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spi: rockchip: set higher io driver when sclk higher than 24MHz

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Fixes: f27d8c9975 ("spi: rockchip: get pinctrl for lookup pinctrl state")
Fixes: 87dbea63d5 ("spi: rockchip: set higher io driver when sclk higher than 24MHz")
Change-Id: I963c92eab7f7bff0b32e2ac262aa79f0667f39ee
Signed-off-by: Huibin Hong <huibin.hong@rock-chips.com>
Signed-off-by: Jianqun Xu <jay.xu@rock-chips.com>
Signed-off-by: Jon Lin <jon.lin@rock-chips.com>
This commit is contained in:
Jon Lin
2021-06-17 19:55:33 +08:00
committed by Tao Huang
parent 4239fdd85b
commit 40145ca4e0
1 changed files with 27 additions and 0 deletions
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27
drivers/spi/spi-rockchip.c
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@@ -10,6 +10,7 @@
#include <linux/module.h>
#include <linux/of.h>
#include <linux/pinctrl/consumer.h>
#include <linux/pinctrl/devinfo.h>
#include <linux/platform_device.h>
#include <linux/spi/spi.h>
#include <linux/pm_runtime.h>
@@ -149,6 +150,8 @@
/* sclk_out: spi master internal logic in rk3x can support 50Mhz */
#define MAX_SCLK_OUT 50000000U
/* max sclk of driver strength 4mA */
#define IO_DRIVER_4MA_MAX_SCLK_OUT 24000000U
/*
* SPI_CTRLR1 is 16-bits, so we should support lengths of 0xffff + 1. However,
@@ -187,6 +190,7 @@ struct rockchip_spi {
bool cs_asserted[ROCKCHIP_SPI_MAX_CS_NUM];
struct pinctrl_state *high_speed_state;
bool slave_abort;
};
@@ -529,6 +533,19 @@ static void rockchip_spi_config(struct rockchip_spi *rs,
dmacr |= RF_DMA_EN;
}
/*
* If speed is larger than IO_DRIVER_4MA_MAX_SCLK_OUT,
* set higher driver strength.
*/
if (rs->high_speed_state) {
if (rs->freq > IO_DRIVER_4MA_MAX_SCLK_OUT)
pinctrl_select_state(rs->dev->pins->p,
rs->high_speed_state);
else
pinctrl_select_state(rs->dev->pins->p,
rs->dev->pins->default_state);
}
writel_relaxed(cr0, rs->regs + ROCKCHIP_SPI_CTRLR0);
writel_relaxed(cr1, rs->regs + ROCKCHIP_SPI_CTRLR1);
@@ -625,6 +642,7 @@ static int rockchip_spi_probe(struct platform_device *pdev)
struct device_node *np = pdev->dev.of_node;
u32 rsd_nsecs;
bool slave_mode;
struct pinctrl *pinctrl = NULL;
slave_mode = of_property_read_bool(np, "spi-slave");
@@ -772,6 +790,15 @@ static int rockchip_spi_probe(struct platform_device *pdev)
ctlr->can_dma = rockchip_spi_can_dma;
}
pinctrl = devm_pinctrl_get(&pdev->dev);
if (!IS_ERR(pinctrl)) {
rs->high_speed_state = pinctrl_lookup_state(pinctrl, "high_speed");
if (IS_ERR_OR_NULL(rs->high_speed_state)) {
dev_warn(&pdev->dev, "no high_speed pinctrl state\n");
rs->high_speed_state = NULL;
}
}
ret = devm_spi_register_controller(&pdev->dev, ctlr);
if (ret < 0) {
dev_err(&pdev->dev, "Failed to register controller\n");