diff options
Diffstat (limited to 'drivers/gpu/drm/sun4i/sun4i_tcon.c')
| -rw-r--r-- | drivers/gpu/drm/sun4i/sun4i_tcon.c | 466 |
1 files changed, 362 insertions, 104 deletions
diff --git a/drivers/gpu/drm/sun4i/sun4i_tcon.c b/drivers/gpu/drm/sun4i/sun4i_tcon.c index d9791292553e..e122f5b2a395 100644 --- a/drivers/gpu/drm/sun4i/sun4i_tcon.c +++ b/drivers/gpu/drm/sun4i/sun4i_tcon.c @@ -14,9 +14,12 @@ #include <drm/drm_atomic_helper.h> #include <drm/drm_crtc.h> #include <drm/drm_crtc_helper.h> +#include <drm/drm_encoder.h> #include <drm/drm_modes.h> #include <drm/drm_of.h> +#include <uapi/drm/drm_mode.h> + #include <linux/component.h> #include <linux/ioport.h> #include <linux/of_address.h> @@ -32,66 +35,61 @@ #include "sun4i_tcon.h" #include "sunxi_engine.h" -void sun4i_tcon_disable(struct sun4i_tcon *tcon) -{ - DRM_DEBUG_DRIVER("Disabling TCON\n"); - - /* Disable the TCON */ - regmap_update_bits(tcon->regs, SUN4I_TCON_GCTL_REG, - SUN4I_TCON_GCTL_TCON_ENABLE, 0); -} -EXPORT_SYMBOL(sun4i_tcon_disable); - -void sun4i_tcon_enable(struct sun4i_tcon *tcon) +static void sun4i_tcon_channel_set_status(struct sun4i_tcon *tcon, int channel, + bool enabled) { - DRM_DEBUG_DRIVER("Enabling TCON\n"); - - /* Enable the TCON */ - regmap_update_bits(tcon->regs, SUN4I_TCON_GCTL_REG, - SUN4I_TCON_GCTL_TCON_ENABLE, - SUN4I_TCON_GCTL_TCON_ENABLE); -} -EXPORT_SYMBOL(sun4i_tcon_enable); + struct clk *clk; -void sun4i_tcon_channel_disable(struct sun4i_tcon *tcon, int channel) -{ - DRM_DEBUG_DRIVER("Disabling TCON channel %d\n", channel); - - /* Disable the TCON's channel */ - if (channel == 0) { + switch (channel) { + case 0: regmap_update_bits(tcon->regs, SUN4I_TCON0_CTL_REG, - SUN4I_TCON0_CTL_TCON_ENABLE, 0); - clk_disable_unprepare(tcon->dclk); + SUN4I_TCON0_CTL_TCON_ENABLE, + enabled ? SUN4I_TCON0_CTL_TCON_ENABLE : 0); + clk = tcon->dclk; + break; + case 1: + WARN_ON(!tcon->quirks->has_channel_1); + regmap_update_bits(tcon->regs, SUN4I_TCON1_CTL_REG, + SUN4I_TCON1_CTL_TCON_ENABLE, + enabled ? SUN4I_TCON1_CTL_TCON_ENABLE : 0); + clk = tcon->sclk1; + break; + default: + DRM_WARN("Unknown channel... doing nothing\n"); return; } - WARN_ON(!tcon->quirks->has_channel_1); - regmap_update_bits(tcon->regs, SUN4I_TCON1_CTL_REG, - SUN4I_TCON1_CTL_TCON_ENABLE, 0); - clk_disable_unprepare(tcon->sclk1); + if (enabled) + clk_prepare_enable(clk); + else + clk_disable_unprepare(clk); } -EXPORT_SYMBOL(sun4i_tcon_channel_disable); -void sun4i_tcon_channel_enable(struct sun4i_tcon *tcon, int channel) +void sun4i_tcon_set_status(struct sun4i_tcon *tcon, + const struct drm_encoder *encoder, + bool enabled) { - DRM_DEBUG_DRIVER("Enabling TCON channel %d\n", channel); - - /* Enable the TCON's channel */ - if (channel == 0) { - regmap_update_bits(tcon->regs, SUN4I_TCON0_CTL_REG, - SUN4I_TCON0_CTL_TCON_ENABLE, - SUN4I_TCON0_CTL_TCON_ENABLE); - clk_prepare_enable(tcon->dclk); + int channel; + + switch (encoder->encoder_type) { + case DRM_MODE_ENCODER_NONE: + channel = 0; + break; + case DRM_MODE_ENCODER_TMDS: + case DRM_MODE_ENCODER_TVDAC: + channel = 1; + break; + default: + DRM_DEBUG_DRIVER("Unknown encoder type, doing nothing...\n"); return; } - WARN_ON(!tcon->quirks->has_channel_1); - regmap_update_bits(tcon->regs, SUN4I_TCON1_CTL_REG, - SUN4I_TCON1_CTL_TCON_ENABLE, - SUN4I_TCON1_CTL_TCON_ENABLE); - clk_prepare_enable(tcon->sclk1); + regmap_update_bits(tcon->regs, SUN4I_TCON_GCTL_REG, + SUN4I_TCON_GCTL_TCON_ENABLE, + enabled ? SUN4I_TCON_GCTL_TCON_ENABLE : 0); + + sun4i_tcon_channel_set_status(tcon, channel, enabled); } -EXPORT_SYMBOL(sun4i_tcon_channel_enable); void sun4i_tcon_enable_vblank(struct sun4i_tcon *tcon, bool enable) { @@ -109,30 +107,40 @@ void sun4i_tcon_enable_vblank(struct sun4i_tcon *tcon, bool enable) } EXPORT_SYMBOL(sun4i_tcon_enable_vblank); -void sun4i_tcon_set_mux(struct sun4i_tcon *tcon, int channel, - struct drm_encoder *encoder) +/* + * This function is a helper for TCON output muxing. The TCON output + * muxing control register in earlier SoCs (without the TCON TOP block) + * are located in TCON0. This helper returns a pointer to TCON0's + * sun4i_tcon structure, or NULL if not found. + */ +static struct sun4i_tcon *sun4i_get_tcon0(struct drm_device *drm) { - u32 val; + struct sun4i_drv *drv = drm->dev_private; + struct sun4i_tcon *tcon; - if (!tcon->quirks->has_unknown_mux) - return; + list_for_each_entry(tcon, &drv->tcon_list, list) + if (tcon->id == 0) + return tcon; - if (channel != 1) - return; + dev_warn(drm->dev, + "TCON0 not found, display output muxing may not work\n"); - if (encoder->encoder_type == DRM_MODE_ENCODER_TVDAC) - val = 1; - else - val = 0; + return NULL; +} - /* - * FIXME: Undocumented bits - */ - regmap_write(tcon->regs, SUN4I_TCON_MUX_CTRL_REG, val); +void sun4i_tcon_set_mux(struct sun4i_tcon *tcon, int channel, + const struct drm_encoder *encoder) +{ + int ret = -ENOTSUPP; + + if (tcon->quirks->set_mux) + ret = tcon->quirks->set_mux(tcon, encoder); + + DRM_DEBUG_DRIVER("Muxing encoder %s to CRTC %s: %d\n", + encoder->name, encoder->crtc->name, ret); } -EXPORT_SYMBOL(sun4i_tcon_set_mux); -static int sun4i_tcon_get_clk_delay(struct drm_display_mode *mode, +static int sun4i_tcon_get_clk_delay(const struct drm_display_mode *mode, int channel) { int delay = mode->vtotal - mode->vdisplay; @@ -150,15 +158,26 @@ static int sun4i_tcon_get_clk_delay(struct drm_display_mode *mode, return delay; } -void sun4i_tcon0_mode_set(struct sun4i_tcon *tcon, - struct drm_display_mode *mode) +static void sun4i_tcon0_mode_set_common(struct sun4i_tcon *tcon, + const struct drm_display_mode *mode) +{ + /* Configure the dot clock */ + clk_set_rate(tcon->dclk, mode->crtc_clock * 1000); + + /* Set the resolution */ + regmap_write(tcon->regs, SUN4I_TCON0_BASIC0_REG, + SUN4I_TCON0_BASIC0_X(mode->crtc_hdisplay) | + SUN4I_TCON0_BASIC0_Y(mode->crtc_vdisplay)); +} + +static void sun4i_tcon0_mode_set_rgb(struct sun4i_tcon *tcon, + const struct drm_display_mode *mode) { unsigned int bp, hsync, vsync; u8 clk_delay; u32 val = 0; - /* Configure the dot clock */ - clk_set_rate(tcon->dclk, mode->crtc_clock * 1000); + sun4i_tcon0_mode_set_common(tcon, mode); /* Adjust clock delay */ clk_delay = sun4i_tcon_get_clk_delay(mode, 0); @@ -166,11 +185,6 @@ void sun4i_tcon0_mode_set(struct sun4i_tcon *tcon, SUN4I_TCON0_CTL_CLK_DELAY_MASK, SUN4I_TCON0_CTL_CLK_DELAY(clk_delay)); - /* Set the resolution */ - regmap_write(tcon->regs, SUN4I_TCON0_BASIC0_REG, - SUN4I_TCON0_BASIC0_X(mode->crtc_hdisplay) | - SUN4I_TCON0_BASIC0_Y(mode->crtc_vdisplay)); - /* * This is called a backporch in the register documentation, * but it really is the back porch + hsync @@ -224,10 +238,9 @@ void sun4i_tcon0_mode_set(struct sun4i_tcon *tcon, /* Enable the output on the pins */ regmap_write(tcon->regs, SUN4I_TCON0_IO_TRI_REG, 0); } -EXPORT_SYMBOL(sun4i_tcon0_mode_set); -void sun4i_tcon1_mode_set(struct sun4i_tcon *tcon, - struct drm_display_mode *mode) +static void sun4i_tcon1_mode_set(struct sun4i_tcon *tcon, + const struct drm_display_mode *mode) { unsigned int bp, hsync, vsync, vtotal; u8 clk_delay; @@ -315,7 +328,26 @@ void sun4i_tcon1_mode_set(struct sun4i_tcon *tcon, SUN4I_TCON_GCTL_IOMAP_MASK, SUN4I_TCON_GCTL_IOMAP_TCON1); } -EXPORT_SYMBOL(sun4i_tcon1_mode_set); + +void sun4i_tcon_mode_set(struct sun4i_tcon *tcon, + const struct drm_encoder *encoder, + const struct drm_display_mode *mode) +{ + switch (encoder->encoder_type) { + case DRM_MODE_ENCODER_NONE: + sun4i_tcon0_mode_set_rgb(tcon, mode); + sun4i_tcon_set_mux(tcon, 0, encoder); + break; + case DRM_MODE_ENCODER_TVDAC: + case DRM_MODE_ENCODER_TMDS: + sun4i_tcon1_mode_set(tcon, mode); + sun4i_tcon_set_mux(tcon, 1, encoder); + break; + default: + DRM_DEBUG_DRIVER("Unknown encoder type, doing nothing...\n"); + } +} +EXPORT_SYMBOL(sun4i_tcon_mode_set); static void sun4i_tcon_finish_page_flip(struct drm_device *dev, struct sun4i_crtc *scrtc) @@ -463,42 +495,170 @@ static int sun4i_tcon_init_regmap(struct device *dev, * function in fact searches the corresponding engine, and the ID is * requested via the get_id function of the engine. */ -static struct sunxi_engine *sun4i_tcon_find_engine(struct sun4i_drv *drv, - struct device_node *node) +static struct sunxi_engine * +sun4i_tcon_find_engine_traverse(struct sun4i_drv *drv, + struct device_node *node) { struct device_node *port, *ep, *remote; - struct sunxi_engine *engine; + struct sunxi_engine *engine = ERR_PTR(-EINVAL); port = of_graph_get_port_by_id(node, 0); if (!port) return ERR_PTR(-EINVAL); + /* + * This only works if there is only one path from the TCON + * to any display engine. Otherwise the probe order of the + * TCONs and display engines is not guaranteed. They may + * either bind to the wrong one, or worse, bind to the same + * one if additional checks are not done. + * + * Bail out if there are multiple input connections. + */ + if (of_get_available_child_count(port) != 1) + goto out_put_port; + + /* Get the first connection without specifying an ID */ + ep = of_get_next_available_child(port, NULL); + if (!ep) + goto out_put_port; + + remote = of_graph_get_remote_port_parent(ep); + if (!remote) + goto out_put_ep; + + /* does this node match any registered engines? */ + list_for_each_entry(engine, &drv->engine_list, list) + if (remote == engine->node) + goto out_put_remote; + + /* keep looking through upstream ports */ + engine = sun4i_tcon_find_engine_traverse(drv, remote); + +out_put_remote: + of_node_put(remote); +out_put_ep: + of_node_put(ep); +out_put_port: + of_node_put(port); + + return engine; +} + +/* + * The device tree binding says that the remote endpoint ID of any + * connection between components, up to and including the TCON, of + * the display pipeline should be equal to the actual ID of the local + * component. Thus we can look at any one of the input connections of + * the TCONs, and use that connection's remote endpoint ID as our own. + * + * Since the user of this function already finds the input port, + * the port is passed in directly without further checks. + */ +static int sun4i_tcon_of_get_id_from_port(struct device_node *port) +{ + struct device_node *ep; + int ret = -EINVAL; + + /* try finding an upstream endpoint */ for_each_available_child_of_node(port, ep) { - remote = of_graph_get_remote_port_parent(ep); + struct device_node *remote; + u32 reg; + + remote = of_graph_get_remote_endpoint(ep); if (!remote) continue; - /* does this node match any registered engines? */ - list_for_each_entry(engine, &drv->engine_list, list) { - if (remote == engine->node) { - of_node_put(remote); - of_node_put(port); - return engine; - } - } + ret = of_property_read_u32(remote, "reg", ®); + if (ret) + continue; - /* keep looking through upstream ports */ - engine = sun4i_tcon_find_engine(drv, remote); - if (!IS_ERR(engine)) { - of_node_put(remote); - of_node_put(port); - return engine; - } + ret = reg; } + return ret; +} + +/* + * Once we know the TCON's id, we can look through the list of + * engines to find a matching one. We assume all engines have + * been probed and added to the list. + */ +static struct sunxi_engine *sun4i_tcon_get_engine_by_id(struct sun4i_drv *drv, + int id) +{ + struct sunxi_engine *engine; + + list_for_each_entry(engine, &drv->engine_list, list) + if (engine->id == id) + return engine; + return ERR_PTR(-EINVAL); } +/* + * On SoCs with the old display pipeline design (Display Engine 1.0), + * we assumed the TCON was always tied to just one backend. However + * this proved not to be the case. On the A31, the TCON can select + * either backend as its source. On the A20 (and likely on the A10), + * the backend can choose which TCON to output to. + * + * The device tree binding says that the remote endpoint ID of any + * connection between components, up to and including the TCON, of + * the display pipeline should be equal to the actual ID of the local + * component. Thus we should be able to look at any one of the input + * connections of the TCONs, and use that connection's remote endpoint + * ID as our own. + * + * However the connections between the backend and TCON were assumed + * to be always singular, and their endpoit IDs were all incorrectly + * set to 0. This means for these old device trees, we cannot just look + * up the remote endpoint ID of a TCON input endpoint. TCON1 would be + * incorrectly identified as TCON0. + * + * This function first checks if the TCON node has 2 input endpoints. + * If so, then the device tree is a corrected version, and it will use + * sun4i_tcon_of_get_id() and sun4i_tcon_get_engine_by_id() from above + * to fetch the ID and engine directly. If not, then it is likely an + * old device trees, where the endpoint IDs were incorrect, but did not + * have endpoint connections between the backend and TCON across + * different display pipelines. It will fall back to the old method of + * traversing the of_graph to try and find a matching engine by device + * node. + * + * In the case of single display pipeline device trees, either method + * works. + */ +static struct sunxi_engine *sun4i_tcon_find_engine(struct sun4i_drv *drv, + struct device_node *node) +{ + struct device_node *port; + struct sunxi_engine *engine; + + port = of_graph_get_port_by_id(node, 0); + if (!port) + return ERR_PTR(-EINVAL); + + /* + * Is this a corrected device tree with cross pipeline + * connections between the backend and TCON? + */ + if (of_get_child_count(port) > 1) { + /* Get our ID directly from an upstream endpoint */ + int id = sun4i_tcon_of_get_id_from_port(port); + + /* Get our engine by matching our ID */ + engine = sun4i_tcon_get_engine_by_id(drv, id); + + of_node_put(port); + return engine; + } + + /* Fallback to old method by traversing input endpoints */ + of_node_put(port); + return sun4i_tcon_find_engine_traverse(drv, node); +} + static int sun4i_tcon_bind(struct device *dev, struct device *master, void *data) { @@ -530,10 +690,7 @@ static int sun4i_tcon_bind(struct device *dev, struct device *master, } /* Make sure our TCON is reset */ - if (!reset_control_status(tcon->lcd_rst)) - reset_control_assert(tcon->lcd_rst); - - ret = reset_control_deassert(tcon->lcd_rst); + ret = reset_control_reset(tcon->lcd_rst); if (ret) { dev_err(dev, "Couldn't deassert our reset line\n"); return ret; @@ -574,6 +731,25 @@ static int sun4i_tcon_bind(struct device *dev, struct device *master, if (ret < 0) goto err_free_clocks; + if (tcon->quirks->needs_de_be_mux) { + /* + * We assume there is no dynamic muxing of backends + * and TCONs, so we select the backend with same ID. + * + * While dynamic selection might be interesting, since + * the CRTC is tied to the TCON, while the layers are + * tied to the backends, this means, we will need to + * switch between groups of layers. There might not be + * a way to represent this constraint in DRM. + */ + regmap_update_bits(tcon->regs, SUN4I_TCON0_CTL_REG, + SUN4I_TCON0_CTL_SRC_SEL_MASK, + tcon->id); + regmap_update_bits(tcon->regs, SUN4I_TCON1_CTL_REG, + SUN4I_TCON1_CTL_SRC_SEL_MASK, + tcon->id); + } + list_add_tail(&tcon->list, &drv->tcon_list); return 0; @@ -623,17 +799,97 @@ static int sun4i_tcon_remove(struct platform_device *pdev) return 0; } +/* platform specific TCON muxing callbacks */ +static int sun4i_a10_tcon_set_mux(struct sun4i_tcon *tcon, + const struct drm_encoder *encoder) +{ + struct sun4i_tcon *tcon0 = sun4i_get_tcon0(encoder->dev); + u32 shift; + + if (!tcon0) + return -EINVAL; + + switch (encoder->encoder_type) { + case DRM_MODE_ENCODER_TMDS: + /* HDMI */ + shift = 8; + break; + default: + return -EINVAL; + } + + regmap_update_bits(tcon0->regs, SUN4I_TCON_MUX_CTRL_REG, + 0x3 << shift, tcon->id << shift); + + return 0; +} + +static int sun5i_a13_tcon_set_mux(struct sun4i_tcon *tcon, + const struct drm_encoder *encoder) +{ + u32 val; + + if (encoder->encoder_type == DRM_MODE_ENCODER_TVDAC) + val = 1; + else + val = 0; + + /* + * FIXME: Undocumented bits + */ + return regmap_write(tcon->regs, SUN4I_TCON_MUX_CTRL_REG, val); +} + +static int sun6i_tcon_set_mux(struct sun4i_tcon *tcon, + const struct drm_encoder *encoder) +{ + struct sun4i_tcon *tcon0 = sun4i_get_tcon0(encoder->dev); + u32 shift; + + if (!tcon0) + return -EINVAL; + + switch (encoder->encoder_type) { + case DRM_MODE_ENCODER_TMDS: + /* HDMI */ + shift = 8; + break; + default: + /* TODO A31 has MIPI DSI but A31s does not */ + return -EINVAL; + } + + regmap_update_bits(tcon0->regs, SUN4I_TCON_MUX_CTRL_REG, + 0x3 << shift, tcon->id << shift); + + return 0; +} + +static const struct sun4i_tcon_quirks sun4i_a10_quirks = { + .has_channel_1 = true, + .set_mux = sun4i_a10_tcon_set_mux, +}; + static const struct sun4i_tcon_quirks sun5i_a13_quirks = { - .has_unknown_mux = true, - .has_channel_1 = true, + .has_channel_1 = true, + .set_mux = sun5i_a13_tcon_set_mux, }; static const struct sun4i_tcon_quirks sun6i_a31_quirks = { - .has_channel_1 = true, + .has_channel_1 = true, + .needs_de_be_mux = true, + .set_mux = sun6i_tcon_set_mux, }; static const struct sun4i_tcon_quirks sun6i_a31s_quirks = { - .has_channel_1 = true, + .has_channel_1 = true, + .needs_de_be_mux = true, +}; + +static const struct sun4i_tcon_quirks sun7i_a20_quirks = { + .has_channel_1 = true, + /* Same display pipeline structure as A10 */ + .set_mux = sun4i_a10_tcon_set_mux, }; static const struct sun4i_tcon_quirks sun8i_a33_quirks = { @@ -645,9 +901,11 @@ static const struct sun4i_tcon_quirks sun8i_v3s_quirks = { }; static const struct of_device_id sun4i_tcon_of_table[] = { + { .compatible = "allwinner,sun4i-a10-tcon", .data = &sun4i_a10_quirks }, { .compatible = "allwinner,sun5i-a13-tcon", .data = &sun5i_a13_quirks }, { .compatible = "allwinner,sun6i-a31-tcon", .data = &sun6i_a31_quirks }, { .compatible = "allwinner,sun6i-a31s-tcon", .data = &sun6i_a31s_quirks }, + { .compatible = "allwinner,sun7i-a20-tcon", .data = &sun7i_a20_quirks }, { .compatible = "allwinner,sun8i-a33-tcon", .data = &sun8i_a33_quirks }, { .compatible = "allwinner,sun8i-v3s-tcon", .data = &sun8i_v3s_quirks }, { } |