4.14-stable review patch. If anyone has any objections, please let me know.
------------------ From: Sergei Shtylyov <[email protected]> [ Upstream commit 8525d04ba8a6a9ecfa4bd619c988ca873a5fc2a4 ] According to the latest revision 2.00 of the R-Car Gen2 manual, the LVDS and the bias circuit must be enabled after the LVDS I/O pins are enabled, not before. Fix the Gen2 LVDS startup sequence accordingly. While at it, also fix the comment preceding the first LVDCR0 write that still talks about hardcoding the LVDS mode 0. Fixes: 90374b5c25c9 ("drm/rcar-du: Add internal LVDS encoder support") Signed-off-by: Sergei Shtylyov <[email protected]> Reviewed-by: Laurent Pinchart <[email protected]> Tested-by: Laurent Pinchart <[email protected]> Signed-off-by: Laurent Pinchart <[email protected]> Signed-off-by: Sasha Levin <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]> --- drivers/gpu/drm/rcar-du/rcar_du_lvdsenc.c | 11 ++++++----- 1 file changed, 6 insertions(+), 5 deletions(-) --- a/drivers/gpu/drm/rcar-du/rcar_du_lvdsenc.c +++ b/drivers/gpu/drm/rcar-du/rcar_du_lvdsenc.c @@ -59,11 +59,8 @@ static void rcar_du_lvdsenc_start_gen2(s rcar_lvds_write(lvds, LVDPLLCR, pllcr); - /* - * Select the input, hardcode mode 0, enable LVDS operation and turn - * bias circuitry on. - */ - lvdcr0 = (lvds->mode << LVDCR0_LVMD_SHIFT) | LVDCR0_BEN | LVDCR0_LVEN; + /* Select the input and set the LVDS mode. */ + lvdcr0 = lvds->mode << LVDCR0_LVMD_SHIFT; if (rcrtc->index == 2) lvdcr0 |= LVDCR0_DUSEL; rcar_lvds_write(lvds, LVDCR0, lvdcr0); @@ -74,6 +71,10 @@ static void rcar_du_lvdsenc_start_gen2(s LVDCR1_CHSTBY_GEN2(1) | LVDCR1_CHSTBY_GEN2(0) | LVDCR1_CLKSTBY_GEN2); + /* Enable LVDS operation and turn bias circuitry on. */ + lvdcr0 |= LVDCR0_BEN | LVDCR0_LVEN; + rcar_lvds_write(lvds, LVDCR0, lvdcr0); + /* * Turn the PLL on, wait for the startup delay, and turn the output * on.
