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/* SPDX-License-Identifier: MIT */
/*
* Copyright © 2025 Intel Corporation
*/
#include "kms_joiner_helper.h"
#include "igt.h"
#include "igt_kms.h"
#include "intel_chipset.h"
/*
* Detect if the output needs 1, 2, or 4 pipes (non-joiner, big joiner, ultra).
*/
static int get_required_pipes(int drm_fd, igt_output_t *output)
{
bool is_big = false, is_ultra = false;
int max_dotclock;
drmModeModeInfo mode;
if (!is_intel_device(drm_fd))
return -1;
max_dotclock = igt_get_max_dotclock(drm_fd);
is_ultra = ultrajoiner_mode_found(drm_fd,
output->config.connector,
max_dotclock,
&mode);
is_big = bigjoiner_mode_found(drm_fd,
output->config.connector,
max_dotclock,
&mode);
if (is_ultra)
return 4;
if (is_big)
return 2;
return 1;
}
/*
* Internal helper to find a block of consecutive free pipes
* in available_pipes_mask. If count > 1, the first pipe must also
* be in master_pipes_mask.
*
* Returns the starting pipe index or -1 if not found.
*/
static int find_consecutive_pipes(int n_pipes,
uint32_t available_pipes_mask,
uint32_t master_pipes_mask,
int count)
{
int i = 0, pipe_idx = 0;
bool can_use;
for (int start = 0; start < n_pipes; start++) {
if (((start + count) - 1) >= n_pipes)
break;
if ((count > 1) && (!(BIT(start) & master_pipes_mask)))
continue;
can_use = true;
for (i = 0; i < count; i++) {
pipe_idx = start + i;
if (!(BIT(pipe_idx) & available_pipes_mask)) {
can_use = false;
break;
}
}
if (can_use)
return start;
}
return -1;
}
static enum pipe get_next_master_pipe(uint32_t pipe_mask)
{
int i;
if (!pipe_mask)
return PIPE_NONE;
i = ffs(pipe_mask) - 1;
if (i < 0)
return PIPE_NONE;
return i;
}
/**
* igt_set_all_master_pipes_for_platform:
* @master_pipes: Pointer to the variable to store the master pipes bitmask.
* @display: The display structure containing pipe information.
*
* This function sets the master pipes for the platform by checking if consecutive
* pipes are enabled. If both pipe and the next pipe are enabled, the pipe is
* considered a master pipe.
*/
void igt_set_all_master_pipes_for_platform(igt_display_t *display, uint32_t *master_pipes)
{
enum pipe pipe;
*master_pipes = 0;
for (pipe = PIPE_A; pipe < IGT_MAX_PIPES - 1; pipe++) {
if (display->pipes[pipe].enabled && display->pipes[pipe + 1].enabled) {
*master_pipes |= BIT(pipe);
igt_info("Found master pipe %s\n", kmstest_pipe_name(pipe));
}
}
}
/*
* @drm_fd: DRM file descriptor
* @outputs: array of pointers to igt_output_t
* @num_outputs: how many outputs in the array
* @n_pipes: total number of pipes available
* @used_pipes_mask: pointer to a bitmask (in/out) of already-used pipes
* @master_pipes_mask: bitmask of valid "master" pipes
* @valid_pipes_mask: bitmask of valid (non-fused) pipes
*
* Assign pipes to outputs based on the number of required pipes.
* This function will assign 1, 2, or 4 consecutive pipes to each output.
* It will also mark the used pipes in the bitmask.
*
* Returns: true if all outputs can be assigned successfully; false otherwise.
*/
bool igt_assign_pipes_for_outputs(int drm_fd,
igt_output_t **outputs,
int num_outputs,
int n_pipes,
uint32_t *used_pipes_mask,
uint32_t master_pipes_mask,
uint32_t valid_pipes_mask)
{
int i = 0, idx = 0, needed = 0, start = 0;
uint32_t available_pipes_mask = 0;
enum pipe mp = PIPE_NONE;
igt_output_t *out;
for (idx = 0; idx < num_outputs; idx++) {
out = outputs[idx];
needed = get_required_pipes(drm_fd, out);
if (needed < 0)
return false;
available_pipes_mask = (~(*used_pipes_mask)) & valid_pipes_mask;
start = find_consecutive_pipes(n_pipes, available_pipes_mask,
master_pipes_mask, needed);
if (start < 0) {
igt_debug("Cannot allocate %d consecutive pipes for output %s\n",
needed, out->name);
return false;
}
igt_info("Assigning %d pipes [start=%s..%s] to output %s\n",
needed, kmstest_pipe_name(start),
kmstest_pipe_name(start + needed - 1), out->name);
if (needed > 1) {
mp = get_next_master_pipe(BIT(start));
if (mp == PIPE_NONE) {
igt_debug("Failed to confirm master pipe for %s\n",
out->name);
return false;
}
igt_output_set_pipe(out, start);
igt_debug("Using pipe %s as master.\n",
kmstest_pipe_name(start));
} else
igt_output_set_pipe(out, start);
for (i = 0; i < needed; i++)
*used_pipes_mask |= BIT(start + i);
}
return true;
}
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