From: Jitao Shi <jitao.shi@mediatek.com>
To: Rob Herring <robh+dt@kernel.org>,
Mark Rutland <mark.rutland@arm.com>,
Matthias Brugger <matthias.bgg@gmail.com>,
Daniel Vetter <daniel@ffwll.ch>, David Airlie <airlied@linux.ie>,
<dri-devel@lists.freedesktop.org>, <linux-kernel@vger.kernel.org>
Cc: devicetree@vger.kernel.org, Jitao Shi <jitao.shi@mediatek.com>,
srv_heupstream@mediatek.com, huijuan.xie@mediatek.com,
stonea168@163.com, cawa.cheng@mediatek.com,
linux-mediatek@lists.infradead.org, bibby.hsieh@mediatek.com,
ck.hu@mediatek.com, yingjoe.chen@mediatek.com,
eddie.huang@mediatek.com, linux-arm-kernel@lists.infradead.org
Subject: [PATCH v13 5/6] drm/mediatek: dpi sample mode support
Date: Wed, 11 Mar 2020 15:18:22 +0800 [thread overview]
Message-ID: <20200311071823.117899-6-jitao.shi@mediatek.com> (raw)
In-Reply-To: <20200311071823.117899-1-jitao.shi@mediatek.com>
DPI can sample on falling, rising or both edge.
When DPI sample the data both rising and falling edge.
It can reduce half data io pins.
Reviewed-by: CK Hu <ck.hu@mediatek.com>
Signed-off-by: Jitao Shi <jitao.shi@mediatek.com>
---
drivers/gpu/drm/mediatek/mtk_dpi.c | 27 +++++++++++++++++++++++++--
1 file changed, 25 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/mediatek/mtk_dpi.c b/drivers/gpu/drm/mediatek/mtk_dpi.c
index 087f5ce732e1..2871e68e7767 100644
--- a/drivers/gpu/drm/mediatek/mtk_dpi.c
+++ b/drivers/gpu/drm/mediatek/mtk_dpi.c
@@ -75,6 +75,7 @@ struct mtk_dpi {
enum mtk_dpi_out_bit_num bit_num;
enum mtk_dpi_out_channel_swap channel_swap;
int refcount;
+ u32 pclk_sample;
};
static inline struct mtk_dpi *mtk_dpi_from_encoder(struct drm_encoder *e)
@@ -348,6 +349,13 @@ 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_enable_pclk_sample_dual_edge(struct mtk_dpi *dpi)
+{
+ mtk_dpi_mask(dpi, DPI_DDR_SETTING, DDR_EN | DDR_4PHASE,
+ DDR_EN | DDR_4PHASE);
+ mtk_dpi_mask(dpi, DPI_OUTPUT_SETTING, EDGE_SEL, EDGE_SEL);
+}
+
static void mtk_dpi_config_color_format(struct mtk_dpi *dpi,
enum mtk_dpi_out_color_format format)
{
@@ -439,7 +447,8 @@ static int mtk_dpi_set_display_mode(struct mtk_dpi *dpi,
pll_rate = clk_get_rate(dpi->tvd_clk);
vm.pixelclock = pll_rate / factor;
- clk_set_rate(dpi->pixel_clk, vm.pixelclock);
+ clk_set_rate(dpi->pixel_clk,
+ vm.pixelclock * (dpi->pclk_sample > 1 ? 2 : 1));
vm.pixelclock = clk_get_rate(dpi->pixel_clk);
dev_dbg(dpi->dev, "Got PLL %lu Hz, pixel clock %lu Hz\n",
@@ -450,7 +459,8 @@ static int mtk_dpi_set_display_mode(struct mtk_dpi *dpi,
limit.y_bottom = 0x0010;
limit.y_top = 0x0FE0;
- dpi_pol.ck_pol = MTK_DPI_POLARITY_FALLING;
+ dpi_pol.ck_pol = dpi->pclk_sample == 1 ?
+ MTK_DPI_POLARITY_RISING : MTK_DPI_POLARITY_FALLING;
dpi_pol.de_pol = MTK_DPI_POLARITY_RISING;
dpi_pol.hsync_pol = vm.flags & DISPLAY_FLAGS_HSYNC_HIGH ?
MTK_DPI_POLARITY_FALLING : MTK_DPI_POLARITY_RISING;
@@ -504,6 +514,8 @@ static int mtk_dpi_set_display_mode(struct mtk_dpi *dpi,
mtk_dpi_config_color_format(dpi, dpi->color_format);
mtk_dpi_config_2n_h_fre(dpi);
mtk_dpi_config_disable_edge(dpi);
+ if (dpi->pclk_sample > 1)
+ mtk_dpi_enable_pclk_sample_dual_edge(dpi);
mtk_dpi_sw_reset(dpi, false);
return 0;
@@ -693,6 +705,7 @@ static const struct mtk_dpi_conf mt8183_conf = {
static int mtk_dpi_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
+ struct device_node *ep;
struct mtk_dpi *dpi;
struct resource *mem;
int comp_id;
@@ -705,6 +718,16 @@ static int mtk_dpi_probe(struct platform_device *pdev)
dpi->dev = dev;
dpi->conf = (struct mtk_dpi_conf *)of_device_get_match_data(dev);
+ ep = of_graph_get_endpoint_by_regs(dev->of_node, 0, 0);
+ if (!ep) {
+ dev_err(dev, "Failed get the endpoint port\n");
+ return -EINVAL;
+ }
+
+ /* Get the sampling edge from the endpoint. */
+ of_property_read_u32(ep, "pclk-sample", &dpi->pclk_sample);
+ of_node_put(ep);
+
mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
dpi->regs = devm_ioremap_resource(dev, mem);
if (IS_ERR(dpi->regs)) {
--
2.21.0
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next prev parent reply other threads:[~2020-03-11 7:22 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-11 7:18 [PATCH v13 0/6] mt8183 dpi supports dual edge and pin mode swap Jitao Shi
2020-03-11 7:18 ` [PATCH v13 1/6] dt-bindings: media: add pclk-sample dual edge property Jitao Shi
2020-03-11 13:53 ` Neil Armstrong
2020-03-17 13:33 ` Chun-Kuang Hu
2020-03-11 7:18 ` [PATCH v13 2/6] dt-bindings: display: mediatek: control dpi pins mode to avoid leakage Jitao Shi
2020-03-19 18:29 ` Rob Herring
2020-03-11 7:18 ` [PATCH v13 3/6] dt-bindings: display: mediatek: dpi sample data in dual edge support Jitao Shi
2020-03-11 7:18 ` [PATCH v13 4/6] dt-bindings: display: mediatek: convert the document format from txt to yaml Jitao Shi
2020-03-19 18:33 ` Rob Herring
2020-03-11 7:18 ` Jitao Shi [this message]
2020-03-11 13:56 ` [PATCH v13 5/6] drm/mediatek: dpi sample mode support Neil Armstrong
2020-03-11 7:18 ` [PATCH v13 6/6] drm/mediatek: set dpi pin mode to gpio low to avoid leakage current Jitao Shi
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