From: Marek Vasut Date: Tue, 25 Jun 2024 12:02:33 +0000 (+0200) Subject: drm/bridge: tc358767: Set LSCLK divider for SYSCLK to 1 X-Git-Tag: v6.11-rc1~141^2~15^2~17 X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=9c433c87e81c2dfc005b72b9fe822b065ffa044e;p=thirdparty%2Flinux.git drm/bridge: tc358767: Set LSCLK divider for SYSCLK to 1 The only information in the datasheet regarding this divider is a note in SYS_PLLPARAM register documentation which states that when LSCLK is 270 MHz, LSCLK_DIV should be 1. What should LSCLK_DIV be set to when LSCLK is 162 MHz (for DP 1.62G mode) is unclear, but empirical test confirms using LSCLK_DIV 1 has no adverse effects either. In the worst case, the internal TC358767 clock would run faster. Reviewed-by: Alexander Stein Signed-off-by: Marek Vasut Signed-off-by: Robert Foss Link: https://patchwork.freedesktop.org/patch/msgid/20240625120334.145320-4-marex@denx.de --- diff --git a/drivers/gpu/drm/bridge/tc358767.c b/drivers/gpu/drm/bridge/tc358767.c index 0338b7a7bbefb..610df536a6edf 100644 --- a/drivers/gpu/drm/bridge/tc358767.c +++ b/drivers/gpu/drm/bridge/tc358767.c @@ -738,7 +738,7 @@ static int tc_stream_clock_calc(struct tc_data *tc) static int tc_set_syspllparam(struct tc_data *tc) { unsigned long rate; - u32 pllparam = SYSCLK_SEL_LSCLK | LSCLK_DIV_2; + u32 pllparam = SYSCLK_SEL_LSCLK | LSCLK_DIV_1; rate = clk_get_rate(tc->refclk); switch (rate) {