Re: [DPU PATCH v3 1/2] drm/msm/dsi: adjust dsi timing for dual dsi mode

[Archit Taneja <architt-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>]

On Thursday 19 April 2018 01:15 AM, Chandan Uddaraju wrote:
> For dual dsi mode, the horizontal timing needs
> to be divided by half since both the dsi controllers
> will be driving this panel. Adjust the pixel clock and
> DSI timing accordingly.

Reviewed-by: Archit Taneja <architt@codeaurora.org>

> 
> Changes in V2:
> --Removed Change-Id from the commit text tags.
> 
> Changes in V3:
> --Instead of adjusting the DRM mode structure, divide
>    the clocks and horizontal timings in DSI host just
>    before configuring the values.
> 
> Signed-off-by: Chandan Uddaraju <chandanu@codeaurora.org>
> ---
>   drivers/gpu/drm/msm/dsi/dsi.h         |  6 ++--
>   drivers/gpu/drm/msm/dsi/dsi_host.c    | 55 ++++++++++++++++++++++++++++-------
>   drivers/gpu/drm/msm/dsi/dsi_manager.c |  7 +++--
>   3 files changed, 52 insertions(+), 16 deletions(-)
> 
> diff --git a/drivers/gpu/drm/msm/dsi/dsi.h b/drivers/gpu/drm/msm/dsi/dsi.h
> index 70d9a9a..01c38f6 100644
> --- a/drivers/gpu/drm/msm/dsi/dsi.h
> +++ b/drivers/gpu/drm/msm/dsi/dsi.h
> @@ -162,7 +162,8 @@ void msm_dsi_host_cmd_xfer_commit(struct mipi_dsi_host *host,
>   int msm_dsi_host_enable(struct mipi_dsi_host *host);
>   int msm_dsi_host_disable(struct mipi_dsi_host *host);
>   int msm_dsi_host_power_on(struct mipi_dsi_host *host,
> -			struct msm_dsi_phy_shared_timings *phy_shared_timings);
> +			struct msm_dsi_phy_shared_timings *phy_shared_timings,
> +			bool is_dual_dsi);
>   int msm_dsi_host_power_off(struct mipi_dsi_host *host);
>   int msm_dsi_host_set_display_mode(struct mipi_dsi_host *host,
>   					struct drm_display_mode *mode);
> @@ -175,7 +176,8 @@ int msm_dsi_host_set_src_pll(struct mipi_dsi_host *host,
>   			struct msm_dsi_pll *src_pll);
>   void msm_dsi_host_reset_phy(struct mipi_dsi_host *host);
>   void msm_dsi_host_get_phy_clk_req(struct mipi_dsi_host *host,
> -	struct msm_dsi_phy_clk_request *clk_req);
> +	struct msm_dsi_phy_clk_request *clk_req,
> +	bool is_dual_dsi);
>   void msm_dsi_host_destroy(struct mipi_dsi_host *host);
>   int msm_dsi_host_modeset_init(struct mipi_dsi_host *host,
>   					struct drm_device *dev);
> diff --git a/drivers/gpu/drm/msm/dsi/dsi_host.c b/drivers/gpu/drm/msm/dsi/dsi_host.c
> index 7a03a94..75d527e 100644
> --- a/drivers/gpu/drm/msm/dsi/dsi_host.c
> +++ b/drivers/gpu/drm/msm/dsi/dsi_host.c
> @@ -118,6 +118,7 @@ struct msm_dsi_host {
>   	struct clk *byte_intf_clk;
>   
>   	u32 byte_clk_rate;
> +	u32 pixel_clk_rate;
>   	u32 esc_clk_rate;
>   
>   	/* DSI v2 specific clocks */
> @@ -510,7 +511,7 @@ static int dsi_link_clk_enable_6g(struct msm_dsi_host *msm_host)
>   		goto error;
>   	}
>   
> -	ret = clk_set_rate(msm_host->pixel_clk, msm_host->mode->clock * 1000);
> +	ret = clk_set_rate(msm_host->pixel_clk, msm_host->pixel_clk_rate);
>   	if (ret) {
>   		pr_err("%s: Failed to set rate pixel clk, %d\n", __func__, ret);
>   		goto error;
> @@ -591,7 +592,7 @@ static int dsi_link_clk_enable_v2(struct msm_dsi_host *msm_host)
>   		goto error;
>   	}
>   
> -	ret = clk_set_rate(msm_host->pixel_clk, msm_host->mode->clock * 1000);
> +	ret = clk_set_rate(msm_host->pixel_clk, msm_host->pixel_clk_rate);
>   	if (ret) {
>   		pr_err("%s: Failed to set rate pixel clk, %d\n", __func__, ret);
>   		goto error;
> @@ -661,7 +662,7 @@ static void dsi_link_clk_disable(struct msm_dsi_host *msm_host)
>   	}
>   }
>   
> -static int dsi_calc_clk_rate(struct msm_dsi_host *msm_host)
> +static int dsi_calc_clk_rate(struct msm_dsi_host *msm_host, bool is_dual_dsi)
>   {
>   	struct drm_display_mode *mode = msm_host->mode;
>   	const struct msm_dsi_cfg_handler *cfg_hnd = msm_host->cfg_hnd;
> @@ -675,14 +676,28 @@ static int dsi_calc_clk_rate(struct msm_dsi_host *msm_host)
>   	}
>   
>   	pclk_rate = mode->clock * 1000;
> +
> +	/*
> +	 * For dual DSI mode, the current DRM mode has
> +	 * the complete width of the panel. Since, the complete
> +	 * panel is driven by two DSI controllers, the
> +	 * the clock rates have to be split between
> +	 * the two dsi controllers. Adjust the byte and
> +	 * pixel clock rates for each dsi host accordingly.
> +	 */
> +	if (is_dual_dsi)
> +		pclk_rate /= 2;
> +
>   	if (lanes > 0) {
>   		msm_host->byte_clk_rate = (pclk_rate * bpp) / (8 * lanes);
>   	} else {
>   		pr_err("%s: forcing mdss_dsi lanes to 1\n", __func__);
>   		msm_host->byte_clk_rate = (pclk_rate * bpp) / 8;
>   	}
> +	msm_host->pixel_clk_rate = pclk_rate;
>   
> -	DBG("pclk=%d, bclk=%d", pclk_rate, msm_host->byte_clk_rate);
> +	DBG("pclk=%d, bclk=%d", msm_host->pixel_clk_rate,
> +				msm_host->byte_clk_rate);
>   
>   	msm_host->esc_clk_rate = clk_get_rate(msm_host->esc_clk);
>   
> @@ -884,7 +899,7 @@ static void dsi_ctrl_config(struct msm_dsi_host *msm_host, bool enable,
>   	dsi_write(msm_host, REG_DSI_CTRL, data);
>   }
>   
> -static void dsi_timing_setup(struct msm_dsi_host *msm_host)
> +static void dsi_timing_setup(struct msm_dsi_host *msm_host, bool is_dual_dsi)
>   {
>   	struct drm_display_mode *mode = msm_host->mode;
>   	u32 hs_start = 0, vs_start = 0; /* take sync start as 0 */
> @@ -896,10 +911,26 @@ static void dsi_timing_setup(struct msm_dsi_host *msm_host)
>   	u32 ha_end = ha_start + mode->hdisplay;
>   	u32 va_start = v_total - mode->vsync_start;
>   	u32 va_end = va_start + mode->vdisplay;
> +	u32 hdisplay = mode->hdisplay;
>   	u32 wc;
>   
>   	DBG("");
>   
> +	/*
> +	 * For dual DSI mode, the current DRM mode has
> +	 * the complete width of the panel. Since, the complete
> +	 * panel is driven by two DSI controllers, the horizontal
> +	 * timings have to be split between the two dsi controllers.
> +	 * Adjust the DSI host timing values accordingly.
> +	 */
> +	if (is_dual_dsi) {
> +		h_total /= 2;
> +		hs_end /= 2;
> +		ha_start /= 2;
> +		ha_end /= 2;
> +		hdisplay /= 2;
> +	}
> +
>   	if (msm_host->mode_flags & MIPI_DSI_MODE_VIDEO) {
>   		dsi_write(msm_host, REG_DSI_ACTIVE_H,
>   			DSI_ACTIVE_H_START(ha_start) |
> @@ -920,7 +951,7 @@ static void dsi_timing_setup(struct msm_dsi_host *msm_host)
>   			DSI_ACTIVE_VSYNC_VPOS_END(vs_end));
>   	} else {		/* command mode */
>   		/* image data and 1 byte write_memory_start cmd */
> -		wc = mode->hdisplay * dsi_get_bpp(msm_host->format) / 8 + 1;
> +		wc = hdisplay * dsi_get_bpp(msm_host->format) / 8 + 1;
>   
>   		dsi_write(msm_host, REG_DSI_CMD_MDP_STREAM_CTRL,
>   			DSI_CMD_MDP_STREAM_CTRL_WORD_COUNT(wc) |
> @@ -930,7 +961,7 @@ static void dsi_timing_setup(struct msm_dsi_host *msm_host)
>   					MIPI_DSI_DCS_LONG_WRITE));
>   
>   		dsi_write(msm_host, REG_DSI_CMD_MDP_STREAM_TOTAL,
> -			DSI_CMD_MDP_STREAM_TOTAL_H_TOTAL(mode->hdisplay) |
> +			DSI_CMD_MDP_STREAM_TOTAL_H_TOTAL(hdisplay) |
>   			DSI_CMD_MDP_STREAM_TOTAL_V_TOTAL(mode->vdisplay));
>   	}
>   }
> @@ -2172,12 +2203,13 @@ void msm_dsi_host_reset_phy(struct mipi_dsi_host *host)
>   }
>   
>   void msm_dsi_host_get_phy_clk_req(struct mipi_dsi_host *host,
> -	struct msm_dsi_phy_clk_request *clk_req)
> +			struct msm_dsi_phy_clk_request *clk_req,
> +			bool is_dual_dsi)
>   {
>   	struct msm_dsi_host *msm_host = to_msm_dsi_host(host);
>   	int ret;
>   
> -	ret = dsi_calc_clk_rate(msm_host);
> +	ret = dsi_calc_clk_rate(msm_host, is_dual_dsi);
>   	if (ret) {
>   		pr_err("%s: unable to calc clk rate, %d\n", __func__, ret);
>   		return;
> @@ -2238,7 +2270,8 @@ static void msm_dsi_sfpb_config(struct msm_dsi_host *msm_host, bool enable)
>   }
>   
>   int msm_dsi_host_power_on(struct mipi_dsi_host *host,
> -			struct msm_dsi_phy_shared_timings *phy_shared_timings)
> +			struct msm_dsi_phy_shared_timings *phy_shared_timings,
> +			bool is_dual_dsi)
>   {
>   	struct msm_dsi_host *msm_host = to_msm_dsi_host(host);
>   	int ret = 0;
> @@ -2273,7 +2306,7 @@ int msm_dsi_host_power_on(struct mipi_dsi_host *host,
>   		goto fail_disable_clk;
>   	}
>   
> -	dsi_timing_setup(msm_host);
> +	dsi_timing_setup(msm_host, is_dual_dsi);
>   	dsi_sw_reset(msm_host);
>   	dsi_ctrl_config(msm_host, true, phy_shared_timings);
>   
> diff --git a/drivers/gpu/drm/msm/dsi/dsi_manager.c b/drivers/gpu/drm/msm/dsi/dsi_manager.c
> index 4cb1cb6..3bb506b 100644
> --- a/drivers/gpu/drm/msm/dsi/dsi_manager.c
> +++ b/drivers/gpu/drm/msm/dsi/dsi_manager.c
> @@ -134,8 +134,9 @@ static int enable_phy(struct msm_dsi *msm_dsi, int src_pll_id,
>   {
>   	struct msm_dsi_phy_clk_request clk_req;
>   	int ret;
> +	bool is_dual_dsi = IS_DUAL_DSI();
>   
> -	msm_dsi_host_get_phy_clk_req(msm_dsi->host, &clk_req);
> +	msm_dsi_host_get_phy_clk_req(msm_dsi->host, &clk_req, is_dual_dsi);
>   
>   	ret = msm_dsi_phy_enable(msm_dsi->phy, src_pll_id, &clk_req);
>   	msm_dsi_phy_get_shared_timings(msm_dsi->phy, shared_timings);
> @@ -458,7 +459,7 @@ static void dsi_mgr_bridge_pre_enable(struct drm_bridge *bridge)
>   	if (is_dual_dsi && (DSI_1 == id))
>   		return;
>   
> -	ret = msm_dsi_host_power_on(host, &phy_shared_timings[id]);
> +	ret = msm_dsi_host_power_on(host, &phy_shared_timings[id], is_dual_dsi);
>   	if (ret) {
>   		pr_err("%s: power on host %d failed, %d\n", __func__, id, ret);
>   		goto host_on_fail;
> @@ -466,7 +467,7 @@ static void dsi_mgr_bridge_pre_enable(struct drm_bridge *bridge)
>   
>   	if (is_dual_dsi && msm_dsi1) {
>   		ret = msm_dsi_host_power_on(msm_dsi1->host,
> -					    &phy_shared_timings[DSI_1]);
> +				&phy_shared_timings[DSI_1], is_dual_dsi);
>   		if (ret) {
>   			pr_err("%s: power on host1 failed, %d\n",
>   							__func__, ret);
> 
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