diff options
| author | Marek Vasut <[email protected]> | 2021-06-21 00:49:46 +0200 |
|---|---|---|
| committer | Sam Ravnborg <[email protected]> | 2021-07-27 21:15:24 +0200 |
| commit | 5e23c98178eb1a2cdb7c4fee9a39baf8cabf282d (patch) | |
| tree | dfb28c5011c3fa892c42097ad1e6d7bcf7328d0c | |
| parent | b776b0f00f246d093c595bac4453c6e51541d5c5 (diff) | |
drm: mxsfb: Clear FIFO_CLEAR bit
Make sure the FIFO_CLEAR bit is latched in when configuring the
controller, so that the FIFO is really cleared. And then clear
the FIFO_CLEAR bit, since it is not self-clearing.
Fixes: 45d59d704080 ("drm: Add new driver for MXSFB controller")
Signed-off-by: Marek Vasut <[email protected]>
Cc: Daniel Abrecht <[email protected]>
Cc: Emil Velikov <[email protected]>
Cc: Laurent Pinchart <[email protected]>
Cc: Lucas Stach <[email protected]>
Cc: Stefan Agner <[email protected]>
Reviewed-by: Jagan Teki <[email protected]>
Tested-by: Jagan Teki <[email protected]> # i.Core MX8MM
Acked-by: Lucas Stach <[email protected]>
Signed-off-by: Sam Ravnborg <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]
| -rw-r--r-- | drivers/gpu/drm/mxsfb/mxsfb_kms.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/gpu/drm/mxsfb/mxsfb_kms.c b/drivers/gpu/drm/mxsfb/mxsfb_kms.c index 4501deb48e6b..89dd618d78f3 100644 --- a/drivers/gpu/drm/mxsfb/mxsfb_kms.c +++ b/drivers/gpu/drm/mxsfb/mxsfb_kms.c @@ -241,6 +241,9 @@ static void mxsfb_crtc_mode_set_nofb(struct mxsfb_drm_private *mxsfb, /* Clear the FIFOs */ writel(CTRL1_FIFO_CLEAR, mxsfb->base + LCDC_CTRL1 + REG_SET); + readl(mxsfb->base + LCDC_CTRL1); + writel(CTRL1_FIFO_CLEAR, mxsfb->base + LCDC_CTRL1 + REG_CLR); + readl(mxsfb->base + LCDC_CTRL1); if (mxsfb->devdata->has_overlay) writel(0, mxsfb->base + LCDC_AS_CTRL); |