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drm/bridge: tc358775: Configure hs_rate and lp_rate

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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
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Tony Lindgren 2024-02-25 08:19:39 +02:00 committed by Robert Foss
parent ce2196dbba
commit ec710af54a
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1 changed files with 13 additions and 0 deletions
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13
drivers/gpu/drm/bridge/tc358775.c
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@ -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");