From a5b8399fb6866be6ca065d8ab5eb7d8775d0ad26 Mon Sep 17 00:00:00 2001 From: Tomi Valkeinen Date: Mon, 22 Oct 2012 16:58:36 +0300 Subject: [PATCH] OMAPDSS: hide dss_select_dispc_clk_source() dss.c currently exposes functions to configure the dispc source clock and lcd source clock. There are configured separately from the output drivers. However, there is no safe way for the output drivers to handle dispc clock, as it's shared between the outputs. Thus, if, say, the DSI driver sets up DSI PLL and configures both the dispc and lcd clock sources to that DSI PLL, the resulting dispc clock could be too low for, say, HDMI. Thus the output drivers should really only be concerned about the lcd clock, which is what the output drivers actually use. There's lot to do to clean up the dss clock handling, but this patch takes one step forward and removes the use of dss_select_dispc_clk_source() from the output drivers. After this patch, the output drivers only configure the lcd source clock. On omap4+ the dispc src clock is never changed from the default PRCM source. On omap3, where the dispc and lcd clocks are actually the same, setting the lcd clock source sets the dispc clock source. Signed-off-by: Tomi Valkeinen --- drivers/video/omap2/dss/dpi.c | 6 ++++-- drivers/video/omap2/dss/dsi.c | 3 --- drivers/video/omap2/dss/dss.c | 8 ++++++-- drivers/video/omap2/dss/dss.h | 1 - drivers/video/omap2/dss/hdmi.c | 8 -------- 5 files changed, 10 insertions(+), 16 deletions(-) diff --git a/drivers/video/omap2/dss/dpi.c b/drivers/video/omap2/dss/dpi.c index 11d64b0..8b9be0d 100644 --- a/drivers/video/omap2/dss/dpi.c +++ b/drivers/video/omap2/dss/dpi.c @@ -77,6 +77,7 @@ static int dpi_set_dsi_clk(struct omap_dss_device *dssdev, unsigned long pck_req, unsigned long *fck, int *lck_div, int *pck_div) { + struct omap_overlay_manager *mgr = dssdev->output->manager; struct dsi_clock_info dsi_cinfo; struct dispc_clock_info dispc_cinfo; int r; @@ -90,7 +91,8 @@ static int dpi_set_dsi_clk(struct omap_dss_device *dssdev, if (r) return r; - dss_select_dispc_clk_source(dssdev->clocks.dispc.dispc_fclk_src); + dss_select_lcd_clk_source(mgr->id, + dssdev->clocks.dispc.channel.lcd_clk_src); dpi.mgr_config.clock_info = dispc_cinfo; @@ -272,7 +274,7 @@ void omapdss_dpi_display_disable(struct omap_dss_device *dssdev) dss_mgr_disable(mgr); if (dpi_use_dsi_pll(dssdev)) { - dss_select_dispc_clk_source(OMAP_DSS_CLK_SRC_FCK); + dss_select_lcd_clk_source(mgr->id, OMAP_DSS_CLK_SRC_FCK); dsi_pll_uninit(dpi.dsidev, true); dsi_runtime_put(dpi.dsidev); } diff --git a/drivers/video/omap2/dss/dsi.c b/drivers/video/omap2/dss/dsi.c index e773f44..d9797da 100644 --- a/drivers/video/omap2/dss/dsi.c +++ b/drivers/video/omap2/dss/dsi.c @@ -4720,7 +4720,6 @@ static int dsi_display_init_dsi(struct omap_dss_device *dssdev) if (r) goto err1; - dss_select_dispc_clk_source(dssdev->clocks.dispc.dispc_fclk_src); dss_select_dsi_clk_source(dsi->module_id, dssdev->clocks.dsi.dsi_fclk_src); dss_select_lcd_clk_source(mgr->id, dssdev->clocks.dispc.channel.lcd_clk_src); @@ -4755,7 +4754,6 @@ static int dsi_display_init_dsi(struct omap_dss_device *dssdev) err3: dsi_cio_uninit(dsidev); err2: - dss_select_dispc_clk_source(OMAP_DSS_CLK_SRC_FCK); dss_select_dsi_clk_source(dsi->module_id, OMAP_DSS_CLK_SRC_FCK); dss_select_lcd_clk_source(mgr->id, OMAP_DSS_CLK_SRC_FCK); @@ -4782,7 +4780,6 @@ static void dsi_display_uninit_dsi(struct omap_dss_device *dssdev, dsi_vc_enable(dsidev, 2, 0); dsi_vc_enable(dsidev, 3, 0); - dss_select_dispc_clk_source(OMAP_DSS_CLK_SRC_FCK); dss_select_dsi_clk_source(dsi->module_id, OMAP_DSS_CLK_SRC_FCK); dss_select_lcd_clk_source(mgr->id, OMAP_DSS_CLK_SRC_FCK); dsi_cio_uninit(dsidev); diff --git a/drivers/video/omap2/dss/dss.c b/drivers/video/omap2/dss/dss.c index 844bb1f..df3d89a 100644 --- a/drivers/video/omap2/dss/dss.c +++ b/drivers/video/omap2/dss/dss.c @@ -304,7 +304,7 @@ static void dss_dump_regs(struct seq_file *s) #undef DUMPREG } -void dss_select_dispc_clk_source(enum omap_dss_clk_source clk_src) +static void dss_select_dispc_clk_source(enum omap_dss_clk_source clk_src) { struct platform_device *dsidev; int b; @@ -375,8 +375,10 @@ void dss_select_lcd_clk_source(enum omap_channel channel, struct platform_device *dsidev; int b, ix, pos; - if (!dss_has_feature(FEAT_LCD_CLK_SRC)) + if (!dss_has_feature(FEAT_LCD_CLK_SRC)) { + dss_select_dispc_clk_source(clk_src); return; + } switch (clk_src) { case OMAP_DSS_CLK_SRC_FCK: @@ -935,6 +937,8 @@ static int __init omap_dsshw_probe(struct platform_device *pdev) /* Select DPLL */ REG_FLD_MOD(DSS_CONTROL, 0, 0, 0); + dss_select_dispc_clk_source(OMAP_DSS_CLK_SRC_FCK); + #ifdef CONFIG_OMAP2_DSS_VENC REG_FLD_MOD(DSS_CONTROL, 1, 4, 4); /* venc dac demen */ REG_FLD_MOD(DSS_CONTROL, 1, 3, 3); /* venc clock 4x enable */ diff --git a/drivers/video/omap2/dss/dss.h b/drivers/video/omap2/dss/dss.h index e637f8d..84a7f6a 100644 --- a/drivers/video/omap2/dss/dss.h +++ b/drivers/video/omap2/dss/dss.h @@ -283,7 +283,6 @@ void dss_sdi_init(int datapairs); int dss_sdi_enable(void); void dss_sdi_disable(void); -void dss_select_dispc_clk_source(enum omap_dss_clk_source clk_src); void dss_select_dsi_clk_source(int dsi_module, enum omap_dss_clk_source clk_src); void dss_select_lcd_clk_source(enum omap_channel channel, diff --git a/drivers/video/omap2/dss/hdmi.c b/drivers/video/omap2/dss/hdmi.c index 2aada9d..a43ac3f 100644 --- a/drivers/video/omap2/dss/hdmi.c +++ b/drivers/video/omap2/dss/hdmi.c @@ -528,14 +528,6 @@ static int hdmi_power_on_core(struct omap_dss_device *dssdev) /* Make selection of HDMI in DSS */ dss_select_hdmi_venc_clk_source(DSS_HDMI_M_PCLK); - /* Select the dispc clock source as PRCM clock, to ensure that it is not - * DSI PLL source as the clock selected by DSI PLL might not be - * sufficient for the resolution selected / that can be changed - * dynamically by user. This can be moved to single location , say - * Boardfile. - */ - dss_select_dispc_clk_source(dssdev->clocks.dispc.dispc_fclk_src); - return 0; err_runtime_get: -- 2.7.4