drm/amd/display: Add max bpc debugfs
[Why] Useful for testing when setting a max bpc value higher than the default is required [How] Allow for reading/writing of the max_requested_bpc property of the connector Tested-by: Daniel Wheeler <daniel.wheeler@amd.com> Signed-off-by: Eryk Brol <eryk.brol@amd.com> Signed-off-by: Ilya Bakoulin <Ilya.Bakoulin@amd.com> Reviewed-by: Mikita Lipski <Mikita.Lipski@amd.com> Acked-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Eryk Brol
Alex Deucher
parent
4cda3243ec
commit
cca912e0a6
@ -2152,6 +2152,149 @@ static ssize_t dp_dsc_slice_bpg_offset_read(struct file *f, char __user *buf,
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return result;
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}
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/*
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* function description: Read max_requested_bpc property from the connector
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*
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* Access it with the following command:
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*
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* cat /sys/kernel/debug/dri/0/DP-X/max_bpc
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*
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*/
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static ssize_t dp_max_bpc_read(struct file *f, char __user *buf,
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size_t size, loff_t *pos)
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{
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struct amdgpu_dm_connector *aconnector = file_inode(f)->i_private;
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struct drm_connector *connector = &aconnector->base;
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struct drm_device *dev = connector->dev;
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struct dm_connector_state *state;
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ssize_t result = 0;
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char *rd_buf = NULL;
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char *rd_buf_ptr = NULL;
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const uint32_t rd_buf_size = 10;
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int r;
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rd_buf = kcalloc(rd_buf_size, sizeof(char), GFP_KERNEL);
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if (!rd_buf)
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return -ENOMEM;
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mutex_lock(&dev->mode_config.mutex);
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drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
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if (connector->state == NULL)
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goto unlock;
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state = to_dm_connector_state(connector->state);
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rd_buf_ptr = rd_buf;
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snprintf(rd_buf_ptr, rd_buf_size,
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"%u\n",
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state->base.max_requested_bpc);
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while (size) {
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if (*pos >= rd_buf_size)
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break;
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r = put_user(*(rd_buf + result), buf);
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if (r) {
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result = r; /* r = -EFAULT */
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goto unlock;
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}
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buf += 1;
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size -= 1;
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*pos += 1;
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result += 1;
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}
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unlock:
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drm_modeset_unlock(&dev->mode_config.connection_mutex);
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mutex_unlock(&dev->mode_config.mutex);
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kfree(rd_buf);
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return result;
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}
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/*
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* function description: Set max_requested_bpc property on the connector
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*
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* This function will not force the input BPC on connector, it will only
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* change the max value. This is equivalent to setting max_bpc through
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* xrandr.
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*
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* The BPC value written must be >= 6 and <= 16. Values outside of this
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* range will result in errors.
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*
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* BPC values:
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* 0x6 - 6 BPC
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* 0x8 - 8 BPC
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* 0xa - 10 BPC
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* 0xc - 12 BPC
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* 0x10 - 16 BPC
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*
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* Write the max_bpc in the following way:
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*
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* echo 0x6 > /sys/kernel/debug/dri/0/DP-X/max_bpc
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*
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*/
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static ssize_t dp_max_bpc_write(struct file *f, const char __user *buf,
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size_t size, loff_t *pos)
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{
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struct amdgpu_dm_connector *aconnector = file_inode(f)->i_private;
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struct drm_connector *connector = &aconnector->base;
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struct dm_connector_state *state;
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struct drm_device *dev = connector->dev;
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char *wr_buf = NULL;
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uint32_t wr_buf_size = 42;
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int max_param_num = 1;
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long param[1] = {0};
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uint8_t param_nums = 0;
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if (size == 0)
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return -EINVAL;
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wr_buf = kcalloc(wr_buf_size, sizeof(char), GFP_KERNEL);
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if (!wr_buf) {
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DRM_DEBUG_DRIVER("no memory to allocate write buffer\n");
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return -ENOSPC;
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}
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if (parse_write_buffer_into_params(wr_buf, size,
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(long *)param, buf,
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max_param_num,
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¶m_nums)) {
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kfree(wr_buf);
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return -EINVAL;
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}
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if (param_nums <= 0) {
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DRM_DEBUG_DRIVER("user data not be read\n");
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kfree(wr_buf);
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return -EINVAL;
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}
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if (param[0] < 6 || param[0] > 16) {
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DRM_DEBUG_DRIVER("bad max_bpc value\n");
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kfree(wr_buf);
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return -EINVAL;
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}
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mutex_lock(&dev->mode_config.mutex);
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drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
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if (connector->state == NULL)
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goto unlock;
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state = to_dm_connector_state(connector->state);
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state->base.max_requested_bpc = param[0];
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unlock:
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drm_modeset_unlock(&dev->mode_config.connection_mutex);
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mutex_unlock(&dev->mode_config.mutex);
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kfree(wr_buf);
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return size;
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}
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DEFINE_SHOW_ATTRIBUTE(dp_dsc_fec_support);
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DEFINE_SHOW_ATTRIBUTE(dmub_fw_state);
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DEFINE_SHOW_ATTRIBUTE(dmub_tracebuffer);
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@ -2263,6 +2406,13 @@ static const struct file_operations dp_dpcd_data_debugfs_fops = {
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.llseek = default_llseek
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};
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static const struct file_operations dp_max_bpc_debugfs_fops = {
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.owner = THIS_MODULE,
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.read = dp_max_bpc_read,
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.write = dp_max_bpc_write,
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.llseek = default_llseek
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};
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static const struct {
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char *name;
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const struct file_operations *fops;
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@ -2285,7 +2435,8 @@ static const struct {
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{"dsc_pic_height", &dp_dsc_pic_height_debugfs_fops},
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{"dsc_chunk_size", &dp_dsc_chunk_size_debugfs_fops},
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{"dsc_slice_bpg", &dp_dsc_slice_bpg_offset_debugfs_fops},
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{"dp_dsc_fec_support", &dp_dsc_fec_support_fops}
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{"dp_dsc_fec_support", &dp_dsc_fec_support_fops},
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{"max_bpc", &dp_max_bpc_debugfs_fops}
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};
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#ifdef CONFIG_DRM_AMD_DC_HDCP
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