Lower modes on ADV7533 require lower number of DSI lanes for correct
operation. If ADV7533 is being used with 4 DSI lanes, then switch the
lanes to 3 when the target mode's pixel clock is less than 80 Mhz.
Based on patch by Andy Green <andy.green at linaro.org>
Signed-off-by: Archit Taneja <architt at codeaurora.org>
---
drivers/gpu/drm/i2c/adv7511.c | 20 ++++++++++++++++++++
1 file changed, 20 insertions(+)
diff --git a/drivers/gpu/drm/i2c/adv7511.c b/drivers/gpu/drm/i2c/adv7511.c
index 88918ae..ca9e862 100644
--- a/drivers/gpu/drm/i2c/adv7511.c
+++ b/drivers/gpu/drm/i2c/adv7511.c
@@ -863,6 +863,26 @@ static void adv7511_mode_set(struct adv7511 *adv7511,
regmap_update_bits(adv7511->regmap, 0x17,
0x60, (vsync_polarity << 6) | (hsync_polarity << 5));
+ if (adv7511->type == ADV7533 && adv7511->num_dsi_lanes == 4) {
+ struct mipi_dsi_device *dsi = adv7511->dsi;
+ int lanes, ret;
+
+ if (adj_mode->clock > 80000)
+ lanes = 4;
+ else
+ lanes = 3;
+
+ if (lanes != dsi->lanes) {
+ mipi_dsi_detach(dsi);
+ dsi->lanes = lanes;
+ ret = mipi_dsi_attach(dsi);
+ if (ret) {
+ DRM_ERROR("Failed to change host lanes\n");
+ return;
+ }
+ }
+ }
+
drm_mode_copy(&adv7511->curr_mode, adj_mode);
/*
--
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