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AM335x How to probe da8xx-fb driver?

hoseok kim
Prodigy 40 points

Other Parts Discussed in Thread: DA8XX, TLC59108

I tried to probe da8xx-fb driver. ( Linux version is 4.4.12 )

I've changed defconfig file as below.

/arm/configs/am335x-evm_defconfig

# CONFIG_FB_IBM_GXT4500 is not set
-# CONFIG_FB_DA8XX is not set
+CONFIG_FB_DA8XX=y
# CONFIG_FB_VIRTUAL is not set
# CONFIG_FB_METRONOME is not set
# CONFIG_FB_MB862XX is not set
# CONFIG_FB_BROADSHEET is not set
# CONFIG_FB_AUO_K190X is not set
-CONFIG_FB_SIMPLE=y
+# CONFIG_FB_SIMPLE is not set

After compiling kernel driver source files, da8xx-fb.o was found in /drivers/video/fbdev/.

While running system, I can't find any log messages related with da8xx-fb. ( LCD not work )

[ 1.109012] of_graph_get_next_endpoint(): no port node found in /ocp/lcdc@4830e000
[ 1.117257] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
[ 1.123993] [drm] No driver support for vblank timestamp query.
[ 1.146032] Console: switching to colour frame buffer device 100x30
[ 1.160635] tilcdc 4830e000.lcdc: fb0: frame buffer device
[ 1.191715] [drm] Initialized tilcdc 1.0.0 20121205 on minor 0
[ 1.207478] loop: module loaded
[ 1.214299] libphy: Fixed MDIO Bus: probed
[ 1.281726] davinci_mdio 4a101000.mdio: davinci mdio revision 1.6
[ 1.287901] davinci_mdio 4a101000.mdio: no live phy, scanning all
[ 1.294372] davinci_mdio: probe of 4a101000.mdio failed with error -5
[ 1.315664] cpsw 4a100000.ethernet: Detected MACID = 68:c9:0b:af:6e:14

fb_probe() is not called in da8xx-fb.c

Please let me know how to probe da8xx-fb.c

  • 0
    TI__Guru**** 393215 points
    I will forward this to the software team. They will respond here.
  • 0
    TI__Guru**** 161600 points
    Hi,

    You're trying to get the fbdev driver working, without the drm driver, right?

    In that case, you need to:
    - enable:
    CONFIG_FB_DA8XX=y
    CONFIG_FB_DA8XX_TDA998X=y
    - disable:
    CONFIG_DRM
    CONFIG_DRM_I2C_NXP_TDA998X
    CONFIG_DRM_TILCDC
    because DRM & fbdev cannot coexist.

    Also you need to reconfigure your device tree node, you could take reference from this guide (for older TI SDK):
    processors.wiki.ti.com/.../Sitara_Linux_LCDC_Porting_Guide
    and adapt to your kernel 4.4.

    The following wiki links may also be of use:
    processors.wiki.ti.com/.../Processor_SDK_Linux_LCDC

    Best Regards,
    Yordan
  • 0 in reply to Yordan Kovachev
    Prodigy 40 points
    Dear Yordan.
    Thanks for your reply.
    I modified config you suggested.

    @@ -3156,7 +3156,7 @@ CONFIG_DVB_TUNER_DIB0090=m
    CONFIG_VGA_ARB=y
    CONFIG_VGA_ARB_MAX_GPUS=16
    # CONFIG_IMX_IPUV3_CORE is not set
    -CONFIG_DRM=y
    +# CONFIG_DRM is not set
    CONFIG_DRM_MIPI_DSI=y
    CONFIG_DRM_KMS_HELPER=y
    CONFIG_DRM_KMS_FB_HELPER=y
    @@ -3172,7 +3172,7 @@ CONFIG_DRM_KMS_CMA_HELPER=y
    CONFIG_DRM_I2C_ADV7511=m
    # CONFIG_DRM_I2C_CH7006 is not set
    # CONFIG_DRM_I2C_SIL164 is not set
    -CONFIG_DRM_I2C_NXP_TDA998X=y
    +# CONFIG_DRM_I2C_NXP_TDA998X is not set
    # CONFIG_DRM_TDFX is not set
    # CONFIG_DRM_R128 is not set
    # CONFIG_DRM_RADEON is not set
    @@ -3254,29 +3254,29 @@ CONFIG_DISPLAY_PANEL_DPI=y
    # CONFIG_DISPLAY_PANEL_TPO_TD043MTEA1 is not set
    # CONFIG_DISPLAY_PANEL_NEC_NL8048HL11 is not set
    CONFIG_DISPLAY_PANEL_TLC59108=y
    -CONFIG_DRM_TILCDC=y
    -CONFIG_DRM_TILCDC_SLAVE_COMPAT=y
    +# CONFIG_DRM_TILCDC is not set
    +# CONFIG_DRM_TILCDC_SLAVE_COMPAT is not set
    # CONFIG_DRM_QXL is not set
    # CONFIG_DRM_BOCHS is not set
    # CONFIG_DRM_VIRTIO_GPU is not set
    # CONFIG_DRM_FSL_DCU is not set
    -CONFIG_DRM_PANEL=y
    +# CONFIG_DRM_PANEL is not set

    #
    # Display Panels
    #
    -CONFIG_DRM_PANEL_SIMPLE=y
    +# CONFIG_DRM_PANEL_SIMPLE is not set
    # CONFIG_DRM_PANEL_SAMSUNG_LD9040 is not set
    # CONFIG_DRM_PANEL_LG_LG4573 is not set
    -CONFIG_DRM_PANEL_SAMSUNG_S6E8AA0=m
    +# CONFIG_DRM_PANEL_SAMSUNG_S6E8AA0 is not set
    # CONFIG_DRM_PANEL_SHARP_LQ101R1SX01 is not set
    -CONFIG_DRM_BRIDGE=y
    +# CONFIG_DRM_BRIDGE is not set

    #
    # Display Interface Bridges
    #
    -CONFIG_DRM_NXP_PTN3460=m
    -CONFIG_DRM_PARADE_PS8622=m
    +# CONFIG_DRM_NXP_PTN3460=m
    +# CONFIG_DRM_PARADE_PS8622=m
    # CONFIG_DRM_STI is not set

    #
    @@ -3335,13 +3335,13 @@ CONFIG_FB_MODE_HELPERS=y
    # CONFIG_FB_SMSCUFX is not set
    # CONFIG_FB_UDL is not set
    # CONFIG_FB_IBM_GXT4500 is not set
    -# CONFIG_FB_DA8XX is not set
    +CONFIG_FB_DA8XX=y
    # CONFIG_FB_VIRTUAL is not set
    # CONFIG_FB_METRONOME is not set
    # CONFIG_FB_MB862XX is not set
    # CONFIG_FB_BROADSHEET is not set
    # CONFIG_FB_AUO_K190X is not set
    -CONFIG_FB_SIMPLE=y
    +# CONFIG_FB_SIMPLE=y
    # CONFIG_FB_SSD1307 is not set
    # CONFIG_FB_SM712 is not set
    CONFIG_BACKLIGHT_LCD_SUPPORT=y

    I can't still see da8xx driver log message. fb_probe() in da8xx-fb.c is not called.