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fbdev: mxsfb: implement FB_PRE_INIT_FB option 

The FB_PRE_INIT_FB option keeps the kernel from reinitializing the display
and prevents flickering during the transition from a bootloader splash
screen to the kernel logo screen.

Make this option available for the mxsfb driver.

Signed-off-by: Melchior Franz <melchior.franz@ginzinger.com>
Signed-off-by: Martin Kepplinger <martin.kepplinger@ginzinger.com>
Signed-off-by: Manfred Schlaegl <manfred.schlaegl@ginzinger.com>
Cc: Shawn Guo <shawnguo@kernel.org>
Cc: Sascha Hauer <s.hauer@pengutronix.de>
Cc: Pengutronix Kernel Team <kernel@pengutronix.de>
Cc: Fabio Estevam <festevam@gmail.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
hifive-unleashed-5.2
Melchior Franz 2019-04-01 17:46:53 +02:00 committed by Bartlomiej Zolnierkiewicz
parent df76861019
commit 767f17a70e
2 changed files with 13 additions and 1 deletions
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2
drivers/video/fbdev/Kconfig
View File

@ -2183,7 +2183,7 @@ config FB_EP93XX
config FB_PRE_INIT_FB
bool "Don't reinitialize, use bootloader's GDC/Display configuration"
depends on FB && FB_MB862XX_LIME
depends on FB && (FB_MB862XX_LIME || FB_MXS)
---help---
Select this option if display contents should be inherited as set by
the bootloader.

12
drivers/video/fbdev/mxsfb.c
View File

@ -181,6 +181,7 @@ struct mxsfb_info {
const struct mxsfb_devdata *devdata;
u32 sync;
struct regulator *reg_lcd;
int pre_init;
};
#define mxsfb_is_v3(host) (host->devdata->ipversion == 3)
@ -419,6 +420,12 @@ static int mxsfb_set_par(struct fb_info *fb_info)
fb_info->fix.line_length = line_size;
if (host->pre_init) {
mxsfb_enable_controller(fb_info);
host->pre_init = 0;
return 0;
}
/*
* It seems, you can't re-program the controller if it is still running.
* This may lead into shifted pictures (FIFO issue?).
@ -931,6 +938,10 @@ static int mxsfb_probe(struct platform_device *pdev)
if (IS_ERR(host->reg_lcd))
host->reg_lcd = NULL;
#if defined(CONFIG_FB_PRE_INIT_FB)
host->pre_init = 1;
#endif
fb_info->pseudo_palette = devm_kcalloc(&pdev->dev, 16, sizeof(u32),
GFP_KERNEL);
if (!fb_info->pseudo_palette) {
@ -963,6 +974,7 @@ static int mxsfb_probe(struct platform_device *pdev)
mxsfb_enable_controller(fb_info);
}
host->pre_init = 0;
dev_info(&pdev->dev, "initialized\n");
return 0;