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Message-ID: <CAAOTY__u8R-WkTmnKkey5p7_fVuy2mgoRY4Fx_kqb5kb4hnqmQ@mail.gmail.com>
Date: Mon, 21 Feb 2022 09:46:15 +0800
From: Chun-Kuang Hu <chunkuang.hu@...nel.org>
To: Guillaume Ranquet <granquet@...libre.com>
Cc: Chun-Kuang Hu <chunkuang.hu@...nel.org>,
Philipp Zabel <p.zabel@...gutronix.de>,
David Airlie <airlied@...ux.ie>,
Daniel Vetter <daniel@...ll.ch>,
Rob Herring <robh+dt@...nel.org>,
Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
Maxime Ripard <mripard@...nel.org>,
Thomas Zimmermann <tzimmermann@...e.de>,
Matthias Brugger <matthias.bgg@...il.com>,
Chunfeng Yun <chunfeng.yun@...iatek.com>,
Kishon Vijay Abraham I <kishon@...com>,
Vinod Koul <vkoul@...nel.org>, deller@....de,
CK Hu <ck.hu@...iatek.com>, Jitao Shi <jitao.shi@...iatek.com>,
AngeloGioacchino Del Regno
<angelogioacchino.delregno@...labora.com>,
DRI Development <dri-devel@...ts.freedesktop.org>,
"moderated list:ARM/Mediatek SoC support"
<linux-mediatek@...ts.infradead.org>,
DTML <devicetree@...r.kernel.org>,
linux-kernel <linux-kernel@...r.kernel.org>,
Linux ARM <linux-arm-kernel@...ts.infradead.org>,
linux-phy@...ts.infradead.org, linux-fbdev@...r.kernel.org
Subject: Re: [PATCH v8 05/19] drm/mediatek: dpi: move dpi limits to board config
Hi, Guillaume:
Guillaume Ranquet <granquet@...libre.com> 於 2022年2月18日 週五 下午10:56寫道：
>
> Add flexibility by moving the dpi limits to the board config
This patch looks good to me. But I would like to know what's this
limit and why it vary in different SoC. If possible, would you please
provide more description for this?
Regards,
Chun-Kuang.
>
> Signed-off-by: Guillaume Ranquet <granquet@...libre.com>
> ---
> drivers/gpu/drm/mediatek/mtk_dpi.c | 25 ++++++++++++++++---------
> 1 file changed, 16 insertions(+), 9 deletions(-)
>
> diff --git a/drivers/gpu/drm/mediatek/mtk_dpi.c b/drivers/gpu/drm/mediatek/mtk_dpi.c
> index 4554e2de14309..4746eb3425674 100644
> --- a/drivers/gpu/drm/mediatek/mtk_dpi.c
> +++ b/drivers/gpu/drm/mediatek/mtk_dpi.c
> @@ -125,6 +125,7 @@ struct mtk_dpi_conf {
> bool edge_sel_en;
> const u32 *output_fmts;
> u32 num_output_fmts;
> + const struct mtk_dpi_yc_limit *limit;
> };
>
> static void mtk_dpi_mask(struct mtk_dpi *dpi, u32 offset, u32 val, u32 mask)
> @@ -235,9 +236,10 @@ static void mtk_dpi_config_fb_size(struct mtk_dpi *dpi, u32 width, u32 height)
> mtk_dpi_mask(dpi, DPI_SIZE, height << VSIZE, VSIZE_MASK);
> }
>
> -static void mtk_dpi_config_channel_limit(struct mtk_dpi *dpi,
> - struct mtk_dpi_yc_limit *limit)
> +static void mtk_dpi_config_channel_limit(struct mtk_dpi *dpi)
> {
> + const struct mtk_dpi_yc_limit *limit = dpi->conf->limit;
> +
> mtk_dpi_mask(dpi, DPI_Y_LIMIT, limit->y_bottom << Y_LIMINT_BOT,
> Y_LIMINT_BOT_MASK);
> mtk_dpi_mask(dpi, DPI_Y_LIMIT, limit->y_top << Y_LIMINT_TOP,
> @@ -449,7 +451,6 @@ static int mtk_dpi_power_on(struct mtk_dpi *dpi)
> static int mtk_dpi_set_display_mode(struct mtk_dpi *dpi,
> struct drm_display_mode *mode)
> {
> - struct mtk_dpi_yc_limit limit;
> struct mtk_dpi_polarities dpi_pol;
> struct mtk_dpi_sync_param hsync;
> struct mtk_dpi_sync_param vsync_lodd = { 0 };
> @@ -484,11 +485,6 @@ static int mtk_dpi_set_display_mode(struct mtk_dpi *dpi,
> dev_dbg(dpi->dev, "Got PLL %lu Hz, pixel clock %lu Hz\n",
> pll_rate, vm.pixelclock);
>
> - limit.c_bottom = 0x0010;
> - limit.c_top = 0x0FE0;
> - limit.y_bottom = 0x0010;
> - limit.y_top = 0x0FE0;
> -
> dpi_pol.ck_pol = MTK_DPI_POLARITY_FALLING;
> dpi_pol.de_pol = MTK_DPI_POLARITY_RISING;
> dpi_pol.hsync_pol = vm.flags & DISPLAY_FLAGS_HSYNC_HIGH ?
> @@ -536,7 +532,7 @@ static int mtk_dpi_set_display_mode(struct mtk_dpi *dpi,
> else
> mtk_dpi_config_fb_size(dpi, vm.hactive, vm.vactive);
>
> - mtk_dpi_config_channel_limit(dpi, &limit);
> + 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);
> @@ -790,12 +786,20 @@ static const u32 mt8183_output_fmts[] = {
> MEDIA_BUS_FMT_RGB888_2X12_BE,
> };
>
> +static const struct mtk_dpi_yc_limit mtk_dpi_limit = {
> + .c_bottom = 0x0010,
> + .c_top = 0x0FE0,
> + .y_bottom = 0x0010,
> + .y_top = 0x0FE0,
> +};
> +
> static const struct mtk_dpi_conf mt8173_conf = {
> .cal_factor = mt8173_calculate_factor,
> .reg_h_fre_con = 0xe0,
> .max_clock_khz = 300000,
> .output_fmts = mt8173_output_fmts,
> .num_output_fmts = ARRAY_SIZE(mt8173_output_fmts),
> + .limit = &mtk_dpi_limit,
> };
>
> static const struct mtk_dpi_conf mt2701_conf = {
> @@ -805,6 +809,7 @@ static const struct mtk_dpi_conf mt2701_conf = {
> .max_clock_khz = 150000,
> .output_fmts = mt8173_output_fmts,
> .num_output_fmts = ARRAY_SIZE(mt8173_output_fmts),
> + .limit = &mtk_dpi_limit,
> };
>
> static const struct mtk_dpi_conf mt8183_conf = {
> @@ -813,6 +818,7 @@ static const struct mtk_dpi_conf mt8183_conf = {
> .max_clock_khz = 100000,
> .output_fmts = mt8183_output_fmts,
> .num_output_fmts = ARRAY_SIZE(mt8183_output_fmts),
> + .limit = &mtk_dpi_limit,
> };
>
> static const struct mtk_dpi_conf mt8192_conf = {
> @@ -821,6 +827,7 @@ static const struct mtk_dpi_conf mt8192_conf = {
> .max_clock_khz = 150000,
> .output_fmts = mt8173_output_fmts,
> .num_output_fmts = ARRAY_SIZE(mt8173_output_fmts),
> + .limit = &mtk_dpi_limit,
> };
>
> static int mtk_dpi_probe(struct platform_device *pdev)
> --
> 2.34.1
>
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