From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1161410AbcFMShf (ORCPT ); Mon, 13 Jun 2016 14:37:35 -0400 Received: from shadbolt.e.decadent.org.uk ([88.96.1.126]:43451 "EHLO shadbolt.e.decadent.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753617AbcFMSh1 (ORCPT ); Mon, 13 Jun 2016 14:37:27 -0400 Content-Type: text/plain; charset="UTF-8" Content-Disposition: inline Content-Transfer-Encoding: 8bit MIME-Version: 1.0 From: Ben Hutchings To: linux-kernel@vger.kernel.org, stable@vger.kernel.org CC: akpm@linux-foundation.org, "Ben Hutchings" , "Mark Brown" Date: Mon, 13 Jun 2016 19:36:37 +0100 Message-ID: X-Mailer: LinuxStableQueue (scripts by bwh) Subject: [PATCH 3.16 017/114] spi: spi-ti-qspi: Fix FLEN and WLEN settings if bits_per_word is overridden In-Reply-To: X-SA-Exim-Connect-IP: 2a02:8011:400e:2:6f00:88c8:c921:d332 X-SA-Exim-Mail-From: ben@decadent.org.uk X-SA-Exim-Scanned: No (on shadbolt.decadent.org.uk); SAEximRunCond expanded to false Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 3.16.36-rc1 review patch. If anyone has any objections, please let me know. ------------------ From: Ben Hutchings commit ea1b60fb085839a9544cb3a0069992991beabb7f upstream. Each transfer can specify 8, 16 or 32 bits per word independently of the default for the device being addressed. However, currently we calculate the number of words in the frame assuming that the word size is the device default. If multiple transfers in the same message have differing bits_per_word, we bitwise-or the different values in the WLEN register field. Fix both of these. Also rename 'frame_length' to 'frame_len_words' to make clear that it's not a byte count like spi_message::frame_length. Signed-off-by: Ben Hutchings Signed-off-by: Mark Brown [bwh: Backported to 3.16: - QSPI_WLEN_MAX_BITS is not defined so use the literal value 128 - Adjust context] Signed-off-by: Ben Hutchings --- drivers/spi/spi-ti-qspi.c | 15 +++++++++------ 1 file changed, 9 insertions(+), 6 deletions(-) --- a/drivers/spi/spi-ti-qspi.c +++ b/drivers/spi/spi-ti-qspi.c @@ -91,6 +91,7 @@ struct ti_qspi { /* Command */ #define QSPI_EN_CS(n) (n << 28) #define QSPI_WLEN(n) ((n - 1) << 19) +#define QSPI_WLEN_MASK QSPI_WLEN(128) #define QSPI_3_PIN (1 << 18) #define QSPI_RD_SNGL (1 << 16) #define QSPI_WR_SNGL (2 << 16) @@ -322,7 +323,7 @@ static int ti_qspi_start_transfer_one(st struct spi_device *spi = m->spi; struct spi_transfer *t; int status = 0, ret; - int frame_length; + unsigned int frame_len_words; /* setup device control reg */ qspi->dc = 0; @@ -334,14 +335,15 @@ static int ti_qspi_start_transfer_one(st if (spi->mode & SPI_CS_HIGH) qspi->dc |= QSPI_CSPOL(spi->chip_select); - frame_length = (m->frame_length << 3) / spi->bits_per_word; - - frame_length = clamp(frame_length, 0, QSPI_FRAME); + frame_len_words = 0; + list_for_each_entry(t, &m->transfers, transfer_list) + frame_len_words += t->len / (t->bits_per_word >> 3); + frame_len_words = min_t(unsigned int, frame_len_words, QSPI_FRAME); /* setup command reg */ qspi->cmd = 0; qspi->cmd |= QSPI_EN_CS(spi->chip_select); - qspi->cmd |= QSPI_FLEN(frame_length); + qspi->cmd |= QSPI_FLEN(frame_len_words); qspi->cmd |= QSPI_WC_CMD_INT_EN; ti_qspi_write(qspi, QSPI_WC_INT_EN, QSPI_INTR_ENABLE_SET_REG); @@ -350,7 +352,8 @@ static int ti_qspi_start_transfer_one(st mutex_lock(&qspi->list_lock); list_for_each_entry(t, &m->transfers, transfer_list) { - qspi->cmd |= QSPI_WLEN(t->bits_per_word); + qspi->cmd = ((qspi->cmd & ~QSPI_WLEN_MASK) | + QSPI_WLEN(t->bits_per_word)); ret = qspi_transfer_msg(qspi, t); if (ret) {