On Sat, Sep 16, 2023 at 02:54:51PM +0200, Hans de Goede wrote: > Hi All, > > Some vlv/chv tablets ship with Android as factory OS. The factory OS > BSP style kernel on these tablets does not use the normal x86 hw > autodetection instead it hardcodes a whole bunch of things including > using panel drivers instead of relying on VBT MIPI sequences to > turn the panel/backlight on/off. > > The normal i915 driver (which does not use panel drivers) mostly works > since the VBT still needs to contain valid info for the GOP, but because > of the Android kernel relying on panel drivers with various things > hardcoded some DMI quirks are necessary to fix some issues on these > devices. > > Some of these issues also are related to which I2C bus to use for > MIPI sequence elements which do I2C transfers. This series also > includes a patch adding some extra debugging to mipi_exec_i2c() to > help with debugging similar issues in the future. > > These patches have been posted before but back then I did not get around > to follow up on the series: > https://lore.kernel.org/intel-gfx/20220225214934.383168-1-hdegoede@xxxxxxxxxx/ > > Changes compared to this old version: > - Drop the changes how the I2C bus number is found, instead just have > the quirks set the right number directly where necessary. This should > avoid any chances of causing regressions on devices where the quirks > do not apply. > > - New quirk for backlight control issues on Lenovo Yoga Tab 3 > > - Address Jani Nikula's remark about __func__ being redundant when using > drm_dbg_kms() > > > Regards, > > Hans > > > > Hans de Goede (4): > drm/i915/vlv_dsi: Add DMI quirk for wrong panel modeline in BIOS on > Asus TF103C (v2) > drm/i915/vlv_dsi: Add DMI quirk for wrong I2C bus and panel size on > Lenovo Yoga Tablet 2 series (v2) > drm/i915/vlv_dsi: Add DMI quirk for backlight control issues on Lenovo > Yoga Tab 3 Please file a bug for each of these and attach the usual drm.debug=0xe dmesg + VBT + any other relevant information there. Otherwise a few years from now I'll be cursing at these commits as well for not leaving a decent papertrail... > drm/i915/dsi: Add some debug logging to mipi_exec_i2c (v2) > > drivers/gpu/drm/i915/display/intel_dsi_vbt.c | 3 + > drivers/gpu/drm/i915/display/vlv_dsi.c | 124 +++++++++++++++++++ > 2 files changed, 127 insertions(+) > > -- > 2.41.0 -- Ville Syrjälä Intel
