On Tue, Nov 9, 2021 at 11:34 AM Tim Harvey <thar...@gateworks.com> wrote:
>
> Add nodes for MIPI DSI and LCDIF on IMX8MM
>
> I'm currently working with a set of patches to convert drm/exynos
> to a bridge [1] and add IMX8MM support [2] in order to get IMX8MM DSI
> working for display with a Raspberry Pi DSI touchscreen compatible with
> a Toshiba TC358762 DSI bridge and Powertip PH800480T013-IDF02
> touchscreen.
>
> I had this working on a 5.10 kernel with the old blk-ctl and
> power-domain drivers that didn't make it into mainline but my 5.15
> series with blk-ctl backported from next hangs right after
> "[drm] Initialized mxsfb-drm 1.0.0 20160824 for 32e00000.lcdif on minor 0"
> so I assume I have a power-domain not getting enabled.
>
> Please let me know if you see an issue with the way I've configured
> power-domain or clocks here.
>
> Best Regards,
>
> Tim
> [1]
> https://patchwork.kernel.org/project/dri-devel/list/?series=347439&archive=both&state=*
> [2]
> https://patchwork.kernel.org/project/linux-arm-kernel/list/?series=359775&archive=both&state=*
> ---
> arch/arm64/boot/dts/freescale/imx8mm.dtsi | 68 +++++++++++++++++++++++
> 1 file changed, 68 insertions(+)
>
> diff --git a/arch/arm64/boot/dts/freescale/imx8mm.dtsi
> b/arch/arm64/boot/dts/freescale/imx8mm.dtsi
> index 208a0ed840f4..195dcbff7058 100644
> --- a/arch/arm64/boot/dts/freescale/imx8mm.dtsi
> +++ b/arch/arm64/boot/dts/freescale/imx8mm.dtsi
> @@ -188,6 +188,12 @@
> clock-output-names = "clk_ext4";
> };
>
> + mipi_phy: mipi-video-phy {
> + compatible = "fsl,imx8mm-mipi-video-phy";
> + syscon = <&disp_blk_ctrl>;
> + #phy-cells = <1>;
> + };
> +
> psci {
> compatible = "arm,psci-1.0";
> method = "smc";
> @@ -1068,6 +1074,68 @@
> #size-cells = <1>;
> ranges = <0x32c00000 0x32c00000 0x400000>;
>
> + lcdif: lcdif@32e00000 {
> + #address-cells = <1>;
> + #size-cells = <0>;
> + compatible = "fsl,imx8mm-lcdif",
> "fsl,imx6sx-lcdif";
The compatible "imx6sx-lcdif" implies MXSFB_V6. FWICT, it is like
MXSFB_V4, but with overlays and those overlays have more registers
configured in the mxsfb_kms driver. Have you tried using imx28-lcdif
to see if it makes a difference?
> + reg = <0x32e00000 0x10000>;
> + clocks = <&clk IMX8MM_CLK_LCDIF_PIXEL>,
> + <&clk IMX8MM_CLK_DISP_AXI_ROOT>,
> + <&clk IMX8MM_CLK_DISP_APB_ROOT>;
> + clock-names = "pix", "disp_axi", "axi";
> + assigned-clocks = <&clk
> IMX8MM_CLK_LCDIF_PIXEL>,
> + <&clk IMX8MM_CLK_DISP_AXI>,
> + <&clk IMX8MM_CLK_DISP_APB>;
> + assigned-clock-parents = <&clk
> IMX8MM_VIDEO_PLL1_OUT>,
> + <&clk
> IMX8MM_SYS_PLL2_1000M>,
> + <&clk
> IMX8MM_SYS_PLL1_800M>;
> + assigned-clock-rate = <594000000>,
> <500000000>, <200000000>;
Just through visual inspection, it appears that the
IMX8MM_CLK_DISP_AXI and IMX8MM_CLK_DISP_APB clock-parents and rates
are already set in the pgc_dispmix, so I think it's safe to reduce
those lines to just assigning IMX8MM_CLK_LCDIF_PIXEL to the
IMX8MM_VIDEO_PLL1_OUT with the assigned-clock-rate set to 594000000.
adam
> + interrupts = <GIC_SPI 5 IRQ_TYPE_LEVEL_HIGH>;
> + power-domains = <&disp_blk_ctrl
> IMX8MM_DISPBLK_PD_LCDIF>;
> + status = "disabled";
> +
> + port@0 {
> + reg = <0>;
> +
> + lcdif_to_dsim: endpoint {
> + remote-endpoint =
> <&dsim_from_lcdif>;
> + };
> + };
> + };
> +
> + mipi_dsi: mipi_dsi@32e10000 {
> + #address-cells = <1>;
> + #size-cells = <0>;
> + compatible = "fsl,imx8mm-mipi-dsim";
> + reg = <0x32e10000 0x400>;
> + clocks = <&clk IMX8MM_CLK_DSI_CORE>,
> + <&clk IMX8MM_CLK_DSI_PHY_REF>;
> + clock-names = "bus_clk", "sclk_mipi";
> + assigned-clocks = <&clk IMX8MM_CLK_DSI_CORE>,
> + <&clk
> IMX8MM_VIDEO_PLL1_OUT>,
> + <&clk
> IMX8MM_CLK_DSI_PHY_REF>;
> + assigned-clock-parents = <&clk
> IMX8MM_SYS_PLL1_266M>,
> + <&clk
> IMX8MM_VIDEO_PLL1_BYPASS>,
> + <&clk
> IMX8MM_VIDEO_PLL1_OUT>;
> + assigned-clock-rates = <266000000>,
> <594000000>, <27000000>;
> + interrupts = <GIC_SPI 18 IRQ_TYPE_LEVEL_HIGH>;
> + phys = <&mipi_phy 0>;
> + phy-names = "dsim";
> + power-domains = <&disp_blk_ctrl
> IMX8MM_DISPBLK_PD_MIPI_DSI>;
> + samsung,burst-clock-frequency = <891000000>;
> + samsung,esc-clock-frequency = <54000000>;
> + samsung,pll-clock-frequency = <27000000>;
> + status = "disabled";
> +
> + port@0 {
> + reg = <0>;
> +
> + dsim_from_lcdif: endpoint {
> + remote-endpoint =
> <&lcdif_to_dsim>;
> + };
> + };
> + };
> +
> csi: csi@32e20000 {
> compatible = "fsl,imx8mm-csi", "fsl,imx7-csi";
> reg = <0x32e20000 0x1000>;
> --
> 2.17.1
>
