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// 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_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
}
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