diff options
| author | Tony Lindgren <tony@atomide.com> | 2024-02-25 08:19:39 +0200 |
|---|---|---|
| committer | Robert Foss <rfoss@kernel.org> | 2024-04-23 17:33:23 +0200 |
| commit | ec710af54a1cf0c905865e5276bd38fea8fce57d (patch) | |
| tree | 7d8282799ef24a7084f4720188015e488fd67f9a | |
| parent | ce2196dbba66a2a40020d6045a48eeab0091db01 (diff) | |
drm/bridge: tc358775: Configure hs_rate and lp_rate
The hs_rate and lp_rate may be used by the dsi host for timing
calculations. The tc358775 has a maximum bit rate of 1 Gbps/lane,
tc358765 has maximurate of 800 Mbps per lane.
Reviewed-by: Michael Walle <mwalle@kernel.org>
Signed-off-by: Tony Lindgren <tony@atomide.com>
Reviewed-by: Robert Foss <rfoss@kernel.org>
Signed-off-by: Robert Foss <rfoss@kernel.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20240225062008.33191-11-tony@atomide.com
| -rw-r--r-- | drivers/gpu/drm/bridge/tc358775.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/drivers/gpu/drm/bridge/tc358775.c b/drivers/gpu/drm/bridge/tc358775.c index 17a91510019b..3b7cc3be2ccd 100644 --- a/drivers/gpu/drm/bridge/tc358775.c +++ b/drivers/gpu/drm/bridge/tc358775.c @@ -635,6 +635,19 @@ static int tc_attach_host(struct tc_data *tc) dsi->mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_BURST | MIPI_DSI_MODE_LPM; + /* + * The hs_rate and lp_rate are data rate values. The HS mode is + * differential, while the LP mode is single ended. As the HS mode + * uses DDR, the DSI clock frequency is half the hs_rate. The 10 Mbs + * data rate for LP mode is not specified in the bridge data sheet, + * but seems to be part of the MIPI DSI spec. + */ + if (tc->type == TC358765) + dsi->hs_rate = 800000000; + else + dsi->hs_rate = 1000000000; + dsi->lp_rate = 10000000; + ret = devm_mipi_dsi_attach(dev, dsi); if (ret < 0) { dev_err(dev, "failed to attach dsi to host\n"); |