5.15-stable review patch. If anyone has any objections, please let me know.
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From: Ziyang Huang hzyitc@outlook.com
commit 8c124d998ea0c9022e247b11ac51f86ec8afa0e1 upstream.
Commit 4bc31edebde5 ("mmc: core: Set HS clock speed before sending HS CMD13") set HS clock (52MHz) before switching to HS mode. For this freq, FCLK_DIV5 will be selected and div value is 10 (reg value is 9). Then we set rx_clk_phase to 11 or 15 which is out of range and make hardware frozen. After we send command request, no irq will be interrupted and the mmc driver will keep to wait for request finished, even durning rebooting.
So let's set it to Phase 90 which should work in most cases. Then let meson_mx_sdhc_execute_tuning() to find the accurate value for data transfer.
If this doesn't work, maybe need to define a factor in dts.
Fixes: e4bf1b0970ef ("mmc: host: meson-mx-sdhc: new driver for the Amlogic Meson SDHC host") Signed-off-by: Ziyang Huang hzyitc@outlook.com Tested-by: Anand Moon linux.amoon@gmail.com Cc: stable@vger.kernel.org Link: https://lore.kernel.org/r/TYZPR01MB5556A3E71554A2EC08597EA4C9CDA@TYZPR01MB55... Signed-off-by: Ulf Hansson ulf.hansson@linaro.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/mmc/host/meson-mx-sdhc-mmc.c | 26 +++++--------------------- 1 file changed, 5 insertions(+), 21 deletions(-)
--- a/drivers/mmc/host/meson-mx-sdhc-mmc.c +++ b/drivers/mmc/host/meson-mx-sdhc-mmc.c @@ -269,7 +269,7 @@ static int meson_mx_sdhc_enable_clks(str static int meson_mx_sdhc_set_clk(struct mmc_host *mmc, struct mmc_ios *ios) { struct meson_mx_sdhc_host *host = mmc_priv(mmc); - u32 rx_clk_phase; + u32 val, rx_clk_phase; int ret;
meson_mx_sdhc_disable_clks(mmc); @@ -290,27 +290,11 @@ static int meson_mx_sdhc_set_clk(struct mmc->actual_clock = clk_get_rate(host->sd_clk);
/* - * according to Amlogic the following latching points are - * selected with empirical values, there is no (known) formula - * to calculate these. + * Phase 90 should work in most cases. For data transmission, + * meson_mx_sdhc_execute_tuning() will find a accurate value */ - if (mmc->actual_clock > 100000000) { - rx_clk_phase = 1; - } else if (mmc->actual_clock > 45000000) { - if (ios->signal_voltage == MMC_SIGNAL_VOLTAGE_330) - rx_clk_phase = 15; - else - rx_clk_phase = 11; - } else if (mmc->actual_clock >= 25000000) { - rx_clk_phase = 15; - } else if (mmc->actual_clock > 5000000) { - rx_clk_phase = 23; - } else if (mmc->actual_clock > 1000000) { - rx_clk_phase = 55; - } else { - rx_clk_phase = 1061; - } - + regmap_read(host->regmap, MESON_SDHC_CLKC, &val); + rx_clk_phase = FIELD_GET(MESON_SDHC_CLKC_CLK_DIV, val) / 4; regmap_update_bits(host->regmap, MESON_SDHC_CLK2, MESON_SDHC_CLK2_RX_CLK_PHASE, FIELD_PREP(MESON_SDHC_CLK2_RX_CLK_PHASE,