diff options
Diffstat (limited to 'package/boot/uboot-mediatek/patches/000-mtk-11-serial-serial-mtk-rewrite-the-setbrg-function.patch')
| -rw-r--r-- | package/boot/uboot-mediatek/patches/000-mtk-11-serial-serial-mtk-rewrite-the-setbrg-function.patch | 141 |
1 files changed, 0 insertions, 141 deletions
diff --git a/package/boot/uboot-mediatek/patches/000-mtk-11-serial-serial-mtk-rewrite-the-setbrg-function.patch b/package/boot/uboot-mediatek/patches/000-mtk-11-serial-serial-mtk-rewrite-the-setbrg-function.patch deleted file mode 100644 index 2ce7733314..0000000000 --- a/package/boot/uboot-mediatek/patches/000-mtk-11-serial-serial-mtk-rewrite-the-setbrg-function.patch +++ /dev/null @@ -1,141 +0,0 @@ -From d8bde59186dafdea5bbe8d29d3a6ae7cac98e9d0 Mon Sep 17 00:00:00 2001 -From: Weijie Gao <weijie.gao@mediatek.com> -Date: Mon, 25 Jan 2021 11:19:08 +0800 -Subject: [PATCH 11/21] serial: serial-mtk: rewrite the setbrg function - -Currently the setbrg logic of serial-mtk is messy, and should be rewritten. -Also an option is added to make it possible to use highspeed=3 mode for all -bauds. - -The new logic is: -1. If baud clock > 12MHz - a) If baud <= 115200, highspeed=0 mode will be used (ns16550 compatible) - b) If baud <= 576000, highspeed=2 mode will be used - c) any baud > 576000, highspeed=3 mode will be used -2. If baud clock <= 12MHz - Always uses highspeed=3 mode - a) If baud <= 115200, calculates the divisor using DIV_ROUND_CLOSEST - b) any baud > 115200, the same as 1. c) - -Signed-off-by: Weijie Gao <weijie.gao@mediatek.com> ---- - drivers/serial/serial_mtk.c | 74 +++++++++++++++++-------------------- - 1 file changed, 33 insertions(+), 41 deletions(-) - ---- a/drivers/serial/serial_mtk.c -+++ b/drivers/serial/serial_mtk.c -@@ -73,74 +73,64 @@ struct mtk_serial_regs { - struct mtk_serial_priv { - struct mtk_serial_regs __iomem *regs; - u32 clock; -+ bool force_highspeed; - }; - - static void _mtk_serial_setbrg(struct mtk_serial_priv *priv, int baud) - { -- bool support_clk12m_baud115200; -- u32 quot, samplecount, realbaud; -+ u32 quot, realbaud, samplecount = 1; - -- if ((baud <= 115200) && (priv->clock == 12000000)) -- support_clk12m_baud115200 = true; -- else -- support_clk12m_baud115200 = false; -+ /* Special case for low baud clock */ -+ if ((baud <= 115200) && (priv->clock == 12000000)) { -+ writel(3, &priv->regs->highspeed); -+ -+ quot = DIV_ROUND_CLOSEST(priv->clock, 256 * baud); -+ if (quot == 0) -+ quot = 1; -+ -+ samplecount = DIV_ROUND_CLOSEST(priv->clock, quot * baud); -+ -+ realbaud = priv->clock / samplecount / quot; -+ if ((realbaud > BAUD_ALLOW_MAX(baud)) || -+ (realbaud < BAUD_ALLOW_MIX(baud))) { -+ pr_info("baud %d can't be handled\n", baud); -+ } -+ -+ goto set_baud; -+ } -+ -+ if (priv->force_highspeed) -+ goto use_hs3; - - if (baud <= 115200) { - writel(0, &priv->regs->highspeed); - quot = DIV_ROUND_CLOSEST(priv->clock, 16 * baud); -- -- if (support_clk12m_baud115200) { -- writel(3, &priv->regs->highspeed); -- quot = DIV_ROUND_CLOSEST(priv->clock, 256 * baud); -- if (quot == 0) -- quot = 1; -- -- samplecount = DIV_ROUND_CLOSEST(priv->clock, -- quot * baud); -- if (samplecount != 0) { -- realbaud = priv->clock / samplecount / quot; -- if ((realbaud > BAUD_ALLOW_MAX(baud)) || -- (realbaud < BAUD_ALLOW_MIX(baud))) { -- pr_info("baud %d can't be handled\n", -- baud); -- } -- } else { -- pr_info("samplecount is 0\n"); -- } -- } - } else if (baud <= 576000) { - writel(2, &priv->regs->highspeed); - - /* Set to next lower baudrate supported */ - if ((baud == 500000) || (baud == 576000)) - baud = 460800; -+ - quot = DIV_ROUND_UP(priv->clock, 4 * baud); - } else { -+use_hs3: - writel(3, &priv->regs->highspeed); -+ - quot = DIV_ROUND_UP(priv->clock, 256 * baud); -+ samplecount = DIV_ROUND_CLOSEST(priv->clock, quot * baud); - } - -+set_baud: - /* set divisor */ - writel(UART_LCR_WLS_8 | UART_LCR_DLAB, &priv->regs->lcr); - writel(quot & 0xff, &priv->regs->dll); - writel((quot >> 8) & 0xff, &priv->regs->dlm); - writel(UART_LCR_WLS_8, &priv->regs->lcr); - -- if (baud > 460800) { -- u32 tmp; -- -- tmp = DIV_ROUND_CLOSEST(priv->clock, quot * baud); -- writel(tmp - 1, &priv->regs->sample_count); -- writel((tmp - 2) >> 1, &priv->regs->sample_point); -- } else { -- writel(0, &priv->regs->sample_count); -- writel(0xff, &priv->regs->sample_point); -- } -- -- if (support_clk12m_baud115200) { -- writel(samplecount - 1, &priv->regs->sample_count); -- writel((samplecount - 2) >> 1, &priv->regs->sample_point); -- } -+ /* set highspeed mode sample count & point */ -+ writel(samplecount - 1, &priv->regs->sample_count); -+ writel((samplecount - 2) >> 1, &priv->regs->sample_point); - } - - static int _mtk_serial_putc(struct mtk_serial_priv *priv, const char ch) -@@ -248,6 +238,8 @@ static int mtk_serial_of_to_plat(struct - return -EINVAL; - } - -+ priv->force_highspeed = dev_read_bool(dev, "mediatek,force-highspeed"); -+ - return 0; - } - |