From 0fe08bf9909f02eb487af2cc829f2853ea69bc96 Mon Sep 17 00:00:00 2001 From: Christian Eggers Date: Tue, 2 Nov 2021 21:20:22 +0100 Subject: [PATCH] mtd: rawnand: gpmi: Add ERR007117 protection for nfc_apply_timings commit f53d4c109a666bf1a4883b45d546fba079258717 upstream. gpmi_io clock needs to be gated off when changing the parent/dividers of enfc_clk_root (i.MX6Q/i.MX6UL) respectively qspi2_clk_root (i.MX6SX). Otherwise this rate change can lead to an unresponsive GPMI core which results in DMA timeouts and failed driver probe: [ 4.072318] gpmi-nand 112000.gpmi-nand: DMA timeout, last DMA ... [ 4.370355] gpmi-nand 112000.gpmi-nand: Chip: 0, Error -110 ... [ 4.375988] gpmi-nand 112000.gpmi-nand: Chip: 0, Error -22 [ 4.381524] gpmi-nand 112000.gpmi-nand: Error in ECC-based read: -22 [ 4.387988] gpmi-nand 112000.gpmi-nand: Chip: 0, Error -22 [ 4.393535] gpmi-nand 112000.gpmi-nand: Chip: 0, Error -22 ... Other than stated in i.MX 6 erratum ERR007117, it should be sufficient to gate only gpmi_io because all other bch/nand clocks are derived from different clock roots. The i.MX6 reference manuals state that changing clock muxers can cause glitches but are silent about changing dividers. But tests showed that these glitches can definitely happen on i.MX6ULL. For i.MX7D/8MM in turn, the manual guarantees that no glitches can happen when changing dividers. Co-developed-by: Stefan Riedmueller Signed-off-by: Stefan Riedmueller Signed-off-by: Christian Eggers Cc: stable@vger.kernel.org Acked-by: Han Xu Signed-off-by: Miquel Raynal Link: https://lore.kernel.org/linux-mtd/20211102202022.15551-2-ceggers@arri.de Signed-off-by: Greg Kroah-Hartman --- drivers/mtd/nand/raw/gpmi-nand/gpmi-nand.c | 28 +++++++++++++++++++--- 1 file changed, 25 insertions(+), 3 deletions(-) diff --git a/drivers/mtd/nand/raw/gpmi-nand/gpmi-nand.c b/drivers/mtd/nand/raw/gpmi-nand/gpmi-nand.c index 4d08e4ab5c1b..20450d96377d 100644 --- a/drivers/mtd/nand/raw/gpmi-nand/gpmi-nand.c +++ b/drivers/mtd/nand/raw/gpmi-nand/gpmi-nand.c @@ -713,14 +713,32 @@ static void gpmi_nfc_compute_timings(struct gpmi_nand_data *this, (use_half_period ? BM_GPMI_CTRL1_HALF_PERIOD : 0); } -static void gpmi_nfc_apply_timings(struct gpmi_nand_data *this) +static int gpmi_nfc_apply_timings(struct gpmi_nand_data *this) { struct gpmi_nfc_hardware_timing *hw = &this->hw; struct resources *r = &this->resources; void __iomem *gpmi_regs = r->gpmi_regs; unsigned int dll_wait_time_us; + int ret; + + /* Clock dividers do NOT guarantee a clean clock signal on its output + * during the change of the divide factor on i.MX6Q/UL/SX. On i.MX7/8, + * all clock dividers provide these guarantee. + */ + if (GPMI_IS_MX6Q(this) || GPMI_IS_MX6SX(this)) + clk_disable_unprepare(r->clock[0]); + + ret = clk_set_rate(r->clock[0], hw->clk_rate); + if (ret) { + dev_err(this->dev, "cannot set clock rate to %lu Hz: %d\n", hw->clk_rate, ret); + return ret; + } - clk_set_rate(r->clock[0], hw->clk_rate); + if (GPMI_IS_MX6Q(this) || GPMI_IS_MX6SX(this)) { + ret = clk_prepare_enable(r->clock[0]); + if (ret) + return ret; + } writel(hw->timing0, gpmi_regs + HW_GPMI_TIMING0); writel(hw->timing1, gpmi_regs + HW_GPMI_TIMING1); @@ -739,6 +757,8 @@ static void gpmi_nfc_apply_timings(struct gpmi_nand_data *this) /* Wait for the DLL to settle. */ udelay(dll_wait_time_us); + + return 0; } static int gpmi_setup_interface(struct nand_chip *chip, int chipnr, @@ -2280,7 +2300,9 @@ static int gpmi_nfc_exec_op(struct nand_chip *chip, */ if (this->hw.must_apply_timings) { this->hw.must_apply_timings = false; - gpmi_nfc_apply_timings(this); + ret = gpmi_nfc_apply_timings(this); + if (ret) + return ret; } dev_dbg(this->dev, "%s: %d instructions\n", __func__, op->ninstrs); -- 2.34.1