Unverified Commit aebeb02d authored by Jayshri Pawar's avatar Jayshri Pawar Committed by Robert Foss
Browse files

drm/bridge: cdns-dsi: Add support for pre_enable and post_enable control functions. 



Add support for pre_enable and post_enable drm bridge control functions.
Making sure that host to be prepared before panel is powered up,
for the panels like TC358762.

Signed-off-by: default avatarJayshri Pawar <jpawar@cadence.com>
Reviewed-by: default avatarRobert Foss <robert.foss@linaro.org>
Signed-off-by: default avatarRobert Foss <robert.foss@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20220411140606.15654-1-jpawar@cadence.com
parent dbb3cd0c

drivers/gpu/drm/bridge/cdns-dsi.c

+26 −0
Original line number Diff line number Diff line
@@ -462,6 +462,7 @@ struct cdns_dsi { 
	struct reset_control *dsi_p_rst;

	struct clk *dsi_sys_clk;

	bool link_initialized;

	bool phy_initialized;

	struct phy *dphy;

};
@@ -711,11 +712,21 @@ static void cdns_dsi_bridge_disable(struct drm_bridge *bridge) 
	pm_runtime_put(dsi->base.dev);

}



static void cdns_dsi_bridge_post_disable(struct drm_bridge *bridge)

{

	struct cdns_dsi_input *input = bridge_to_cdns_dsi_input(bridge);

	struct cdns_dsi *dsi = input_to_dsi(input);



	pm_runtime_put(dsi->base.dev);

}



static void cdns_dsi_hs_init(struct cdns_dsi *dsi)

{

	struct cdns_dsi_output *output = &dsi->output;

	u32 status;



	if (dsi->phy_initialized)

		return;

	/*

	 * Power all internal DPHY blocks down and maintain their reset line

	 * asserted before changing the DPHY config.
@@ -739,6 +750,7 @@ static void cdns_dsi_hs_init(struct cdns_dsi *dsi) 
	writel(DPHY_CMN_PSO | DPHY_ALL_D_PDN | DPHY_C_PDN | DPHY_CMN_PDN |

	       DPHY_D_RSTB(output->dev->lanes) | DPHY_C_RSTB,

	       dsi->regs + MCTL_DPHY_CFG0);

	dsi->phy_initialized = true;

}



static void cdns_dsi_init_link(struct cdns_dsi *dsi)
@@ -914,11 +926,25 @@ static void cdns_dsi_bridge_enable(struct drm_bridge *bridge) 
	writel(tmp, dsi->regs + MCTL_MAIN_EN);

}



static void cdns_dsi_bridge_pre_enable(struct drm_bridge *bridge)

{

	struct cdns_dsi_input *input = bridge_to_cdns_dsi_input(bridge);

	struct cdns_dsi *dsi = input_to_dsi(input);



	if (WARN_ON(pm_runtime_get_sync(dsi->base.dev) < 0))

		return;



	cdns_dsi_init_link(dsi);

	cdns_dsi_hs_init(dsi);

}



static const struct drm_bridge_funcs cdns_dsi_bridge_funcs = {

	.attach = cdns_dsi_bridge_attach,

	.mode_valid = cdns_dsi_bridge_mode_valid,

	.disable = cdns_dsi_bridge_disable,

	.pre_enable = cdns_dsi_bridge_pre_enable,

	.enable = cdns_dsi_bridge_enable,

	.post_disable = cdns_dsi_bridge_post_disable,

};



static int cdns_dsi_attach(struct mipi_dsi_host *host,