[PATCH 14/19] drm/sun4i: hdmi: Add support for A31's HDMI controller
Maxime Ripard
maxime.ripard at free-electrons.com
Fri Jun 2 12:41:10 PDT 2017
On Fri, Jun 02, 2017 at 06:10:19PM +0800, Chen-Yu Tsai wrote:
> 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 at csie.org>
> ---
> 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,
> +};
> +
Every thing here can be handled through regfield without having to
duplicate the logic.
> 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 |
What is this 0xff for?
Maxime
--
Maxime Ripard, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com
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