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arch/arm/src/am335x/am335x_lcdc.c: LCDC driver is now code complete and ready for testing.

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This commit is contained in:
Gregory Nutt 2019-07-08 15:32:55 -06:00
parent 6991ac37fe
commit e5eee68d0d
1 changed files with 45 additions and 17 deletions
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62
arch/arm/src/am335x/am335x_lcdc.c
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@ -111,6 +111,9 @@ static int am335x_setcursor(FAR struct fb_vtable_s *vtable,
static int am335x_lcd_interrupt(int irq, void *context, void *arg);
static uint32_t am335x_lcd_divisor(uint32_t reference, uint32_t frequency);
static int am335x_set_refclk(uint32_t frequency);
static int am335x_get_refclk(uint32_t *frequency);
static int am335x_lcdc_enableclk(void);
/****************************************************************************
* Private Data
@ -461,6 +464,35 @@ static int am335x_get_refclk(uint32_t *frequency)
return OK;
}
/****************************************************************************
* Name: am335x_lcdc_enableclk
****************************************************************************/
static int am335x_lcdc_enableclk(void)
{
/* Set MODULEMODE to ENABLE(2) */
putreg32(AM335X_CM_PER_LCDC_CLKCTRL, CM_WKUP_CLKCTRL_MODULEMODE_ENABLE);
/* Wait for MODULEMODE to reflect that it is enabled */
while ((getreg32(AM335X_CM_PER_LCDC_CLKCTRL) & CM_WKUP_CLKCTRL_MODULEMODE_MASK)
!= CM_WKUP_CLKCTRL_MODULEMODE_ENABLE)
{
up_udelay(10);
}
/* Wait for IDLEST to become fully functional */
while ((getreg32(AM335X_CM_PER_LCDC_CLKCTRL) & CM_WKUP_CLKCTRL_IDLEST_MASK)
!= CM_WKUP_CLKCTRL_IDLEST_FUNC)
{
up_udelay(10);
}
return OK;
}
/****************************************************************************
* Public Functions
****************************************************************************/
@ -600,22 +632,20 @@ int am335x_lcd_initialize(FAR const struct am335x_panel_info_s *panel)
lcderr("ERROR: Failed to attach LCDC interrupt.");
}
/* Enable clocking to the LCD peripheral. Set the initial reference clock
* to twice the VGA pixel clock for now.
*/
/* Set the initial reference clock to twice the VGA pixel clock for now. */
(void)am335x_set_refclk(2 * 25175000);
/* REVISIT: Need to (1) set the initial pixel clock and (2) set
* LCDC related bits in PRCM to enable clocking to the LCDC.
* Reference: http://fxr.watson.org/fxr/source/arm/ti/am335x/am335x_prcm.c#L819
*/
/* Enable clocking to the LCD peripheral. */
lcdinfo("Enable clocking to the LCD controller\n");
#if 0 /* FIXEME */
ti_prcm_clk_enable(LCDC_CLK);
#endif
#warning Missing logic
ret = am335x_lcdc_enableclk();
if (ret < 0)
{
lcderr("ERROR: Failed to enable clocking\n");
return ret;
}
/* Adjust reference clock to get double of requested pixel clock frequency
* HDMI/DVI displays are very sensitive to error in frequency value.
@ -624,7 +654,7 @@ int am335x_lcd_initialize(FAR const struct am335x_panel_info_s *panel)
ret = am335x_set_refclk(2 * priv->panel.pixclk);
if (ret < 0)
{
lcderr("ERROR: Can't set source frequency\n");
lcderr("ERROR: Failed to set source frequency\n");
return ret;
}
@ -633,7 +663,7 @@ int am335x_lcd_initialize(FAR const struct am335x_panel_info_s *panel)
ret = am335x_get_refclk(&reffreq);
if (ret < 0)
{
lcderr("ERROR: Can't get reference frequency\n");
lcderr("ERROR: Failed to get reference frequency\n");
return ret;
}
@ -879,11 +909,9 @@ void up_fbuninitialize(int display)
am335x_backlight(false);
#endif
/* Disable the LCD controller */
#warning Missing Logic
/* Reset/Disable the LCD controller */
/* Disable clocking to the LCD peripheral */
#warning Missing Logic
/* Detach and disable the LCDC interrupt */
}
/****************************************************************************