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drm/bridge: adv7533: Change number of DSI lanes dynamically

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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@linaro.org>

Signed-off-by: Archit Taneja <architt@codeaurora.org>
This commit is contained in:
Archit Taneja 2016-06-17 12:15:52 +05:30
parent 78fa479d70
commit 62b2f026cd
3 changed files with 31 additions and 0 deletions
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6
drivers/gpu/drm/bridge/adv7511/adv7511.h
View File

@ -339,6 +339,7 @@ struct adv7511 {
#ifdef CONFIG_DRM_I2C_ADV7533
void adv7533_dsi_power_on(struct adv7511 *adv);
void adv7533_dsi_power_off(struct adv7511 *adv);
void adv7533_mode_set(struct adv7511 *adv, struct drm_display_mode *mode);
int adv7533_patch_registers(struct adv7511 *adv);
void adv7533_uninit_cec(struct adv7511 *adv);
int adv7533_init_cec(struct adv7511 *adv);
@ -354,6 +355,11 @@ static inline void adv7533_dsi_power_off(struct adv7511 *adv)
{
}
static inline void adv7533_mode_set(struct adv7511 *adv,
struct drm_display_mode *mode)
{
}
static inline int adv7533_patch_registers(struct adv7511 *adv)
{
return -ENODEV;

3
drivers/gpu/drm/bridge/adv7511/adv7511_drv.c
View File

@ -712,6 +712,9 @@ 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)
adv7533_mode_set(adv7511, adj_mode);
drm_mode_copy(&adv7511->curr_mode, adj_mode);
/*

22
drivers/gpu/drm/bridge/adv7511/adv7533.c
View File

@ -115,6 +115,28 @@ void adv7533_dsi_power_off(struct adv7511 *adv)
regmap_write(adv->regmap_cec, 0x27, 0x0b);
}
void adv7533_mode_set(struct adv7511 *adv, struct drm_display_mode *mode)
{
struct mipi_dsi_device *dsi = adv->dsi;
int lanes, ret;
if (adv->num_dsi_lanes != 4)
return;
if (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)
dev_err(&dsi->dev, "failed to change host lanes\n");
}
}
int adv7533_patch_registers(struct adv7511 *adv)
{
return regmap_register_patch(adv->regmap,