On 2015å¹´07æ13æ¥ 14:00, Jianwei Wang wrote:
> This patch add support for Two Dimensional Animation and Compositing
> Engine (2D-ACE) on the Freescale SoCs.
>
> 2D-ACE is a Freescale display controller. 2D-ACE describes
> the functionality of the module extremely well its name is a value
> that cannot be used as a token in programming languages.
> Instead the valid token "DCU" is used to tag the register names and
> function names.
>
> The Display Controller Unit (DCU) module is a system master that
> fetches graphics stored in internal or external memory and displays
> them on a TFT LCD panel. A wide range of panel sizes is supported
> and the timing of the interface signals is highly configurable.
> Graphics are read directly from memory and then blended in real-time,
> which allows for dynamic content creation with minimal CPU
> intervention.
>
> The features:
> (1) Full RGB888 output to TFT LCD panel.
> (2) For the current LCD panel, WQVGA "480x272" is supported.
> (3) Blending of each pixel using up to 4 source layers
> dependent on size of panel.
> (4) Each graphic layer can be placed with one pixel resolution
> in either axis.
> (5) Each graphic layer support RGB565 and RGB888 direct colors
> without alpha
> channel and BGRA8888 BGRA4444 ARGB1555 direct colors with an
> alpha channel and YUV422 format.
> (6) Each graphic layer support alpha blending with 8-bit
> resolution.
>
> This is a simplified version, only one primary plane, one
> framebuffer, one crtc, one connector and one encoder for TFT LCD panel.
>
> Signed-off-by: Alison Wang <b18965 at freescale.com>
> Signed-off-by: Xiubo Li <lixiubo at cmss.chinamobile.com>
> Signed-off-by: Jianwei Wang <jianwei.wang at freescale.com>
> Acked-by: Daniel Vetter <daniel.vetter at ffwll.ch>
> Reviewed-by: Alison Wang <alison.wang at freescale.com>
> ---
>
>
> hanged in V8
> - Remove useless code
> #define DRIVER_NAME "fsl-dcu-drm"
> MODULE_ALIAS("platform:fsl-dcu-drm");
> Adviced by Paul Bolle
>
> Changed in V7
>
> - Remove redundant functions and replace deprecated hooker
> Adviced by Daniel Vetter
> - Replace drm_platform_init with drm_dev_alloc/register
> Adviced by Daniel Vetter
>
> Changed in V6
>
> - Add NEC nl4827hc19_05b panel to panel-simple.c
> Adviced by Mark Yao
> - Add DRIVER_ATOMIC for driver_features
> Adviced by Mark Yao
> - check fsl_dev if it's NULL at PM suspend/resume
> Adviced by Mark Yao
>
> Changed in V5
>
> - Update commit message
> - Add layer registers initialization
> - Remove unused functions
> - Rename driver folder
> Adviced by Stefan Agner
> - Move pixel clock control functions to fsl_dcu_drm_drv.c
> - remove redundant enable the clock implicitly using regmap
> Adviced by Stefan Agner
> - Add maintainer message
>
> Changed in V4:
>
> -This version doesn't have functionality changed
> Just a minor adjustment.
>
> Changed in V3:
>
> - Test driver on Vybrid board and add compatible string
> - Remove unused functions
> - set default crtc for encoder
> - replace legacy functions with atomic help functions
> Adviced by Daniel Vetter
> - Set the unique name of the DRM device
> - Implement irq handle function for vblank interrupt
>
> Changed in v2:
> - Add atomic support
> Adviced by Daniel Vetter
> - Modify bindings file
> - Rename node for compatibility
> - Move platform related code out for compatibility
> Adviced by Stefan Agner
>
[snip]
>
> +int fsl_dcu_drm_connector_create(struct fsl_dcu_drm_device *fsl_dev,
> + struct drm_encoder *encoder)
> +{
> + struct drm_connector *connector = &fsl_dev->connector.connector;
> + struct device_node *panel_node;
> + int ret;
> +
> + fsl_dev->connector.encoder = encoder;
> +
> + connector->display_info.width_mm = 0;
> + connector->display_info.height_mm = 0;
> +
> + ret = drm_connector_init(fsl_dev->ddev, connector,
> + &fsl_dcu_drm_connector_funcs,
> + DRM_MODE_CONNECTOR_LVDS);
> + if (ret < 0)
> + return ret;
> +
> + connector->dpms = DRM_MODE_DPMS_OFF;
> + drm_connector_helper_add(connector, &connector_helper_funcs);
> + ret = drm_connector_register(connector);
> + if (ret < 0)
> + goto err_cleanup;
> +
> + ret = drm_mode_connector_attach_encoder(connector, encoder);
> + if (ret < 0)
> + goto err_sysfs;
> +
> + connector->encoder = encoder;
> +
> + drm_object_property_set_value
> + (&connector->base, fsl_dev->ddev->mode_config.dpms_property,
> + DRM_MODE_DPMS_OFF);
> +
> + panel_node = of_parse_phandle(fsl_dev->np, "panel", 0);
> + if (panel_node) {
> + fsl_dev->connector.panel = of_drm_find_panel(panel_node);
> + if (!fsl_dev->connector.panel)
> + return -EPROBE_DEFER;
> + }
> +
I think cleanup is needed before return -EPROBE_DEFER, and put node
after use.
panel_node = of_parse_phandle(fsl_dev->np, "panel", 0);
if (panel_node) {
fsl_dev->connector.panel = of_drm_find_panel(panel_node);
if (!fsl_dev->connector.panel) {
of_node_put(panel_node);
ret = -EPROBE_DEFER;
goto err_sysfs;
}
}
of_node_put(panel_node);
> + ret = drm_panel_attach(fsl_dev->connector.panel, connector);
> + if (ret) {
> + dev_err(fsl_dev->dev, "failed to attach panel\n");
> + goto err_sysfs;
> + }
> +
> + return 0;
> +
> +err_sysfs:
> + drm_connector_unregister(connector);
> +err_cleanup:
> + drm_connector_cleanup(connector);
> + return ret;
> +}
[snip]
> +
> +static int fsl_dcu_bypass_tcon(struct fsl_dcu_drm_device *fsl_dev,
> + struct device_node *np)
> +{
> + struct device_node *tcon_np;
> + struct platform_device *pdev;
> + struct clk *tcon_clk;
> + struct resource *res;
> + void __iomem *base;
> +
> + tcon_np = of_parse_phandle(np, "tcon-controller", 0);
> + if (!tcon_np)
> + return -EINVAL;
> +
> + pdev = of_find_device_by_node(tcon_np);
> + if (!pdev)
> + return -EINVAL;
> +
> + tcon_clk = devm_clk_get(&pdev->dev, "tcon");
> + if (IS_ERR(tcon_clk))
> + return PTR_ERR(tcon_clk);
> + clk_prepare_enable(tcon_clk);
> +
clk_prepare_enable may fail, so please check the return value.
R ecommend that split clk_prepare_enable() to clk_prepare() and
clk_enable(),
use clk_prepare() only at clk first init, enable/disable by
clk_enable()/clk_disable().
> + res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> + if (!res)
> + return -ENODEV;
> +
> + base = devm_ioremap_resource(&pdev->dev, res);
> + if (IS_ERR(base))
> + return PTR_ERR(base);
> +
> + fsl_dev->tcon_regmap = devm_regmap_init_mmio(&pdev->dev,
> + base, &fsl_dcu_regmap_config);
> + if (IS_ERR(fsl_dev->tcon_regmap)) {
> + dev_err(&pdev->dev, "regmap init failed\n");
> + return PTR_ERR(fsl_dev->tcon_regmap);
> + }
> +
> + regmap_write(fsl_dev->tcon_regmap, TCON_CTRL1, TCON_BYPASS_ENABLE);
Hmm, regmap_write can fail, Is that OK not check the return value?
> + return 0;
> +}
> +
[snip]
> +static int fsl_dcu_drm_remove(struct platform_device *pdev)
> +{
> + struct fsl_dcu_drm_device *fsl_dev = platform_get_drvdata(pdev);
> +
> + drm_put_dev(fsl_dev->ddev);
> +
> + return 0;
> +}
> +
> +static const struct of_device_id fsl_dcu_of_match[] = {
> + { .compatible = "fsl,ls1021a-dcu", },
> + { .compatible = "fsl,vf610-dcu", },
> + { },
> +};
> +MODULE_DEVICE_TABLE(of, fsl_dcu_of_match);
> +
> +static struct platform_driver fsl_dcu_drm_platform_driver = {
> + .probe = fsl_dcu_drm_probe,
> + .remove = fsl_dcu_drm_remove,
> + .driver = {
> + .owner = THIS_MODULE,
remove ".owner = THIS_MODULE,"
platform_driver does not need to set an owner because
platform_driver_register() will set it.
--
ï¼ark
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