Hi Neil,
some high-level comments from me below.
On Fri, Jan 7, 2022 at 3:58 PM Neil Armstrong <narmstrong@xxxxxxxxxxxx> wrote:
[...]
> +/* MIPI DSI Relative REGISTERs Definitions */
> +/* For MIPI_DSI_TOP_CNTL */
> +#define BIT_DPI_COLOR_MODE 20
> +#define BIT_IN_COLOR_MODE 16
> +#define BIT_CHROMA_SUBSAMPLE 14
> +#define BIT_COMP2_SEL 12
> +#define BIT_COMP1_SEL 10
> +#define BIT_COMP0_SEL 8
> +#define BIT_DE_POL 6
> +#define BIT_HSYNC_POL 5
> +#define BIT_VSYNC_POL 4
> +#define BIT_DPICOLORM 3
> +#define BIT_DPISHUTDN 2
> +#define BIT_EDPITE_INTR_PULSE 1
> +#define BIT_ERR_INTR_PULSE 0
Why not use BIT() and GENMASK() for these and prefixing them with
MIPI_DSI_TOP_CNTL_?
That would make them consistent with other parts of the meson sub-driver.
[...]
> +static void meson_dw_mipi_dsi_hw_init(struct meson_dw_mipi_dsi *mipi_dsi)
> +{
> + writel_relaxed((1 << 4) | (1 << 5) | (0 << 6),
> + mipi_dsi->base + MIPI_DSI_TOP_CNTL);
please use the macros from above
> + writel_bits_relaxed(0xf, 0xf, mipi_dsi->base + MIPI_DSI_TOP_SW_RESET);
> + writel_bits_relaxed(0xf, 0, mipi_dsi->base + MIPI_DSI_TOP_SW_RESET);
[...]
> + phy_power_on(mipi_dsi->phy);
Please propagate the error code here.
Also shouldn't this go to a new dw_mipi_dsi_phy_power_on() as the PHY
driver uses the updated settings from phy_configure only in it's
.power_on callback?
[...]
> + phy_configure(mipi_dsi->phy, &mipi_dsi->phy_opts);
please propagate the error code here as the PHY driver has some
explicit code to return an error in it's .phy_configure callback
[...]
> + phy_init(mipi_dsi->phy);
please propagate the error code here
[...]
> + phy_exit(mipi_dsi->phy);
please propagate the error code here
[...]
> + res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> + mipi_dsi->base = devm_ioremap_resource(&pdev->dev, res);
other parts of the meson DRM driver have been converted to use
devm_platform_ioremap_resource()
I suggest updating this as well to simplify the code here
[...]
> + mipi_dsi->phy = devm_phy_get(&pdev->dev, "dphy");
> + if (IS_ERR(mipi_dsi->phy)) {
> + ret = PTR_ERR(mipi_dsi->phy);
> + dev_err(&pdev->dev, "failed to get mipi dphy: %d\n", ret);
> + return ret;
you can simplify this with:
return dev_err_probe(&pdev->dev, PTR_ERR(mipi_dsi->phy, "failed to
get mipi dphy\n");
[...]
> + mipi_dsi->px_clk = devm_clk_get(&pdev->dev, "px_clk");
> + if (IS_ERR(mipi_dsi->px_clk)) {
> + dev_err(&pdev->dev, "Unable to get PLL clk\n");
> + return PTR_ERR(mipi_dsi->px_clk);
you can simplify this with:
return dev_err_probe(&pdev->dev, PTR_ERR(mipi_dsi->px_clk, "Unable
to get PLL clk\n");
Also should it say s/PLL clk/px clock/?
[...]
> + top_rst = devm_reset_control_get_exclusive(&pdev->dev, "top");
> + if (IS_ERR(top_rst)) {
> + ret = PTR_ERR(top_rst);
> +
> + if (ret != -EPROBE_DEFER)
> + dev_err(&pdev->dev, "Unable to get reset control: %d\n", ret);
> +
> + return ret;
you can simplify this with:
return dev_err_probe(&pdev->dev, PTR_ERR(top_rst, "Unable to get
reset control\n");
[...]
> + mipi_dsi->dmd = dw_mipi_dsi_probe(pdev, &mipi_dsi->pdata);
> + if (IS_ERR(mipi_dsi->dmd)) {
> + ret = PTR_ERR(mipi_dsi->dmd);
> + if (ret != -EPROBE_DEFER)
> + dev_err(&pdev->dev,
> + "Failed to probe dw_mipi_dsi: %d\n", ret);
you can simplify this with:
dev_err_probe(&pdev->dev, ret, "Failed to probe dw_mipi_dsi\n");
Best regards,
Martin
