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2f6182616c
DP controller can support generating a color bar signal over the DisplayPort interface. This can be useful to check for possible DDR or GPU problems, as the signal generator resides completely in the DP block. Add debugfs file that controls colorbar generator. echo: config the color bar register to display cat: print the color bar configuration Signed-off-by: Baihan Li <libaihan@huawei.com> Signed-off-by: Yongbang Shi <shiyongbang@huawei.com> Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org> Link: https://lore.kernel.org/r/20250331074212.3370287-7-shiyongbang@huawei.com Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
104 lines
2.7 KiB
C
104 lines
2.7 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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// Copyright (c) 2024 Hisilicon Limited.
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#include <linux/debugfs.h>
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#include <linux/device.h>
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#include <linux/seq_file.h>
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#include <linux/pci.h>
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#include <drm/drm_drv.h>
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#include <drm/drm_file.h>
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#include <drm/drm_debugfs.h>
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#include <drm/drm_edid.h>
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#include "hibmc_drm_drv.h"
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#define MAX_BUF_SIZE 12
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static ssize_t hibmc_control_write(struct file *file, const char __user *user_buf,
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size_t count, loff_t *ppos)
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{
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struct hibmc_drm_private *priv = file_inode(file)->i_private;
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struct hibmc_dp_cbar_cfg *cfg = &priv->dp.cfg;
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int ret, idx;
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u8 buf[MAX_BUF_SIZE];
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if (count >= MAX_BUF_SIZE)
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return -EINVAL;
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if (copy_from_user(buf, user_buf, count))
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return -EFAULT;
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buf[count] = '\0';
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/* Only 4 parameters is allowed, the ranger are as follow:
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* [0] enable/disable colorbar feature
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0: enable colorbar, 1: disable colorbar
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* [1] the timing source of colorbar displaying
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0: timing follows XDP, 1: internal self timing
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* [2] the movment of colorbar displaying
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0: static colorbar image,
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* 1~255: right shifting a type of color per (1~255)frames
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* [3] the color type of colorbar displaying
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0~9: color bar, white, red, orange,
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* yellow, green, cyan, bule, pupper, black
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*/
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if (sscanf(buf, "%hhu %hhu %hhu %u", &cfg->enable, &cfg->self_timing,
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&cfg->dynamic_rate, &cfg->pattern) != 4) {
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return -EINVAL;
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}
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if (cfg->pattern > 9 || cfg->enable > 1 || cfg->self_timing > 1)
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return -EINVAL;
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ret = drm_dev_enter(&priv->dev, &idx);
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if (!ret)
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return -ENODEV;
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hibmc_dp_set_cbar(&priv->dp, cfg);
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drm_dev_exit(idx);
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return count;
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}
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static int hibmc_dp_dbgfs_show(struct seq_file *m, void *arg)
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{
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struct hibmc_drm_private *priv = m->private;
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struct hibmc_dp_cbar_cfg *cfg = &priv->dp.cfg;
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int idx;
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if (!drm_dev_enter(&priv->dev, &idx))
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return -ENODEV;
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seq_printf(m, "hibmc dp colorbar cfg: %u %u %u %u\n", cfg->enable, cfg->self_timing,
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cfg->dynamic_rate, cfg->pattern);
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drm_dev_exit(idx);
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return 0;
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}
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static int hibmc_open(struct inode *inode, struct file *filp)
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{
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return single_open(filp, hibmc_dp_dbgfs_show, inode->i_private);
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}
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static const struct file_operations hibmc_dbg_fops = {
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.owner = THIS_MODULE,
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.write = hibmc_control_write,
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.read = seq_read,
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.open = hibmc_open,
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.llseek = seq_lseek,
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.release = single_release,
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};
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void hibmc_debugfs_init(struct drm_connector *connector, struct dentry *root)
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{
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struct drm_device *dev = connector->dev;
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struct hibmc_drm_private *priv = to_hibmc_drm_private(dev);
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/* create the file in drm directory, so we don't need to remove manually */
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debugfs_create_file("colorbar-cfg", 0200,
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root, priv, &hibmc_dbg_fops);
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}
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