Re: [PATCH v2 2/3] drm/msm/dsi: add implementation for helper functions

Sibi S <sibis@xxxxxxxxxxxxxx> · Mon, 26 Mar 2018 22:46:28 +0530

Hi Jordan,
Thanks for the review.

On 03/20/2018 01:53 AM, Jordan Crouse wrote:
On Tue, Mar 20, 2018 at 01:11:02AM +0530, Sibi S wrote:
Add dsi host helper function implementation for DSI v2
DSI 6G 1.x and DSI 6G v2.0+ controllers

Signed-off-by: Sibi S <sibis@xxxxxxxxxxxxxx>
---
  drivers/gpu/drm/msm/dsi/dsi.h      |  15 +++
  drivers/gpu/drm/msm/dsi/dsi_cfg.c  |  56 +++++++--
  drivers/gpu/drm/msm/dsi/dsi_host.c | 236 ++++++++++++++++++++++++++++++++++++-
  3 files changed, 296 insertions(+), 11 deletions(-)

diff --git a/drivers/gpu/drm/msm/dsi/dsi.h b/drivers/gpu/drm/msm/dsi/dsi.h
index 80be83e8fdec..dfa049d876bd 100644
--- a/drivers/gpu/drm/msm/dsi/dsi.h
+++ b/drivers/gpu/drm/msm/dsi/dsi.h
@@ -183,6 +183,21 @@ int msm_dsi_host_modeset_init(struct mipi_dsi_host *host,
  int msm_dsi_host_init(struct msm_dsi *msm_dsi);
  int msm_dsi_runtime_suspend(struct device *dev);
  int msm_dsi_runtime_resume(struct device *dev);
+int dsi_link_clk_enable_6g(struct msm_dsi_host *msm_host);
+int dsi_link_clk_enable_v2(struct msm_dsi_host *msm_host);
+void dsi_link_clk_disable_6g(struct msm_dsi_host *msm_host);
+void dsi_link_clk_disable_v2(struct msm_dsi_host *msm_host);
+int dsi_tx_buf_alloc_6g(struct msm_dsi_host *msm_host, int size);
+int dsi_tx_buf_alloc_v2(struct msm_dsi_host *msm_host, int size);
+void *dsi_tx_buf_get_6g(struct msm_dsi_host *msm_host);
+void *dsi_tx_buf_get_v2(struct msm_dsi_host *msm_host);
+void dsi_tx_buf_put_6g(struct msm_dsi_host *msm_host);
+int dsi_dma_base_get_6g(struct msm_dsi_host *msm_host, uint64_t *iova);
+int dsi_dma_base_get_v2(struct msm_dsi_host *msm_host, uint64_t *iova);
+int dsi_clk_init_v2(struct msm_dsi_host *msm_host);
+int dsi_clk_init_6g_v2(struct msm_dsi_host *msm_host);
+int dsi_calc_clk_rate_v2(struct msm_dsi_host *msm_host);
+int dsi_calc_clk_rate_6g(struct msm_dsi_host *msm_host);
  
  /* dsi phy */
  struct msm_dsi_phy;
diff --git a/drivers/gpu/drm/msm/dsi/dsi_cfg.c b/drivers/gpu/drm/msm/dsi/dsi_cfg.c
index 0327bb54b01b..dcdfb1bb54f9 100644
--- a/drivers/gpu/drm/msm/dsi/dsi_cfg.c
+++ b/drivers/gpu/drm/msm/dsi/dsi_cfg.c
@@ -136,20 +136,58 @@ static const struct msm_dsi_config sdm845_dsi_cfg = {
  	.num_dsi = 2,
  };
  
+const static struct msm_dsi_host_cfg_ops msm_dsi_v2_host_ops = {
+	.link_clk_enable = dsi_link_clk_enable_v2,
+	.link_clk_disable = dsi_link_clk_disable_v2,
+	.clk_init_ver = dsi_clk_init_v2,
+	.tx_buf_alloc = dsi_tx_buf_alloc_v2,
+	.tx_buf_get = dsi_tx_buf_get_v2,
+	.tx_buf_put = NULL,
+	.dma_base_get = dsi_dma_base_get_v2,
+	.calc_clk_rate = dsi_calc_clk_rate_v2,
+};
+
+const static struct msm_dsi_host_cfg_ops msm_dsi_6g_host_ops = {
+	.link_clk_enable = dsi_link_clk_enable_6g,
+	.link_clk_disable = dsi_link_clk_disable_6g,
+	.clk_init_ver = NULL,
+	.tx_buf_alloc = dsi_tx_buf_alloc_6g,
+	.tx_buf_get = dsi_tx_buf_get_6g,
+	.tx_buf_put = dsi_tx_buf_put_6g,
+	.dma_base_get = dsi_dma_base_get_6g,
+	.calc_clk_rate = dsi_calc_clk_rate_6g,
+};
+
+const static struct msm_dsi_host_cfg_ops msm_dsi_6g_v2_host_ops = {
+	.link_clk_enable = dsi_link_clk_enable_6g,
+	.link_clk_disable = dsi_link_clk_disable_6g,
+	.clk_init_ver = dsi_clk_init_6g_v2,
+	.tx_buf_alloc = dsi_tx_buf_alloc_6g,
+	.tx_buf_get = dsi_tx_buf_get_6g,
+	.tx_buf_put = dsi_tx_buf_put_6g,
+	.dma_base_get = dsi_dma_base_get_6g,
+	.calc_clk_rate = dsi_calc_clk_rate_6g,
+};
+
  static const struct msm_dsi_cfg_handler dsi_cfg_handlers[] = {
-	{MSM_DSI_VER_MAJOR_V2, MSM_DSI_V2_VER_MINOR_8064, &apq8064_dsi_cfg},
+	{MSM_DSI_VER_MAJOR_V2, MSM_DSI_V2_VER_MINOR_8064,
+		&apq8064_dsi_cfg, &msm_dsi_v2_host_ops},
  	{MSM_DSI_VER_MAJOR_6G, MSM_DSI_6G_VER_MINOR_V1_0,
-						&msm8974_apq8084_dsi_cfg},
+		&msm8974_apq8084_dsi_cfg, &msm_dsi_6g_host_ops},
  	{MSM_DSI_VER_MAJOR_6G, MSM_DSI_6G_VER_MINOR_V1_1,
-						&msm8974_apq8084_dsi_cfg},
+		&msm8974_apq8084_dsi_cfg, &msm_dsi_6g_host_ops},
  	{MSM_DSI_VER_MAJOR_6G, MSM_DSI_6G_VER_MINOR_V1_1_1,
-						&msm8974_apq8084_dsi_cfg},
+		&msm8974_apq8084_dsi_cfg, &msm_dsi_6g_host_ops},
  	{MSM_DSI_VER_MAJOR_6G, MSM_DSI_6G_VER_MINOR_V1_2,
-						&msm8974_apq8084_dsi_cfg},
-	{MSM_DSI_VER_MAJOR_6G, MSM_DSI_6G_VER_MINOR_V1_3, &msm8994_dsi_cfg},
-	{MSM_DSI_VER_MAJOR_6G, MSM_DSI_6G_VER_MINOR_V1_3_1, &msm8916_dsi_cfg},
-	{MSM_DSI_VER_MAJOR_6G, MSM_DSI_6G_VER_MINOR_V1_4_1, &msm8996_dsi_cfg},
-	{MSM_DSI_VER_MAJOR_6G, MSM_DSI_6G_VER_MINOR_V2_2_1, &sdm845_dsi_cfg},
+		&msm8974_apq8084_dsi_cfg, &msm_dsi_6g_host_ops},
+	{MSM_DSI_VER_MAJOR_6G, MSM_DSI_6G_VER_MINOR_V1_3,
+		&msm8994_dsi_cfg, &msm_dsi_6g_host_ops},
+	{MSM_DSI_VER_MAJOR_6G, MSM_DSI_6G_VER_MINOR_V1_3_1,
+		&msm8916_dsi_cfg, &msm_dsi_6g_host_ops},
+	{MSM_DSI_VER_MAJOR_6G, MSM_DSI_6G_VER_MINOR_V1_4_1,
+		&msm8996_dsi_cfg, &msm_dsi_6g_host_ops},
+	{MSM_DSI_VER_MAJOR_6G, MSM_DSI_6G_VER_MINOR_V2_2_1,
+		&sdm845_dsi_cfg, &msm_dsi_6g_v2_host_ops},
  };
  
  const struct msm_dsi_cfg_handler *msm_dsi_cfg_get(u32 major, u32 minor)
diff --git a/drivers/gpu/drm/msm/dsi/dsi_host.c b/drivers/gpu/drm/msm/dsi/dsi_host.c
index 7a03a9489708..78ea4540f0ee 100644
--- a/drivers/gpu/drm/msm/dsi/dsi_host.c
+++ b/drivers/gpu/drm/msm/dsi/dsi_host.c
@@ -331,6 +331,54 @@ static int dsi_regulator_init(struct msm_dsi_host *msm_host)
  	return 0;
  }
  
+int dsi_clk_init_v2(struct msm_dsi_host *msm_host)
+{
+	struct platform_device *pdev = msm_host->pdev;
+	int ret = 0;
+
+	msm_host->src_clk = msm_clk_get(pdev, "src");
+
+	if (IS_ERR(msm_host->src_clk)) {
+		ret = PTR_ERR(msm_host->src_clk);
+		pr_err("%s: can't find src clock. ret=%d\n",
+			__func__, ret);
+		msm_host->src_clk = NULL;
+		return ret;
+	}
+
+	msm_host->esc_clk_src = clk_get_parent(msm_host->esc_clk);
+	if (!msm_host->esc_clk_src) {
+		ret = -ENODEV;
+		pr_err("%s: can't get esc clock parent. ret=%d\n",
+			__func__, ret);
+		return ret;
+	}
+
+	msm_host->dsi_clk_src = clk_get_parent(msm_host->src_clk);
+	if (!msm_host->dsi_clk_src) {
+		ret = -ENODEV;
+		pr_err("%s: can't get src clock parent. ret=%d\n",
+			__func__, ret);
+	}
+
+	return ret;
+}
+
+int dsi_clk_init_6g_v2(struct msm_dsi_host *msm_host)
+{
+	struct platform_device *pdev = msm_host->pdev;
+	int ret = 0;
+
+	msm_host->byte_intf_clk = msm_clk_get(pdev, "byte_intf");
+	if (IS_ERR(msm_host->byte_intf_clk)) {
+		ret = PTR_ERR(msm_host->byte_intf_clk);
+		pr_err("%s: can't find byte_intf clock. ret=%d\n",
+			__func__, ret);
+	}
+
+	return ret;
+}
+
  static int dsi_clk_init(struct msm_dsi_host *msm_host)
  {
  	struct platform_device *pdev = msm_host->pdev;
@@ -497,7 +545,7 @@ int msm_dsi_runtime_resume(struct device *dev)
  	return dsi_bus_clk_enable(msm_host);
  }
  
-static int dsi_link_clk_enable_6g(struct msm_dsi_host *msm_host)
+int dsi_link_clk_enable_6g(struct msm_dsi_host *msm_host)
  {
  	int ret;
  
@@ -565,7 +613,7 @@ static int dsi_link_clk_enable_6g(struct msm_dsi_host *msm_host)
  	return ret;
  }
  
-static int dsi_link_clk_enable_v2(struct msm_dsi_host *msm_host)
+int dsi_link_clk_enable_v2(struct msm_dsi_host *msm_host)
  {
  	int ret;
  
@@ -643,6 +691,23 @@ static int dsi_link_clk_enable(struct msm_dsi_host *msm_host)
  		return dsi_link_clk_enable_v2(msm_host);
  }
  
+void dsi_link_clk_disable_6g(struct msm_dsi_host *msm_host)
+{
+	clk_disable_unprepare(msm_host->esc_clk);
+	clk_disable_unprepare(msm_host->pixel_clk);
+	if (msm_host->byte_intf_clk)
+		clk_disable_unprepare(msm_host->byte_intf_clk);
+	clk_disable_unprepare(msm_host->byte_clk);
+}
+
+void dsi_link_clk_disable_v2(struct msm_dsi_host *msm_host)
+{
+	clk_disable_unprepare(msm_host->pixel_clk);
+	clk_disable_unprepare(msm_host->src_clk);
+	clk_disable_unprepare(msm_host->esc_clk);
+	clk_disable_unprepare(msm_host->byte_clk);
+}
+
  static void dsi_link_clk_disable(struct msm_dsi_host *msm_host)
  {
  	const struct msm_dsi_cfg_handler *cfg_hnd = msm_host->cfg_hnd;
@@ -661,6 +726,94 @@ static void dsi_link_clk_disable(struct msm_dsi_host *msm_host)
  	}
  }
  
+int dsi_calc_clk_rate_6g(struct msm_dsi_host *msm_host)
+{
+	struct drm_display_mode *mode = msm_host->mode;
+	u8 lanes = msm_host->lanes;
+	u32 bpp = dsi_get_bpp(msm_host->format);
+	u32 pclk_rate;
+
+	if (!mode) {
+		pr_err("%s: mode not set\n", __func__);
+		return -EINVAL;
+	}

As far as I can tell from patch 3/3 the calc_clk_rate() function hook is only
called once and mode_host is guaranteed to be not null. I don't think this check
is needed.

yes should work fine


+	pclk_rate = mode->clock * 1000;
+	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;
+	}
+
+	DBG("pclk=%d, bclk=%d", pclk_rate, msm_host->byte_clk_rate);
+
+	msm_host->esc_clk_rate = clk_get_rate(msm_host->esc_clk);
+
+	return 0;
+}
+
+int dsi_calc_clk_rate_v2(struct msm_dsi_host *msm_host)
+{
+	struct drm_display_mode *mode = msm_host->mode;
+	u8 lanes = msm_host->lanes;
+	u32 bpp = dsi_get_bpp(msm_host->format);
+	u32 pclk_rate;
+	unsigned int esc_mhz, esc_div;
+	unsigned long byte_mhz;
+
+	if (!mode) {
+		pr_err("%s: mode not set\n", __func__);
+		return -EINVAL;
+	}

Or this.

+	pclk_rate = mode->clock * 1000;
+	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;
+	}
+
+	DBG("pclk=%d, bclk=%d", pclk_rate, msm_host->byte_clk_rate);
+
+	msm_host->src_clk_rate = (pclk_rate * bpp) / 8;
+
+	/*
+	 * esc clock is byte clock followed by a 4 bit divider,
+	 * we need to find an escape clock frequency within the
+	 * mipi DSI spec range within the maximum divider limit
+	 * We iterate here between an escape clock frequencey
+	 * between 20 Mhz to 5 Mhz and pick up the first one
+	 * that can be supported by our divider
+	 */
+
+	byte_mhz = msm_host->byte_clk_rate / 1000000;
+
+	for (esc_mhz = 20; esc_mhz >= 5; esc_mhz--) {
+		esc_div = DIV_ROUND_UP(byte_mhz, esc_mhz);
+
+		/*
+		 * TODO: Ideally, we shouldn't know what sort of divider
+		 * is available in mmss_cc, we're just assuming that
+		 * it'll always be a 4 bit divider. Need to come up with
+		 * a better way here.
+		 */
+		if (esc_div >= 1 && esc_div <= 16)
+			break;
+	}
+
+	if (esc_mhz < 5)
+		return -EINVAL;
+
+	msm_host->esc_clk_rate = msm_host->byte_clk_rate / esc_div;
+
+	DBG("esc=%d, src=%d", msm_host->esc_clk_rate,
+		msm_host->src_clk_rate);
+
+	return 0;
+}
+
  static int dsi_calc_clk_rate(struct msm_dsi_host *msm_host)
  {
  	struct drm_display_mode *mode = msm_host->mode;
@@ -1008,6 +1161,49 @@ static void dsi_wait4video_eng_busy(struct msm_dsi_host *msm_host)
  	}
  }
  
+int dsi_tx_buf_alloc_6g(struct msm_dsi_host *msm_host, int size)
+{
+	struct drm_device *dev = msm_host->dev;
+	struct msm_drm_private *priv = dev->dev_private;
+	int ret;
+	uint64_t iova;
+
+	msm_host->tx_gem_obj = msm_gem_new(dev, size, MSM_BO_UNCACHED);
+	if (IS_ERR(msm_host->tx_gem_obj)) {
+		ret = PTR_ERR(msm_host->tx_gem_obj);
+		pr_err("%s: failed to allocate gem, %d\n",
+			__func__, ret);
+		msm_host->tx_gem_obj = NULL;
+		return ret;
+	}
+
+	ret = msm_gem_get_iova(msm_host->tx_gem_obj,
+			priv->kms->aspace, &iova);
+	mutex_unlock(&dev->struct_mutex);

Seems like stuct_mutex unlock wasn't removed when they migrated to the 
new msm_gem_new and msm_gem_get_iova from the previous lock based functions?

+	if (ret) {
+		pr_err("%s: failed to get iova, %d\n", __func__, ret);
+		return ret;
+	}

I'm not sure if you also need to vmap this at some point, but we have a handy
helper function for in-kernel gem objects to automate a bit of this:


we eventually do a msm_gem_get_vaddr so msm_gem_kernel_new seems
like a good fit which will also help to remove one additional helper
function :)

void *msm_gem_kernel_new(struct drm_device *dev, uint32_t size,
                 uint32_t flags, struct msm_gem_address_space *aspace,
		struct drm_gem_object **bo, uint64_t *iova);

Jordan


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