This is a note to let you know that I've just added the patch titled
Revert "mmc: meson-gx: include tx phase in the tuning process"
to the 4.15-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...
The filename of the patch is: revert-mmc-meson-gx-include-tx-phase-in-the-tuning-process.patch and it can be found in the queue-4.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree, please let stable@vger.kernel.org know about it.
From fe0e58048f005fdce315eb4d185e5c160be4ac01 Mon Sep 17 00:00:00 2001
From: Jerome Brunet jbrunet@baylibre.com Date: Mon, 12 Feb 2018 14:13:59 +0100 Subject: Revert "mmc: meson-gx: include tx phase in the tuning process"
From: Jerome Brunet jbrunet@baylibre.com
commit fe0e58048f005fdce315eb4d185e5c160be4ac01 upstream.
This reverts commit 0a44697627d17a66d7dc98f17aeca07ca79c5c20.
This commit was initially intended to fix problems with hs200 and hs400 on some boards, mainly the odroid-c2. The OC2 (Rev 0.2) I have performs well in this modes, so I could not confirm these issues.
We've had several reports about the issues being still present on (some) OC2, so apparently, this change does not do what it was supposed to do. Maybe the eMMC signal quality is on the edge on the board. This may explain the variability we see in term of stability, but this is just a guess. Lowering the max_frequency to 100Mhz seems to do trick for those affected by the issue
Worse, the commit created new issues (CRC errors and hangs) on other boards, such as the kvim 1 and 2, the p200 or the libretech-cc.
According to amlogic, the Tx phase should not be tuned and left in its default configuration, so it is best to just revert the commit.
Fixes: 0a44697627d1 ("mmc: meson-gx: include tx phase in the tuning process") Cc: stable@vger.kernel.org # 4.14+ Signed-off-by: Jerome Brunet jbrunet@baylibre.com Signed-off-by: Ulf Hansson ulf.hansson@linaro.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/mmc/host/meson-gx-mmc.c | 19 +------------------ 1 file changed, 1 insertion(+), 18 deletions(-)
--- a/drivers/mmc/host/meson-gx-mmc.c +++ b/drivers/mmc/host/meson-gx-mmc.c @@ -716,22 +716,6 @@ static int meson_mmc_clk_phase_tuning(st static int meson_mmc_execute_tuning(struct mmc_host *mmc, u32 opcode) { struct meson_host *host = mmc_priv(mmc); - int ret; - - /* - * If this is the initial tuning, try to get a sane Rx starting - * phase before doing the actual tuning. - */ - if (!mmc->doing_retune) { - ret = meson_mmc_clk_phase_tuning(mmc, opcode, host->rx_clk); - - if (ret) - return ret; - } - - ret = meson_mmc_clk_phase_tuning(mmc, opcode, host->tx_clk); - if (ret) - return ret;
return meson_mmc_clk_phase_tuning(mmc, opcode, host->rx_clk); } @@ -762,9 +746,8 @@ static void meson_mmc_set_ios(struct mmc if (!IS_ERR(mmc->supply.vmmc)) mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, ios->vdd);
- /* Reset phases */ + /* Reset rx phase */ clk_set_phase(host->rx_clk, 0); - clk_set_phase(host->tx_clk, 270);
break;
Patches currently in stable-queue which might be from jbrunet@baylibre.com are
queue-4.15/revert-mmc-meson-gx-include-tx-phase-in-the-tuning-process.patch