diff options
Diffstat (limited to 'drivers/gpu/drm/i915/display/intel_display_params.c')
| -rw-r--r-- | drivers/gpu/drm/i915/display/intel_display_params.c | 217 |
1 files changed, 217 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/display/intel_display_params.c b/drivers/gpu/drm/i915/display/intel_display_params.c new file mode 100644 index 0000000000..11e03cfb77 --- /dev/null +++ b/drivers/gpu/drm/i915/display/intel_display_params.c @@ -0,0 +1,217 @@ +// SPDX-License-Identifier: MIT +/* + * Copyright © 2023 Intel Corporation + */ + +#include "intel_display_params.h" +#include "i915_drv.h" + +#define intel_display_param_named(name, T, perm, desc) \ + module_param_named(name, intel_display_modparams.name, T, perm); \ + MODULE_PARM_DESC(name, desc) +#define intel_display_param_named_unsafe(name, T, perm, desc) \ + module_param_named_unsafe(name, intel_display_modparams.name, T, perm); \ + MODULE_PARM_DESC(name, desc) + +static struct intel_display_params intel_display_modparams __read_mostly = { +#define MEMBER(T, member, value, ...) .member = (value), + INTEL_DISPLAY_PARAMS_FOR_EACH(MEMBER) +#undef MEMBER +}; +/* + * Note: As a rule, keep module parameter sysfs permissions read-only + * 0400. Runtime changes are only supported through i915 debugfs. + * + * For any exceptions requiring write access and runtime changes through module + * parameter sysfs, prevent debugfs file creation by setting the parameter's + * debugfs mode to 0. + */ + +intel_display_param_named_unsafe(vbt_firmware, charp, 0400, + "Load VBT from specified file under /lib/firmware"); + +intel_display_param_named_unsafe(lvds_channel_mode, int, 0400, + "Specify LVDS channel mode " + "(0=probe BIOS [default], 1=single-channel, 2=dual-channel)"); + +intel_display_param_named_unsafe(panel_use_ssc, int, 0400, + "Use Spread Spectrum Clock with panels [LVDS/eDP] " + "(default: auto from VBT)"); + +intel_display_param_named_unsafe(vbt_sdvo_panel_type, int, 0400, + "Override/Ignore selection of SDVO panel mode in the VBT " + "(-2=ignore, -1=auto [default], index in VBT BIOS table)"); + +intel_display_param_named_unsafe(enable_dc, int, 0400, + "Enable power-saving display C-states. " + "(-1=auto [default]; 0=disable; 1=up to DC5; 2=up to DC6; " + "3=up to DC5 with DC3CO; 4=up to DC6 with DC3CO)"); + +intel_display_param_named_unsafe(enable_dpt, bool, 0400, + "Enable display page table (DPT) (default: true)"); + +intel_display_param_named_unsafe(enable_sagv, bool, 0400, + "Enable system agent voltage/frequency scaling (SAGV) (default: true)"); + +intel_display_param_named_unsafe(disable_power_well, int, 0400, + "Disable display power wells when possible " + "(-1=auto [default], 0=power wells always on, 1=power wells disabled when possible)"); + +intel_display_param_named_unsafe(enable_ips, bool, 0400, "Enable IPS (default: true)"); + +intel_display_param_named_unsafe(invert_brightness, int, 0400, + "Invert backlight brightness " + "(-1 force normal, 0 machine defaults, 1 force inversion), please " + "report PCI device ID, subsystem vendor and subsystem device ID " + "to dri-devel@lists.freedesktop.org, if your machine needs it. " + "It will then be included in an upcoming module version."); + +/* WA to get away with the default setting in VBT for early platforms.Will be removed */ +intel_display_param_named_unsafe(edp_vswing, int, 0400, + "Ignore/Override vswing pre-emph table selection from VBT " + "(0=use value from vbt [default], 1=low power swing(200mV)," + "2=default swing(400mV))"); + +intel_display_param_named(enable_dpcd_backlight, int, 0400, + "Enable support for DPCD backlight control" + "(-1=use per-VBT LFP backlight type setting [default], 0=disabled, 1=enable, 2=force VESA interface, 3=force Intel interface)"); + +intel_display_param_named_unsafe(load_detect_test, bool, 0400, + "Force-enable the VGA load detect code for testing (default:false). " + "For developers only."); + +intel_display_param_named_unsafe(force_reset_modeset_test, bool, 0400, + "Force a modeset during gpu reset for testing (default:false). " + "For developers only."); + +intel_display_param_named(disable_display, bool, 0400, + "Disable display (default: false)"); + +intel_display_param_named(verbose_state_checks, bool, 0400, + "Enable verbose logs (ie. WARN_ON()) in case of unexpected hw state conditions."); + +intel_display_param_named_unsafe(nuclear_pageflip, bool, 0400, + "Force enable atomic functionality on platforms that don't have full support yet."); + +intel_display_param_named_unsafe(enable_dp_mst, bool, 0400, + "Enable multi-stream transport (MST) for new DisplayPort sinks. (default: true)"); + +intel_display_param_named_unsafe(enable_fbc, int, 0400, + "Enable frame buffer compression for power savings " + "(default: -1 (use per-chip default))"); + +intel_display_param_named_unsafe(enable_psr, int, 0400, + "Enable PSR " + "(0=disabled, 1=enable up to PSR1, 2=enable up to PSR2) " + "Default: -1 (use per-chip default)"); + +intel_display_param_named(psr_safest_params, bool, 0400, + "Replace PSR VBT parameters by the safest and not optimal ones. This " + "is helpful to detect if PSR issues are related to bad values set in " + " VBT. (0=use VBT parameters, 1=use safest parameters)" + "Default: 0"); + +intel_display_param_named_unsafe(enable_psr2_sel_fetch, bool, 0400, + "Enable PSR2 selective fetch " + "(0=disabled, 1=enabled) " + "Default: 1"); + +__maybe_unused +static void _param_print_bool(struct drm_printer *p, const char *driver_name, + const char *name, bool val) +{ + drm_printf(p, "%s.%s=%s\n", driver_name, name, str_yes_no(val)); +} + +__maybe_unused +static void _param_print_int(struct drm_printer *p, const char *driver_name, + const char *name, int val) +{ + drm_printf(p, "%s.%s=%d\n", driver_name, name, val); +} + +__maybe_unused +static void _param_print_uint(struct drm_printer *p, const char *driver_name, + const char *name, unsigned int val) +{ + drm_printf(p, "%s.%s=%u\n", driver_name, name, val); +} + +__maybe_unused +static void _param_print_ulong(struct drm_printer *p, const char *driver_name, + const char *name, unsigned long val) +{ + drm_printf(p, "%s.%s=%lu\n", driver_name, name, val); +} + +__maybe_unused +static void _param_print_charp(struct drm_printer *p, const char *driver_name, + const char *name, const char *val) +{ + drm_printf(p, "%s.%s=%s\n", driver_name, name, val); +} + +#define _param_print(p, driver_name, name, val) \ + _Generic(val, \ + bool : _param_print_bool, \ + int : _param_print_int, \ + unsigned int : _param_print_uint, \ + unsigned long : _param_print_ulong, \ + char * : _param_print_charp)(p, driver_name, name, val) + +/** + * intel_display_params_dump - dump intel display modparams + * @i915: i915 device + * @p: the &drm_printer + * + * Pretty printer for i915 modparams. + */ +void intel_display_params_dump(struct drm_i915_private *i915, struct drm_printer *p) +{ +#define PRINT(T, x, ...) _param_print(p, i915->drm.driver->name, #x, i915->display.params.x); + INTEL_DISPLAY_PARAMS_FOR_EACH(PRINT); +#undef PRINT +} + +__maybe_unused static void _param_dup_charp(char **valp) +{ + *valp = kstrdup(*valp ? *valp : "", GFP_ATOMIC); +} + +__maybe_unused static void _param_nop(void *valp) +{ +} + +#define _param_dup(valp) \ + _Generic(valp, \ + char ** : _param_dup_charp, \ + default : _param_nop) \ + (valp) + +void intel_display_params_copy(struct intel_display_params *dest) +{ + *dest = intel_display_modparams; +#define DUP(T, x, ...) _param_dup(&dest->x); + INTEL_DISPLAY_PARAMS_FOR_EACH(DUP); +#undef DUP +} + +__maybe_unused static void _param_free_charp(char **valp) +{ + kfree(*valp); + *valp = NULL; +} + +#define _param_free(valp) \ + _Generic(valp, \ + char ** : _param_free_charp, \ + default : _param_nop) \ + (valp) + +/* free the allocated members, *not* the passed in params itself */ +void intel_display_params_free(struct intel_display_params *params) +{ +#define FREE(T, x, ...) _param_free(¶ms->x); + INTEL_DISPLAY_PARAMS_FOR_EACH(FREE); +#undef FREE +} |