[PATCH v8 13/19] drm/mediatek: dpi: Add dpintf support
AngeloGioacchino Del Regno
angelogioacchino.delregno at collabora.com
Mon Feb 21 06:30:40 PST 2022
Il 18/02/22 15:54, Guillaume Ranquet ha scritto:
> 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 at mediatek.com>.
>
> Signed-off-by: Markus Schneider-Pargmann <msp at baylibre.com>
> Signed-off-by: Guillaume Ranquet <granquet at baylibre.com>
> ---
> drivers/gpu/drm/mediatek/mtk_dpi.c | 164 +++++++++++++++++---
> 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, 198 insertions(+), 20 deletions(-)
>
> diff --git a/drivers/gpu/drm/mediatek/mtk_dpi.c b/drivers/gpu/drm/mediatek/mtk_dpi.c
> index be99399faf1bb..c5639ada868f8 100644
> --- a/drivers/gpu/drm/mediatek/mtk_dpi.c
> +++ b/drivers/gpu/drm/mediatek/mtk_dpi.c
> @@ -63,6 +63,14 @@ enum mtk_dpi_out_color_format {
> MTK_DPI_COLOR_FORMAT_YCBCR_422_FULL
> };
>
> +enum TVDPLL_CLK {
> + TVDPLL_PLL = 0,
> + TVDPLL_D2 = 2,
> + TVDPLL_D4 = 4,
> + TVDPLL_D8 = 8,
> + TVDPLL_D16 = 16,
> +};
> +
> struct mtk_dpi {
> struct drm_encoder encoder;
> struct drm_bridge bridge;
> @@ -71,8 +79,10 @@ struct mtk_dpi {
> void __iomem *regs;
> struct device *dev;
> struct clk *engine_clk;
> + struct clk *dpi_ck_cg;
> struct clk *pixel_clk;
> struct clk *tvd_clk;
> + struct clk *pclk_src[5];
> int irq;
> struct drm_display_mode mode;
> const struct mtk_dpi_conf *conf;
> @@ -126,6 +136,7 @@ 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;
> @@ -384,6 +395,25 @@ static void mtk_dpi_config_disable_edge(struct mtk_dpi *dpi)
> mtk_dpi_mask(dpi, dpi->conf->reg_h_fre_con, 0, EDGE_SEL_EN);
> }
>
> +static void mtk_dpi_matrix_sel(struct mtk_dpi *dpi, enum mtk_dpi_out_color_format format)
> +{
> + u32 matrix_sel = 0;
> +
> + switch (format) {
> + case MTK_DPI_COLOR_FORMAT_YCBCR_422:
> + case MTK_DPI_COLOR_FORMAT_YCBCR_422_FULL:
> + case MTK_DPI_COLOR_FORMAT_YCBCR_444:
> + case MTK_DPI_COLOR_FORMAT_YCBCR_444_FULL:
> + case MTK_DPI_COLOR_FORMAT_XV_YCC:
> + if (dpi->mode.hdisplay <= 720)
> + matrix_sel = 0x2;
> + break;
> + default:
> + break;
> + }
> + mtk_dpi_mask(dpi, DPI_MATRIX_SET, matrix_sel, INT_MATRIX_SEL_MASK);
> +}
> +
> static void mtk_dpi_config_color_format(struct mtk_dpi *dpi,
> enum mtk_dpi_out_color_format format)
> {
> @@ -391,6 +421,7 @@ static void mtk_dpi_config_color_format(struct mtk_dpi *dpi,
> (format == MTK_DPI_COLOR_FORMAT_YCBCR_444_FULL)) {
> mtk_dpi_config_yuv422_enable(dpi, false);
> mtk_dpi_config_csc_enable(dpi, true);
> + mtk_dpi_matrix_sel(dpi, format);
> if (dpi->conf->swap_input_support)
> mtk_dpi_config_swap_input(dpi, false);
> mtk_dpi_config_channel_swap(dpi, MTK_DPI_OUT_CHANNEL_SWAP_BGR);
> @@ -398,6 +429,7 @@ static void mtk_dpi_config_color_format(struct mtk_dpi *dpi,
> (format == MTK_DPI_COLOR_FORMAT_YCBCR_422_FULL)) {
> mtk_dpi_config_yuv422_enable(dpi, true);
> mtk_dpi_config_csc_enable(dpi, true);
> + mtk_dpi_matrix_sel(dpi, format);
> if (dpi->conf->swap_input_support)
> mtk_dpi_config_swap_input(dpi, true);
> mtk_dpi_config_channel_swap(dpi, MTK_DPI_OUT_CHANNEL_SWAP_RGB);
> @@ -438,6 +470,8 @@ static void mtk_dpi_power_off(struct mtk_dpi *dpi)
> mtk_dpi_disable(dpi);
> clk_disable_unprepare(dpi->pixel_clk);
> clk_disable_unprepare(dpi->engine_clk);
> + clk_disable_unprepare(dpi->dpi_ck_cg);
> + clk_disable_unprepare(dpi->tvd_clk);
> }
>
> static int mtk_dpi_power_on(struct mtk_dpi *dpi)
> @@ -447,12 +481,24 @@ static int mtk_dpi_power_on(struct mtk_dpi *dpi)
> if (++dpi->refcount != 1)
> return 0;
>
> + ret = clk_prepare_enable(dpi->tvd_clk);
> + if (ret) {
> + dev_err(dpi->dev, "Failed to enable tvd pll: %d\n", ret);
> + goto err_pixel;
> + }
> +
> ret = clk_prepare_enable(dpi->engine_clk);
> if (ret) {
> dev_err(dpi->dev, "Failed to enable engine clock: %d\n", ret);
> goto err_refcount;
> }
>
> + ret = clk_prepare_enable(dpi->dpi_ck_cg);
> + if (ret) {
> + dev_err(dpi->dev, "Failed to enable dpi_ck_cg clock: %d\n", ret);
> + goto err_ck_cg;
> + }
> +
> ret = clk_prepare_enable(dpi->pixel_clk);
> if (ret) {
> dev_err(dpi->dev, "Failed to enable pixel clock: %d\n", ret);
> @@ -462,10 +508,11 @@ static int mtk_dpi_power_on(struct mtk_dpi *dpi)
> if (dpi->pinctrl && dpi->pins_dpi)
> pinctrl_select_state(dpi->pinctrl, dpi->pins_dpi);
>
> - mtk_dpi_enable(dpi);
> return 0;
>
> err_pixel:
> + clk_disable_unprepare(dpi->dpi_ck_cg);
> +err_ck_cg:
> clk_disable_unprepare(dpi->engine_clk);
> err_refcount:
> dpi->refcount--;
> @@ -497,12 +544,21 @@ static int mtk_dpi_set_display_mode(struct mtk_dpi *dpi,
> pll_rate = clk_get_rate(dpi->tvd_clk);
>
> vm.pixelclock = pll_rate / factor;
> - if ((dpi->output_fmt == MEDIA_BUS_FMT_RGB888_2X12_LE) ||
> - (dpi->output_fmt == MEDIA_BUS_FMT_RGB888_2X12_BE))
> + if (dpi->conf->is_dpintf) {
> + if (factor == 1)
> + clk_set_parent(dpi->pixel_clk, dpi->pclk_src[2]);
> + else if (factor == 2)
> + clk_set_parent(dpi->pixel_clk, dpi->pclk_src[3]);
> + else if (factor == 4)
> + clk_set_parent(dpi->pixel_clk, dpi->pclk_src[4]);
> + else
> + clk_set_parent(dpi->pixel_clk, dpi->pclk_src[2]);
> + } else if ((dpi->output_fmt == MEDIA_BUS_FMT_RGB888_2X12_LE) ||
> + (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 +571,15 @@ 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;
> + }
I would propose the following, instead:
hsync.sync_width = vm.hsync_len;
hsync.back_porch = vm.hback_porch;
hsync.front_porch = vm.hfront_porch;
/*
* For DPINTF, we need to divide everything by 4 because of this,
* that and the other reason.
*/
if (dpi->conf->is_dpintf) {
hsync.sync_width /= 4;
hsync.back_porch /= 4;
hsync.front_porch /= 4;
}
> hsync.shift_half_line = false;
> vsync_lodd.sync_width = vm.vsync_len;
> vsync_lodd.back_porch = vm.vback_porch;
> @@ -559,13 +621,20 @@ 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);
> +
> return 0;
> }
>
> @@ -608,7 +677,6 @@ static u32 *mtk_dpi_bridge_atomic_get_input_bus_fmts(struct drm_bridge *bridge,
> u32 *input_fmts;
>
> *num_input_fmts = 0;
> -
Why are you removing this line? imo, it's fine to have it.
> input_fmts = kcalloc(1, sizeof(*input_fmts),
> GFP_KERNEL);
> if (!input_fmts)
> @@ -634,15 +702,18 @@ static int mtk_dpi_bridge_atomic_check(struct drm_bridge *bridge,
> if (dpi->conf->num_output_fmts)
> out_bus_format = dpi->conf->output_fmts[0];
>
> - dev_dbg(dpi->dev, "input format 0x%04x, output format 0x%04x\n",
> - bridge_state->input_bus_cfg.format,
> - bridge_state->output_bus_cfg.format);
> + dev_info(dpi->dev, "input format 0x%04x, output format 0x%04x\n",
> + bridge_state->input_bus_cfg.format,
> + bridge_state->output_bus_cfg.format);
This is definitely debugging information, and has to be kept as such.
>
> dpi->output_fmt = out_bus_format;
> 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;
> }
> @@ -687,7 +758,7 @@ mtk_dpi_bridge_mode_valid(struct drm_bridge *bridge,
> {
> struct mtk_dpi *dpi = bridge_to_dpi(bridge);
>
> - if (mode->clock > dpi->conf->max_clock_khz)
> + if (dpi->conf->max_clock_khz && mode->clock > dpi->conf->max_clock_khz)
> return MODE_CLOCK_HIGH;
>
> return MODE_OK;
> @@ -801,6 +872,16 @@ 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 +891,12 @@ 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 +904,13 @@ 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 +976,19 @@ 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;
> @@ -929,7 +1036,18 @@ static int mtk_dpi_probe(struct platform_device *pdev)
> if (IS_ERR(dpi->engine_clk)) {
> ret = PTR_ERR(dpi->engine_clk);
> if (ret != -EPROBE_DEFER)
> - dev_err(dev, "Failed to get engine clock: %d\n", ret);
> + dev_err(dev, "Failed to get engine clock: %d\n",
> + ret);
Why are you breaking this line? It fits! :)
> +
> + return ret;
> + }
> +
> + dpi->dpi_ck_cg = devm_clk_get_optional(dev, "ck_cg");
> + if (IS_ERR(dpi->dpi_ck_cg)) {
> + ret = PTR_ERR(dpi->dpi_ck_cg);
> + if (ret != -EPROBE_DEFER)
> + dev_err(dev, "Failed to get dpi ck cg clock: %d\n",
> + ret);
ditto
>
> return ret;
> }
> @@ -952,6 +1070,11 @@ static int mtk_dpi_probe(struct platform_device *pdev)
> return ret;
> }
>
> + dpi->pclk_src[1] = devm_clk_get(dev, "TVDPLL_D2");
> + dpi->pclk_src[2] = devm_clk_get(dev, "TVDPLL_D4");
> + dpi->pclk_src[3] = devm_clk_get(dev, "TVDPLL_D8");
> + dpi->pclk_src[4] = devm_clk_get(dev, "TVDPLL_D16");
if (dpi->conf->is_dpintf) {
dpi->pclk_src[1] = devm_clk_get(.....);
if (IS_ERR(dpi->pclk_src[1]))
return dpi->pclk_src[1];
dpi->pclk_src[2] = ..... (blahblah, etc)
}
or, you can also do (but I'm undecided on that)
if (dpi->conf->is_dpintf) {
for (........) {
dpi->pclk_src[...........
if (IS_ERR....)
return .....
}
}
It's your choice.... as long as you correctly error-check these calls.
Thanks,
Angelo
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