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Commit 62b2f026 authored by Archit Taneja's avatar Archit Taneja
Browse files

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



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: default avatarArchit Taneja <architt@codeaurora.org>
parent 78fa479d

drivers/gpu/drm/bridge/adv7511/adv7511.h

+6 −0
Original line number Diff line number Diff line
@@ -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;

drivers/gpu/drm/bridge/adv7511/adv7511_drv.c

+3 −0
Original line number Diff line number Diff line
@@ -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);



	/*

drivers/gpu/drm/bridge/adv7511/adv7533.c

+22 −0
Original line number Diff line number Diff line
@@ -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,