drm/omap: increase DSS5 max tv pclk to 192MHz

DSS5's maximum tv pclk rate (i.e. HDMI) is set to 186MHz, which comes
from the TRM (DPLL_HDMI_CLK1 frequency must be lower than 186 MHz). To
support DRA76's wide screen HDMI feature, we need to increase this
maximum rate.

Testing shows that the PLL seems to work fine even with ~240MHz clocks,
and even the HDMI output at that clock is stable enough for monitors to
show a picture. This holds true for all DRA7 and AM5 SoCs (and probably
also for OMAP5).

However, the highest we can go without big refactoring to the clocking
code is 192MHz, as that is the DSS func clock we get from the PRCM. So,
increase the max HDMI pixel clock to 192MHz for now, to allow some more
2k+ modes to work.

This patch never had a clear confirmation from HW people, but this
change stayed on production trees for multiple years without any report
on an eventual breakage.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
Reviewed-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20211012133939.2145462-1-narmstrong@baylibre.com

diff --git a/drivers/gpu/drm/omapdrm/dss/dispc.c b/drivers/gpu/drm/omapdrm/dss/dispc.c
index 24ba1d0831de7320cb6dfc97b293ea62e3839286..b440147ae28b7f86a841251e1e284f94946fc74c 100644 (file)
--- a/drivers/gpu/drm/omapdrm/dss/dispc.c
+++ b/drivers/gpu/drm/omapdrm/dss/dispc.c
@@ -4458,7 +4458,7 @@ static const struct dispc_features omap54xx_dispc_feats = {
        .mgr_width_max          =       4096,
        .mgr_height_max         =       4096,
        .max_lcd_pclk           =       170000000,
-       .max_tv_pclk            =       186000000,
+       .max_tv_pclk            =       192000000,
        .max_downscale          =       4,
        .max_line_width         =       2048,
        .min_pcd                =       1,