The HDMI controller found in the A31 SoCs is slightly different
from the one already supported, which is found in the A10s:
- Need different initial values for the PLL related registers
- Different behavior of the DDC and TMDS clocks
- Different register layout for the DDC portion
- Separate DDC parent clock
This patch adds support for it.
Signed-off-by: Chen-Yu Tsai <wens@xxxxxxxx>
---
drivers/gpu/drm/sun4i/sun4i_hdmi.h | 3 +
drivers/gpu/drm/sun4i/sun4i_hdmi_enc.c | 141 +++++++++++++++++++++++++++++++++
2 files changed, 144 insertions(+)
diff --git a/drivers/gpu/drm/sun4i/sun4i_hdmi.h b/drivers/gpu/drm/sun4i/sun4i_hdmi.h
index c63d0bd95963..2589bc92be59 100644
--- a/drivers/gpu/drm/sun4i/sun4i_hdmi.h
+++ b/drivers/gpu/drm/sun4i/sun4i_hdmi.h
@@ -56,10 +56,13 @@
#define SUN4I_HDMI_PAD_CTRL0_TXEN BIT(23)
#define SUN4I_HDMI_PAD_CTRL1_REG 0x204
+#define SUN4I_HDMI_PAD_CTRL1_UNKNOWN BIT(24) /* set on A31 */
#define SUN4I_HDMI_PAD_CTRL1_AMP_OPT BIT(23)
#define SUN4I_HDMI_PAD_CTRL1_AMPCK_OPT BIT(22)
#define SUN4I_HDMI_PAD_CTRL1_EMP_OPT BIT(20)
#define SUN4I_HDMI_PAD_CTRL1_EMPCK_OPT BIT(19)
+#define SUN4I_HDMI_PAD_CTRL1_PWSCK BIT(18)
+#define SUN4I_HDMI_PAD_CTRL1_PWSDT BIT(17)
#define SUN4I_HDMI_PAD_CTRL1_REG_DEN BIT(15)
#define SUN4I_HDMI_PAD_CTRL1_REG_DENCK BIT(14)
#define SUN4I_HDMI_PAD_CTRL1_REG_EMP(n) (((n) & 7) << 10)
diff --git a/drivers/gpu/drm/sun4i/sun4i_hdmi_enc.c b/drivers/gpu/drm/sun4i/sun4i_hdmi_enc.c
index 9ded40aaed32..e9abf93eb41c 100644
--- a/drivers/gpu/drm/sun4i/sun4i_hdmi_enc.c
+++ b/drivers/gpu/drm/sun4i/sun4i_hdmi_enc.c
@@ -293,6 +293,109 @@ static const struct drm_connector_helper_funcs sun4i_hdmi_connector_helper_funcs
.get_modes = sun4i_hdmi_get_modes,
};
+static int sun6i_hdmi_read_sub_block(struct sun4i_hdmi *hdmi,
+ unsigned int blk, unsigned int offset,
+ u8 *buf, unsigned int count)
+{
+ unsigned long reg;
+ int i;
+
+ reg = readl(hdmi->base + SUN6I_HDMI_DDC_FIFO_CTRL_REG);
+ writel(reg | SUN6I_HDMI_DDC_FIFO_CTRL_CLEAR,
+ hdmi->base + SUN6I_HDMI_DDC_FIFO_CTRL_REG);
+ writel(SUN6I_HDMI_DDC_ADDR_SEGMENT(offset >> 8) |
+ SUN6I_HDMI_DDC_ADDR_EDDC(DDC_SEGMENT_ADDR << 1) |
+ SUN6I_HDMI_DDC_ADDR_OFFSET(offset) |
+ SUN6I_HDMI_DDC_ADDR_SLAVE(DDC_ADDR),
+ hdmi->base + SUN6I_HDMI_DDC_ADDR_REG);
+
+ writel(SUN6I_HDMI_DDC_CMD_EXPLICIT_EDDC_READ |
+ SUN6I_HDMI_DDC_CMD_BYTE_COUNT(count),
+ hdmi->base + SUN6I_HDMI_DDC_CMD_REG);
+
+ reg = readl(hdmi->base + SUN6I_HDMI_DDC_CTRL_REG);
+ writel(reg | SUN6I_HDMI_DDC_CTRL_START_CMD,
+ hdmi->base + SUN6I_HDMI_DDC_CTRL_REG);
+
+ if (readl_poll_timeout(hdmi->base + SUN6I_HDMI_DDC_CTRL_REG, reg,
+ !(reg & SUN6I_HDMI_DDC_CTRL_START_CMD),
+ 100, 100000))
+ return -EIO;
+
+ for (i = 0; i < count; i++)
+ buf[i] = readb(hdmi->base + SUN6I_HDMI_DDC_FIFO_DATA_REG);
+
+ return 0;
+}
+
+static int sun6i_hdmi_read_edid_block(void *data, u8 *buf, unsigned int blk,
+ size_t length)
+{
+ struct sun4i_hdmi *hdmi = data;
+ int retry = 2, i;
+
+ do {
+ for (i = 0; i < length; i += SUN4I_HDMI_DDC_FIFO_SIZE) {
+ unsigned char offset = blk * EDID_LENGTH + i;
+ unsigned int count = min((unsigned int)SUN4I_HDMI_DDC_FIFO_SIZE,
+ length - i);
+ int ret;
+
+ ret = sun6i_hdmi_read_sub_block(hdmi, blk, offset,
+ buf + i, count);
+ if (ret)
+ return ret;
+ }
+ } while (!drm_edid_block_valid(buf, blk, true, NULL) && (retry--));
+
+ return 0;
+}
+
+static int sun6i_hdmi_get_modes(struct drm_connector *connector)
+{
+ struct sun4i_hdmi *hdmi = drm_connector_to_sun4i_hdmi(connector);
+ u32 reg;
+ struct edid *edid;
+ int ret;
+
+ clk_set_rate(hdmi->ddc_clk, 100000);
+ clk_prepare_enable(hdmi->ddc_clk);
+
+ /* Reset i2c controller */
+ writel(SUN6I_HDMI_DDC_CTRL_ENABLE | SUN6I_HDMI_DDC_CTRL_RESET |
+ SUN6I_HDMI_DDC_CTRL_SDA_ENABLE |
+ SUN6I_HDMI_DDC_CTRL_SCL_ENABLE,
+ hdmi->base + SUN6I_HDMI_DDC_CTRL_REG);
+ if (readl_poll_timeout(hdmi->base + SUN6I_HDMI_DDC_CTRL_REG, reg,
+ !(reg & SUN6I_HDMI_DDC_CTRL_RESET),
+ 100, 2000)) {
+ dev_err(hdmi->dev, "DDC reset timeout: %08x\n", reg);
+ clk_disable_unprepare(hdmi->ddc_clk);
+ return -EIO;
+ }
+
+ edid = drm_do_get_edid(connector, sun6i_hdmi_read_edid_block, hdmi);
+
+ clk_disable_unprepare(hdmi->ddc_clk);
+
+ if (!edid)
+ return 0;
+
+ hdmi->hdmi_monitor = drm_detect_hdmi_monitor(edid);
+ DRM_DEBUG_DRIVER("Monitor is %s monitor\n",
+ hdmi->hdmi_monitor ? "an HDMI" : "a DVI");
+
+ drm_mode_connector_update_edid_property(connector, edid);
+ ret = drm_add_edid_modes(connector, edid);
+ kfree(edid);
+
+ return ret;
+}
+
+static const struct drm_connector_helper_funcs sun6i_hdmi_connector_helper_funcs = {
+ .get_modes = sun6i_hdmi_get_modes,
+};
+
static enum drm_connector_status
sun4i_hdmi_connector_detect(struct drm_connector *connector, bool force)
{
@@ -367,6 +470,43 @@ static const struct sun4i_hdmi_variant sun5i_variant = {
SUN4I_HDMI_PLL_CTRL_PLL_EN,
};
+static const struct sun4i_hdmi_variant sun6i_variant = {
+ .connector_helpers = &sun6i_hdmi_connector_helper_funcs,
+ .ddc_create = sun6i_ddc_create,
+ .tmds_create = sun6i_tmds_create,
+ .has_ddc_parent_clk = true,
+ .has_reset_control = true,
+ .pad_ctrl0_init_val = 0xff |
+ SUN4I_HDMI_PAD_CTRL0_TXEN |
+ SUN4I_HDMI_PAD_CTRL0_CKEN |
+ SUN4I_HDMI_PAD_CTRL0_PWENG |
+ SUN4I_HDMI_PAD_CTRL0_PWEND |
+ SUN4I_HDMI_PAD_CTRL0_PWENC |
+ SUN4I_HDMI_PAD_CTRL0_LDODEN |
+ SUN4I_HDMI_PAD_CTRL0_LDOCEN,
+ .pad_ctrl1_init_val = SUN4I_HDMI_PAD_CTRL1_REG_AMP(6) |
+ SUN4I_HDMI_PAD_CTRL1_REG_EMP(4) |
+ SUN4I_HDMI_PAD_CTRL1_REG_DENCK |
+ SUN4I_HDMI_PAD_CTRL1_REG_DEN |
+ SUN4I_HDMI_PAD_CTRL1_EMPCK_OPT |
+ SUN4I_HDMI_PAD_CTRL1_EMP_OPT |
+ SUN4I_HDMI_PAD_CTRL1_PWSDT |
+ SUN4I_HDMI_PAD_CTRL1_PWSCK |
+ SUN4I_HDMI_PAD_CTRL1_AMPCK_OPT |
+ SUN4I_HDMI_PAD_CTRL1_AMP_OPT |
+ SUN4I_HDMI_PAD_CTRL1_UNKNOWN,
+ .pll_ctrl_init_val = SUN4I_HDMI_PLL_CTRL_VCO_S(8) |
+ SUN4I_HDMI_PLL_CTRL_CS(3) |
+ SUN4I_HDMI_PLL_CTRL_CP_S(10) |
+ SUN4I_HDMI_PLL_CTRL_S(4) |
+ SUN4I_HDMI_PLL_CTRL_VCO_GAIN(4) |
+ SUN4I_HDMI_PLL_CTRL_SDIV2 |
+ SUN4I_HDMI_PLL_CTRL_LDO2_EN |
+ SUN4I_HDMI_PLL_CTRL_LDO1_EN |
+ SUN4I_HDMI_PLL_CTRL_HV_IS_33 |
+ SUN4I_HDMI_PLL_CTRL_PLL_EN,
+};
+
static int sun4i_hdmi_bind(struct device *dev, struct device *master,
void *data)
{
@@ -559,6 +699,7 @@ static int sun4i_hdmi_remove(struct platform_device *pdev)
static const struct of_device_id sun4i_hdmi_of_table[] = {
{ .compatible = "allwinner,sun5i-a10s-hdmi", .data = &sun5i_variant, },
+ { .compatible = "allwinner,sun6i-a31-hdmi", .data = &sun6i_variant, },
{ }
};
MODULE_DEVICE_TABLE(of, sun4i_hdmi_of_table);
--
2.11.0
--
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