB888_2X12_BE))
> + (dpi->output_fmt == MEDIA_BUS_FMT_RGB888_2X12_BE)) {
> clk_set_rate(dpi->pixel_clk, vm.pixelclock * 2);
> - else
> + } else {
> clk_set_rate(dpi->pixel_clk, vm.pixelclock);
> -
> + }
>
> vm.pixelclock = clk_get_rate(dpi->pixel_clk);
>
> @@ -515,9 +516,15 @@ static int mtk_dpi_set_display_mode(struct
> mtk_dpi *dpi,
> MTK_DPI_POLARITY_FALLING :
> MTK_DPI_POLARITY_RISING;
> dpi_pol.vsync_pol = vm.flags & DISPLAY_FLAGS_VSYNC_HIGH ?
> MTK_DPI_POLARITY_FALLING :
> MTK_DPI_POLARITY_RISING;
> - hsync.sync_width = vm.hsync_len;
> - hsync.back_porch = vm.hback_porch;
> - hsync.front_porch = vm.hfront_porch;
> + if (dpi->conf->is_dpintf) {
> + hsync.sync_width = vm.hsync_len / 4;
> + hsync.back_porch = vm.hback_porch / 4;
> + hsync.front_porch = vm.hfront_porch / 4;
> + } else {
> + hsync.sync_width = vm.hsync_len;
> + hsync.back_porch = vm.hback_porch;
> + hsync.front_porch = vm.hfront_porch;
> + }
> hsync.shift_half_line = false;
> vsync_lodd.sync_width = vm.vsync_len;
> vsync_lodd.back_porch = vm.vback_porch;
> @@ -559,13 +566,20 @@ static int mtk_dpi_set_display_mode(struct
> mtk_dpi *dpi,
> mtk_dpi_config_channel_limit(dpi);
> mtk_dpi_config_bit_num(dpi, dpi->bit_num);
> mtk_dpi_config_channel_swap(dpi, dpi->channel_swap);
> - mtk_dpi_config_yc_map(dpi, dpi->yc_map);
> mtk_dpi_config_color_format(dpi, dpi->color_format);
> - mtk_dpi_config_2n_h_fre(dpi);
> - mtk_dpi_dual_edge(dpi);
> - mtk_dpi_config_disable_edge(dpi);
> + if (dpi->conf->is_dpintf) {
> + mtk_dpi_mask(dpi, DPI_CON, DPINTF_INPUT_2P_EN,
> + DPINTF_INPUT_2P_EN);
> + } else {
> + mtk_dpi_config_yc_map(dpi, dpi->yc_map);
> + mtk_dpi_config_2n_h_fre(dpi);
> + mtk_dpi_dual_edge(dpi);
> + mtk_dpi_config_disable_edge(dpi);
> + }
> mtk_dpi_sw_reset(dpi, false);
>
> + mtk_dpi_enable(dpi);

Why do we need to add mtk_dpi_enable() here?
Will this change the power on sequence?

BRs,
Rex
> +
> return 0;
> }
>
> @@ -642,7 +656,10 @@ static int mtk_dpi_bridge_atomic_check(struct
> drm_bridge *bridge,
> dpi->bit_num = MTK_DPI_OUT_BIT_NUM_8BITS;
> dpi->channel_swap = MTK_DPI_OUT_CHANNEL_SWAP_RGB;
> dpi->yc_map = MTK_DPI_OUT_YC_MAP_RGB;
> - dpi->color_format = MTK_DPI_COLOR_FORMAT_RGB;
> + if (out_bus_format == MEDIA_BUS_FMT_YUYV8_1X16)
> + dpi->color_format =
> MTK_DPI_COLOR_FORMAT_YCBCR_422_FULL;
> + else
> + dpi->color_format = MTK_DPI_COLOR_FORMAT_RGB;
>
> return 0;
> }
> @@ -801,6 +818,16 @@ static unsigned int mt8183_calculate_factor(int
> clock)
> return 2;
> }
>
> +static unsigned int mt8195_dpintf_calculate_factor(int clock)
> +{
> + if (clock < 70000)
> + return 4;
> + else if (clock < 200000)
> + return 2;
> + else
> + return 1;
> +}
> +
> static const u32 mt8173_output_fmts[] = {
> MEDIA_BUS_FMT_RGB888_1X24,
> };
> @@ -810,6 +837,12 @@ static const u32 mt8183_output_fmts[] = {
> MEDIA_BUS_FMT_RGB888_2X12_BE,
> };
>
> +static const u32 mt8195_output_fmts[] = {
> + MEDIA_BUS_FMT_RGB888_1X24,
> + MEDIA_BUS_FMT_YUV8_1X24,
> + MEDIA_BUS_FMT_YUYV8_1X16,
> +};
> +
> static const struct mtk_dpi_yc_limit mtk_dpi_limit = {
> .c_bottom = 0x0010,
> .c_top = 0x0FE0,
> @@ -817,6 +850,13 @@ static const struct mtk_dpi_yc_limit
> mtk_dpi_limit = {
> .y_top = 0x0FE0,
> };
>
> +static const struct mtk_dpi_yc_limit mtk_dpintf_limit = {
> + .c_bottom = 0x0000,
> + .c_top = 0xFFF,
> + .y_bottom = 0x0000,
> + .y_top = 0xFFF,
> +};
> +
> static const struct mtk_dpi_conf mt8173_conf = {
> .cal_factor = mt8173_calculate_factor,
> .reg_h_fre_con = 0xe0,
> @@ -882,6 +922,19 @@ static const struct mtk_dpi_conf mt8192_conf = {
> .limit = &mtk_dpi_limit,
> };
>
> +static const struct mtk_dpi_conf mt8195_dpintf_conf = {
> + .cal_factor = mt8195_dpintf_calculate_factor,
> + .output_fmts = mt8195_output_fmts,
> + .num_output_fmts = ARRAY_SIZE(mt8195_output_fmts),
> + .is_dpintf = true,
> + .dimension_mask = DPINTF_HPW_MASK,
> + .hvsize_mask = DPINTF_HSIZE_MASK,
> + .channel_swap_shift = DPINTF_CH_SWAP,
> + .yuv422_en_bit = DPINTF_YUV422_EN,
> + .csc_enable_bit = DPINTF_CSC_ENABLE,
> + .limit = &mtk_dpintf_limit,
> +};
> +
> static int mtk_dpi_probe(struct platform_device *pdev)
> {
> struct device *dev = &pdev->dev;
> @@ -1004,6 +1057,9 @@ static const struct of_device_id
> mtk_dpi_of_ids[] = {
> { .compatible = "mediatek,mt8192-dpi",
> .data = &mt8192_conf,
> },
> + { .compatible = "mediatek,mt8195-dpintf",
> + .data = &mt8195_dpintf_conf,
> + },
> { },
> };
> MODULE_DEVICE_TABLE(of, mtk_dpi_of_ids);
> diff --git a/drivers/gpu/drm/mediatek/mtk_dpi_regs.h
> b/drivers/gpu/drm/mediatek/mtk_dpi_regs.h
> index 3a02fabe1662..91b32dfffced 100644
> --- a/drivers/gpu/drm/mediatek/mtk_dpi_regs.h
> +++ b/drivers/gpu/drm/mediatek/mtk_dpi_regs.h
> @@ -40,10 +40,15 @@
> #define FAKE_DE_LEVEN BIT(21)
> #define FAKE_DE_RODD BIT(22)
> #define FAKE_DE_REVEN BIT(23)
> +#define DPINTF_YUV422_EN BIT(24)
> +#define DPINTF_CSC_ENABLE BIT(26)
> +#define DPINTF_INPUT_2P_EN BIT(29)
>
> #define DPI_OUTPUT_SETTING 0x14
> #define CH_SWAP 0
> +#define DPINTF_CH_SWAP BIT(1)
> #define CH_SWAP_MASK (0x7 << 0)
> +#define DPINTF_CH_SWAP_MASK (0x7 << 1)
> #define SWAP_RGB 0x00
> #define SWAP_GBR 0x01
> #define SWAP_BRG 0x02
> @@ -80,8 +85,10 @@
> #define DPI_SIZE 0x18
> #define HSIZE 0
> #define HSIZE_MASK (0x1FFF << 0)
> +#define DPINTF_HSIZE_MASK (0xFFFF << 0)
> #define VSIZE 16
> #define VSIZE_MASK (0x1FFF << 16)
> +#define DPINTF_VSIZE_MASK (0xFFFF << 16)
>
> #define DPI_DDR_SETTING 0x1C
> #define DDR_EN BIT(0)
> @@ -93,24 +100,30 @@
> #define DPI_TGEN_HWIDTH 0x20
> #define HPW 0
> #define HPW_MASK (0xFFF << 0)
> +#define DPINTF_HPW_MASK (0xFFFF << 0)
>
> #define DPI_TGEN_HPORCH 0x24
> #define HBP 0
> #define HBP_MASK (0xFFF << 0)
> +#define DPINTF_HBP_MASK (0xFFFF << 0)
> #define HFP 16
> #define HFP_MASK (0xFFF << 16)
> +#define DPINTF_HFP_MASK (0xFFFF << 16)
>
> #define DPI_TGEN_VWIDTH 0x28
> #define DPI_TGEN_VPORCH 0x2C
>
> #define VSYNC_WIDTH_SHIFT 0
> #define VSYNC_WIDTH_MASK (0xFFF << 0)
> +#define DPINTF_VSYNC_WIDTH_MASK (0xFFFF << 0)
> #define VSYNC_HALF_LINE_SHIFT 16
> #define VSYNC_HALF_LINE_MASK BIT(16)
> #define VSYNC_BACK_PORCH_SHIFT 0
> #define VSYNC_BACK_PORCH_MASK (0xFFF << 0)
> +#define DPINTF_VSYNC_BACK_PORCH_MASK (0xFFFF << 0)
> #define VSYNC_FRONT_PORCH_SHIFT 16
> #define VSYNC_FRONT_PORCH_MASK (0xFFF << 16)
> +#define DPINTF_VSYNC_FRONT_PORCH_MASK (0xFFFF << 16)
>
> #define DPI_BG_HCNTL 0x30
> #define BG_RIGHT (0x1FFF << 0)
> @@ -217,4 +230,29 @@
>
> #define EDGE_SEL_EN BIT(5)
> #define H_FRE_2N BIT(25)
> +
> +#define DPI_MATRIX_SET 0xB4
> +#define INT_MATRIX_SEL BIT(0)
> +#define INT_MATRIX_SEL_MASK (0x1F << 0)
> +#define RGB_TO_JPEG 0x00
> +#define RGB_TO_FULL709 0x01
> +#define RGB_TO_BT601 0x02
> +#define RGB_TO_BT709 0x03
> +#define JPEG_TO_RGB 0x04
> +#define FULL709_TO_RGB 0x05
> +#define BT601_TO_RGB 0x06
> +#define BT709_TO_RGB 0x07
> +#define JPEG_TO_BT601 0x08
> +#define JPEG_TO_BT709 0x09
> +#define BT601_TO_JPEG 0xA
> +#define BT709_TO_JPEG 0xB
> +#define BT709_TO_BT601 0xC
> +#define BT601_TO_BT709 0xD
> +#define JPEG_TO_CERGB 0x14
> +#define FULL709_TO_CERGB 0x15
> +#define BT601_TO_CERGB 0x16
> +#define BT709_TO_CERGB 0x17
> +#define RGB_TO_CERGB 0x1C
> +#define MATRIX_BIT BIT(8)
> +#define EXT_MATRIX_EN BIT(12)
> #endif /* __MTK_DPI_REGS_H */
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c
> b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c
> index 2e99aee13dfe..558fc2733358 100644
> --- a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c
> @@ -351,6 +351,11 @@ static const char * const
> mtk_ddp_comp_stem[MTK_DDP_COMP_TYPE_MAX] = {
> [MTK_DISP_WDMA] = "wdma",
> [MTK_DPI] = "dpi",
> [MTK_DSI] = "dsi",
> + [MTK_DP_INTF] = "dp-intf",
> + [MTK_DISP_PWM] = "pwm",
> + [MTK_DISP_MUTEX] = "mutex",
> + [MTK_DISP_OD] = "od",
> + [MTK_DISP_BLS] = "bls",
> };
>
> struct mtk_ddp_comp_match {
> @@ -369,6 +374,8 @@ 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_DP_INTF0] = { MTK_DP_INTF, 0, &ddp_dpi
> },
> + [DDP_COMPONENT_DP_INTF1] = { MTK_DP_INTF, 1, &ddp_dpi
> },
> [DDP_COMPONENT_DSI0] = { MTK_DSI, 0,
> &ddp_dsi },
> [DDP_COMPONENT_DSI1] = { MTK_DSI, 1,
> &ddp_dsi },
> [DDP_COMPONENT_DSI2] = { MTK_DSI, 2,
> &ddp_dsi },
> @@ -481,6 +488,7 @@ int mtk_ddp_comp_init(struct device_node *node,
> struct mtk_ddp_comp *comp,
> type == MTK_DISP_PWM ||
> type == MTK_DISP_RDMA ||
> type == MTK_DPI ||
> + type == MTK_DP_INTF ||
> type == MTK_DSI)
> return 0;
>
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h
> b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h
> index ad267bb8fc9b..43ad74be509e 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_UFOE,
> MTK_DISP_WDMA,
> MTK_DPI,
> + MTK_DP_INTF,
> MTK_DSI,
> 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 247c6ff277ef..c8a233f609f0 100644
> --- a/drivers/gpu/drm/mediatek/mtk_drm_drv.c
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_drv.c
> @@ -509,6 +509,8 @@ static const struct of_device_id
> mtk_ddp_comp_dt_ids[] = {
> .data = (void *)MTK_DPI },
> { .compatible = "mediatek,mt8183-dpi",
> .data = (void *)MTK_DPI },
> + { .compatible = "mediatek,mt8195-dpintf",
> + .data = (void *)MTK_DP_INTF },
> { .compatible = "mediatek,mt2701-dsi",
> .data = (void *)MTK_DSI },
> { .compatible = "mediatek,mt8173-dsi",
> @@ -609,7 +611,8 @@ static int mtk_drm_probe(struct platform_device
> *pdev)
> comp_type == MTK_DISP_OVL_2L ||
> comp_type == MTK_DISP_RDMA ||
> comp_type == MTK_DPI ||
> - comp_type == MTK_DSI) {
> + comp_type == MTK_DPI ||
> + comp_type == MTK_DP_INTF) {
> dev_info(dev, "Adding component match for
> %pOF\n",
> node);
> drm_of_component_match_add(dev, &match,
> component_compare_of,
> diff --git a/include/linux/soc/mediatek/mtk-mmsys.h
> b/include/linux/soc/mediatek/mtk-mmsys.h
> index 4bba275e235a..56ed2fa5f59e 100644
> --- a/include/linux/soc/mediatek/mtk-mmsys.h
> +++ b/include/linux/soc/mediatek/mtk-mmsys.h
> @@ -19,6 +19,8 @@ enum mtk_ddp_comp_id {
> DDP_COMPONENT_DITHER,
> DDP_COMPONENT_DPI0,
> DDP_COMPONENT_DPI1,
> + DDP_COMPONENT_DP_INTF0,
> + DDP_COMPONENT_DP_INTF1,
> DDP_COMPONENT_DSI0,
> DDP_COMPONENT_DSI1,
> DDP_COMPONENT_DSI2,